WO2012046600A1 - 導電性架橋フィルム、該フィルムの製造方法および該フィルムの用途 - Google Patents
導電性架橋フィルム、該フィルムの製造方法および該フィルムの用途 Download PDFInfo
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- WO2012046600A1 WO2012046600A1 PCT/JP2011/072173 JP2011072173W WO2012046600A1 WO 2012046600 A1 WO2012046600 A1 WO 2012046600A1 JP 2011072173 W JP2011072173 W JP 2011072173W WO 2012046600 A1 WO2012046600 A1 WO 2012046600A1
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- vinylidene fluoride
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- electrolyte secondary
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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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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- 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
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
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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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M4/64—Carriers or 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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 conductive crosslinked film, a method for producing the film, and uses of the film.
- Non-aqueous electrolyte secondary batteries using lithium are mainly used as power sources for small electronic devices used in homes such as mobile phones, personal computers, and video camcorders as batteries that can obtain large energy with a small volume and weight. ing.
- a non-aqueous electrolyte secondary battery as a power source for a hybrid car, an electric vehicle, etc. In this case, vibration is applied to the non-aqueous electrolyte secondary battery during its use. In some cases, peeling between members, sliding off of the active material, or the like becomes a problem.
- the electrode of the nonaqueous electrolyte secondary battery is usually formed from a current collector and a mixture for a nonaqueous electrolyte secondary battery, and the mixture obtained from the mixture for a nonaqueous electrolyte secondary battery on the current collector A layer is formed.
- a mixture for a nonaqueous electrolyte secondary battery usually includes a binder resin, an electrode active material, and an organic solvent that act as a binder with the current collector.
- PVDF polyvinylidene fluoride
- the adhesive strength with a metal foil as a current collector is not limited to that of a non-aqueous electrolyte secondary battery as a hybrid car, When used as a power source for automobiles and the like, it has not been sufficient yet.
- the electrode including the resin current collector includes a current collector composed of a first current collector element including a first resin and a first conductive material, and a first active material including a first binder on the surface of the current collector.
- An electrode in which layers are laminated is known (see, for example, Patent Document 6).
- Patent Document 6 when the difference in solubility parameter between the first resin and the first binder is 0 to 2.5, the adhesion between the resin current collector and the active material layer is excellent, and the electric resistance of the electrode is reduced. It is disclosed that it can be suppressed.
- Patent Document 6 examinations other than the resin and the conductive material among the raw materials used when the resin current collector is manufactured are insufficient. Further, since the resin proposed in Patent Document 6 is an uncrosslinked resin, when a non-aqueous electrolyte secondary battery is manufactured using the resin current collector described in Patent Document 6, the resin is made up of an electrolyte. In some cases, it expanded or dissolved.
- a conductive composition comprising a polymer component comprising a fluoropolymer that can be suitably used to produce a circuit protection device and a particulate conductive filler dispersed in the polymer component (for example, And Patent Document 7).
- a conductive composition comprising a polymer component comprising a fluoropolymer that can be suitably used to produce a circuit protection device and a particulate conductive filler dispersed in the polymer component
- examination about components other than a fluorine-type polymer and a granular conductive filler was inadequate.
- Patent Document 7 does not describe obtaining a non-aqueous electrolyte secondary battery electrode using the conductive composition.
- the present invention has been made in view of the above-mentioned problems of the prior art, and is a conductive cross-linking that is excellent in peel strength between a mixture layer and a current collector when a non-aqueous electrolyte secondary battery electrode is produced.
- An object is to provide a film (current collector).
- Another object is to provide a non-aqueous electrolyte secondary battery electrode and a non-aqueous electrolyte secondary battery formed using the conductive crosslinked film.
- a conductive crosslinked film formed using a specific vinylidene fluoride resin composition uses the film as a current collector. It was found that when a non-aqueous electrolyte secondary battery electrode was obtained by forming a mixture layer on an electric body, the peel strength between the current collector and the mixture layer was excellent, and the present invention was completed.
- the conductive crosslinked film of the present invention comprises vinylidene fluoride polymer (a) 40 to 93 parts by weight, conductive carbon black (b) 5 to 25 parts by weight, crosslinking agent (c) 2 to 30 parts by weight, and It is formed by crosslinking a vinylidene fluoride resin composition containing 0 to 5 parts by weight of the lubricant (d) (provided that the total of (a) to (d) is 100 parts by weight).
- the vinylidene fluoride resin composition comprises a vinylidene fluoride polymer (a) 40 to 92.9 parts by weight, conductive carbon black (b) 5 to 25 parts by weight, and a crosslinking agent (c) 2 to 30 parts by weight.
- the lubricant (d) is preferably contained in an amount of 0.1 to 5 parts by weight, and the fibrous carbon (e) is also preferably contained in an amount of 0.1 to 5 parts by weight.
- the crosslinking is preferably performed by irradiating the vinylidene fluoride resin composition with ionizing radiation, and the ionizing radiation is preferably ultraviolet rays, electron beams, ⁇ rays, or ⁇ rays.
- the vinylidene fluoride polymer (a) is preferably a vinylidene fluoride polymer having 70 mol% or more of a structural unit derived from vinylidene fluoride.
- the lubricant (d) is preferably a metal soap lubricant, and the metal soap lubricant is preferably at least one metal soap lubricant selected from calcium stearate and magnesium stearate.
- the electrode for a non-aqueous electrolyte secondary battery of the present invention is formed from the conductive cross-linked film and a mixture for a non-aqueous electrolyte secondary battery containing a vinylidene fluoride polymer and an electrode active material.
- the negative electrode for a nonaqueous electrolyte secondary battery of the present invention is formed from the conductive crosslinked film, and a negative electrode mixture for a nonaqueous electrolyte secondary battery containing a vinylidene fluoride polymer and a carbon-based negative electrode active material.
- the positive electrode for a nonaqueous electrolyte secondary battery of the present invention is formed from the conductive crosslinked film, and a positive electrode mixture for a nonaqueous electrolyte secondary battery containing a vinylidene fluoride polymer and a lithium positive electrode active material.
- the conductive cross-linked film forms a multilayer film having a vinylidene fluoride resin composition layer and an olefin resin layer by co-extrusion of the vinylidene fluoride resin composition and an olefin resin. Obtained by peeling the olefin resin layer of the multilayer film to obtain a film made of the vinylidene fluoride resin composition, and irradiating the film made of the vinylidene fluoride resin composition with ionizing radiation. It is preferred that
- the method for producing a conductive crosslinked film of the present invention comprises a vinylidene fluoride polymer (a) 40 to 93 parts by weight, a conductive carbon black (b) 5 to 25 parts by weight, and a crosslinking agent (c) 2 to 30 parts by weight.
- the vinylidene fluoride resin composition containing 0 to 5 parts by weight of the lubricant (d) (provided that the total of (a) to (d) is 100 parts by weight) and the olefin resin are coextruded.
- a step (II) for obtaining a film comprising: a step (III) for irradiating the film comprising the vinylidene fluoride resin composition with ionizing radiation.
- the vinylidene fluoride resin composition comprises a vinylidene fluoride polymer (a) 40 to 92.9 parts by weight, conductive carbon black (b) 5 to 25 parts by weight, and a crosslinking agent (c) 2 to 30 parts by weight.
- the lubricant (d) is preferably contained in an amount of 0.1 to 5 parts by weight, and the melt flow rate (JIS K7210, 250 ° C., 2160 g load) of the olefin resin is preferably 1 g / 10 min or less.
- the nonaqueous electrolyte secondary battery of the present invention has the nonaqueous electrolyte secondary battery electrode (negative electrode and / or positive electrode) of the present invention.
- the conductive crosslinked film of the present invention is used as a current collector, and when the electrode for a nonaqueous electrolyte secondary battery is produced using the film, the peel strength between the electrode mixture layer and the current collector is increased. Excellent.
- the non-aqueous electrolyte secondary battery It can be suitably used as a current collector that constitutes a working electrode.
- the manufacturing method of the electroconductive crosslinked film of the present invention is an electroconductive cross-linked film having a thin thickness that can efficiently produce an electroconductive cross-linked film and is difficult to manufacture with a uniform thickness. Even if it exists, it can manufacture suitably.
- the conductive crosslinked film of the present invention comprises vinylidene fluoride polymer (a) 40 to 93 parts by weight, conductive carbon black (b) 5 to 25 parts by weight, crosslinking agent (c) 2 to 30 parts by weight, and a lubricant. (D) It is formed by crosslinking a vinylidene fluoride resin composition containing 0 to 5 parts by weight (provided that the total of (a) to (d) is 100 parts by weight).
- the conductive crosslinked film of the present invention can be suitably used as a current collector such as an electrode for a nonaqueous electrolyte secondary battery.
- the vinylidene fluoride polymer (a) is a polymer obtained by using at least vinylidene fluoride as a monomer, and may be a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and other monomers. Good. Further, the vinylidene fluoride polymer (a) may be one kind of polymer or two or more kinds of polymers.
- Examples of other monomers include fluorine monomers copolymerizable with vinylidene fluoride, monoesters of unsaturated dibasic acids, and hydrocarbon monomers.
- Examples of the fluorine-based monomer copolymerizable with vinylidene fluoride include perfluoroalkyl vinyl ethers typified by vinyl fluoride, trifluoroethylene, tetrafluoroethylene, hexafluoropropylene, and perfluoromethyl vinyl ether. .
- the monoester of unsaturated dibasic acid is preferably one having 5 to 8 carbon atoms, and examples thereof include maleic acid monomethyl ester, maleic acid monoethyl ester, citraconic acid monomethyl ester, and citraconic acid monoethyl ester.
- examples of the hydrocarbon monomer include ethylene, propylene, 1-butene and the like.
- hexafluoropropylene is preferred from the viewpoints of electrochemical stability and good processability.
- the said other monomer may be used individually by 1 type, and may use 2 or more types.
- the vinylidene fluoride polymer (a) is preferably a vinylidene fluoride polymer having 70 mol% or more of a structural unit derived from vinylidene fluoride from the viewpoint of electrochemical stability and good processability.
- a vinylidene fluoride polymer having a structural unit derived from vinylidene fluoride of 80 mol% or more is particularly preferable.
- the vinylidene fluoride polymer (a) is most preferably a homopolymer of vinylidene fluoride from the viewpoint of being more electrochemically stable.
- the production method of the vinylidene fluoride polymer (a) is not particularly limited, but can be produced by a known production method such as suspension polymerization, emulsion polymerization, or solution polymerization.
- aqueous suspension polymerization and emulsion polymerization are preferable from the viewpoint of ease of post-treatment and the like, and aqueous suspension polymerization is particularly preferable.
- vinylidene fluoride polymer (a) a commercially available product may be used, and for example, KF # 1000 (manufactured by Kureha), Solef 1010 (manufactured by Solvay) and the like can be used.
- the melt flow rate (MFR) measured at 235 ° C. under a load of 5000 g is preferably 0.6 to 30 g / 10 min in accordance with ASTM D1238. Within this range, it is preferable because it is easy to obtain a thin film of about 10 to 100 ⁇ m as the conductive crosslinked film of the present invention.
- the conductive carbon black (b) is not particularly limited, and examples of the conductive carbon black (b) include acetylene black, oil furnace black, and thermal black produced by an acetylene thermal decomposition method.
- Ketjen Black (trade name) is preferable because it has a structure in which graphite crystals are gathered on the surface of hollow shell particles, has a high surface area and a high oil absorption, and can exhibit high electrical conductivity.
- the volatile content of the conductive carbon black (b) is usually 1 wt% or less.
- the dibutyl phthalate (DBP) oil absorption of the conductive carbon black (b) is preferably 50 to 800 ml / 100 g, and more preferably 350 to 500 ml / 100 g. If the oil absorption is below the above range, the conductivity may be insufficient, and if it exceeds the above range, the dispersibility in the vinylidene fluoride polymer (a) tends to be poor.
- the BET specific surface area of the conductive carbon black (b) is preferably 35 to 1800 m 2 / g, more preferably 65 to 1400 m 2 / g.
- Ketjen black EC300J (trade name) (manufactured by Ketjen Black International, BET specific surface area 800 m 2 / g, DBP oil absorption 365 ml / 100 g, volatilization 0.4 wt%)
- Ketjen Black EC600JD (trade name) (Ketjen Black International, BET specific surface area 1400 m 2 / g, DBP oil absorption 495 ml / 100 g, volatile content 0.5 wt%), etc. it can.
- Crosslinking agent (c) Although there is no restriction
- the crosslinking agent (c) is preferably an unsaturated monomer having two or more ethylenic double bonds.
- examples of the crosslinking agent (c) include dimethylol tricyclodecane diacrylate, divinylbenzene, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butyl glycol dimethacrylate, and propylene glycol dimethacrylate.
- crosslinking agent (c) triallyl cyanurate and triallyl isocyanurate are preferable, and triallyl isocyanurate is more preferable from the viewpoint of crosslinking efficiency, heat resistance, and mechanical properties of the obtained conductive crosslinked film.
- the lubricant (d) used in the present invention is processed by improving the fluidity and dispersibility of the conductive carbon black (b) when the vinylidene fluoride resin composition is thermoformed into a film. It means a compounding agent added to facilitate the process.
- the lubricant (d) is not particularly limited, and examples thereof include aliphatic hydrocarbon lubricants, higher aliphatic alcohol lubricants, higher fatty acid lubricants, fatty acid amide lubricants, metal soap lubricants, fatty acid ester lubricants, and the like. Can be used.
- the lubricant (d) is preferably a metal soap lubricant from the viewpoint of compatibility with the vinylidene fluoride polymer (a) and thermal stability.
- aliphatic hydrocarbon lubricant examples include C 16 or more liquid paraffin, microcrystalline wax, natural paraffin, synthetic paraffin, polyethylene wax and partial oxides thereof, fluoride, chloride, and the like.
- higher aliphatic alcohol lubricant examples include higher aliphatic alcohols such as stearyl alcohol and behenyl alcohol.
- higher fatty acid-based lubricant examples include C 16 or higher fatty acids such as stearic acid and arachidic acid.
- fatty acid amide lubricant examples include stearic acid amide, N, N′-methylenebisamide, erucic acid amide and the like.
- a metal soap lubricant usually derived from a fatty acid having 12 to 30 carbon atoms and a metal (excluding sodium and potassium) is used.
- the fatty acid include stearic acid, lauric acid, ricinoleic acid, octylic acid, and the like.
- the metal include magnesium, calcium, lithium, barium, zinc, and aluminum.
- metal soap lubricant examples include barium stearate, calcium stearate, magnesium stearate, lithium stearate, stearic acid from the viewpoint of moldability of the vinylidene fluoride resin composition and dispersibility of the conductive carbon black (b).
- Zinc and aluminum stearate are preferable, and calcium stearate and magnesium stearate are more preferable.
- fatty acid ester lubricant examples include ethylene glycol monostearate and glycerin monostearate.
- lubricant (d) one type may be used alone, or two or more types may be used.
- Vinylidene fluoride resin composition In order to obtain the conductive crosslinked film of the present invention, a vinylidene fluoride resin composition containing the above (a) to (d) is used.
- the vinylidene fluoride resin composition comprises the vinylidene fluoride polymer (a) 40 to 93 parts by weight, the conductive carbon black (b) 5 to 25 parts by weight, the crosslinking agent (c) 2 to 30 parts by weight, and , Containing 0 to 5 parts by weight of lubricant (d).
- the total of (a) to (d) is 100 parts by weight.
- the vinylidene fluoride resin composition comprises 40 to 92.9 parts by weight of a vinylidene fluoride polymer (a), 5 to 25 parts by weight of conductive carbon black (b), and 2 to 30 crosslinking agents (c). It is preferable to contain 0.1 to 5 parts by weight of a lubricant and a lubricant (d).
- the vinylidene fluoride resin composition has excellent moldability because conductive carbon black (b) is dispersed in the vinylidene fluoride polymer (A) and usually contains a lubricant (d). Moreover, since it contains a crosslinking agent (c), it is possible to perform crosslinking.
- the vinylidene fluoride resin composition may not contain the lubricant (d), but preferably contains 0.1 to 5 parts by weight. Even when the vinylidene fluoride resin composition does not contain a lubricant (d), a nonaqueous electrolyte secondary battery was manufactured by lengthening the kneading zone of the kneader or optimizing the kneading conditions. In this case, it is possible to produce a conductive crosslinked film having excellent peel strength between the mixture layer and the current collector, but when the lubricant (d) is used in the above range, the lubricant (d) is not used. Compared with, a conductive crosslinked film can be easily obtained.
- the vinylidene fluoride resin composition comprises 50 to 90.9 parts by weight of the vinylidene fluoride polymer (a), 4 to 20 parts by weight of conductive carbon black (b), and 5 to 29 parts by weight of a crosslinking agent (c). And 0.1 to 1 part by weight of the lubricant (d) is more preferable from the viewpoint of resistance stability of the conductive crosslinked film of the present invention.
- the vinylidene fluoride resin composition may contain components other than the above (a) to (d).
- Examples of the components other than (a) to (d) contained in the vinylidene fluoride resin composition include fibrous carbon (e), fine metal powder, and metal oxide.
- the fibrous carbon (e) is carbon having a shape, and the ratio of the shortest diameter to the longest diameter (aspect ratio) is usually 5 to 1000.
- the fiber length of the fibrous carbon (e) is not particularly limited, but is usually 5 to 30 ⁇ m, preferably 10 to 20 ⁇ m.
- the vinylidene fluoride resin composition contains fibrous carbon (e) because the rigidity of the obtained conductive crosslinked film tends to be improved.
- the conductive carbon black (b) and the fibrous carbon (e) act as a conductive agent.
- the vinylidene fluoride resin composition contains fibrous carbon (e), it is 0.1 to 5 parts by weight, preferably 0 to 100 parts by weight in total of (a) to (d). 1 to 3 parts by weight.
- the vinylidene fluoride resin composition can be obtained by mixing the components (a) to (d) and other components optionally included. The mixing is performed by a known method.
- the conductive crosslinked film of the present invention is formed by crosslinking the vinylidene fluoride resin composition.
- the conductive cross-linked film of the present invention has excellent N-methyl-2-pyrrolidone (NMP) resistance, low diethyl carbonate (DEC) transmittance, and low volume resistivity, and therefore can be used as a current collector.
- NMP N-methyl-2-pyrrolidone
- DEC low diethyl carbonate
- the conductive crosslinked film of the present invention can be suitably used as a current collector constituting an electrode for a nonaqueous electrolyte secondary battery.
- the thickness of the conductive crosslinked film used in the present invention is usually from 10 to 200 ⁇ m, preferably from 20 to 180 ⁇ m, more preferably from 30 to 50 ⁇ m.
- the resin component constituting the film is mainly formed from the vinylidene fluoride polymer (a) and the crosslinking agent (c), N-methyl-2-pyrrolidone resistance ( NMP) is excellent and diethyl carbonate (DEC) transmittance is low.
- NMP N-methyl-2-pyrrolidone resistance
- DEC diethyl carbonate
- the NMP resistance of the conductive cross-linked film can be measured by the method described in Examples below and (5) Gel fraction, and the gel fraction is preferably 80 to 99%, 88 More preferably, it is ⁇ 97%.
- the gel fraction is within the above range, the electroconductive crosslinked film is excellent in NMP resistance, and it is preferable because the elution of the resin is small when the secondary battery mixture is applied to the film and dried.
- the DEC transmittance of the conductive cross-linked film can be measured by the method described in Examples below, (4) DEC transmittance, and the DEC transmittance is preferably 0 to 10%. 0 to 5% is more preferable.
- the DEC transmittance is within the above range, in the non-aqueous electrolyte secondary battery having the conductive cross-linked film of the present invention as a current collector, it is possible to suppress the electrolyte from passing through the current collector.
- the conductive crosslinked film of the present invention contains conductive carbon black (b) and optionally contains fibrous carbon (e), it has excellent conductivity and low volume resistivity.
- the volume resistivity of the conductive cross-linked film can be measured by the method described in Examples below, (3) Volume resistivity, and the volume resistivity is preferably 10 ⁇ cm or less, preferably 8 ⁇ cm or less. More preferably. The lower the volume resistivity, the better.
- the lower limit of the volume resistivity is not particularly limited, but is usually 0.1 ⁇ cm or more.
- the method for producing the conductive crosslinked film of the present invention is not particularly limited. However, since it is difficult to form a film after crosslinking the vinylidene fluoride resin composition, the vinylidene fluoride is usually used. After the resin composition is molded into a film, it is crosslinked to obtain a conductive crosslinked film.
- the method for forming the vinylidene fluoride resin composition into a film is not particularly limited.
- the vinylidene fluoride resin composition is pelletized by a melt extrusion method or the like, and the resulting pellet is melted.
- Examples of the method include forming into a film by a molding method such as extrusion molding, injection molding, and press molding.
- a method of melt-extruding the pellets for example, a method of forming the pellets into a film by melting them with a single-screw or twin-screw melt extruder and extruding them through a T-die or the like under general extrusion conditions. Is mentioned.
- a vinylidene fluoride resin composition when the vinylidene fluoride resin composition is formed into a thin film, the melt extrusion generally tends to make it difficult to make the thickness of the film uniform. Therefore, when a vinylidene fluoride resin composition is formed into a thin film, for example, a film having a thickness of 10 to 150 ⁇ m, it is formed as a multilayer film by coextrusion with another thermoplastic resin. It is preferable. In addition, when it forms as a multilayer film, it is necessary to peel the layer formed from another thermoplastic resin, but this peeling may be performed before bridge
- thermoplastic resin examples include olefin resin, polycarbonate, polyethylene terephthalate, and the like, and olefin resin that can be easily peeled off from the layer formed from the vinylidene fluoride resin composition is preferable.
- olefin resin examples include high density polyethylene (HDPE) and polypropylene (PP).
- HDPE high density polyethylene
- PP polypropylene
- the other thermoplastic resin preferably has a melt flow rate (MFR) (JIS K7210, 250 ° C., 2160 g load) of 1 g / 10 min or less from the viewpoint of melt tension at the time of molding, 0.5 g / It is more preferably 10 min or less, and particularly preferably 0.1 g / 10 min or less.
- MFR melt flow rate
- a thermoplastic resin whose MFR is 0.015 g / 10min or more is used.
- crosslinking is performed as described above, and the crosslinking is applied to a vinylidene fluoride resin composition, preferably a vinylidene fluoride resin composition formed into a film. It is preferable to carry out by irradiating with ionizing radiation.
- the vinylidene fluoride resin composition and the olefin resin are coextruded to form a vinylidene fluoride resin composition layer and an olefin resin layer.
- a step (I) of forming a multilayer film comprising: a step (II) of obtaining a film comprising a vinylidene fluoride resin composition by peeling off an olefin resin layer of the multilayer film, and the vinylidene fluoride resin composition
- the manufacturing method of the electroconductive crosslinked film which has process (III) which irradiates ionizing radiation to the film which consists of a thing is preferable.
- the production method can efficiently produce a conductive crosslinked film, and can be suitably produced even with a thin conductive crosslinked film that is difficult to produce with a uniform thickness. it can.
- ultraviolet rays, electron beams, ⁇ rays or ⁇ rays are preferable, and ⁇ rays are most preferable from the viewpoints of cross-linking efficiency, cross-linking uniformity, and the like.
- the irradiation dose is usually 10 to 300 kGy, preferably 50 to 200 kGy. If the irradiation dose is too small, crosslinking may not occur sufficiently. If the irradiation dose is too high, the resulting conductive crosslinked film tends to become brittle, so the above range is preferable.
- the electrode for a nonaqueous electrolyte secondary battery of the present invention is an electrode having the conductive crosslinked film as a current collector, and is an electrode formed from the conductive crosslinked film and a mixture for a nonaqueous electrolyte secondary battery It is.
- the mixture for the nonaqueous electrolyte secondary battery a mixture containing a vinylidene fluoride polymer and an electrode active material is used.
- the mixture for a non-aqueous electrolyte secondary battery of the present invention is excellent in peel strength between the conductive crosslinked film and the mixture layer.
- the nonaqueous electrolyte secondary battery electrode of the present invention can be used as a negative electrode or a positive electrode.
- a nonaqueous electrolyte secondary battery electrode as a negative electrode, that is, when obtaining a nonaqueous electrolyte secondary battery negative electrode
- a nonaqueous electrolyte secondary battery negative electrode mixture is used as a nonaqueous electrolyte secondary battery mixture.
- the electrode for nonaqueous electrolyte secondary batteries as a positive electrode, ie, when obtaining the positive electrode for nonaqueous electrolyte secondary batteries, as a mixture for nonaqueous electrolyte secondary batteries, the positive electrode for nonaqueous electrolyte secondary batteries Use a mixture.
- the electrode for a non-aqueous electrolyte secondary battery of the present invention may be a mixture containing a vinylidene fluoride polymer, whether it is used as a negative electrode or a positive electrode.
- the vinylidene fluoride-based polymer contained in the mixture is a polymer that acts as a binder resin, and any resin having a structural unit derived from vinylidene fluoride is not particularly limited. Examples thereof include polymers, copolymers of vinylidene fluoride and other monomers, modified products of homopolymers of vinylidene fluoride, and modified products of copolymers of vinylidene fluoride and other monomers. These resins are usually used alone or in combination of two or more.
- Examples of the other monomer include a carboxyl group-containing monomer, a carboxylic acid anhydride group-containing monomer, a fluorine-containing monomer excluding vinylidene fluoride, and an ⁇ -olefin.
- a carboxyl group-containing monomer a carboxylic acid anhydride group-containing monomer
- a fluorine-containing monomer excluding vinylidene fluoride a fluorine-containing monomer excluding vinylidene fluoride
- an ⁇ -olefin a monomer that may be used by 2 or more types.
- carboxyl group-containing monomer examples include acrylic acid, maleic acid, citraconic acid, maleic acid monomethyl ester, maleic acid monoethyl ester, citraconic acid monomethyl ester, citraconic acid monoethyl ester, and the like. Maleic acid, citraconic acid Maleic acid monomethyl ester and citraconic acid monomethyl ester are preferred.
- Examples of the carboxylic acid anhydride group-containing monomer include maleic anhydride and citraconic anhydride.
- fluorine-containing monomer excluding vinylidene fluoride examples include vinyl fluoride, trifluoroethylene, trifluorochloroethylene, tetrafluoroethylene, hexafluoropropylene and the like.
- ⁇ -Olefin includes ethylene, propylene, 1-butene and the like.
- the copolymer of vinylidene fluoride and other monomers is preferably a copolymer of vinylidene fluoride and maleic acid monomethyl ester, a copolymer of vinylidene fluoride, hexafluoropropylene and maleic acid monomethyl ester, or the like. It is done.
- the method for obtaining the vinylidene fluoride polymer contained in the mixture is not particularly limited, and can be obtained by a polymerization method such as suspension polymerization, emulsion polymerization, or solution polymerization.
- a modified product of a homopolymer of vinylidene fluoride or a copolymer of a copolymer of vinylidene fluoride and another monomer includes the homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and another monomer.
- the polymer can be obtained by modification.
- the vinylidene fluoride polymer used in the present invention preferably has 50 mol% or more of structural units derived from vinylidene fluoride (however, all the structural units are 100 mol%).
- a commercially available product may be used as the vinylidene fluoride polymer.
- the mixture for a non-aqueous electrolyte secondary battery used for producing the electrode for the non-aqueous electrolyte secondary battery of the present invention includes the vinylidene fluoride polymer and the electrode active material, and usually includes an organic solvent. .
- the mixture may contain other components. Examples of the other components include conductive additives such as carbon fibers, pigment dispersants, polymers other than vinylidene fluoride polymers, and the like. You may go out. Examples of the polymer other than the vinylidene fluoride polymer include styrene butadiene rubber and polyacrylonitrile.
- the negative electrode active material is used as the electrode active material contained in the mixture for nonaqueous electrolyte secondary batteries, and to obtain the positive electrode for nonaqueous electrolyte secondary batteries.
- a positive electrode active material is used for.
- the negative electrode active material examples include a carbon-based negative electrode active material composed of a carbon material, a metal-based negative electrode active material composed of a metal / alloy material or a metal oxide, and among them, a carbon-based negative electrode active material is preferable.
- the carbon-based negative electrode active material artificial graphite, natural graphite, non-graphitizable carbon, graphitizable carbon, or the like is used.
- the said carbon material may be used individually by 1 type, or may use 2 or more types.
- the energy density of the battery can be increased.
- the artificial graphite can be obtained, for example, by carbonizing an organic material, heat-treating it at a high temperature, pulverizing and classifying it.
- MAG series manufactured by Hitachi Chemical Co., Ltd.
- MCMB manufactured by Osaka Gas
- the non-graphitizable carbon can be obtained, for example, by firing a material derived from petroleum pitch at 1000 to 1500 ° C.
- a material derived from petroleum pitch at 1000 to 1500 ° C.
- Carbotron P manufactured by Kureha
- Kureha Kureha
- the specific surface area of the negative electrode active material is preferably 1 to 10 m 2 / g, and more preferably 2 to 6 m 2 / g.
- the specific surface area of the negative electrode active material can be determined by a nitrogen adsorption method.
- a lithium-based positive electrode active material containing at least lithium is preferable.
- the lithium-based positive active material for example, LiCoO 2, LiNi x Co 1 -x O 2 (0 ⁇ x ⁇ 1)
- Formula Limy 2 M such is, Co, Ni, Fe, Mn , Cr, V-like
- Y is a chalcogen element such as O and S
- a composite metal oxide having a spinel structure such as LiMn 2 O 4
- an olivine-type lithium compound such as LiFePO 4 It is done.
- Examples of the organic solvent usually contained in the nonaqueous electrolyte secondary battery mixture include, for example, N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, and hexamethylphosphoamide. , Dioxane, tetrahydrofuran, tetramethylurea, triethyl phosphate, trimethyl phosphate, etc., and N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide is preferably used. . Moreover, the organic solvent may be used alone or in combination of two or more.
- the mixture for a non-aqueous electrolyte secondary battery is preferably 0.5 to 15 parts by weight of the vinylidene fluoride polymer per 100 parts by weight in total of the vinylidene fluoride polymer and the electrode active material.
- the amount is preferably 1 to 10 parts by weight, and the active material is preferably 85 to 99.5 parts by weight, and more preferably 90 to 99 parts by weight.
- the organic solvent is preferably 20 to 300 parts by weight, and more preferably 50 to 200 parts by weight.
- the components in the mixture may be mixed so as to form a uniform slurry, and the order of mixing is not particularly limited.
- the electrode for a nonaqueous electrolyte secondary battery of the present invention is usually obtained by applying and drying the mixture for a nonaqueous electrolyte secondary battery on a conductive cross-linked film as a current collector, and a current collector, And a layer formed from a nonaqueous electrolyte secondary battery mixture.
- a layer formed from a mixture for a nonaqueous electrolyte secondary battery which is formed by applying and drying a mixture for a nonaqueous electrolyte secondary battery on a current collector, a mixture layer I write.
- the coating amount of the mixture for a non-aqueous electrolyte secondary battery in the coating is preferably in the range where the weight of the mixture layer after coating and drying is 100 to 300 g / m 2, and 130 to 200 g. More preferably, it is in the range of / m 2 .
- the mixture for nonaqueous electrolyte secondary battery is applied to at least one surface, preferably both surfaces of the current collector.
- the method for coating is not particularly limited, and examples thereof include a method using a bar coater, a die coater, or a comma coater.
- drying performed after the coating is usually performed at a temperature of 50 to 150 ° C. for 1 to 300 minutes.
- the pressure at the time of drying is not particularly limited, but it is usually carried out under atmospheric pressure or reduced pressure.
- heat treatment may be performed after drying. When heat treatment is performed, it is usually performed at a temperature of 100 to 250 ° C. for 1 to 300 minutes. In addition, although the temperature of heat processing overlaps with the said drying, these processes may be a separate process and the process performed continuously.
- press processing may be performed.
- it is usually performed at 1 to 200 MPa-G. It is preferable to perform the press treatment because the electrode density can be improved.
- the electrode for nonaqueous electrolyte secondary batteries of the present invention can be produced.
- the layer structure of the mixture layer / current collector is Yes, when the mixture for a non-aqueous electrolyte secondary battery is applied on both sides of the current collector, it has a three-layer structure of a mixture layer / current collector / mixture layer.
- the electrode for a nonaqueous electrolyte secondary battery of the present invention is excellent in the peel strength between the current collector and the mixture layer by using the conductive cross-linked film and the mixture for nonaqueous electrolyte secondary batteries, the electrode Even when the non-aqueous electrolyte secondary battery having the above is used for applications where vibration, impact, or the like is applied, it is possible to suppress separation of the current collector and the mixture layer. Moreover, since it is excellent in peeling strength, it is preferable for cracking and peeling to occur in the electrode in the process of pressing, slitting, winding and the like when manufacturing the electrode, leading to improvement in productivity.
- the non-aqueous electrolyte secondary battery of the present invention has the non-aqueous electrolyte secondary battery electrode.
- the nonaqueous electrolyte secondary battery of the present invention may have the negative electrode for a nonaqueous electrolyte secondary battery, may have the positive electrode for a nonaqueous electrolyte secondary battery, or has both. May be.
- the nonaqueous electrolyte secondary battery of the present invention it is sufficient that at least one of the negative electrode and the positive electrode has the electrode for a nonaqueous electrolyte secondary battery, and other members, for example, a separator is not particularly limited, A well-known thing can be used.
- the nonaqueous electrolyte secondary battery of the present invention can be used for various applications. Since the nonaqueous electrolyte secondary battery of the present invention is excellent in the peel strength between the current collector and the mixture layer by using the electrode for a nonaqueous electrolyte secondary battery as an electrode constituting the battery, Even when the nonaqueous electrolyte secondary battery of the invention is used for applications in which vibration, impact, etc. are applied, it is possible to suppress separation of the current collector and the mixture layer. For this reason, the nonaqueous electrolyte secondary battery of the present invention can be suitably used as a power source for a hybrid car, an electric vehicle or the like to which vibration or impact is applied when used.
- the polymer slurry was dehydrated, washed with water and dried at 80 ° C. for 20 hours to obtain a powdered polar group-containing vinylidene fluoride polymer (A) containing a carboxyl group as a polar group.
- the polymerization yield was 90% by weight, and the inherent viscosity of the obtained polar group-containing vinylidene fluoride polymer (A) was 1.1 dl / g.
- the polymer slurry was dehydrated, washed with water and dried at 80 ° C. for 20 hours to obtain powdered polyvinylidene fluoride (B).
- the polymerization yield was 90% by weight, and the inherent viscosity of the obtained polyvinylidene fluoride (B) was 2.0 dl / g.
- TAIC triallyl isocyanurate
- the obtained mixture was pelletized by a twin-screw kneader (Toshiki Machine TEM26SS).
- Extrusion speed of 2 m using a manifold two-layer T die and two single-screw melt extruders for surface lamination: PEX40-28H made by Pla Giken, for backside lamination: PEX30-24 made by Pla Giken
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (1).
- ⁇ -ray irradiation 100 kGy was performed on the obtained film to obtain a conductive crosslinked film (1) having a thickness of 50 ⁇ m.
- Example 2 6.99 kg of PVDF, 2 kg of acetylene black (Denka Black: granular, Denki Kagaku Kogyo Co., Ltd.), 1 kg of TAIC, and 10 g of calcium stearate were mixed with a mixer (super mixer).
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellet and HDPE (Novatech HF313 (trade name)), a multi-manifold two-layer T-die and two single-screw melt extruders (for front surface lamination and back surface lamination) was used to form a film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back layer (thickness 100 ⁇ m) formed from the HDPE.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (2).
- ⁇ -ray irradiation 100 kGy was performed on the obtained film to obtain a conductive crosslinked film (2) having a thickness of 50 ⁇ m.
- Example 3 7.79 kg of PVDF, 1 kg of ketjen black EC300J (trade name), 200 g of vapor grown carbon fiber VGCF (trade name) (manufactured by Showa Denko, average fiber diameter of 150 nm, average fiber length of 10 to 20 ⁇ m, aspect ratio of 10 to 500) 1 kg of TAIC and 10 g of calcium stearate were mixed with a mixer (super mixer).
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellet and HDPE (Novatech HF313 (trade name)), a multi-manifold two-layer T-die and two single-screw melt extruders (for front surface lamination and back surface lamination) was used to form a film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back layer (thickness 100 ⁇ m) formed from the HDPE.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (3).
- ⁇ -ray irradiation 100 kGy was performed on the obtained film to obtain a conductive crosslinked film (3) having a thickness of 50 ⁇ m.
- Example 4 8.19 kg of PVDF, 0.8 kg of Ketjen Black EC600JD (trade name) (manufactured by Ketjen Black International, BET specific surface area 1400 m 2 / g, DBP oil absorption 495 ml / 100 g, volatile content 0.5 wt%), 1 kg TAIC and 10 g of calcium stearate were mixed with a mixer (super mixer).
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellet and HDPE (Novatech HF313 (trade name)), a multi-manifold two-layer T-die and two single-screw melt extruders (for front surface lamination and back surface lamination) was used to form a film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back layer (thickness 100 ⁇ m) formed from the HDPE.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (4).
- ⁇ -ray irradiation 100 kGy was performed on the obtained film to obtain a conductive crosslinked film (4) having a thickness of 50 ⁇ m.
- Example 5 7.9 kg of PVDF, 1 kg of ketjen black EC300J (trade name), 1 kg of TAIC, and 10 g of calcium stearate were mixed in a mixer (super mixer).
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellet and HDPE (Novatech HF313 (trade name)), a multi-manifold two-layer T-die and two single-screw melt extruders (for front surface lamination and back surface lamination) was used to form a film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back layer (thickness 100 ⁇ m) formed from the HDPE.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (5).
- ⁇ -ray irradiation 200 kGy was performed on the obtained film to obtain a conductive crosslinked film (5) having a thickness of 50 ⁇ m.
- Example 6 7.19 kg of PVDF, 0.8 kg of ketjen black EC600JD (trade name), 2 kg of TAIC, and 10 g of calcium stearate were mixed in a mixer (super mixer).
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellets and HDPE (Novatech HF313 (trade name)) were mixed with a multi-manifold two-layer T-die and two uniaxial melt extruders (for front surface lamination and back surface lamination). The film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back surface layer (thickness 100 ⁇ m) formed from the HDPE was molded by coextrusion.
- the film having a surface layer (thickness 50 ⁇ m) formed from the pellets and a back surface layer (thickness 100 ⁇ m) formed from the HDPE was molded by coextrusion.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (6).
- ⁇ -ray irradiation 100 kGy was performed on the obtained film to obtain a conductive crosslinked film (6) having a thickness of 50 ⁇ m.
- the obtained mixture was pelletized with a twin-screw kneader (Toshiki Machine TEM26SS).
- Example 2 In the same manner as in Example 1, the obtained pellets and HDPE (Novatech HF313 (trade name)) were mixed with a multi-manifold two-layer T-die and two uniaxial melt extruders (for front surface lamination and back surface lamination). The film having a surface layer (thickness: 50 ⁇ m) formed from the pellets and a back layer (thickness: 100 ⁇ m) formed from the HDPE was molded by coextrusion.
- the film having a surface layer (thickness: 50 ⁇ m) formed from the pellets and a back layer (thickness: 100 ⁇ m) formed from the HDPE was molded by coextrusion.
- the back layer (HDPE layer) was peeled off from the film to obtain a conductive film (c1) having a thickness of 50 ⁇ m.
- the physical properties of the conductive crosslinked films (1) to (6) and the conductive film (c1) were measured by the following methods.
- a trouser-shaped test piece having a width of 10 mm and a length of 100 mm was obtained from each of the conductive crosslinked films (1) to (6) and the conductive film (c1).
- the tensile strength was measured at a measurement speed of 50 mm / min using Autograph AGS-J (load 1 kN).
- volume resistivity of the conductive crosslinked films (1) to (6) and the conductive film (c1) was measured by the following method.
- the DEC (diethyl carbonate) transmittance of the conductive crosslinked films (1) to (6) and the conductive film (c1) was determined by the following method.
- Each of the conductive cross-linked films (1) to (6) and the conductive film (c1) is cut into two 70 ⁇ 70 mm squares, the two cut out films are overlapped, and three sides are used using a heat sealer, A bag was prepared by heat-sealing with a seal width of 10 mm. After adding 2 ml of DEC to the bag, the opening was heat sealed with a heat sealer with a seal width of 10 mm to obtain a bag with DEC.
- DEC transmittance was determined from the change in weight of the DEC bag before and after standing at room temperature for 400 hours.
- the conductive crosslinked films (1) to (6) and the conductive film (c1) were each cut out with a scissors to obtain a 5 g sample.
- Each 5 g sample was weighed into a flask, and 195 g of solvent (NMP) was added to the flask to obtain a sample solution.
- the flask containing the sample solution was heated in the hot water bath (60 ° C.) for 1 hour.
- the heated sample solution was passed over a 20 mesh wire mesh immediately after heating.
- the gel remaining on the wire mesh was dried, and the obtained solid was weighed to determine the gel fraction.
- the total components used when obtaining the mixture were 100 wt%.
- Example 7 92 parts by weight of non-graphitizable carbon (manufactured by Kureha, Carbotron P, specific surface area 3.5 to 5 m 2 / g), 6 parts by weight of a polar group-containing vinylidene fluoride polymer (A), gas phase method as a conductive assistant Carbon fiber VGCF (manufactured by Showa Denko) and 2 parts by weight of N-methyl-2-pyrrolidone (NMP) for dilution were mixed to prepare a solid content concentration of 52% by weight, and kneading machine (manufactured by Shinky Corp .; AR- 250) was kneaded for 5 minutes to obtain a negative electrode mixture (A) for a non-aqueous electrolyte secondary battery.
- NMP N-methyl-2-pyrrolidone
- Example 8 to 12 An electrode having a mixture layer density of 1.7 g / cm 3 was prepared in the same manner as in Example 7 except that the conductive crosslinked film (1) was replaced with the conductive crosslinked films (2) to (6). Negative electrode) was obtained.
- Example 2 The negative electrode mixture (A) for a non-aqueous electrolyte secondary battery similar to that in Example 7 was dried using a bar coater on a rolled copper foil having a thickness of 10 ⁇ m so that the weight of the mixture layer after drying was 150 g / m 2 . After uniformly coating and drying at 120 ° C. in a gear oven, pressing was performed at 40 MPa-G to obtain an electrode (negative electrode) having a mixture layer density of 1.7 g / cm 3 .
- Non-graphitizable carbon manufactured by Kureha, Carbotron P, specific surface area 3.5-5 m 2 / g 95 parts by weight, styrene butadiene rubber suspension (manufactured by Nippon Zeon, BM400B, 2 parts by weight as rubber), carboxymethylcellulose (CMC) Aqueous solution (manufactured by Daicel Chemical Industries, product number 1160, 1 part by weight as CMC component), 2 parts by weight of vapor grown carbon fiber VGCF (manufactured by Showa Denko) as a conductive additive and water for dilution are mixed to obtain a solid content The concentration was adjusted to 55% by weight, and the mixture was kneaded for 5 minutes using a kneader (manufactured by Shinky Corp .; AR-250) to obtain a negative electrode mixture (B) for nonaqueous electrolyte secondary batteries.
- CMC carboxymethylcellulose
- Aqueous solution manufactured by Daicel Chemical Industries, product number
- Example 13 94 parts by weight of LiCoO 2 (manufactured by Nippon Chemical Industry Co., Ltd .; “Cellseed C-10N”), Ketjen Black ECP (trade name) as carbon black (Ketjen Black International, Ketjen Black EC300J powder product, 200 3 parts by weight of mesh (75 ⁇ m pass 98% or more), 3 parts by weight of polyvinylidene fluoride (B), and NMP are mixed to prepare a solid content concentration of 67%.
- a kneader manufactured by Shinky Corp .; AR-250
- Example 14 to 18 An electrode in which the density of the mixture layer is 3.4 g / cm 3 is carried out in the same manner as in Example 13 except that the conductive crosslinked film (1) is replaced with the conductive crosslinked films (2) to (6). Positive electrode) was obtained.
- Example 13 The same procedure as in Example 13 was carried out except that the positive electrode mixture (C) for nonaqueous electrolyte secondary batteries was replaced with the positive electrode mixture (D) for nonaqueous electrolyte secondary batteries, and the density of the mixture layer was 3.4 g. An electrode (positive electrode) of / cm 3 was obtained.
- the peel strength between the electrode (negative electrode and positive electrode) current collector (conductive cross-linked films (1) and (2), conductive film (c1), copper foil, aluminum foil) and the mixture layer is JIS K6854 The measurement was performed according to a 90 ° peel test.
- Table 2 shows the evaluation results of the current collector, the mixture, and the peel strength that form the electrodes obtained in Examples and Comparative Examples.
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Abstract
Description
前記フッ化ビニリデン系重合体(a)は、モノマーとして少なくともフッ化ビニリデンを用いて得られる重合体であり、フッ化ビニリデンの単独重合体でも、フッ化ビニリデンと他のモノマーとの共重合体でもよい。また、フッ化ビニリデン系重合体(a)は、1種の重合体でも、二種以上の重合体であってもよい。
前記導電性カーボンブラック(b)としては、特に制限はないが、導電性カーボンブラック(b)としては、アセチレンの熱分解法で製造されるアセチレンブラック、オイルファーネスブラック、サーマルブラック等が挙げられる。
架橋剤(c)としては、特に制限はないが、前記フッ化ビニリデン系重合体(a)に対する分散性に優れる架橋剤を用いることが好ましい。
本発明に用いられる滑剤(d)とは、フッ化ビニリデン系樹脂組成物を、フィルム状に加熱成形するときに、その流動性、導電性カーボンブラック(b)の分散性を改善することにより加工を容易にするために添加する配合剤を意味する。
本発明の導電性架橋フィルムを得るためには、上記(a)~(d)を含むフッ化ビニリデン系樹脂組成物を用いる。
本発明の導電性架橋フィルムは、前記フッ化ビニリデン系樹脂組成物を架橋することにより形成される。
本発明の非水電解質二次電池用電極は、前記導電性架橋フィルムを集電体として有する電極であり、前記導電性架橋フィルムと、非水電解質二次電池用合剤とから形成される電極である。
本発明の非水電解質二次電池は、前記非水電解質二次電池用電極を有している。本発明の非水電解質二次電池は、前記非水電解質二次電池用負極を有していてもよく、前記非水電解質二次電池用正極を有していてもよく、両方を有していてもよい。
内容量2リットルのオートクレーブに、イオン交換水1040g、メチルセルロース0.8g、酢酸エチル2.5g、ジイソプロピルパーオキシジカーボネート4g、フッ化ビニリデン396gおよびマレイン酸モノメチルエステル4gを仕込み、28℃で47時間懸濁重合を行った。この間の最高圧力は4.2MPaに達した。
内容量2リットルのオートクレーブに、イオン交換水1100g、メチルセルロース0.2g、ジイソプロピルパーオキシジカーボネート2.2g、酢酸エチル3.7g、フッ化ビニリデン430gを仕込み、26℃で18.5時間懸濁重合を行った。この間の最高圧力は4.1MPaに達した。
7.99kgのポリフッ化ビニリデン(フッ化ビニリデン単独重合体、以下、PVDFとも記す。)(KF#1000(商品名)、クレハ製、MFR=8.8g/10min(ASTM D1238,235℃、5000g荷重))、1kgのケッチェンブラックEC300J(商品名)(ケッチェン・ブラック・インターナショナル製、BET比表面積800m2/g、DBP吸油量365ml/100g、揮発分0.4wt%)、1kgのトリアリルイソシアヌレート(以下、TAICとも記す。)、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
6.99kgのPVDF、2kgのアセチレンブラック(デンカブラック:粒状、電気化学工業(株))、1kgのTAIC、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
7.79kgのPVDF、1kgのケッチェンブラックEC300J(商品名)、200gの気相法炭素繊維VGCF(商品名)(昭和電工製、平均繊維径150nm、平均繊維長10~20μm、アスペクト比10~500)、1kgのTAIC、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
8.19kgのPVDF、0.8kgのケッチェンブラックEC600JD(商品名)(ケッチェン・ブラック・インターナショナル製、BET比表面積1400m2/g、DBP吸油量495ml/100g、揮発分0.5wt%)、1kgのTAIC、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
7.99kgのPVDF、1kgのケッチェンブラックEC300J(商品名)、1kgのTAIC、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
7.19kgのPVDF、0.8kgのケッチェンブラックEC600JD(商品名)、2kgのTAIC、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
8.99kgのポリフェニレンサルファイド(以下、PPSとも記す。)W316(商品名)、(クレハ製、溶融粘度160Pa・s(310℃、1200s-1))、1kgのケッチェンブラックEC300J(商品名)、10gのステアリン酸カルシウムを混合機(スーパーミキサー)で混合した。
前記導電性架橋フィルム(1)~(6)および導電性フィルム(c1)の厚さはそれぞれ、デジタルダイヤルゲージ(小野測器製:DG-925)を用いて測定した。
前記導電性架橋フィルム(1)~(6)および導電性フィルム(c1)について、引張強度を以下の方法で測定した。
前記導電性架橋フィルム(1)~(6)および導電性フィルム(c1)について、体積抵抗率を以下の方法で測定した。
前記導電性架橋フィルム(1)~(6)および導電性フィルム(c1)について、DEC(ジエチルカーボネート)透過率を以下の方法で求めた。
前記導電性架橋フィルム(1)~(6)および導電性フィルム(c1)について、ゲル分率を以下の方法で求めた。
難黒鉛化性炭素(クレハ製、カーボトロンP、比表面積3.5~5m2/g)92重量部、極性基含有フッ化ビニリデン系重合体(A)6重量部、導電助剤として気相法炭素繊維VGCF(昭和電工製)2重量部および希釈用のN-メチル-2-ピロリドン(NMP)を混合して固形分濃度52重量%に調製し、混練機((株)シンキー製; AR-250)を用いて5分間混練し、非水電解質二次電池用負極合剤(A)を得た。
導電性架橋フィルム(1)を、導電性架橋フィルム(2)~(6)に代えた以外は、実施例7と同様に行い、合剤層の密度が1.7g/cm3である電極(負極)を得た。
実施例7と同様の前記非水電解質二次電池用負極合剤(A)を、厚さ10μmの圧延銅箔にバーコーターを用いて、乾燥後の合剤層の重量が150g/m2になるように均一に塗布し、ギアオーブン中で120℃で乾燥した後に、40MPa‐Gでプレスを行い、合剤層の密度が1.7g/cm3である電極(負極)を得た。
難黒鉛化性炭素(クレハ製、カーボトロンP、比表面積3.5~5m2/g)95重量部、スチレンブタジエンゴム懸濁液(日本ゼオン製、BM400B、ゴム分として2重量部)、カルボキシメチルセルロース(CMC)水溶液(ダイセル化学工業製、品番1160、CMC分として1重量部)、導電助剤として気相法炭素繊維VGCF(昭和電工製)2重量部および希釈用の水を混合して固形分濃度55重量%に調製し、混練機((株)シンキー製; AR-250)を用いて5分間混練し、非水電解質二次電池用負極合剤(B)を得た。
厚さ10μmの圧延銅箔を、導電性架橋フィルム(1)に代えた以外は、比較例3と同様に行い、合剤層の密度が1.7g/cm3である電極(負極)を得た。
導電性架橋フィルム(1)を、導電性フィルム(c1)に代えた以外は、実施例7と同様に行い、合剤層の密度が1.7g/cm3である電極(負極)を得た。
LiCoO2(日本化学工業(株)製;「セルシード C-10N」)94重量部、カーボンブラックとしてケッチェンブラックECP(商品名)(ケッチェン・ブラック・インターナショナル製、ケッチェンブラックEC300Jの粉末品、200メッシュ・75μmパス98%以上)3重量部、ポリフッ化ビニリデン(B)3重量部、NMPを混合して固形分濃度を67%に調製し、混練機((株)シンキー製; AR-250)を用いて5分間混練し、非水電解質二次電池用正極合剤(C)を得た。前記非水電解質二次電池用正極合剤(C)を、前記導電性架橋フィルム(1)に塗工装置(東洋システム(株)製; TOSMAC 100WI-E)を用いて塗布し、0.3m/分のライン速度(乾燥炉のライン長=1m)で130℃、風速設定目盛り50%の条件で乾燥した後に、40MPa‐Gでプレスを行い、合剤層の密度が3.3g/cm3である電極(正極)を得た。
導電性架橋フィルム(1)を、導電性架橋フィルム(2)~(6)に代えた以外は、実施例13と同様に行い、合剤層の密度が3.4g/cm3である電極(正極)を得た。
実施例13と同様の前記非水電解質二次電池用正極合剤(C)を、厚さ10μmの圧延アルミ箔に塗工装置(東洋システム(株)製; TOSMAC 100WI-E)を用いて塗布し、0.3m/分のライン速度(乾燥炉のライン長=1m)で130℃、風速設定目盛り50%の条件で乾燥した後に、40MPa‐Gでプレスを行い、合剤層の密度が3.3g/cm3である電極(正極)を得た。
導電性架橋フィルム(1)を、導電性フィルム(c1)に代えた以外は、実施例13と同様に行い、合剤層の密度が3.3g/cm3である電極(正極)を得た。
LiCoO2(日本化学工業(株)製;「セルシード C-10N」)94重量部、カーボンブラックとしてケッチェンブラックECP(商品名)(ケッチェン・ブラック・インターナショナル製、ケッチェンブラックEC300Jの粉末品、200メッシュ・75μmパス98%以上)3重量部、エチレン‐アクリロニトリル共重合体(エチレン単位22モル%、アクリロニトリル単位78モル%)3重量部、NMPを混合して固形分濃度を67%に調製し、混練機((株)シンキー製; AR-250)を用いて5分間混練し、非水電解質二次電池用正極合剤(D)を得た。
Claims (18)
- フッ化ビニリデン系重合体(a)40~93重量部、
導電性カーボンブラック(b)5~25重量部、
架橋剤(c)2~30重量部および、
滑剤(d)0~5重量部を含有するフッ化ビニリデン系樹脂組成物(ただし、(a)~(d)の合計を100重量部とする)を架橋することにより形成される導電性架橋フィルム。 - 前記フッ化ビニリデン系樹脂組成物が、フッ化ビニリデン系重合体(a)40~92.9重量部、
導電性カーボンブラック(b)5~25重量部、
架橋剤(c)2~30重量部および、
滑剤(d)0.1~5重量部を含有する請求項1に記載の導電性架橋フィルム。 - 前記フッ化ビニリデン系樹脂組成物が、繊維状カーボン(e)0.1~5重量部を含む請求項1または2に記載の導電性架橋フィルム。
- 前記架橋が、フッ化ビニリデン系樹脂組成物に、電離放射線を照射することにより行われる請求項1~3のいずれか一項に記載の導電性架橋フィルム。
- 前記電離放射線が、紫外線、電子線、γ線またはα線である請求項4に記載の導電性架橋フィルム。
- 前記フッ化ビニリデン系重合体(a)が、フッ化ビニリデン由来の構成単位を70モル%以上有するフッ化ビニリデン系重合体である請求項1~5のいずれか一項に記載の導電性架橋フィルム。
- 前記滑剤(d)が、金属石鹸系滑剤である請求項1~6のいずれか一項に記載の導電性架橋フィルム。
- 前記金属石鹸系滑剤が、ステアリン酸カルシウムおよびステアリン酸マグネシウムから選択される少なくとも1種の金属石鹸系滑剤である請求項7に記載の導電性架橋フィルム。
- 請求項1~8のいずれか一項に記載の導電性架橋フィルムと、
フッ化ビニリデン系重合体および電極活物質を含む非水電解質二次電池用合剤とから形成される非水電解質二次電池用電極。 - 請求項1~8のいずれか一項に記載の導電性架橋フィルムと、
フッ化ビニリデン系重合体および炭素系負極活物質を含む非水電解質二次電池用負極合剤とから形成される非水電解質二次電池用負極。 - 請求項1~8のいずれか一項に記載の導電性架橋フィルムと、
フッ化ビニリデン系重合体およびリチウム系正極活物質を含む非水電解質二次電池用正極合剤とから形成される非水電解質二次電池用正極。 - 前記フッ化ビニリデン系樹脂組成物と、オレフィン系樹脂とを共押出することにより、フッ化ビニリデン系樹脂組成物層と、オレフィン系樹脂層とを有する複層フィルムを形成し、
前記複層フィルムのオレフィン系樹脂層を剥離し、フッ化ビニリデン系樹脂組成物からなるフィルムを得て、
前記フッ化ビニリデン系樹脂組成物からなるフィルムに電離放射線の照射を行うことにより得られる請求項1~8のいずれか一項に記載の導電性架橋フィルム。 - フッ化ビニリデン系重合体(a)40~93重量部、導電性カーボンブラック(b)5~25重量部、架橋剤(c)2~30重量部および、滑剤(d)0~5重量部を含有するフッ化ビニリデン系樹脂組成物(ただし、(a)~(d)の合計を100重量部とする)と、オレフィン系樹脂とを共押出することにより、フッ化ビニリデン系樹脂組成物層と、オレフィン系樹脂層とを有する複層フィルムを形成する工程(I)、
複層フィルムのオレフィン系樹脂層を剥離し、フッ化ビニリデン系樹脂組成物からなるフィルムを得る工程(II)、
前記フッ化ビニリデン系樹脂組成物からなるフィルムに電離放射線の照射を行う工程(III)を有する導電性架橋フィルムの製造方法。 - 前記フッ化ビニリデン系樹脂組成物が、フッ化ビニリデン系重合体(a)40~92.9重量部、導電性カーボンブラック(b)5~25重量部、架橋剤(c)2~30重量部および、滑剤(d)0.1~5重量部を含有する請求項13に記載の導電性架橋フィルムの製造方法。
- 前記オレフィン系樹脂のメルトフローレート(JIS K7210、250℃、2160g荷重)が1g/10min以下である請求項13または14に記載の導電性架橋フィルムの製造方法。
- 請求項9に記載の非水電解質二次電池用電極を有する非水電解質二次電池。
- 請求項10に記載の非水電解質二次電池用負極を有する非水電解質二次電池。
- 請求項11に記載の非水電解質二次電池用正極を有する非水電解質二次電池。
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| CN112913054A (zh) * | 2018-10-22 | 2021-06-04 | 三洋化成工业株式会社 | 负极用树脂集电体的制造方法、锂离子电池用负极的制造方法以及锂离子电池的制造方法 |
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| KR102553022B1 (ko) * | 2016-11-07 | 2023-07-07 | 셀가드 엘엘씨 | 개선된 전지 성능을 위한 첨가제, 개선된 첨가제 함유 멤브레인, 개선된 전지 분리기, 개선된 전지, 및 관련 방법 |
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| KR101464906B1 (ko) | 2014-11-24 |
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| CN103155049A (zh) | 2013-06-12 |
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