WO2018225539A1 - 非水電解質電池用バインダー組成物、並びにそれを用いた非水電解質電池用バインダー水溶液、非水電解質電池用スラリー組成物、非水電解質電池用電極、及び非水電解質電池 - Google Patents
非水電解質電池用バインダー組成物、並びにそれを用いた非水電解質電池用バインダー水溶液、非水電解質電池用スラリー組成物、非水電解質電池用電極、及び非水電解質電池 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F261/00—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00
- C08F261/02—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols
- C08F261/04—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols on to polymers of vinyl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/12—Hydrolysis
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/06—Copolymers of allyl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F216/04—Acyclic compounds
- C08F216/06—Polyvinyl alcohol ; Vinyl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
- C08F218/02—Esters of monocarboxylic acids
- C08F218/04—Vinyl esters
- C08F218/08—Vinyl acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
- C08F2800/10—Copolymer characterised by the proportions of the comonomers expressed as molar percentages
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/50—Chemical modification of a polymer wherein the polymer is a copolymer and the modification is taking place only on one or more of the monomers present in minority
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a binder composition for a nonaqueous electrolyte battery, a binder aqueous solution for a nonaqueous electrolyte battery, a slurry composition for a nonaqueous electrolyte battery, a nonaqueous electrolyte battery electrode, and a nonaqueous electrolyte battery using the binder composition.
- Lithium ion secondary batteries are frequently used as secondary batteries used for the power sources of these portable terminals. Since portable terminals are required to have more comfortable portability, miniaturization, thinning, weight reduction, and high performance have rapidly progressed, and have come to be used in various places. This trend continues today, and batteries used in mobile terminals are further required to be smaller, thinner, lighter, and higher in performance.
- a non-aqueous electrolyte battery such as a lithium ion secondary battery has a positive electrode and a negative electrode installed via a separator, and LiPF 6 , LiBF 4 LiTFSI (lithium (bistrifluoromethylsulfonylimide)), LiFSI (lithium (bisfluorosulfonylimide). )) And a lithium salt dissolved in an organic liquid such as ethylene carbonate in a container.
- the above negative electrode and positive electrode are usually for electrodes obtained by dissolving or dispersing a binder and a thickener in water or a solvent and mixing this with an active material and, if necessary, a conductive additive (conductivity imparting agent).
- a slurry (hereinafter sometimes simply referred to as a slurry) is applied to a current collector, and water or a solvent is dried to form a mixed layer so as to be bound.
- a carbonaceous material capable of occluding and releasing lithium ions which is an active material, and, if necessary, acetylene black, a conductive auxiliary agent, are secondary to a current collector such as copper.
- LiCoO 2 that is an active material and, if necessary, a conductive aid similar to that of the negative electrode are bound to a current collector such as aluminum using a secondary battery electrode binder. Is.
- the most industrially used binder for aqueous media is a system in which carboxymethylcellulose sodium salt (CMC-Na) is added as a thickener to a diene rubber such as styrene-butadiene rubber (SBR).
- CMC-Na carboxymethylcellulose sodium salt
- SBR styrene-butadiene rubber
- diene rubbers such as styrene-butadiene rubber have low adhesion to metal collectors such as copper, and there is a problem that the amount used cannot be reduced to increase the adhesion between the collector and the electrode material.
- the capacity maintenance rate is low due to weakness against heat generated during charging and discharging.
- it since it is a two-component system, it has problems in manufacturing such as low storage stability and complicated slurry preparation process.
- an acrylic binder such as polyacrylic acid (for example, Patent Document 2), a polyamide / imide-based binder (for example, Patent Document 3), or a polyvinyl alcohol-based binder (for example, Patent Document 4) has been developed.
- Acrylic binders are excellent in that they exhibit high adhesion and have low swellability to electrolytes. On the other hand, there is a problem that the electric resistance is high, the flexibility is poor, and the electrode is easily broken. As for flexibility, for example, Patent Document 5 discloses that a nitrile group is introduced and improved, but the electric resistance still tends to be high.
- polyamide / imide binders also exhibit high adhesion, and are particularly excellent in electrical, thermal stability, and mechanical strength.
- the problem is that, like acrylic binders, the electrical resistance is high, the flexibility is poor and the electrode is easily cracked, but the mechanical strength is utilized to accompany the insertion and desorption of lithium ions during charging and discharging.
- An example of supplementing flexibility by using a metal oxide having a large expansion and contraction of an electrode as a negative electrode active material has been reported (for example, Patent Document 6).
- Patent Document 6 An example of supplementing flexibility by using a metal oxide having a large expansion and contraction of an electrode as a negative electrode active material has been reported (for example, Patent Document 6).
- Patent Document 6 An example of supplementing flexibility by using a metal oxide having a large expansion and contraction of an electrode as a negative electrode active material has been reported (for example, Patent Document 6).
- Patent Document 6 the combination of polyamide / imide binder and metal oxide has not fully solved the problems of high resistance and poor flexibility, and the polyamide
- polyvinyl alcohol binders also exhibit high adhesiveness and are industrially excellent because the raw material resin is inexpensive, but there is a problem that the slurry stability is low because of high resistance and active material aggregation.
- a general-purpose dispersant such as cellulose derivatives or a thixotropic property imparting agent for the purpose of increasing the viscosity of a binder using a thickener has been reported (for example, Patent Document 7, 8).
- Patent Document 7, 8 the problem of high resistance has not been solved.
- the present invention has been made in view of the above problems, and provides a polyvinyl alcohol-based binder composition that is highly adhesive but excellent in slurry stability and excellent in low resistance, and is a battery in a non-aqueous electrolyte battery.
- the purpose is to improve characteristics (high efficiency).
- the present inventors have found that the above object can be achieved by using a binder composition for a nonaqueous electrolyte battery having the following constitution, and further studies are made based on this finding.
- the present invention was completed by overlapping.
- the binder composition for a nonaqueous electrolyte battery according to one aspect of the present invention includes (A) polyvinyl alcohol, (B) a copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid. And at least one selected from polymers and neutralized salts thereof, and (C) at least one selected from amino acids, carboxylic acid-containing polymers, and polyamines.
- the binder composition for a non-aqueous electrolyte battery includes the following (A), (B), and (C): (A) polyvinyl alcohol, (B) at least one selected from copolymers of vinyl alcohol and ethylenically unsaturated carboxylic acids and neutralized salts thereof; and (C) at least selected from amino acids, carboxylic acid-containing polymers, and polyamines.
- A polyvinyl alcohol
- B at least one selected from copolymers of vinyl alcohol and ethylenically unsaturated carboxylic acids and neutralized salts thereof
- C at least selected from amino acids, carboxylic acid-containing polymers, and polyamines.
- the content of polyvinyl alcohol as component (A) in the binder composition of the present embodiment is not particularly limited, but is preferably 50% by weight or less, and 40% by weight or less. Is more preferable, and it is still more preferable that it is 30 weight% or less. Further, the lower limit of the content of the polyvinyl alcohol is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, and further preferably 1% by weight or more. When the content of the component (A) exceeds 50% by weight, electrical resistance may increase and high charge / discharge efficiency may not be obtained. When the content is less than 0.1% by weight, the slurry stability may deteriorate. There is.
- polyvinyl alcohol as component (A), it is possible to expect the effect that the cohesiveness of the binder due to the hydroxyl group and the affinity with the collector electrode are increased and the adhesiveness is improved. Moreover, by mixing different polymers, the molecular weight distribution is apparently broadened, and the crystallinity of the polymer is further lowered, so that an effect of improving flexibility can be expected. In addition, an effect of improving the slurry stability can be expected by suppressing aggregation of a single polymer by intermolecular interaction with a different polymer.
- the saponification degree of polyvinyl alcohol is not particularly limited, and is usually 50 mol% or more, more preferably 80 mol% or more, and further preferably 95 mol% or more.
- the degree of saponification is low, it is not preferable because the alkali metal contained in the binder composition may be hydrolyzed and stability may not be determined.
- the ethylenically unsaturated carboxylic acid constituting the component (B) is, for example, ethylenically unsaturated monocarboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, fumaric acid, itaconic acid, maleic acid, etc. And ethylenically unsaturated dicarboxylic acids.
- acrylic acid, methacrylic acid, and maleic acid are particularly preferable from the viewpoints of availability, polysynthesis, and product stability.
- These ethylenically unsaturated carboxylic acids may be used individually by 1 type, and may be used in combination of 2 or more type.
- the content ratio of vinyl alcohol and ethylenically unsaturated carboxylic acid in the copolymer of component (B) of this embodiment is preferably in the range of 100/1 to 1/100 in terms of molar ratio. This is because the advantages of hydrophilicity, water solubility, and affinity for metals and ions as a high molecular weight substance that dissolves in water can be obtained. When there is too little ethylenically unsaturated carboxylic acid, adhesiveness and a softness
- the copolymerization form is not particularly limited, and random copolymerization , Alternating copolymerization, block copolymerization, graft copolymerization and the like.
- block copolymerization and graft copolymerization in which vinyl alcohol is regularly arranged are preferable.
- the method for producing the copolymer of the present embodiment is not particularly limited, and any polymerization initiation method such as anionic polymerization, cationic polymerization, or radical polymerization may be used.
- the polymer production method may be solution polymerization. Any method such as bulk polymerization, suspension polymerization, dispersion polymerization, or emulsion polymerization may be used.
- the amount of the ethylenically unsaturated carboxylic acid modification is 0.1 It is preferably about ⁇ 60 mol%. Thereby, there exists an advantage that toughness and low resistance can be provided.
- a more preferable modification amount of the ethylenically unsaturated carboxylic acid is about 1 to 40 mol%.
- the amount of ethylenically unsaturated carboxylic acid modification in this embodiment can be quantified by, for example, nuclear magnetic resonance spectroscopy (NMR).
- the amount of the ethylenically unsaturated carboxylic acid modification is preferably less than 20 mol%, more preferably less than 15 mol%. From the viewpoint of improving low resistance, it is also a preferred embodiment that the amount of modification with the ethylenically unsaturated carboxylic acid is 11 mol% or more.
- the average molecular weight of the copolymer which is the component (B) of this embodiment is preferably 5,000 to 250,000 in terms of number average molecular weight.
- the number average molecular weight of the copolymer is less than 5,000, the mechanical strength of the binder may be lowered. Further, the number average molecular weight is more preferably 10,000 or more, and further preferably 15,000 or more.
- the number average molecular weight of the copolymer exceeds 250,000, the viscosity stability of the slurry composition for non-aqueous electrolyte batteries is reduced, and the handling properties are insufficient, such as causing the aggregation of the slurry. There is a fear.
- the number average molecular weight is more preferably 200,000 or less, and further preferably 150,000 or less.
- the number average molecular weight of the copolymer in the present invention means a value measured by a gel permeation chromatography (GPC) method using polyethylene oxide and polyethylene glycol as standard substances and an aqueous column as a column.
- GPC gel permeation chromatography
- the neutralized salt of a copolymer is a neutralized product by reacting an active hydrogen of carbonyl acid generated from an ethylenically unsaturated carboxylic acid with a basic substance to form a salt. It is preferable.
- a monovalent metal is used as the basic substance from the viewpoint of binding properties as a binder. It is preferable to use a basic substance containing and / or ammonia.
- Examples of basic substances containing monovalent metals that can be used in the present embodiment include hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; alkali metals such as sodium carbonate and potassium carbonate. Carbonates of alkali metals such as sodium acetate and potassium acetate; phosphates of alkali metals such as trisodium phosphate, and the like.
- ammonia, lithium hydroxide, sodium hydroxide, and potassium hydroxide are preferable.
- ammonia or lithium hydroxide as a binder for a lithium ion secondary battery.
- the basic substance containing monovalent metal and / or ammonia may be used alone or in combination of two or more.
- a neutralized product may be prepared by using a basic substance containing an alkali metal hydroxide such as sodium hydroxide as long as the battery performance is not adversely affected.
- the degree of neutralization is not particularly limited, but when used as a binder, considering the reactivity with the electrolytic solution, it is usually 0. It is preferably in the range of 1 to 1 equivalent, and more preferably neutralized in the range of 0.3 to 1 equivalent. Such a neutralization degree has the advantage of low acidity and suppression of electrolyte decomposition.
- the determination method of the degree of neutralization can use methods such as titration with a base, infrared spectrum, NMR spectrum, etc.
- titration with a base is used.
- the specific titration method is not particularly limited, but it can be dissolved in water with little impurities such as ion-exchanged water, and a basic substance such as lithium hydroxide, sodium hydroxide, potassium hydroxide, It can be carried out by neutralization.
- the indicator for the neutralization point is not particularly limited, but an indicator such as phenolphthalein whose pH is indicated by a base can be used.
- the usage amount of the basic substance containing monovalent metal and / or ammonia is not particularly limited and is appropriately selected depending on the purpose of use, etc., but is usually an ethylenically unsaturated carboxylic acid unit.
- the amount is preferably 0.1 to 1 equivalent to the amount.
- the amount of the basic substance containing a monovalent metal is preferably 0.3 to 1.0 equivalent, more preferably 0.4 to 1.0, based on the maleic acid unit in the maleic acid copolymer. When the amount is equivalent, a water-soluble copolymer salt with little alkali residue can be obtained.
- reaction of (B) vinyl alcohol with an ethylenically unsaturated carboxylic acid copolymer and / or a neutralized salt thereof can be carried out according to a conventional method.
- the method obtained as an aqueous solution is simple and preferable.
- the content of vinyl alcohol and ethylenically unsaturated carboxylic acid copolymer and / or neutralized salt thereof as component (B) is not particularly limited, It is preferably 99.9% by weight or less, more preferably 99.5% by weight or less, and still more preferably 99% by weight or less.
- the lower limit of the content is preferably 50% by weight or more, more preferably 60% by weight or more, still more preferably 70% by weight or more, and more preferably 80% by weight or more. Particularly preferred.
- the content of the component (B) exceeds 99.9% by weight, the slurry stability may be deteriorated.
- the electrical resistance increases and high charge / discharge efficiency cannot be obtained. There is.
- the amino group and / or carboxyl group of the component (C) of this embodiment is the hydroxyl group and carboxyl group of the components (A) and (B). It is considered that capping has an effect of stabilizing the slurry. In addition, there is no thickening effect by (C) component addition, and it is completely different from the additive aiming at the slurry stability by gelatinization or high viscosity.
- the component (C) is at least one selected from amino acids, carboxylic acid-containing polymers, and polyamines.
- the amino acid constituting the component (C) is not particularly limited.
- the content ratio of all carboxy groups to all amino groups in amino acids is preferably more than 0.1, preferably 0.5 or more, and 0.8 or more More preferably, it is more preferably 1.0 or more.
- the content ratio is preferably 10.0 or less, more preferably 7.0 or less, and even more preferably 6.0 or less.
- the amino acid in this embodiment is preferably not a high molecular weight substance.
- the molecular weight of the amino acid is usually preferably less than 500, more preferably less than 400, and even more preferably less than 300.
- the molecular weight of an amino acid is usually 50 or more.
- aspartic acid, glutamic acid, lysine with many amino group units, etc. which have a large number of carboxyl group units, are particularly preferred because they are expected to be highly effective.
- hydrophobic amino acids such as alanine and valine can be preferably used.
- glycine, aspartic acid, glutamic acid and the like are preferable from the viewpoint of availability and price.
- the carboxylic acid-containing polymer constituting the component (C) is not particularly limited.
- unsaturated monocarboxylic acid acrylic acid, methacrylic acid, crotonic acid, cinnamic acid, ⁇ -cyanocinnamic acid , ⁇ -styrylacrylic acid, ⁇ -furfurylacrylic acid and the like homopolymers and copolymers
- unsaturated dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid, mesaconic acid, 2-pentenic acid, methylene Homopolymers and copolymers having succinic acid, allylmalonic acid, isopropylidene succinic acid, 2,4-hexadienic acid, acetylenedicarboxylic acid as the main skeleton, natural products such as humic acid, fulvic acid, glycine, lysine, etc.
- the carboxylic acid-containing polymer used in the present embodiment interacts with the carboxylic acid and amino group in the carboxylic acid-containing polymer, and the capping effect on the components (A) and (B) decreases. It is preferable not to contain an amino group because there is a concern that it is difficult to contribute to the stabilization of the slurry.
- the copolymer (B) of vinyl alcohol and ethylenically unsaturated carboxylic acid and the neutralized salt thereof described above do not correspond to the carboxylic acid-containing polymer that is the component (C) of this embodiment. Should. That is, the (B) copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid and its neutralized salt are excluded from the carboxylic acid-containing polymer that is the component (C) of this embodiment.
- a copolymer unit having more carboxyl groups is considered to have a higher capping effect, so that a copolymer containing maleic acid, for example, a maleic acid-acrylic acid copolymer, More preferred examples include an isobutene-maleic acid copolymer and a neutralized salt.
- maleic acid gradually dehydrates and closes when it reaches a certain high temperature (80 ° C. or higher). Therefore, when the electrode is dried, the ring is closed, and the capping with the hydroxyl group of the polyvinyl alcohol as the component (A) is removed, so that it is considered that the hydroxyl group responsible for adhesion to the collector electrode is increased. It is also expected that the adhesion will be higher.
- polyacrylic acid, humic acid and the like can be preferably used from the viewpoint of availability.
- the polyamines constituting the component (C) are not particularly limited, and examples thereof include amino group-containing polymers, and preferred specific examples thereof include, for example, polyethyleneimine, polytetramethyleneimine, Examples thereof include polyvinylamine, polyallylamine, polydiallylamine and copolymers containing them, dicyandiamide-formalin condensate, and dicyandiamide-alkylene (polyamine) condensate. These may be used alone or in combination.
- the polyamines used in this embodiment are preferably compounds that do not contain a carboxy group. When it contains a carboxy group, the content ratio of all carboxy groups to all amino groups (total carboxy groups / total amino groups; molar ratio) is preferably 0.1 or less, and preferably 0.01 or less. Preferred (0 if not contained).
- polyamines of the present embodiment are preferably those that dissolve in a solution having a pH of less than 10.
- an amino group-containing polymer containing a primary amine is preferable.
- use of polyallylamine and polyethyleneimine is preferable.
- the composition ratio of the component (A) and the component (B) is preferably about 0.1: 99.9 to 50:50 in terms of solid content weight ratio. More preferably, it is about 1:99 to 40:60. Further, from the viewpoint of obtaining low resistance, the composition ratio of the component (A) and the component (B) is preferably 1:99 to 30:70, and is about 1:99 to 20:80. More preferably.
- the component (C) is preferably 0.02 to 5% by weight in terms of solid content with respect to the component (A). More preferably, it is about 0.05 to 3% by weight.
- the component (C) is preferably 0.05 to 10% by weight in solid content with respect to the total amount of the components (A) and (B). More preferably, it is about 0.1 to 6% by weight. If the amount of the component (C) is too small, the slurry stability cannot be obtained, and if it is too large, the electrical resistance may be obtained and high charge / discharge efficiency may not be obtained.
- the component (C) can be added simultaneously with the reaction of a basic substance containing a monovalent metal to obtain the component (B), or the component (B) and the monovalent metal. It can also be added after reacting a basic substance containing.
- the binder composition of this embodiment is usually used as a binder aqueous solution for a non-aqueous electrolyte battery comprising the above-described binder composition and water.
- the binder composition for a nonaqueous electrolyte battery of the present embodiment is usually a slurry composition for a nonaqueous electrolyte battery (hereinafter simply referred to as a slurry composition), which further contains an active material and water in addition to the binder composition described above. (Also referred to as). That is, the slurry composition of this embodiment contains the binder composition of this embodiment mentioned above, an active material, and water.
- the electrode for a nonaqueous electrolyte battery is characterized in that a mixed layer containing at least the binder composition of the present embodiment and an active material is bound to a current collector.
- This electrode can be formed by applying the slurry composition described above to a current collector and then removing the solvent by a method such as drying. If necessary, a thickener, a conductive aid and the like can be added to the mixed layer.
- the amount of the binder composition used is usually preferably 0.1 to 15% by weight, more preferably 0.00. 5 to 10% by weight, more preferably 1 to 8% by weight. If the amount of the binder composition is excessively small, the viscosity of the slurry is too low and the thickness of the mixed layer may be reduced. If the amount of the binder composition is excessively large, the discharge capacity may be reduced.
- the amount of water in the slurry composition is usually preferably 30 to 150% by weight, more preferably 70 to 120% by weight, where the weight of the active material is 100.
- the solvent in the slurry composition of the present embodiment in addition to the above water, for example, alcohols such as methanol, ethanol, propanol and 2-propanol, cyclic ethers such as tetrahydrofuran and 1,4-dioxane, N, N— Amides such as dimethylformamide and N, N-dimethylacetamide, cyclic amides such as N-methylpyrrolidone and N-ethylpyrrolidone, and sulfoxides such as dimethylsulfoxide can also be used. In these, use of water is preferable from a viewpoint of safety.
- the following organic solvent may be used in combination within a range of preferably 20% by weight or less of the entire solvent.
- Such an organic solvent preferably has a boiling point at normal pressure of 100 ° C. or higher and 300 ° C. or lower, for example, hydrocarbons such as n-dodecane; alcohols such as 2-ethyl-1-hexanol and 1-nonanol.
- Esters such as ⁇ -butyrolactone and methyl lactate; amides such as N-methylpyrrolidone, N, N-dimethylacetamide and dimethylformamide; and organic dispersion media such as sulfoxides and sulfones such as dimethyl sulfoxide and sulfolane.
- examples of the negative electrode active material added to the slurry composition include amorphous carbon, graphite, natural graphite, mesocarbon microbeads (MCMB), pitch-based carbon fibers, and the like.
- Carbonaceous materials; conductive polymers such as polyacene; composite metal oxides represented by SiO x , SnO x , LiTiO x and other metal oxides, lithium metals such as lithium metals and lithium alloys; TiS 2 , and metal compounds such as LiTiS 2 are exemplified.
- examples of the positive electrode active material added to the slurry composition include lithium iron phosphate (LiFePO 4 ), lithium manganese phosphate (LiMnPO 4 ), and phosphoric acid.
- a thickener can be further added to the slurry composition as necessary.
- the thickener that can be added is not particularly limited, and various alcohols, unsaturated carboxylic acids and modified products thereof, ⁇ -olefin-maleic acids and modified products thereof, celluloses, starches and other polysaccharides can be used. Can be used.
- the amount of the thickener used as necessary in the slurry composition is preferably about 0.1 to 4% by weight, more preferably 0.3 to 4% when the weight of the active material is 100. It is 3% by weight, more preferably 0.5 to 2% by weight. If the thickener is too small, the viscosity of the secondary battery negative electrode slurry may be too low and the thickness of the mixed layer may be reduced. Conversely, if the thickener is excessively large, the discharge capacity may be reduced. .
- examples of the conductive auxiliary compounded in the slurry composition as necessary include metal powder, conductive polymer, acetylene black, and the like.
- the amount of the conductive aid used is usually preferably 0.1 to 10% by weight, more preferably 0.8 to 7% by weight when the weight of the active material is 100.
- the electrode for a nonaqueous electrolyte battery is characterized in that a mixed layer containing at least the binder composition of the present embodiment and an active material is bound to a current collector.
- the current collector used for the nonaqueous electrolyte battery negative electrode of the present embodiment is not particularly limited as long as it is made of a conductive material.
- a conductive material For example, iron, copper, aluminum, nickel, stainless steel, titanium, tantalum, gold Metal materials such as platinum can be used. One of these may be used alone, or two or more of these may be used in combination at any ratio.
- the effect of the nonaqueous electrolyte battery negative electrode slurry of the present invention is most apparent. This is because the negative electrode having high affinity between the binder composition of the present embodiment and the copper foil can be produced.
- the shape of the current collector is not particularly limited, but usually it is preferably a sheet having a thickness of about 0.001 to 0.5 mm.
- the effect of the non-aqueous electrolyte battery negative electrode slurry of the present invention is most apparent. This is because the negative electrode having high affinity with the binder composition of the present embodiment and a certain non-nium foil can be produced.
- the shape of the current collector is not particularly limited, but usually it is preferably a sheet having a thickness of about 0.001 to 0.5 mm.
- the method for applying the slurry to the current collector is not particularly limited. Examples thereof include a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, a dipping method, and a brush coating method.
- the amount to be applied is not particularly limited, but the thickness of the mixed layer containing the active material, conductive additive, binder and thickener formed after removing the solvent or dispersion medium by a method such as drying is preferably 0.005 to An amount of 5 mm, more preferably 0.01 to 2 mm is common.
- the method for drying a solvent such as water contained in the slurry composition is not particularly limited, and examples thereof include aeration drying with hot air, hot air, and low-humidity air; vacuum drying; .
- the drying conditions are preferably adjusted so that the solvent can be removed as soon as possible while the active material layer is cracked by stress concentration or the active material layer does not peel from the current collector.
- the pressing method include a die press and a roll press.
- the present invention also includes a nonaqueous electrolyte battery having the above electrode.
- the nonaqueous electrolyte battery usually includes a negative electrode, a positive electrode, and an electrolytic solution.
- nonaqueous electrolyte battery in the present embodiment examples include a lithium ion battery, a sodium ion battery, a lithium sulfur battery, and an all solid state battery.
- the negative electrode that is normally used for nonaqueous electrolyte batteries such as lithium ion secondary batteries is used without particular limitation.
- graphite, hard carbon, Si-based oxide, etc. are used as the negative electrode active material.
- the negative electrode active material is composed of the above-mentioned conductive additive and a binder such as SBR, NBR, acrylic rubber, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinylidene fluoride, and the boiling point at 100 ° C.
- a negative electrode slurry prepared by mixing in a solvent at a temperature of 0 ° C. or lower can be applied to a negative electrode current collector such as a copper foil, and the solvent can be dried to obtain a negative electrode.
- the positive electrode normally used for nonaqueous electrolyte batteries such as a lithium ion secondary battery
- the positive electrode active material TiS 2 , TiS 3 , amorphous MoS 3 , Cu 2 V 2 O 3 , amorphous V 2 O—P 2 O 5 , MoO 3 , V 2 O 5 , V 6 O Transition metal oxides such as 13 and lithium-containing composite metal oxides such as LiCoO 2 , LiNiO 2 , LiMnO 2 , and LiMn 2 O 4 are used.
- the positive electrode active material is composed of the above-described conductive additive and a binder such as SBR, NBR, acrylic rubber, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinylidene fluoride, and the boiling point at 100 ° C.
- a binder such as SBR, NBR, acrylic rubber, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinylidene fluoride, and the boiling point at 100 ° C.
- the positive electrode slurry prepared by mixing in a solvent at a temperature of 0 ° C. or lower can be applied to a positive electrode current collector such as aluminum and the solvent can be dried to obtain a positive electrode.
- an electrode containing the binder composition of the present embodiment can be used for both the positive electrode and the negative electrode.
- an electrolytic solution in which an electrolyte is dissolved in a solvent can be used.
- the electrolyte solution may be liquid or gel as long as it is used for a non-aqueous electrolyte battery such as a normal lithium ion secondary battery, and functions as a battery depending on the type of the negative electrode active material and the positive electrode active material. What is necessary is just to select suitably.
- lithium salt for example, also known lithium salt is any conventionally available, LiClO 4, LiBF 6, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiB 10 Cl 10 , LiAlCl 4 , LiCl, LiBr, LiB (C 2 H 5 ) 4 , CF 3 SO 3 Li, CH 3 SO 3 Li, LiCF 3 SO 3 , LiC 4 F 9 SO 3 , Li (CF 3 SO 2 ) 2 N And lower aliphatic lithium carboxylates.
- the solvent for dissolving such an electrolyte is not particularly limited. Specific examples include carbonates such as propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, and diethyl carbonate; lactones such as ⁇ -butyllactone; trimethoxymethane, 1,2-dimethoxyethane, diethyl ether, and 2-ethoxyethane.
- Ethers such as tetrahydrofuran, 2-methyltetrahydrofuran; sulfoxides such as dimethyl sulfoxide; oxolanes such as 1,3-dioxolane, 4-methyl-1,3-dioxolane; nitrogen-containing compounds such as acetonitrile and nitromethane; formic acid Organic acid esters such as methyl, methyl acetate, ethyl acetate, butyl acetate, methyl propionate and ethyl propionate; inorganic acid esters such as triethyl phosphate, dimethyl carbonate and diethyl carbonate Terigres; diglymes; triglymes; sulfolanes; oxazolidinones such as 3-methyl-2-oxazolidinone; sultones such as 1,3-propane sultone, 1,4-butane sultone, naphtha sultone, etc.
- a gel electrolyte a nitrile polymer, an acrylic polymer, a fluorine polymer, an alkylene oxide polymer, or the like can be added as a gelling agent.
- the method for producing the non-aqueous electrolyte battery of the present embodiment is not particularly limited, and for example, the following production method is exemplified. That is, the negative electrode and the positive electrode are overlapped with each other via a separator such as a polypropylene porous membrane, wound or folded according to the shape of the battery, put into a battery container, injected with an electrolyte, and sealed.
- the shape of the battery may be any known coin type, button type, sheet type, cylindrical type, square type, flat type, and the like.
- the nonaqueous electrolyte battery of the present embodiment is a battery that achieves both improved adhesion and improved battery characteristics, and is useful for various applications.
- the battery is very useful as a battery used in a portable terminal that is required to be small, thin, light, and have high performance.
- the binder composition for a nonaqueous electrolyte battery according to one aspect of the present invention includes (A) polyvinyl alcohol, (B) a copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid. And at least one selected from a polymer and a neutralized salt thereof, and (C) at least one selected from amino acids, carboxylic acid-containing polymers, and polyamines.
- At least one selected from the (B) copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid and a neutralized salt thereof is in the form of block copolymer. Copolymerization is preferred. Thereby, it is considered that higher adhesiveness can be obtained.
- At least one selected from the (B) copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid and a neutralized salt thereof is copolymerized in the form of graft copolymerization.
- the ethylenically unsaturated carboxylic acid in at least one selected from (B) a copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid and a neutralized salt thereof.
- the acid modification amount is preferably 0.1 to 60 mol%.
- the content of the component (B) in the binder composition is preferably 50.0 to 99.9% by weight. Thereby, it is considered that slurry stability and higher charge / discharge efficiency can be obtained.
- the component (C) includes a carboxylic acid-containing polymer, and the carboxylic acid polymer is a maleic acid-acrylic acid copolymer or isobutene-maleic acid. It is preferably at least one selected from the group consisting of copolymers and neutralized salts thereof. Thereby, it is considered that the stability of the obtained slurry is further increased.
- the component (C) preferably includes a polyamine.
- a binder aqueous solution for a nonaqueous electrolyte battery according to still another aspect of the present invention is characterized by containing the binder composition and water.
- a slurry composition for a non-aqueous electrolyte battery according to still another aspect of the present invention is characterized by containing the binder composition, an active material, and water.
- the electrode for a non-aqueous electrolyte battery according to still another aspect of the present invention is characterized in that a mixed layer containing the binder composition and the active material is bound to a current collector.
- a nonaqueous electrolyte battery according to still another aspect of the present invention has the above electrode for a nonaqueous electrolyte battery.
- Example 1 Test of binder composition using amino acid as component (C)]
- Example 1 ⁇ Synthesis of vinyl alcohol and ethylenically unsaturated carboxylic acid copolymer> 100 g of commercially available polyvinyl alcohol (manufactured by Kuraray Co., Ltd., 28-98s) was irradiated with an electron beam (30 kGy).
- 33.4 g of acrylic acid and 466.6 g of methanol were charged into a reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, and a particle addition port, and the inside of the system was purged with nitrogen for 30 minutes while bubbling nitrogen. .
- Lithium hydroxide was added in an amount of 0.5 equivalent to the carboxylic acid unit in the polymer to 100 g of the vinyl alcohol and acrylic acid copolymer 10% by weight aqueous solution obtained above, and heated and stirred at 80 ° C. for 2 hours. Cooled to room temperature.
- glycine manufactured by Wako Pure Chemical Industries, Ltd.
- Electrode slurry preparation is made of artificial graphite (FSN-1, manufactured by Sugisu, China) 96 as an active material for negative electrode. 3 parts by weight of a 10% by weight aqueous solution of the binder composition as a solid content and 1 part by weight of Super-P (made by Timcal) as a solid content as a conductive auxiliary agent (conductivity imparting agent) Put in a container, add water so that the slurry solids concentration is as shown in Table 1, knead using a planetary stirrer (ARE-250, manufactured by Shinky Corporation), and slurry for electrode coating Was made.
- ⁇ Slurry stability> In order to confirm the stability of the obtained slurry, the state of particle sedimentation immediately after slurry preparation was visually confirmed. As evaluation criteria, a slurry in which settling did not occur for 3 hours or more was evaluated as ⁇ , a slurry in which settling occurred in 3 hours to 30 minutes was ⁇ , and a slurry in which settling occurred within 30 minutes was evaluated as x. The results are shown in Table 1 below.
- the negative electrode for a battery obtained above was transferred to a glove box (manufactured by Miwa Seisakusho Co., Ltd.) under an argon gas atmosphere.
- a metal lithium foil (thickness 0.2 mm, ⁇ 16 mm) was used for the positive electrode.
- a polypropylene system (Celguard # 2400, manufactured by Polypore Corporation) is used as a separator, and the electrolyte is vinylene in ethylene carbonate (EC) and ethyl methyl carbonate (EMC) of lithium hexafluorophosphate (LiPF 6 ).
- the produced coin battery was subjected to a charge / discharge test using a commercially available charge / discharge tester (TOSCAT3100, manufactured by Toyo System Co., Ltd.).
- the coin battery is placed in a constant temperature bath at 25 ° C., and charging is performed with a constant current of 0.1 C (about 0.5 mA / cm 2 ) with respect to the amount of active material until the voltage reaches 0 V with respect to the lithium potential.
- the constant voltage charge of 0V was implemented to the electric current of 0.02 mA.
- the capacity at this time was defined as a charging capacity (mAh / g).
- Example 2 A binder aqueous solution was prepared in the same manner as in Example 1 except that 5% by weight of glycine was added as a solid content to the mixture of (A-1) and (B-1), and used as a binder composition. It was.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 5 Except for adding 0.2 equivalents of lithium hydroxide and 0.3 equivalents of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of a 10% by weight aqueous solution of vinyl alcohol and acrylic acid copolymer prepared in Example 1. Prepared a binder aqueous solution in the same manner as in Example 2 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 6 A binder aqueous solution was prepared in the same manner as in Example 2 except that the amino acid was L-glutamic acid (manufactured by Wako Pure Chemical Industries, Ltd.), and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 7 A binder aqueous solution was prepared in the same manner as in Example 2 except that the amino acid was L-aspartic acid (manufactured by Wako Pure Chemical Industries, Ltd.), and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 8 A binder aqueous solution was prepared in the same manner as in Example 2 except that the amino acid was L-lysine (manufactured by Wako Pure Chemical Industries, Ltd.), and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 10 100 g of commercially available polyvinyl alcohol (Elvanol 71-30, manufactured by Kuraray Co., Ltd.) was irradiated with an electron beam (30 kGy). Next, 25 g of methacrylic acid and 475 g of methanol were charged into a reactor equipped with a stirrer, a reflux condenser, a nitrogen introduction tube and a particle addition port, and the system was purged with nitrogen for 30 minutes while bubbling nitrogen. 100 g of polyvinyl alcohol irradiated with an electron beam was added thereto, and the mixture was stirred and heated under reflux for 300 minutes in a state where the particles were dispersed in the solution, and graft polymerization was performed.
- polyvinyl alcohol Elvanol 71-30, manufactured by Kuraray Co., Ltd.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- A-2 polyvinyl alcohol
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 12 A reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, and an initiator addition port was charged with 370 g of water and 100 g of commercially available polyvinyl alcohol (manufactured by Kuraray Co., Ltd., M115), and heated at 95 ° C. with stirring. After the polyvinyl alcohol was dissolved, it was cooled to room temperature. 0.5N (N) sulfuric acid was added to the aqueous solution to adjust the pH to 3.0. To this was added 9.9 g of acrylic acid with stirring, and then the mixture was heated to 70 ° C. while bubbling nitrogen into the aqueous solution, and further purged with nitrogen by bubbling nitrogen for 30 minutes while maintaining 70 ° C.
- N 0.5N
- aqueous potassium persulfate solution (concentration: 2.5% by weight) was added dropwise to the aqueous solution over 1.5 hours. After addition of the entire amount, the temperature was raised to 75 ° C., and the mixture was further stirred for 1 hour, and then cooled to room temperature. The obtained aqueous solution was poured onto a PET film and dried in hot air at 80 ° C. for 30 minutes to produce a film. The film was frozen with liquid nitrogen, pulverized using a centrifugal pulverizer, and further vacuum dried at 40 ° C. overnight to obtain the desired copolymer. The amount of ethylenic unsaturated carboxylic acid modification of the obtained copolymer was 6.0 mol%.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- A-1 commercially available polyvinyl alcohol
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 14 Except for adding 0.2 equivalents of lithium hydroxide and 0.3 equivalents of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of a 10% by weight aqueous solution of vinyl alcohol and acrylic acid copolymer prepared in Example 13. Prepared an aqueous binder solution in the same manner as in Example 13 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 15 A reactor equipped with a stirrer, reflux condenser, argon inlet, and initiator addition port was charged with 640 g of vinyl acetate, 240.4 g of methanol, and 0.88 g of acrylic acid, and nitrogen was bubbled through the system for 30 minutes. Replaced. Separately, a methanol solution of acrylic acid (concentration: 20% by weight) was prepared as a comonomer sequential addition solution (hereinafter referred to as a delay solution), and argon was bubbled for 30 minutes. The temperature of the reactor was increased, and when the internal temperature reached 60 ° C., 0.15 g of 2,2′-azobisisobutyronitrile was added to initiate polymerization.
- the prepared delay solution was dropped into the system so that the monomer composition (molar ratio of vinyl acetate and acrylic acid) in the polymerization solution became constant.
- the polymerization was stopped by cooling. Subsequently, unreacted monomers were removed while sometimes adding methanol under reduced pressure at 30 ° C. to obtain a methanol solution of polyvinyl acetate modified with acrylic acid.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 1 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 1 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 2 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 9 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 3 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 10 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 4 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 11 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 5 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 12 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 6 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 13 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 7 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 15 except that glycine was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 8 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 1 except that glycine and polyvinyl alcohol were not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 9 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 13 except that glycine and polyvinyl alcohol were not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 10 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 14 except that glycine and polyvinyl alcohol were not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 11 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 1 except that neutralized salt of vinyl alcohol and ethylenically unsaturated carboxylic acid copolymer and glycine were not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Example 12 A binder aqueous solution was prepared in the same manner as in Example 1 except that carboxymethylcellulose (Serogen BSH-6, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was added as a thickener instead of amino acid. Using. A slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 1 below.
- Comparative Examples 1 to 11 showed high charge / discharge efficiency, but on the other hand, the slurry stability was not sufficient as compared with the Examples.
- the conventional thickener shown in Comparative Example 12 was added, the adhesiveness, slurry stability, and charge / discharge efficiency were all lowered, so that improvement of these physical properties was achieved only with a simple thickening effect. It was also shown that it was not possible.
- Example 16 Test of binder composition using carboxylic acid-containing polymer as component (C)] (Example 16) Except that polyacrylic acid (manufactured by Aldrich Co., Ltd., molecular weight: 250,000) was added as a carboxylic acid-containing polymer to the mixture of (A-1) and (B-1) by 1 wt% as a solid content, A binder aqueous solution was prepared in the same manner as in Example 1 and used as a binder composition.
- polyacrylic acid manufactured by Aldrich Co., Ltd., molecular weight: 250,000
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 17 A binder aqueous solution was prepared in the same manner as in Example 16 except that polyacrylic acid was added to the mixture of (A-1) and (B-1) in an amount of 4% by weight as a solid content. Used as.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 20 Except for adding 0.2 equivalent of lithium hydroxide and 0.3 equivalent of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of the vinyl alcohol / acrylic acid copolymer 10% by weight aqueous solution prepared in Example 16. Prepared a binder aqueous solution in the same manner as in Example 17 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 21 A binder aqueous solution was prepared in the same manner as in Example 17 except that the carboxylic acid-containing polymer was a lithium-modified isobutene-maleic anhydride copolymer (neutralization degree 0.5, molecular weight: 300,000). And used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 22 A binder aqueous solution was prepared in the same manner as in Example 17 except that the carboxylic acid-containing polymer was poly (acrylic acid-maleic acid) (manufactured by Aldrich Corporation, molecular weight: 1,300). Used as.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- humic acid manufactured by Aldrich Co., Ltd.
- carboxylic acid-containing polymer was added to the mixture of (A-1) and (B-8) as a solid content by 0.01% by weight to prepare an aqueous binder solution. Used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 24 As a carboxylic acid-containing polymer, a lithium-modified isobutene-maleic anhydride copolymer (neutralization degree 0.5, molecular weight: 300,000) as a solid content with respect to the mixture of (A-2) and (B-3) A binder aqueous solution was prepared in the same manner as in Example 10 except that 4% by weight was added, and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 25 As a carboxylic acid-containing polymer, a lithium-modified isobutene-maleic anhydride copolymer (neutralization degree 0.5, molecular weight: 300,000) as a solid content with respect to the mixture of (A-2) and (B-4) A binder aqueous solution was prepared in the same manner as in Example 11 except that 4% by weight was added, and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 26 As a carboxylic acid-containing polymer, a lithium-modified isobutene-maleic anhydride copolymer (degree of neutralization 0.5, molecular weight: 250,000) as a solid content with respect to the mixture of (A-1) and (B-5) A binder aqueous solution was prepared in the same manner as in Example 12 except that 4% by weight was added, and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 27 As a carboxylic acid-containing polymer, a lithium-modified isobutene-maleic anhydride copolymer (neutralization degree 0.5, molecular weight: 300,000) as a solid content with respect to the mixture of (A-1) and (B-6) A binder aqueous solution was prepared in the same manner as in Example 13 except that 4% by weight was added, and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 28 Except for adding 0.2 equivalents of lithium hydroxide and 0.3 equivalents of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of a 10% by weight aqueous solution of vinyl alcohol and acrylic acid copolymer prepared in Example 27. Prepared a binder aqueous solution in the same manner as in Example 27 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 29 As a carboxylic acid-containing polymer, a lithium-modified isobutene-maleic anhydride copolymer (neutralization degree 0.5, molecular weight: 300,000) as a solid content with respect to the mixture of (A-1) and (B-7) A binder aqueous solution was prepared in the same manner as in Example 15 except that 4% by weight was added, and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Example 13 A binder aqueous solution was prepared and used as a binder composition in the same manner as in Example 23 except that humic acid was not added.
- a slurry for a non-aqueous electrolyte battery was prepared by the same method as in Example 1, and the slurry stability was confirmed.
- a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed.
- a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 2 below.
- Test of binder composition using polyamines as component (C) (Example 30) Except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-1) and (B-1) in an amount of 1.0% by weight as a solid content.
- a binder aqueous solution was prepared in the same manner as in Example 1 and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 33 Except for adding 0.2 equivalents of lithium hydroxide and 0.3 equivalents of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of a 10% by weight aqueous solution of vinyl alcohol and acrylic acid copolymer prepared in Example 1. Prepared an aqueous binder solution in the same manner as in Example 30 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 34 A binder aqueous solution was prepared in the same manner as in Example 30 except that polyallylamine (molecular weight 5,000, manufactured by Nitto Bo Medical Co., Ltd.) was used as the polyamine, and used as a binder composition.
- polyallylamine molecular weight 5,000, manufactured by Nitto Bo Medical Co., Ltd.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 35 A binder aqueous solution was prepared in the same manner as in Example 30 except that polydiallylamine (molecular weight 5,000, manufactured by Nitto Bo Medical Co., Ltd.) was used as a polyamine, and used as a binder composition.
- polydiallylamine molecular weight 5,000, manufactured by Nitto Bo Medical Co., Ltd.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 36 A binder aqueous solution was prepared in the same manner as in Example 30 except that polyethyleneimine (molecular weight 10,000, manufactured by Nitto Bo Medical Co., Ltd.) was used as a polyamine, and used as a binder composition.
- polyethyleneimine molecular weight 10,000, manufactured by Nitto Bo Medical Co., Ltd.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 37 The same as Example 9 except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-1) and (B-2) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared by the method described above and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 38 The same as Example 10 except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-2) and (B-3) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared by the method described above and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 39 The same as Example 11 except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-2) and (B-4) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared by the method described above and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 40 The same as Example 12 except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-1) and (B-5) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared by the method described above and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 41 A binder aqueous solution was prepared in the same manner as in Example 40 except that polyethyleneimine (molecular weight 1,600, manufactured by Nitteau Medical Co., Ltd.) was used as the polyamine, and used as a binder composition.
- polyethyleneimine molecular weight 1,600, manufactured by Nitteau Medical Co., Ltd.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 42 The same as Example 13 except that polyallylamine (molecular weight 1,600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-1) and (B-6) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared by the method described above and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 43 Except for adding 0.2 equivalents of lithium hydroxide and 0.3 equivalents of sodium hydroxide to the carboxylic acid unit in the polymer to 100 g of a 10% by weight aqueous solution of vinyl alcohol and acrylic acid copolymer prepared in Example 42. Prepared an aqueous binder solution in the same manner as in Example 42 and used it as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- Example 44 The same method as in Example 15 except that polyallylamine (molecular weight: 1600, manufactured by Nitto Bo Medical Co., Ltd.) was added as a polyamine to the mixture of (A-1) and (B-7) in an amount of 1% by weight as a solid content.
- a binder aqueous solution was prepared and used as a binder composition.
- a slurry for a non-aqueous electrolyte battery was prepared in the same manner as in Example 1 above, and the slurry stability was confirmed. Further, a battery coated negative electrode was prepared in the same manner as in Example 1 to obtain a coin battery, and a charge / discharge characteristic test was performed. Similarly, a peel strength coated electrode was produced in the same manner as in Example 1, and the peel strength was measured. The results are shown in Table 3 below.
- component (B) was coated with a powdered active material to form an ionic conductive layer, so that Li ions could easily move inside the battery. It is assumed that the component C) does not interfere with Li ion transport without forming a formed body such as a gel.
- the present invention has wide industrial applicability in the technical field related to non-aqueous electrolyte batteries such as lithium ion secondary batteries.
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Abstract
Description
(A)ポリビニルアルコール、
(B)ビニルアルコールとエチレン性不飽和カルボン酸との共重合体及びその中和塩から選択される少なくとも1つ、及び
(C)アミノ酸、カルボン酸含有高分子、およびポリアミン類から選択される少なくとも1つ。
(実施例1)
<ビニルアルコールとエチレン性不飽和カルボン酸共重合体の合成>
市販のポリビニルアルコール(株式会社クラレ製、28-98s)100gに電子線(30kGy)を照射した。次に、攪拌機、還流冷却管、窒素導入管及び粒子の添加口を備えた反応器に、アクリル酸33.4g、メタノール466.6gを仕込み、窒素バブリングをしながら30分間系内を窒素置換した。ここに電子線を照射したポリビニルアルコールを100g添加し、撹拌して粒子が溶液中に分散した状態で300分間加熱還流してグラフト重合を行った。その後、ろ別して粒子を回収し、40℃で終夜真空乾燥することにより、目的の共重合体を得た。得られた共重合体のエチレン性不飽和カルボン酸変性量は7.3モル%であった。
上記で得られたビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加し、80℃、2時間加熱撹拌し、その後、室温まで冷却した。
昭和電工株式会社製サイズ排除高速液体クロマトグラフィー装置「GPC-101」を用い、カラム:東ソー株式会社製水系カラム「TSKgel GMPWXL」を2本直列で接続、標準試料:ポリエチレンオキシド及びポリエチレングリコール、溶媒及び移動相:0.1mol/L硝酸ナトリウム水溶液、流量:0.7L/min、温度:25℃、検出器:RI、の条件で、一部のビニルアルコールとエチレン性不飽和カルボン酸共重合体の中和塩について数平均分子量を測定した。結果はそれぞれ表1~3に記載する。
上記で得られたビニルアルコールとエチレン性不飽和カルボン酸共重合体の中和塩の10重量%水溶液(B-1)に、市販のポリビニルアルコール(株式会社クラレ製、28-98s、けん化度:98)(A-1)を固形分として、重量比で(A-1):(B-1)=10:90となるように添加した。さらに、アミノ酸としてグリシン(和光純薬工業株式会社製)を(A-1)と(B-1)の混合物に対し、固形分として0.3重量%添加し、バインダー水溶液の調製を行った。
上記バインダー水溶液1gを熱風乾燥機にて105℃1時間乾燥して得られた固体を用い、熱分析計(ヤマト科学社製)を用いて示差走査熱量測定を行った。測定温度範囲50℃~1000℃、昇温速度10℃/分にて測定を行った。結果を下記表1に示す。
電極用スラリー作製は、負極用活物質として人造黒鉛(FSN-1、中国杉杉製)96
重量部に対して、前記バインダー組成物の10重量%水溶液を固形分として3重量部、および導電助剤(導電付与剤)としてSuper-P(ティムカル社製)を固形分として1重量部を専用容器に投入し、スラリー固形分濃度が表1に記載の濃度となるように水を添加して、遊星攪拌器(ARE-250、シンキー株式会社製)を用いて混練し、電極塗工用スラリーを作製した。スラリー中の活物質とバインダーの組成比は固形分として、黒鉛粉末:導電助剤:バインダー組成物=96:1:3(重量比)である。
得られたスラリーの安定性を確認するため、スラリー調製直後の粒子沈降の様子を目視で確認した。評価基準としては、3時間以上沈降が生じなかったスラリーを◎、3時間~30分で沈降が生じたスラリーを△、30分以内に沈降が生じたスラリーを×と判断した。結果を下記表1に示す。
得られた前記スラリーを、バーコーター(T101、松尾産業株式会社製)を用いて集電体の銅箔(CST8G、福田金属箔粉工業株式会社製)上に塗工し、80℃、30分、熱風乾燥機で一次乾燥後、ロールプレス(宝泉株式会社製)を用いて圧延処理を行なった。その後、電池用電極(φ14mm)として打ち抜き後、140℃で3時間減圧条件の二次乾燥によってコイン電池用電極を作製した。
得られた前記スラリーを、バーコーター(T101、松尾産業株式会社製)を用いて集電体の銅箔(CST8G、福田金属箔粉工業株式会社製)上に塗工し、80℃、30分、熱風乾燥機で一次乾燥後、ロールプレス(宝泉株式会社製)を用いて圧延処理を行なった電極(膜厚約35μm)を用いて試験を行った。
集電極である銅箔から前記剥離強度試験用電極を剥離したときの強度を測定した。当該剥離強度は、50Nのロードセル(株式会社イマダ製)を用いて180°剥離強度を測定した。上記で得られた電池用塗工電極のスラリー塗布面とステンレス板とを両面テープ(ニチバン製両面テープ)を用いて貼り合わせ、180°剥離強度(剥離幅10mm、剥離速度100mm/min)を測定した。上記結果を下記表1に示す。
上記で得られた電池用負極をアルゴンガス雰囲気下のグローブボックス(株式会社美和製作所製)に移送した。正極には金属リチウム箔(厚さ0.2mm、φ16mm)を用いた。また、セパレーターとしてポリプロフィレン系(セルガード#2400、ポリポア株式会社製)を使用して、電解液は六フッ化リン酸リチウム(LiPF6)のエチレンカーボネート(EC)とエチルメチルカーボネート(EMC)にビニレンカーボネート(VC)を添加した混合溶媒系(1M-LiPF6、EC/EMC=3/7vol%、VC2重量%)を用いて注入し、コイン電池(2032タイプ)を作製した。
作製したコイン電池は、市販充放電試験機(TOSCAT3100、東洋システム株式会社製)を用いて充放電試験を実施した。コイン電池を25℃の恒温槽に置き、充電はリチウム電位に対して0Vになるまで活物質量に対して0.1C(約0.5mA/cm2)の定電流充電を行い、更にリチウム電位に対して0.02mAの電流まで0Vの定電圧充電を実施した。このときの容量を充電容量(mAh/g)とした。次いで、リチウム電位に対して0.1C(約0.5mA/cm2)の定電流放電を1.5Vまで行い、このときの容量を放電容量(mAh/g)とした。初期放電容量と充電容量差を不可逆容量、放電容量/充電容量の百分率を充放電効率とした。上記結果を下記表1に示す。
グリシンを(A-1)と(B-1)の混合物に対し、固形分として5重量%添加したこと以外は、実施例1と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=35:65となるようにしたこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=45:55となるようにしたこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例1で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
アミノ酸をL-グルタミン酸(和光純薬工業株式会社製)にしたこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
アミノ酸をL-アスパラギン酸(和光純薬工業株式会社製)にしたこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
アミノ酸をL-リシン(和光純薬工業株式会社製)にしたこと以外は、実施例2と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
アクリル酸を100g、メタノールを400g添加したこと以外は実施例1と同様にして、目的の共重合体を合成した。得られた共重合体のエチレン性不飽和カルボン酸変性量は26.2モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-2)の調製を行った。その後、実施例1で用いた市販のポリビニルアルコール(A-1)を固形分として、重量比で(A-1):(B-2)=7:93となるように添加した。さらに、アミノ酸としてグリシンを(A-1)と(B-2)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
市販のポリビニルアルコール(株式会社クラレ製、Elvanol 71-30)100gに電子線(30kGy)を照射した。次に、攪拌機、還流冷却管、窒素導入管及び粒子の添加口を備えた反応器に、メタクリル酸25g、メタノール475gを仕込み、窒素バブリングをしながら30分間系内を窒素置換した。ここに電子線を照射したポリビニルアルコールを100g添加し、撹拌して粒子が溶液中に分散した状態で300分間加熱還流してグラフト重合を行った。その後、ろ別して粒子を回収し、40℃で終夜真空乾燥することにより、目的の共重合体を得た。得られた共重合体のエチレン性不飽和カルボン酸変性量は7.0モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-3)の調製を行った。その後、市販のポリビニルアルコール(株式会社クラレ製、Elvanol 71-30、けん化度:99)(A-2)を固形分として、重量比で(A-2):(B-3)=12:88となるように添加した。さらに、アミノ酸としてグリシンを(A-2)と(B-3)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
メタクリル酸を100g、メタノールを400g添加したこと以外は実施例10と同様にして、目的の共重合体を合成した。得られた共重合体のエチレン性不飽和カルボン酸変性量は34.0モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-4)の調製を行った。その後、実施例10と同様の市販のポリビニルアルコール(A-2)を固形分として、重量比で(A-2):(B-4)=5:95となるように添加した。さらに、アミノ酸としてグリシンを(A-2)と(B-4)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
攪拌機、還流冷却管、窒素導入管、開始剤の添加口を備えた反応器に、水370g、市販のポリビニルアルコール(株式会社クラレ製、M115)100gを仕込み、撹拌下95℃で加熱して該ポリビニルアルコールを溶解した後、室温まで冷却した。該水溶液に0.5規定(N)の硫酸を添加してpHを3.0にした。ここに、撹拌下アクリル酸9.9gを添加した後、該水溶液中に窒素をバブリングしながら70℃まで加温し、さらに70℃のまま30分窒素をバブリングして窒素置換した。窒素置換後、当該水溶液に過硫酸カリウム水溶液(濃度2.5重量%)80.7gを1.5時間かけて滴下した。全量添加後、75℃に昇温してさらに1時間撹拌した後、室温まで冷却した。得られた水溶液をPETフィルム上に流涎し、80℃で30分熱風乾燥することでフィルムを作製した。当該フィルムを液体窒素で凍結した後、遠心粉砕機を用いて粉砕し、さらに40℃で終夜真空乾燥することにより、目的の共重合体を得た。得られた共重合体のエチレン性不飽和カルボン酸変性量は6.0モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-5)の調製を行った。その後、実施例1と同様の市販のポリビニルアルコール(A-1)を固形分として、重量比で(A-1):(B-5)=10:90となるように添加した。さらに、アミノ酸としてグリシンを(A-1)と(B-5)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
アクリル酸を20g、過硫酸カリウム水溶液(濃度2.5重量%)150g添加したこと以外は実施例12と同様にして、目的の共重合体を合成した。得られた共重合体のエチレン性不飽和カルボン酸変性量は12.0モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-6)の調製を行った。その後、実施例1で用いた市販のポリビニルアルコール(A-1)を固形分として、重量比で(A-1):(B-6)=10:90となるように添加した。さらに、アミノ酸としてグリシンを(A-1)と(B-6)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例13で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例13と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
攪拌機、還流冷却管、アルゴン導入管、開始剤の添加口を備えた反応器に、酢酸ビニル640g、メタノール240.4g、アクリル酸0.88gを仕込み、窒素バブリングをしながら30分間系内を窒素置換した。これとは別に、コモノマーの逐次添加溶液(以降ディレー溶液と表記する)としてアクリル酸のメタノール溶液(濃度20重量%)を調製し、30分間アルゴンをバブリングした。反応器の昇温を開始し、内温が60℃となったところで、2,2’-アゾビスイソブチロニトリル0.15gを添加し重合を開始した。重合反応の進行中は、調製したディレー溶液を系内に滴下することで、重合溶液におけるモノマー組成(酢酸ビニルとアクリル酸のモル比率)が一定となるようにした。60℃で210分重合した後、冷却して重合を停止した。続いて、30℃、減圧下でメタノールを時々添加しながら未反応のモノマーの除去を行い、アクリル酸で変性されたポリ酢酸ビニルのメタノール溶液を得た。次に、当該ポリ酢酸ビニルのメタノール溶液にメタノールを追加して濃度を25重量%に調製したポリ酢酸ビニルのメタノール溶液400gに、20.4gの水酸化ナトリウムメタノール溶液(濃度18.0重量%)、メタノール79.6gを添加して、40℃でけん化を行った。水酸化ナトリウムメタノール溶液を添加後数分でゲル化物が生成したので、これを粉砕機にて粉砕し、40℃のまま60分間放置してけん化を進行させた。得られた粉砕ゲルをメタノールで繰り返し洗浄した後、40℃で終夜真空乾燥することにより、目的の共重合体を合成した。得られた共重合体のエチレン性不飽和カルボン酸変性量は5.0モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し0.5当量添加して、前記共重合体の中和塩(B-7)の調製を行った。その後、実施例1で用いた市販のポリビニルアルコール(A-1)を固形分として、重量比で(A-1):(B-7)=10:90となるように添加した。さらに、アミノ酸としてグリシンを(A-1)と(B-7)の混合物に対し、固形分として5重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
グリシンを添加しなかったこと以外は、実施例1と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例9と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例10と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例11と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例12と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例13と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシンを添加しなかったこと以外は、実施例15と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシン、ポリビニルアルコールを添加しなかったこと以外は、実施例1と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシン、ポリビニルアルコールを添加しなかったこと以外は、実施例13と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
グリシン、ポリビニルアルコールを添加しなかったこと以外は、実施例14と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
ビニルアルコールとエチレン性不飽和カルボン酸共重合体の中和塩、グリシンを添加しなかったこと以外は、実施例1と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
アミノ酸の代わりに、増粘剤としてカルボキシメチルセルロース(セロゲンBSH-6、第一工業製薬株式会社製)を添加したこと以外は、実施例1と同様の方法でバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表1に示す。
本発明の(A)成分、(B)成分及び(C)成分を含む実施例1~15では、(A)成分および(B)成分に加えて(C)成分が添加されていることで、非常に安定性に優れたスラリーを調製できることが明らかになった。
(実施例16)
カルボン酸含有高分子としてポリアクリル酸(アルドリッチ株式会社製、分子量:250,000)を(A-1)と(B-1)の混合物に対し、固形分として1重量%添加したこと以外は、実施例1と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアクリル酸を(A-1)と(B-1)の混合物に対し、固形分として4重量%添加したこと以外は、実施例16と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=35:65となるようにしたこと以外は、実施例17と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=45:55となるようにしたこと以外は、実施例17と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例16で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例17と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子をリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:300,000)にしたこと以外は、実施例17と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子をポリ(アクリル酸-マレイン酸)(アルドリッチ株式会社製、分子量:1,300)にしたこと以外は、実施例17と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
アクリル酸を100g、メタノールを400g添加したこと以外は実施例16と同様にして、目的の共重合体を合成した。得られた共重合体のエチレン性不飽和カルボン酸変性量は26.2モル%であった。さらに、水酸化リチウムを重合体中のカルボン酸単位に対し1.0当量添加して、前記共重合体の中和塩(B-8)の調製を行った。その後、実施例1で用いた市販のポリビニルアルコール(A-1)を固形分として、重量比で(A-1):(B-8)=7:93となるように添加した。さらに、カルボン酸含有高分子としてフミン酸(アルドリッチ株式会社製)を(A-1)と(B-8)の混合物に対し、固形分として0.01重量%添加しバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子としてリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:300,000)を(A-2)と(B-3)の混合物に対し、固形分として4重量%添加したこと以外は、実施例10と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子としてリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:300,000)を(A-2)と(B-4)の混合物に対し、固形分として4重量%添加したこと以外は、実施例11と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子としてリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:250,000)を(A-1)と(B-5)の混合物に対し、固形分として4重量%添加したこと以外は、実施例12と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子としてリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:300,000)を(A-1)と(B-6)の混合物に対し、固形分として4重量%添加したこと以外は、実施例13と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例27で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例27と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
カルボン酸含有高分子としてリチウム変性イソブテン-無水マレイン酸共重合体(中和度0.5、分子量:300,000)を(A-1)と(B-7)の混合物に対し、固形分として4重量%添加したこと以外は、実施例15と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
フミン酸を添加しなかったこと以外は、実施例23と同様にしてバインダー水溶液の調製を行いバインダー組成物として用いた。非水電解質電池用スラリーを上記実施例1と同様の方法によって作製し、スラリー安定性を確認した。さらに、実施例1と同様の方法によって電池用塗工負極を作製し、コイン電池を得て、充放電特性試験を行った。また同じく実施例1と同様の方法によって剥離強度用塗工電極を作製し、剥離強度測定を行った。結果を下記表2に示す。
本発明の(A)成分、(B)成分及び(C)成分を含む実施例16~29では、(A)成分および(B)成分に加えて(C)成分が添加されていることで非常に安定性に優れたスラリーを調製できることが明らかになった。このような本発明に係る実施例に対し、比較例13は高い充放電効率を示したものの、一方で、実施例と比べるとスラリー安定性が十分なものではなかった。
(実施例30)
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-1)と(B-1)の混合物に対し、固形分として1.0重量%添加したこと以外は、実施例1と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=35:65となるようにしたこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
(A-1)と(B-1)の混合物比を重量比で(A-1):(B-1)=45:55となるようにしたこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例1で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量5,000、ニットーボーメディカル株式会社製)を用いたこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリジアリルアミン(分子量5,000、ニットーボーメディカル株式会社製)を用いたこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリエチレンイミン(分子量10,000、ニットーボーメディカル株式会社製)を用いたこと以外は、実施例30と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-1)と(B-2)の混合物に対し、固形分として1重量%添加した以外は、実施例9と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-2)と(B-3)の混合物に対し、固形分として1重量%添加した以外は、実施例10と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-2)と(B-4)の混合物に対し、固形分として1重量%添加した以外は、実施例11と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-1)と(B-5)の混合物に対し、固形分として1重量%添加した以外は、実施例12と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリエチレンイミン(分子量1,600、ニットーボーメディカル株式会社製)を用いたこと以外は、実施例40と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1,600、ニットーボーメディカル株式会社製)を(A-1)と(B-6)の混合物に対し、固形分として1重量%添加した以外は、実施例13と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
実施例42で作製したビニルアルコールとアクリル酸共重合体10重量%水溶液100gに水酸化リチウムを重合体中のカルボン酸単位に対し0.2当量、水酸化ナトリウムを0.3当量添加したこと以外は、実施例42と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
ポリアミン類としてポリアリルアミン(分子量1600、ニットーボーメディカル株式会社製)を(A-1)と(B-7)の混合物に対し、固形分として1重量%添加した以外は、実施例15と同様の方法でバインダー水溶液の調製を行い、バインダー組成物として用いた。
本発明の(A)成分、(B)成分及び(C)成分を含む実施例30~44では、(A)成分および(B)成分に加えて(C)成分が添加されていることで非常に安定性に優れたスラリーを調製できることが明らかになった。また、(B)成分を構成している中和塩の効果で、本来なら抵抗成分となる(C)成分を添加しても92%以上の高い充放電効率を実現し、比較例1~13で示す充放電効率と遜色ないことが示された。これは(B)成分のポリマー塩が、粉末活性材料をコーティングしてイオン性導電性層を形成したために、容易にLiイオンが電池内を移動することができるようになった効果であり、(C)成分がゲル状物のような形成体をつくることなく、Liイオン輸送の妨げをしていない結果だと想定される。
Claims (11)
- (A)ポリビニルアルコール、
(B)ビニルアルコールとエチレン性不飽和カルボン酸との共重合体及びその中和塩から選択される少なくとも1つ、及び、
(C)アミノ酸、カルボン酸含有高分子、およびポリアミン類から選択される少なくとも1つ
を含むことを特徴とする、非水電解質電池用バインダー組成物。 - 前記(B)ビニルアルコールとエチレン性不飽和カルボン酸との共重合体及びその中和塩から選択される少なくとも1つが、ブロック共重合の形態で共重合している、請求項1に記載の非水電解質電池用バインダー組成物。
- 前記(B)ビニルアルコールとエチレン性不飽和カルボン酸との共重合体及びその中和塩から選択される少なくとも1つが、グラフト共重合の形態で共重合している、請求項1に記載の非水電解質電池用バインダー組成物。
- 前記(B)ビニルアルコールとエチレン性不飽和カルボン酸との共重合体及びその中和塩から選択される少なくとも1つにおける、エチレン性不飽和カルボン酸変性量が0.1~60モル%である、請求項1~3のいずれかに記載の非水電解質電池用バインダー組成物。
- 前記バインダー組成物中における、前記(B)成分の含有量が50.0~99.9重量%である、請求項1~4のいずれかに記載の非水電解質電池用バインダー組成物。
- 前記(C)成分が、カルボン酸含有高分子を含み、該カルボン酸高分子が、マレイン酸-アクリル酸の共重合体、イソブテン-マレイン酸の共重合体及びこれらの中和塩からなる群から選択される少なくとも一つである、請求項1~5のいずれかに記載の非水電解質電池用バインダー組成物。
- 前記(C)成分が、ポリアミン類を含む、請求項1~5のいずれかに記載の非水電解質電池用バインダー組成物。
- 請求項1~7のいずれかに記載のバインダー組成物と水とを含有する、非水電解質電池用バインダー水溶液。
- 請求項1~7のいずれかに記載のバインダー組成物と活物質と水とを含有する、非水電解質電池用スラリー組成物。
- 請求項1~7のいずれかに記載のバインダー組成物と活物質とを含有する混合層を集電体に結着してなる、非水電解質電池用電極。
- 請求項10に記載の非水電解質電池用電極を有する、非水電解質電池。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2020136266A (ja) * | 2019-02-15 | 2020-08-31 | 株式会社村田製作所 | リチウムイオン二次電池の負極添加剤及びそれを含むリチウムイオン二次電池の負極スラリー |
| WO2021172385A1 (ja) * | 2020-02-26 | 2021-09-02 | 住友精化株式会社 | 二次電池用結着剤に用いられる高分子化合物の製造方法 |
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| EP3842229B1 (en) * | 2018-08-22 | 2023-12-13 | Toppan Printing Co., Ltd. | Water-resistant gas barrier film, and method for producing water-resistant gas barrier film |
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| KR102504187B1 (ko) * | 2021-09-29 | 2023-03-02 | 주식회사 한솔케미칼 | 분리막용 공중합체 및 이를 포함하는 이차전지 |
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| CN115642219A (zh) * | 2022-09-23 | 2023-01-24 | 广西科技大学 | 一种无集流体电极的制作方法 |
| KR102558449B1 (ko) * | 2022-10-14 | 2023-07-24 | 주식회사 한솔케미칼 | 공중합체 조성물을 포함하는 바인더, 상기 바인더를 포함하는 이차전지용 음극 및 상기 음극을 포함하는 이차전지 |
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| JP2020136266A (ja) * | 2019-02-15 | 2020-08-31 | 株式会社村田製作所 | リチウムイオン二次電池の負極添加剤及びそれを含むリチウムイオン二次電池の負極スラリー |
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| WO2021172385A1 (ja) * | 2020-02-26 | 2021-09-02 | 住友精化株式会社 | 二次電池用結着剤に用いられる高分子化合物の製造方法 |
| JP2021136122A (ja) * | 2020-02-26 | 2021-09-13 | 住友精化株式会社 | 二次電池用結着剤に用いられる高分子化合物の製造方法 |
| KR20220021771A (ko) * | 2020-08-14 | 2022-02-22 | 주식회사 엘지에너지솔루션 | 전극 슬러리 조성물, 이의 제조방법 및 이의 용도 |
| KR102880140B1 (ko) * | 2020-08-14 | 2025-11-04 | 주식회사 엘지에너지솔루션 | 전극 슬러리 조성물, 이의 제조방법 및 이의 용도 |
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| JP2025509389A (ja) * | 2022-03-15 | 2025-04-11 | ハンソル ケミカル カンパニー リミテッド | 共重合体組成物を含むバインダー、前記バインダーを含む二次電池用負極および前記負極を含む二次電池 |
| JP7780035B2 (ja) | 2022-03-15 | 2025-12-03 | ハンソル ケミカル カンパニー リミテッド | 共重合体組成物を含むバインダー、前記バインダーを含む二次電池用負極および前記負極を含む二次電池 |
| JP2025511973A (ja) * | 2022-04-11 | 2025-04-16 | ハンソル ケミカル カンパニー リミテッド | 共重合体を含むバインダー、前記バインダーを含む二次電池用負極、前記負極を含む二次電池、および前記共重合体の重合方法 |
| WO2025047156A1 (ja) * | 2023-08-29 | 2025-03-06 | パナソニックIpマネジメント株式会社 | 電気化学デバイス |
Also Published As
| Publication number | Publication date |
|---|---|
| US20200136145A1 (en) | 2020-04-30 |
| KR20200014888A (ko) | 2020-02-11 |
| TW201904120A (zh) | 2019-01-16 |
| CN110785879A (zh) | 2020-02-11 |
| TWI802575B (zh) | 2023-05-21 |
| CN110785879B (zh) | 2023-01-17 |
| US11581543B2 (en) | 2023-02-14 |
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