WO2011070610A1 - 電極用バインダー組成物および電極用合剤スラリー - Google Patents
電極用バインダー組成物および電極用合剤スラリー Download PDFInfo
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- WO2011070610A1 WO2011070610A1 PCT/JP2009/006701 JP2009006701W WO2011070610A1 WO 2011070610 A1 WO2011070610 A1 WO 2011070610A1 JP 2009006701 W JP2009006701 W JP 2009006701W WO 2011070610 A1 WO2011070610 A1 WO 2011070610A1
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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
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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
-
- 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
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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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- 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 an electrode binder and an electrode mixture slurry, and more particularly to a binder composition for a lithium ion battery and a mixture slurry for a lithium ion battery.
- a lithium ion battery is a secondary battery that can be repeatedly used by charging.
- a positive electrode including a metal oxide such as lithium cobaltate (LiCoO 2 ) as a positive electrode active material, and graphite as a negative electrode active material. It is comprised from the negative electrode containing a carbon material, and electrolyte solution in which carbonates etc. are used as a solvent of electrolyte.
- charging / discharging is performed by moving lithium ions between the positive electrode and the negative electrode.
- Lithium ion batteries have higher energy density and higher discharge voltage than batteries such as NiCd batteries and NiMH batteries. For this reason, the lithium ion battery can be reduced in size and weight. Lithium ion batteries also have features such as no memory effect and excellent charge / discharge cycle characteristics. For this reason, lithium ion batteries are indispensable in mobile devices where downsizing and weight reduction are important product values such as notebook computers, mobile phones, portable game devices, digital cameras, and electronic notebooks. In recent years, mobile devices have not only been reduced in size and weight, but have been improved in functionality year by year, for example, equipped with a one-segment function. For this reason, mobile devices are required to have long-lasting high-capacity and high-performance batteries.
- the negative electrode is obtained by forming a negative electrode layer on the surface of a negative electrode current collector such as copper, using a negative electrode mixture slurry containing a negative electrode active material and a binder.
- the binder is necessary for binding the active materials and the active material and the current collector, and preventing the active material from peeling from the current collector.
- NMP N-methyl-2-pyrrolidone
- PVDF polyvinylidene fluoride
- PVDF is excellent as a binder for integrating carbon materials, it does not have good adhesion to a current collector metal such as copper. For this reason, if charging and discharging are repeatedly performed in a battery in which PVDF is used as a binder, the carbon material as an active material is peeled off from the current collector and the battery capacity is reduced, that is, the cycle life is shortened. There's a problem.
- the volume of the negative electrode active material expands by 3 to 4 times during charging. Therefore, in such a case, if a binder that does not have a sufficiently high binding force like a conventional binder is used, the active material is cracked or the active material is pulverized due to repeated expansion and contraction caused by charge and discharge. End up. As a result, such a battery has a problem that it suddenly decreases at a point in time when there is a charge / discharge cycle characteristic.
- An object of the present invention is to provide a binder composition for an electrode that has a strong binding force and does not inhibit the formation of a stable interface (SEI) on the surface of an active material.
- another subject of this invention is providing the mixture slurry for electrodes which utilized the said binder composition for electrodes effectively.
- an electrode binder composition containing at least one tetracarboxylic acid ester compound, at least one diamine compound, and an organic solvent can solve the above problems.
- the present invention was found.
- the tetracarboxylic acid ester compound has the following chemical formula (A) [wherein R 1 , R 2 , R 3 , R 4 are each independently hydrogen, a hydrocarbon group having 1 to 8 carbon atoms ( It may contain a hetero atom (for example, oxygen atom, nitrogen atom, sulfur atom, etc.), and may have a functional group (for example, carbonyl group, hydroxyl group, etc.) or a substituent (for example, aromatic ring). ) Or a phenyl group.
- A chemical formula (A) [wherein R 1 , R 2 , R 3 , R 4 are each independently hydrogen, a hydrocarbon group having 1 to 8 carbon atoms ( It may contain a hetero atom (for example, oxygen atom, nitrogen atom, sulfur atom, etc.), and may have a functional group (for example, carbonyl group, hydroxyl group, etc.) or a substituent (for example, aromatic ring). ) Or a phenyl group.
- R ′ is represented by the following chemical formula (A-1) or the following chemical formula (A-2) (wherein X represents O, S, CH 2 , C (CH 3 ) 2 , CO or a direct bond)]
- A-1 the following chemical formula
- A-2 the following chemical formula (A-2) (wherein X represents O, S, CH 2 , C (CH 3 ) 2 , CO or a direct bond)]
- X represents O, S, CH 2 , C (CH 3 ) 2 , CO or a direct bond
- tetracarboxylic acid ester compound selected from the group consisting of tetracarboxylic acid ester compounds is used.
- the tetracarboxylic acid ester compound can be easily obtained, for example, by esterifying the corresponding tetracarboxylic acid or tetracarboxylic dianhydride with an alcohol.
- the esterification is preferably performed at a temperature of 50 ° C. to 150 ° C.
- examples of the tetracarboxylic dianhydride include pyromellitic dianhydride (PMDA), 1,2,5,6-naphthalenetetracarboxylic dianhydride, 1,4,5, 8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 2,2 ′, 3,3′-biphenyltetracarboxylic dianhydride, 2,3,3 ′ 4′-biphenyltetracarboxylic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA), 2,2 ′, 3,3′-benzophenone tetracarboxylic dianhydride, 2,3,3 ′, 4′-benzophenone tetracarboxylic dianhydride, 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride, 3,3
- tetracarboxylic dianhydrides pyromellitic dianhydride (PMDA), 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA), 3,3 ′, 4 4,4'-benzophenone tetracarboxylic dianhydride (BTDA) is preferred.
- PMDA pyromellitic dianhydride
- BPDA 4,4′-biphenyltetracarboxylic dianhydride
- BTDA 4,4'-benzophenone tetracarboxylic dianhydride
- these tetracarboxylic dianhydrides may be used independently and may be used in mixture of 2 or more types.
- alcohols for esterifying tetracarboxylic dianhydride include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 2 -Methyl-2-propanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl- 2-butanol, 2,2-dimethyl-1-propanol, 1-hexanol, 2-methyl-1-pentanol, 4-methyl-2-pentanol, 2-ethyl-1-butanol, cyclohexanol, 2-methoxy Ethanol, 2-ethoxyethanol, 2- (methoxymethoxy) ethanol, 2-isopropoxyeta Monohydric alcohols such as alcohol, 2-butoxyethanol, 2-phenylethanol, 1-phenyl-1-hydroxye
- the diamine compound has the following chemical formula (B) [wherein R ′′ is the following chemical formula (B-1) or the following chemical formula (B-2) (where Y is O, S, C (CH 3) 2, CO or is preferably at least one diamine compound selected from the group consisting of the diamine compound represented by the direct bond represents a)].
- examples of the diamine compound include paraphenylenediamine (PPD), metaphenylenediamine (MPDA), 2,5-diaminotoluene, 2,6-diaminotoluene, 4,4′-diaminobiphenyl, 3 , 3′-dimethyl-4,4′-diaminobiphenyl, 3,3′-dimethoxy-4,4′-diaminobiphenyl, 2,2-bis (trifluoromethyl) -4,4′-diaminobiphenyl, 3, 3'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane (MDA), 2,2-bis- (4-aminophenyl) propane, 3,3'-diaminodiphenyl sulfide, 4,4'-diaminodiphenyl sulfide, 3 , 3′-diaminodiphenyl ether, 3,4′-
- diamine compounds paraphenylenediamine (PPD), metaphenylenediamine (MPDA), 4,4′-diaminodiphenylmethane (MDA), 3,4′-diaminodiphenylether (34 ODA), 4,4′- Diaminodiphenyl ether (ODA), 1,3-bis (3-aminophenoxy) benzene (133APB), 1,3-bis (4-aminophenoxy) benzene (134APB), 2,2-bis [4- (4-amino Phenoxy) phenyl] propane (BAPP) is preferred.
- these diamine compounds may be used independently and may be used in mixture of 2 or more types.
- the diamine compound preferably has a mole number equal to or greater than that of the tetracarboxylic acid ester compound. That is, it is preferable that the number of molecules of the diamine compound is larger than the number of molecules of the tetracarboxylic acid ester compound.
- the tetracarboxylic acid ester compound is BTDA
- the diamine compound easily reacts with the carbonyl group of BTDA, and as a result, a three-dimensional crosslinked product is formed by BTDA and the diamine compound, and the negative electrode active material expands and contracts. This is because it is suitable for relaxing the stress.
- the organic solvent may be any organic solvent that can dissolve the tetracarboxylic acid ester compound and the diamine compound, but the boiling point thereof is preferably 250 ° C. or less, and the boiling point is 225 ° C. C or less is more preferable. This is because if the boiling point of the organic solvent is 250 ° C. or less, the organic solvent hardly remains in the electrode.
- Examples of such an organic solvent include methanol (boiling point 65 ° C), ethanol (boiling point 78 ° C), 1-propanol (boiling point 97 ° C), 2-propanol (boiling point 82 ° C), 1- Butanol (boiling point 118 ° C), 2-butanol (boiling point 100 ° C), 2-methyl-1-propanol (boiling point 108 ° C), 2-methyl-2-propanol (boiling point 83 ° C), 1-pentanol (Boiling point 138 degrees C), 2-pentanol (boiling point 119 degrees C), 3-pentanol (boiling point 116 degrees C), 2-methyl-1-butanol (boiling point 128 degrees C), 3-methyl-1-butanol (Boiling point 131 degrees C), 2-methyl-2-butanol (boiling point 102 degrees C), 3-methyl-2-
- Ethers ethyl acetate (boiling point 77 ° C), propyl acetate (boiling point 102 ° C), butyl acetate (boiling point 126 ° C) and Carboxylic acid esters such as ⁇ -butyrolactone (boiling point 204 ° C), dimethyl carbonate (boiling point 90 ° C), ethyl methyl carbonate (boiling point 107 ° C), diethyl carbonate (boiling point 126 ° C), ethylene carbonate (boiling point 238 ° C) C), carbonate esters such as propylene carbonate (boiling point 242 ° C.) and butylene carbonate (boiling point 240 ° C.).
- these organic solvents may be used independently and may be used in mixture of 2 or more types.
- the organic solvent preferably has a maximum occupied molecular orbital (HOMO) of ⁇ 10 eV or less. If the highest occupied molecular orbital (HOMO) of the organic solvent is -10 eV or less, the organic solvent is not easily oxidized even in a high electromotive force lithium ion, and even if the organic solvent remains in the electrode mixture layer, there is a problem. It is because it does not produce.
- the highest occupied molecular orbital (HOMO) is a value obtained by software MOPAC (ver. 6 PM3) by a semi-empirical molecular orbital method.
- Examples of such an organic solvent include alcohols such as methanol (boiling point 65 ° C., HOMO 11.04 eV) and ethanol (boiling point 78 ° C., HOMO 11.13 eV), 1,2-dimethoxy.
- Ethane monoglyme boiling point 85 ° C, HOMO -10.59eV
- 1,2-diethoxyethane boiling point 121 ° C, HOMO -10.50eV
- bis (2-methoxyethyl) ether diglyme boiling point 160 ° C, HOMO -10.58 eV
- bis (2-ethoxyethyl) ether bis (2-ethoxyethyl) ether (boiling point 188 degrees C.
- HOMO 10.54 eV tetrahydrofuran
- biiling point 66 degrees C tetrahydrofuran
- dioxane dioxane
- ethers ethyl acetate (boiling point 77 degrees)
- HOMO -11.25 eV propyl acetate
- propyl acetate propyl acetate
- butyl acetate butyl acetate
- ⁇ -butyrolactone boiling point 204 degrees C, -11.
- Carboxylic acid esters such as 17 eV), dimethyl carbonate (boiling point 90 ° C., HOMO-11.62 eV), ethyl methyl carbonate (boiling point 107 ° C., HOMO 11.51 eV), diethyl carbonate (boiling point 127 ° C., HOMO ⁇ 11.45 eV), ethylene carbonate (boiling point 238 degrees C, HOMO -11.78 eV), propylene carbonate (boiling point 242 degrees C, HOMO -11.69 eV), butylene carbonate (boiling point 240 degrees C, HOMO -11.68 eV), etc. Carbonate ester And the like.
- these organic solvents may be used independently and may be used in mixture of 2 or more types.
- the binder composition for electrodes is not specifically limited, Since the reduction of solvent usage and density
- the electrode mixture slurry according to the present invention can be obtained by blending an active material into the electrode binder composition.
- the negative electrode active material that can be blended in the electrode mixture slurry is not particularly limited.
- graphite, mesocarbon microbeads (MCMB), tin and / or tin alloy, silicon And / or a silicon alloy when the negative electrode active material is an alloy, the negative electrode active material may include a material that forms an alloy with lithium.
- examples of the material to be alloyed with lithium include germanium, tin, lead, zinc, magnesium, sodium, aluminum, gallium, indium, and alloys thereof.
- the negative electrode active material is preferably silicon and / or a silicon alloy, and particularly preferably silicon.
- the positive electrode active material examples include LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiMnO 2 , LiCo 0.5 Ni 0.5 O 2 , LiNi 0.7 Co 0.2 Mn 0.1 O 2, and the like. Lithium-containing transition metal oxides, metal oxides not containing lithium such as MnO 2, and the like.
- the average particle diameter is although it does not specifically limit, It is preferable that they are 10 micrometers or more and 20 micrometers or less. If the particle size of the negative electrode active material particles becomes too small, the surface area of the negative electrode active material particles per unit weight increases, the contact area with the non-aqueous electrolyte increases, and the irreversible reaction increases, leading to a decrease in capacity. On the other hand, as the average particle size increases, the resistance between the negative electrode active material particles and the negative electrode current collector is reduced. On the other hand, stress due to the volume change of the negative electrode active material particles during charge / discharge acts to act as a negative electrode current collector. It is because it becomes easy to peel from the electric body.
- the weight of a binder is 5 to 50 weight% with respect to an active material.
- conductive powder may be added to the negative electrode mixture slurry.
- the conductive powder it is preferable to use a conductive carbon material or a conductive metal similar to a negative electrode current collector described later.
- the conductive carbon material include graphite, artificial graphite such as MCMB, and carbon nanotube.
- metals such as copper, nickel, iron, titanium, cobalt, and these alloys are mentioned.
- the viscosity of the electrode mixture slurry according to the present invention is not particularly limited, but is preferably 1 poise or more and 500 poise or less. It is because it is easy to apply to copper foil.
- the negative electrode current collector preferably has a surface roughness Ra of 0.1 ⁇ m or more.
- the anchor effect of the binder is greatly obtained in the negative electrode layer, and the adhesion between the negative electrode current collector and the negative electrode layer is improved. It is because it improves greatly.
- the material of the negative electrode current collector examples include metals such as copper, nickel, iron, titanium, and cobalt, and alloys thereof.
- a metal foil containing a copper element is preferable, and a copper foil or a copper alloy is used. A foil is more preferred.
- the layer containing a copper element may be formed on the surface of a metal foil made of a metal element other than copper.
- the thickness of the negative electrode current collector is not particularly limited, but is usually in the range of 10 ⁇ m to 100 ⁇ m.
- the method of applying the electrode mixture slurry according to the present invention to the current collector is not particularly limited, but the die coating method is preferred. After the die coating, the electrode mixture slurry is dried until it can be rolled to form a negative electrode mixture layer, and then the negative electrode mixture layer formed on the negative electrode current collector is rolled. When the negative electrode mixture layer is rolled, the density of the negative electrode mixture layer increases and the energy density of the battery increases, and part of the negative electrode active material particles are embedded in the negative electrode current collector. The adhesion area between the negative electrode current collector and the negative electrode current collector increases. For this reason, the adhesion of the negative electrode mixture layer to the negative electrode current collector is improved, and the negative electrode mixture layer is sufficiently adhered even to the negative electrode current collector whose surface is not roughened.
- the treatment temperature is preferably 200 ° C. to 500 ° C., more preferably 300 to 450 ° C. This is because the temperature is sufficient to convert the tetracarboxylic acid ester compound and the diamine compound in the electrode binder composition into polyimide.
- the non-oxidizing atmosphere include an inert gas atmosphere such as argon, a nitrogen gas atmosphere, and a vacuum atmosphere.
- the sintering process may be performed in a reducing atmosphere such as a hydrogen atmosphere. Among these atmospheres, an inert gas atmosphere such as argon is preferable.
- the sintering process examples include a discharge plasma sintering method and a hot press method.
- the elements in the current collector may diffuse into the active material particles of the active material layer by the sintering process. This is because when the copper element is contained on the surface of the current collector, the adhesion between the current collector and the active material layer can be improved by diffusing the copper element into the active material particles.
- the electrode binder composition according to the present invention is not a polymer-containing type such as an N-methyl-2-pyrrolidone (NMP) solution of polyvinylidene fluoride (PVDF) or an aqueous dispersion of styrene-butadiene rubber (SBR), It is a monomer-containing type containing a tetracarboxylic acid ester compound and a diamine compound. That is, when heat is applied to the electrode binder composition during drying or sintering of the electrode binder composition, the tetracarboxylic acid ester compound and the diamine compound cause an imidization reaction. During the imidization reaction, the by-product alcohol is sequentially desorbed and vaporized.
- NMP N-methyl-2-pyrrolidone
- PVDF polyvinylidene fluoride
- SBR aqueous dispersion of styrene-butadiene rubber
- the binder does not completely cover the active material such that the electrolytic solution cannot contact the active material. Therefore, if this electrode binder composition is used, there is a low risk of inhibiting the formation of a stable interface (SEI) on the active material surface.
- the inventors of the present application have confirmed that a composition containing a tetracarboxylic acid ester compound, a diamine compound, and an organic solvent is excellent in binding strength between active materials and between the active material and a current collector. Therefore, the binder composition for electrodes according to the present invention can firmly bind the active materials to each other and the active material and the current collector without inhibiting the formation of a stable interface (SEI) on the active material surface.
- the organic solvent when an organic solvent having a boiling point of 250 ° C. or less is employed as the organic solvent, the organic solvent hardly remains in the negative electrode layer. For this reason, when such a binder composition for electrodes is used, problems such as self-discharge can be prevented in advance.
- the organic solvent when an organic solvent having a highest occupied molecular orbital (HOMO) of ⁇ 10 eV or less is employed as the organic solvent, the organic solvent is difficult to be oxidized / reduced. For this reason, even if an organic solvent remains in the negative electrode layer, there is no problem.
- HOMO highest occupied molecular orbital
- this electrode binder composition can be easily thickened by adjusting the solid content. For this reason, it is not necessary to add a thickener or the like. Therefore, it is possible to avoid adding a thickener or the like that causes problems (such as a decrease in battery capacity) when remaining in the negative electrode layer.
- a synthesis vessel was formed by attaching a stirring rod with stirring blades made of polytetrafluoroethylene to a 500 mL three-necked flask.
- a stirring rod with stirring blades made of polytetrafluoroethylene
- 39.77 g (0.123 mol) of 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and ethanol (boiling point) so that the solid content becomes 50% by weight.
- BTDA 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride
- HOMO 11.13 eV
- the electrode mixture slurry was applied to a rolled copper foil having a thickness of 18 ⁇ m (manufactured by Nippon Copper Foil Co., Ltd.) and dried, and then the rolled copper foil was compression molded using a roll press. Subsequently, the rolled copper foil was heated in a vacuum atmosphere at 400 ° C. for 6 hours to form a mixture layer on the rolled copper foil. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- a binder composition for an electrode was prepared in the same manner as in Example 1 except that the molar ratio of the ester compound of BTDA: MPDA was 1: 1.05. The viscosity of the electrode binder composition at this time was 3 poise.
- an electrode mixture slurry and a mixture layer were formed in the same manner as in Example 1. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- An electrode was prepared in the same manner as in Example 1 except that 45.55 g of ethanol was replaced with a mixed solution of 28.50 g of diglyme (boiling point 160 ° C., HOMO 10.58 eV) and 17.06 g (0.370 mol) of ethanol.
- a binder composition was prepared. The viscosity of the electrode binder composition at this time was 25 poise.
- an electrode mixture slurry and a mixture layer were formed in the same manner as in Example 1. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- the solid content is changed from 50% to 20% by weight, the addition amount of BTDA is changed to 15.91 g (0.0494 mol), the addition amount of MPDA is changed to 5.87 g (0.0543 mol), and the addition amount of ethanol is changed.
- a composition was prepared. The viscosity of the electrode binder composition at this time was 20 poise.
- an electrode mixture slurry and a mixture layer were formed in the same manner as in Example 1. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- the solid content was changed from 50 wt% to 30 wt%, the addition amount of BTDA was changed to 13.48 g (0.0418 mol), and MPDA was changed to 2,2-bis [4- (4-aminophenoxy) phenyl] propane (BAPP )
- BAPP 2,2-bis [4- (4-aminophenoxy) phenyl] propane
- An electrode was prepared in the same manner as in Example 2 except that instead of 18.03 g (0.0439 mol), 45.55 g of ethanol was replaced with 68.49 g of 2-ethoxyethanol (boiling point 136 ° C., HOMO 10.67 eV).
- a binder composition was prepared. The viscosity of the electrode binder composition at this time was 0.7 poise.
- an electrode mixture slurry and a mixture layer were formed in the same manner as in Example 1. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- the solid content was changed from 50% to 40% by weight, 39.77 g of BTDA was changed to 17.08 g (0.0580 mol) of 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (BPDA), and MPDA was changed to
- BPDA 4,4′-biphenyltetracarboxylic dianhydride
- MPDA MPDA
- a binder composition was prepared. The viscosity of the electrode binder composition at this time was 200 poise.
- an electrode mixture slurry and a mixture layer were formed in the same manner as in Example 1. At this time, polyimide was firmly fixed to the copper foil in the mixture layer.
- the binder composition for an electrode according to the present invention has a feature that it has a strong binding force and does not inhibit the formation of a stable interface (SEI) on the surface of the active material.
- SEI stable interface
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Abstract
Description
-(2-エトキシエトキシ)エタノール、1-メトキシ-2-プロパノール、1-エトキシ-2-プロパノールおよびジプロピレングリコールなどの多価のアルコール類が挙げられる。なお、これらのアルコール類は、単独で用いられてもよいし、2種以上混合して用いられてもよい。
-(2-エトキシエトキシ)エタノール(沸点202度C)、1-メトキシ-2-プロパノール(沸点120度C)、1-エトキシ-2-プロパノール(沸点132度C)およびジプロピレングリコール(沸点232度C)などの多価のアルコール類、1,2-ジメトキシエタン(モノグライム 沸点85度C)、1,2-ジエトキシエタン(沸点121度C)、1,2-ジブトキシエタン(沸点203度C)、ビス(2-メトキシエチル)エーテル(ジグライム 沸点160度C)、ビス(2-エトキシエチル)エーテル(沸点188度C)、テトラヒドロフラン(沸点66度C)およびジオキサン(沸点101度C)などのエーテル類、酢酸エチル(沸点77度C)、酢酸プロピル(沸点102度C)、酢酸ブチル(沸点126度C)およびγ-ブチロラクトン(沸点204度C)などのカルボン酸エステル類、ジメチルカーボネート(沸点90度C)、エチルメチルカーボネート(沸点107度C)、ジエチルカーボネート(沸点126度C)、エチレンカーボネート(沸点238度C)、プロピレンカーボネート(沸点242度C)およびブチレンカーボネート(沸点240度C)などの炭酸エステル類が挙げられる。なお、これらの有機溶媒は、単独で用いられてもよいし、2種以上混合して用いられてもよい。
また、本発明に係る電極用合剤スラリーは、上記電極用バインダー組成物に活物質を配合することにより得られる。
また、本発明において、負極集電体の厚みは、特に限定されないが、通常、10μm~100μmの範囲である。
Claims (7)
- 少なくとも1種のテトラカルボン酸エステル化合物と、
少なくとも1種のジアミン化合物と、
有機溶媒と
を含有する電極用バインダー組成物。 - 前記有機溶媒は、沸点が250度C以下である
請求項1から3のいずれかに記載の電極用バインダー組成物。 - 前記有機溶媒は、最高被占分子軌道(HOMO)が-10eV以下である
請求項1から4のいずれかに記載の電極用バインダー組成物。 - 前記ジアミン化合物は、モル数が前記テトラカルボン酸エステル化合物のモル数以上である
請求項1から5のいずれかに記載の電極用バインダー組成物。 - 請求項1から6のいずれかに記載の電極用バインダー組成物と、
前記電極用バインダー組成物に混合される活物質と
を含有する電極用合剤スラリー。
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| CN200980162773.7A CN102934268B (zh) | 2009-12-08 | 2009-12-08 | 电极用粘合剂组合物和电极用混合物浆料 |
| PCT/JP2009/006701 WO2011070610A1 (ja) | 2009-12-08 | 2009-12-08 | 電極用バインダー組成物および電極用合剤スラリー |
| KR1020127014906A KR101539493B1 (ko) | 2009-12-08 | 2009-12-08 | 전극용 바인더 조성물 및 전극용 합제 슬러리 |
| US13/514,714 US8927151B2 (en) | 2009-12-08 | 2009-12-08 | Binder composition for electrodes and electrode mix slurry |
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| PCT/JP2009/006701 WO2011070610A1 (ja) | 2009-12-08 | 2009-12-08 | 電極用バインダー組成物および電極用合剤スラリー |
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| US (1) | US8927151B2 (ja) |
| KR (1) | KR101539493B1 (ja) |
| CN (1) | CN102934268B (ja) |
| WO (1) | WO2011070610A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013099558A1 (ja) * | 2011-12-26 | 2013-07-04 | 三洋電機株式会社 | リチウム二次電池の負極の製造方法、リチウム二次電池の負極及びリチウム二次電池 |
| JP2017076551A (ja) * | 2015-10-15 | 2017-04-20 | 株式会社豊田自動織機 | 中間組成物、負極電極用スラリー、及び負極電極の製造方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105609780B (zh) * | 2014-10-29 | 2019-01-25 | 江苏华东锂电技术研究院有限公司 | 电极粘结剂、正极材料以及锂离子电池 |
| KR101816236B1 (ko) | 2015-04-28 | 2018-01-08 | 삼성에스디아이 주식회사 | 전극 형성용 조성물 및 이로부터 제조된 전극과 태양전지 |
| CN106340613B (zh) * | 2015-07-13 | 2019-11-05 | 宁德时代新能源科技股份有限公司 | 负极片及锂离子电池 |
| CN106340652B (zh) * | 2015-07-17 | 2019-03-08 | 江苏华东锂电技术研究院有限公司 | 正极材料及锂硫电池 |
| CN106374108B (zh) * | 2015-07-20 | 2019-12-13 | 江苏华东锂电技术研究院有限公司 | 正极材料及锂硫电池 |
| WO2017188043A1 (ja) * | 2016-04-27 | 2017-11-02 | 株式会社カネカ | リチウムイオン二次電池用電極の製造方法 |
| US20200235375A1 (en) * | 2019-01-22 | 2020-07-23 | Ricoh Company, Ltd. | Liquid composition, electrode and method of manufacturing electrode, and electrochemical element and method of manufacturing electrochemical element |
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| Publication number | Publication date |
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| US8927151B2 (en) | 2015-01-06 |
| KR20120109498A (ko) | 2012-10-08 |
| CN102934268A (zh) | 2013-02-13 |
| CN102934268B (zh) | 2016-02-10 |
| US20120241667A1 (en) | 2012-09-27 |
| KR101539493B1 (ko) | 2015-07-24 |
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