WO2007088979A1 - 重合体組成物、二次電池電極用ペースト、及び二次電池電極 - Google Patents
重合体組成物、二次電池電極用ペースト、及び二次電池電極 Download PDFInfo
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- WO2007088979A1 WO2007088979A1 PCT/JP2007/051821 JP2007051821W WO2007088979A1 WO 2007088979 A1 WO2007088979 A1 WO 2007088979A1 JP 2007051821 W JP2007051821 W JP 2007051821W WO 2007088979 A1 WO2007088979 A1 WO 2007088979A1
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- polymer composition
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- sulfonic acid
- meth
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- RFFFKMOABOFIDF-UHFFFAOYSA-N Pentanenitrile Chemical compound CCCCC#N RFFFKMOABOFIDF-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
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- 230000002411 adverse Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
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- NBZANZVJRKXVBH-GYDPHNCVSA-N alpha-Cryptoxanthin Natural products O[C@H]1CC(C)(C)C(/C=C/C(=C\C=C\C(=C/C=C/C=C(\C=C\C=C(/C=C/[C@H]2C(C)=CCCC2(C)C)\C)/C)\C)/C)=C(C)C1 NBZANZVJRKXVBH-GYDPHNCVSA-N 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- CQLZEWXXRJJDKG-UHFFFAOYSA-N azanium;2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-nonadecafluorodecanoate Chemical compound [NH4+].[O-]C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CQLZEWXXRJJDKG-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 125000004966 cyanoalkyl group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- SKECXRFZFFAANN-UHFFFAOYSA-N n,n-dimethylmethanethioamide Chemical compound CN(C)C=S SKECXRFZFFAANN-UHFFFAOYSA-N 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- 150000002828 nitro derivatives Chemical class 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical group CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/16—Homopolymers or copolymers or vinylidene fluoride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/38—Carbon pastes or blends; Binders or additives therein
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
-
- 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
-
- 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
-
- 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
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to a polymer composition suitably used as a binder for a secondary battery electrode, a paste for a secondary battery electrode using the same, and a secondary battery electrode.
- a fluorine resin such as polytetrafluoroethylene or polyvinylidene fluoride is used as a binder.
- an organic solvent such as N-methylpyrrolidone (NMP) is used as a dispersion medium, and a paste is obtained by dispersing and mixing these with an active material, and then applied to a current collector and dried.
- the binder functions to improve the adhesion between the electrode layer containing the active material and the current collector.
- fluorinated resins such as polytetrafluoroethylene and polyvinylidene fluoride have not been sufficient in adhesion to the current collector. Adhesiveness between the electrode layer and the current collector is not sufficient, and a secondary battery using an electrode has a problem that battery characteristics such as charge / discharge characteristics cannot be improved.
- a polymer containing fluorine and a functional group such as a carboxyl group can be used to improve capacity reduction during high-speed discharge and capacity reduction due to repeated charge / discharge (cycle characteristics).
- An aqueous dispersion of a composite polymer obtained by combining an acrylic polymer with the polymer is disclosed (for example, see Patent Document 2).
- the electrode paste prepared using the aqueous dispersion of the composite polymer disclosed in Patent Document 2 may easily cause sediment when left for a long period of time. Needs to be improved. In addition, the above-mentioned improvement effect on capacity reduction was not sufficient.
- Patent Document 1 Japanese Patent Laid-Open No. 10-17714
- Patent Document 2 Japanese Patent No. 3601250
- the present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide a secondary battery excellent in cycle characteristics with less capacity loss during high-speed discharge. Manufacturing a polymer composition having good adhesion to a current collector, a paste for a secondary battery electrode, and a secondary battery having excellent cycle characteristics with less capacity loss during high-speed discharge. Another object of the present invention is to provide a secondary battery electrode having good adhesion between the electrode layer and the current collector.
- [1] (a) Fluoropolymer, (b) Structural unit derived from (meth) acrylic acid alkyl ester, sulfonic acid group-containing unsaturated monomer, amide group-containing unsaturated monomer And a functional group-containing polymer containing a structural unit derived from at least one selected from the group consisting of a sulfonic acid group and an amide group-containing unsaturated monomer.
- the (a) fluoropolymer is (a-1) 50 to 80% by mass of a structural unit derived from vinylidene fluoride and (a-2) a structural unit derived from propylene hexafluoride 20
- the functional group-containing polymer is (b-1) 40 to 80% by mass of a structural unit derived from (meth) acrylic acid alkyl ester, and (b-2) contains a sulfonic acid group. constituent units from 0.1 to 20 wt% you derived from an unsaturated monomer, and (b-5) other structural units 0-40 mass derived from an unsaturated monomer 0/0, is made of the force.
- the polymer composition according to any one of [1] to [4].
- the (b) functional group-containing polymer comprises 40 to 80% by mass of a structural unit derived from (b-1) (meth) acrylic acid alkyl ester, and (b-3) an amide group-containing polymer.
- the functional group-containing polymer (b) contains 40 to 80% by mass of a structural unit derived from (b-1) (meth) acrylic acid alkyl ester, and (b-2) contains a sulfonic acid group.
- Constituent units derived from unsaturated monomers 0 to 15% by mass
- the polymer composition according to any one of the above.
- the functional group-containing polymer is (b-1) 40 to 80% by mass of a structural unit derived from (meth) acrylic acid alkyl ester, and (b-4) sulfonic acid amide. constituent units from 0.1 to 20 mass% derived from group-containing unsaturated monomer, and (b-5) other structural units 0-30 mass 0/0 you derived from an unsaturated monomer, a force is also one
- the above-mentioned [1] to [4], Polymer composition is (b-1) 40 to 80% by mass of a structural unit derived from (meth) acrylic acid alkyl ester, and (b-4) sulfonic acid amide. constituent units from 0.1 to 20 mass% derived from group-containing unsaturated monomer, and (b-5) other structural units 0-30 mass 0/0 you derived from an unsaturated monomer, a force is also one
- the sulfonic acid group-containing unsaturated monomer is selected from the group consisting of styrene sulfonic acid, methallyloxybenzene sulfonic acid, allyloxybenzene sulfonic acid, allyl sulfonic acid, butyl sulfonic acid, methallyl sulfonic acid, and 4-sulfo.
- the polymer composition according to any one of [1] to [5] and [7], which is at least one selected from the group consisting of butyl metatalylate, isoprene sulfonic acid, and salt power thereof.
- a secondary battery electrode paste comprising the polymer composition according to any one of [1] to [12] and an electrode active material.
- a secondary battery electrode comprising:
- the polymer composition of the present invention can produce a secondary battery having excellent cycle characteristics with less capacity loss during high-speed discharge, and also has good effects such as good adhesion to a current collector. To do.
- the secondary battery electrode paste of the present invention can produce a secondary battery having excellent cycle characteristics with less capacity loss during high-speed discharge, and has good adhesion to a current collector. It is effective.
- the secondary battery electrode of the present invention can produce a secondary battery excellent in cycle characteristics with less capacity loss during high-speed discharge, and has good adhesion between the electrode layer and the current collector. There is an effect.
- One embodiment of the polymer composition of the present invention is a structural unit derived from (a) a fluoropolymer (hereinafter also referred to as “(a) component”) and (b) (meth) acrylic acid alkyl ester. And a structural unit derived from at least one selected from the group consisting of a sulfonic acid group-containing unsaturated monomer, an amide group-containing unsaturated monomer, and a sulfonic acid group / amide group-containing unsaturated monomer. And a functional group-containing polymer (hereinafter also referred to as “component (b)”). The details will be described below.
- the component (a) contained in the polymer composition of the present embodiment is a fluoropolymer.
- the component (a) is not particularly limited as long as it is a fluorine-containing polymer.
- the component (a) is a monomer containing (a 1) vinylidene fluoride and (a-2) propylene hexafluoride. What was obtained by polymerizing the components can be cited as a preferred example.
- the monomer component used to obtain the component (a) includes (a-1) vinylidene fluoride and (a)
- (a-3) Other unsaturated monomers other than hexafluoropropylene may be contained!
- Examples of (a-3) other unsaturated monomers that can be included include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, (meth) I-propyl acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, n-amyl (meth) acrylate, i-amyl (meth) acrylate, n- (meth) acrylate Xylyl, (meth) acrylic acid 2-ethylhexyl, (meth) acrylic acid n-octyl, (meth) acrylic acid n-nor, (meth) acrylic acid n-decyl, ethylene glycol di (meth) Atalylate, propylene glycol di (meth) atary
- Examples of the functional group in the unsaturated monomer having the specific functional group described above include a carboxyl group, a carboxylic anhydride group, an amide group, an amino group, a cyan group, an epoxy group, a bur group, Examples thereof include sulfonic acid groups. Of these, a carboxyl group, an amide group, an epoxy group, a cyano group, and a sulfonic acid group are preferable.
- Examples of the unsaturated monomer having a carboxyl group include unsaturated monocarboxylic acids such as acrylic acid, (meth) talic acid, and crotonic acid; maleic acid, fumaric acid, itaconic acid, citraconic acid, Examples thereof include unsaturated polycarboxylic acids such as mesaconic acid; free carboxyl group-containing alkyl esters and free carboxyl group-containing amides of the unsaturated polycarboxylic acid.
- unsaturated monocarboxylic acids such as acrylic acid, (meth) talic acid, and crotonic acid
- maleic acid, fumaric acid, itaconic acid, citraconic acid examples thereof include unsaturated polycarboxylic acids such as mesaconic acid; free carboxyl group-containing alkyl esters and free carboxyl group-containing amides of the unsaturated polycarboxylic acid.
- Examples of the unsaturated monomer having a carboxylic acid anhydride group include acid anhydrides of the unsaturated polycarboxylic acid.
- Examples of unsaturated monomers having an amide group include (meth) acrylamide, ⁇ - chloroacrylamide, ⁇ , ⁇ , -methylene (meth) acrylamide, ⁇ , ⁇ , monoethylene (meth) acrylamide, ⁇ —Hydroxymethyl (meth) acrylamide, ⁇ —2-Hydroxyethyl (meth) acrylamide, ⁇ —2-Hydroxypropyl (meth) acrylamide, ⁇ —3-Hydroxypropyl (meth) acrylamide, ctronamide, maleic acid Unsaturated carboxylic acid amides such as diamide, fumaric acid diamide, diacetone acrylamide; ⁇ -dimethylaminomethyl (meth) acryl amide, ⁇ —2-aminoethyl (meth) acrylamide, ⁇ —2-methylaminoethyl (meth) ) Acrylamide, ⁇ —2-Ethylamino
- Examples of the unsaturated monomer having an amino group include 2-aminoaminomethyl (meth) acrylate, 2-methylaminomethyl (meth) acrylate, 2-dimethylaminomethyl (meth) acrylate, 2-Aminoethyl (meth) acrylate, 2-Methylaminoethyl (meth) acrylate, 2-Ethylaminoethyl (meth) acrylate, 2-Dimethylaminoethyl (meth) acrylate, 2- Jetylaminoethyl (Meth) acrylate, 2-n-propylaminoethyl (meth) acrylate, 2- n-butylaminoethyl (meth) acrylate, 2-aminopropyl (meth) acrylate, 2-methylaminopropyl ( (Meth) atalylate, 2-dimethylaminopropyl (meth) atalylate, 3-aminopropyl (
- Examples of unsaturated monomers having a cyano group include unsaturated carboxylic acid-tolyls such as (meth) acrylonitrile, ⁇ -chloroacrylonitrile, vinylidene cyanide; 2-cyanoethyl (meth) Examples include acrylate, 2-cyanopropyl (meth) acrylate, and cyanoalkyl esters of unsaturated carboxylic acid of 3-cyanopropyl (meth) acrylate.
- Examples of the unsaturated monomer having an epoxy group include glycidyl (meth) acrylate,
- An unsaturated group-containing glycidyl compound such as (meth) aryl glycidyl ether can be used.
- Examples of the unsaturated monomer having a sulfonic acid group include 2-acrylamide-2-methylpropanesulfonic acid, styrenesulfonic acid (salt), isoprenesulfonic acid (salt), and the like. it can.
- the proportion of the structural unit derived from (a-1) vinylidene fluoride contained in the component (a) is preferably 50 to 80% by mass, and is preferably 55 to 80% by mass. More preferably, the content is 60 to 80% by mass.
- A-1 When the proportion of structural units derived from vinylidene fluoride is less than 50% by mass, the compatibility with structural units derived from (meth) acrylic acid alkyl esters is particularly poor.
- the resulting polymer composition tends to easily cause a layer separation phenomenon.
- seed polymerization of a structural unit derived from a (meth) acrylic acid alkyl ester and a structural unit derived from a sulfonic acid group-containing unsaturated monomer using a fluoropolymer as a seed will occur. Since it is difficult to occur, the compatibility between the fluorine-based polymer and the sulfonic acid group-containing polymer is insufficient, and the resulting polymer composition tends to easily cause a layer separation phenomenon.
- the proportion of the structural unit derived from (a-2) propylene hexafluoride contained in the component (a) is preferably 20 to 50% by mass, and preferably 20 to 45% by mass. Is more preferably 20 to 40% by mass.
- the compatibility between the structural unit derived from the alkyl ester (meth) acrylate and the compatibility between the fluoropolymer and the sulfonic acid group-containing polymer is deteriorated. Therefore, the polymer composition obtained tends to cause a layer separation phenomenon.
- the proportion of the structural unit derived from (a-3) other unsaturated monomer contained in component (a) is preferably 0 to 30% by mass. More preferably, it is 0 to 20% by mass. (A-3) If the proportion of structural units derived from other unsaturated monomers exceeds 30% by mass, the compatibility between the fluoropolymer and the sulfonic acid group-containing polymer is insufficient, and the resulting weight The combined composition tends to cause a layer separation phenomenon.
- the component (b) contained in the polymer composition of the present embodiment is a functional group-containing polymer.
- the component (b) includes (b-1) (meth) acrylic acid alkyl ester, (b-2) sulfonic acid group-containing unsaturated monomer, (b-3) amide group-containing unsaturated monomer, And (b—4) sulfonic acid group
- sulfonic acid group / amide group-containing unsaturated monomer refers to a compound (monomer) containing both a sulfonic acid group and an amide group in one molecule.
- (b-1) (Meth) acrylic acid alkyl ester includes, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, (meth) acrylic acid i— Propyl, n-butyl (meth) acrylate, i-butyl (meth) acrylate, n-amyl (meth) acrylate, i-amyl (meth) acrylate, n-hexyl (meth) acrylate, (meth) 2-ethylhexyl acrylate, n-octyl (meth) acrylate, (no) (meth) acrylate, n-decyl (meth) acrylate, ethylene glycol di (meth) acrylate, propylene glycol di ( Meta) Atalylate, Trimethylolpropane Tri (meth) Atylate, Pentaerythri
- Examples of the sulfonic acid group-containing unsaturated monomer include styrene sulfonic acid, methyloxybenzene sulfonic acid, allyloxybenzene sulfonic acid, allyl sulfonic acid, butyl sulfonic acid, meta Examples include yl sulfonic acid, 4 sulfobutyl metatalylate, and isoprene sulfonic acid, and salts thereof. Of these, 2-acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, aryloxybenzenesulfonic acid, and salts thereof are preferable. These sulfonic acid group-containing unsaturated monomers can be used singly or in combination of two or more.
- the (b-3) amide group-containing unsaturated monomer includes, for example, (meth) acrylamide, a-cloacrylamide, N, N, one methylene (meth) acrylamide, N, N, one Ethylene (meth) acrylamide, N hydroxymethyl (meth) acrylamide, N-2-hydroxyethyl (meth) acrylamide, N-2 hydroxypropyl (meth) acrylamide, N—3 hydroxypropyl (meth) acrylamide, ctronamide, Maleic acid diamide, fumaric acid diamide, Unsaturated carboxylic acid amides such as diacetone acrylamide; N-dimethylaminomethyl (meth) acrylamide, N-2-aminoethyl (meth) acrylamide, N-2-methylaminoethyl (meth) acrylamide, N-2- Tylaminoethyl (meth) acrylamide, N-2-dimethylaminoethyl
- Examples of the (b-4) sulfonic acid group / amide group-containing unsaturated monomer include 2-acrylamido-2-methylpropanesulfonic acid.
- the monomer component used to obtain the component (b) includes (b-1) (meth) acrylic acid alkyl ester, (b-2) sulfonic acid group-containing unsaturated monomer, (b — 3) Unsaturated monomer containing amide group, and (b-4) Other unsaturated monomer other than (b-4) sulfonic acid group 'amide group-containing unsaturated monomer.
- Examples of the (b-5) other unsaturated monomer that can be contained include, for example, the aromatic vinyl compounds, vinyl esters, and the like exemplified as the aforementioned (a-3) other unsaturated monomer. Examples thereof include halogenobulu compounds, conjugated genes, and ethylene.
- the proportion of the structural unit derived from the (b-1) (meth) acrylic acid alkyl ester contained in the component (b) is preferably 40 to 80% by mass. More preferably, it is 50 to 80% by mass.
- (b-1) When the proportion of the structural unit derived from the (meth) acrylic acid alkyl ester is less than 40% by mass, the compatibility between the fluorine-containing polymer and the sulfonic acid group-containing polymer is insufficient and obtained. The polymer composition tends to easily cause a layer separation phenomenon. On the other hand, if it exceeds 80% by mass, the volume swelling in the electrode slurry tends to be too large.
- the component (b) is (b-1) a structural unit derived from a (meth) acrylic acid alkyl ester, (b-2) a structural unit derived from a sulfonic acid group-containing unsaturated monomer, and (b — 5)
- a polymer composed of structural units derived from other unsaturated monomers hereinafter also referred to as “sulfonic acid group-containing polymer”
- sulfonic acid group-containing polymer a polymer composed of structural units derived from other unsaturated monomers
- the proportion of the structural unit derived from the sulfonic acid group-containing unsaturated monomer is preferably from 0.1 to 20% by mass, and more preferably from 0.1 to 18% by mass.
- the structural unit derived from (b-5) another unsaturated monomer contained in the sulfonic acid group-containing polymer.
- the ratio is preferably 0 to 40% by mass, more preferably 0 to 30% by mass, and still more preferably 0 to 20% by mass.
- B-5 When the proportion of structural units derived from other unsaturated monomers exceeds 40% by mass, the compatibility between the fluoropolymer and the sulfonic acid group-containing polymer is insufficient, and The combined composition tends to cause a layer separation phenomenon.
- the component (b) is a structural unit derived from (b-l) (meth) acrylic acid alkyl ester, (b-3) a structural unit derived from an amide group-containing unsaturated monomer, and b-5)
- a polymer having a structural unit strength derived from another unsaturated monomer hereinafter also referred to as “amide group-containing polymer”.
- amide group-containing polymer a polymer having a structural unit strength derived from another unsaturated monomer
- b-3) Amide group-containing The proportion of the structural unit derived from the unsaturated monomer is preferably 0.1 to 30% by mass, and more preferably 0.1 to 25% by mass. Particularly preferred is 1 to 20% by mass.
- component (b) is an amide group-containing polymer
- it is derived from (b-5) other unsaturated monomers contained in the amide group-containing polymer.
- the proportion of the structural unit is preferably 0 to 30% by mass, more preferably 0 to 25% by mass, and 0 to 20% by mass. % Is particularly preferred.
- B-5 When the proportion of structural units derived from other unsaturated monomers is more than 30% by mass, the compatibility between the fluoropolymer and the amide group-containing polymer is insufficient, and the resulting polymer The composition tends to easily cause a layer separation phenomenon.
- the component (b) is (b-1) a structural unit derived from a (meth) acrylic acid alkyl ester, (b-2) a structural unit derived from a sulfonic acid group-containing unsaturated monomer, ( b-3) a polymer composed of structural units derived from amide group-containing unsaturated monomers, and (b-5) structural units derived from other unsaturated monomers (hereinafter referred to as "first sulfonic acid").
- the proportion of the derived structural unit is preferably 0 to 15% by mass, and more preferably 0 to 10% by mass. Further, the proportion of the structural unit derived from the (b-3) amide group-containing unsaturated monomer contained in the first sulfonic acid group 'amide group-containing polymer is preferably 0 to 30% by mass. It is more preferably 0.1 to 25% by mass, and particularly preferably 0.1 to 20% by mass.
- (b 2) The proportion of the structural unit derived from the sulfonic acid group-containing unsaturated monomer exceeds 15% by mass, or (b-3) the structure derived from the amide group-containing unsaturated monomer If the ratio of the unit force exceeds S30% by mass, the viscosity tends to be too high during polymerization in an aqueous system, and the particles tend to coalesce together, making it difficult to obtain a good aqueous dispersion.
- component (b) is the first sulfonic acid group'amide group-containing polymer
- it is contained in the first sulfonic acid group / amide group-containing polymer (b 5)
- the proportion of the structural unit derived from the unsaturated monomer is preferably 0 to 30% by mass, more preferably 0 to 25% by mass, and more preferably 0 to 20% by mass. Particularly preferred.
- B-5 When the proportion of structural units derived from other unsaturated monomers exceeds 30% by mass, the compatibility between the fluorine-based polymer and the functional group-containing polymer is insufficient, and thus obtained. The polymer composition tends to cause a layer separation phenomenon.
- (b-2) a structural unit derived from a sulfonic acid group-containing unsaturated monomer contained in the first sulfonic acid group 'amide group-containing polymer, and (b-3) an amide group
- the total proportion of structural units derived from the contained unsaturated monomer ((b-2) + (b-3)) is 0.1% by mass or more. It is more preferable that it is 0.4% or more by mass Particularly preferred.
- (b-2) + (b-3) less than 0.1% by mass, the chemical stability of the particles is insufficient during polymerization in an aqueous system, making it difficult to obtain a good aqueous dispersion. It is in.
- (b) component is a structural unit derived from (b-1) (meth) acrylic acid alkyl ester, (b-4) a structural unit derived from a sulfonic acid group / amide group-containing unsaturated monomer, And (b-5) a polymer composed of structural units derived from other unsaturated monomers (hereinafter also referred to as “second sulfonic acid group'amide group-containing polymer”).
- the proportion of the structural unit derived from the sulfonic acid group / amide group-containing unsaturated monomer contained in the second sulfonic acid group-amide group-containing polymer is 0.1-20% by mass. It is particularly preferably 0.1 to 18% by mass, and particularly preferably 0.1 to 15% by mass.
- the component (b) is a second sulfonic acid group'amide group-containing polymer
- it is contained in the second sulfonic acid group / amide group-containing polymer (b 5)
- the proportion of the structural unit derived from the unsaturated monomer is preferably 0 to 30% by mass, more preferably 0 to 25% by mass, and more preferably 0 to 20% by mass. Particularly preferred.
- B-5 When the proportion of structural units derived from other unsaturated monomers exceeds 30% by mass, the compatibility between the fluorine-based polymer and the functional group-containing polymer is insufficient, and thus obtained.
- the polymer composition tends to cause a layer separation phenomenon.
- the component (a) and the component (b) are combined to form a composite polymer, and the cycle characteristics with less capacity loss during high-speed discharge are further excellent. It is preferable because it can produce a secondary battery and has better adhesion to the current collector! / ⁇ .
- the toluene insoluble content contained in this composite polymer is usually 20 to: LOO% by mass, and preferably 30 to 90% by mass. When the toluene-insoluble content in the composite polymer is less than 20% by mass, the polymer composition containing this composite polymer is used.
- the polymer flow may occur in the drying process after coating, and the electrode active material may be excessively covered, which may inhibit the electrode conductivity and cause overvoltage. is there.
- the durability against the electrolytic solution is likely to decrease, and the electrode active material may be easily detached from the current collector.
- the melting point (Tm) of the composite polymer is preferably 170 ° C or less, more preferably 0 to 110 ° C, and even more preferably 30 to 60 ° C.
- Tm melting point
- the above-mentioned composite polymer can be favorably prepared by, for example, an emulsion polymerization method. Specifically, after the component (a) is obtained by emulsion polymerization, the component (a) containing the (meth) acrylic acid alkyl ester and the sulfonic acid group-containing unsaturated monomer is used as a seed. Emulsion polymerization may be performed.
- the ratio of the component (a) to the total 100 parts by mass of the component (a) and the component (b) is preferably 3 to 60 parts by mass, and more preferably 10 to 50 parts by mass.
- proportion of component (a) is less than 3 parts by mass, chemical resistance and the like tend to decrease.
- binder performance tends to be lowered, and the capacity is lowered and the cycle characteristics are deteriorated during high-speed discharge.
- the polymer composition of this embodiment preferably further contains (c) an organic solvent (hereinafter also referred to as “component (c)”).
- This component (c) preferably has a boiling point (bp) at 1 atm of 100 ° C or higher, more preferably 115 ° C or higher, and more preferably 130 ° C or higher. It is particularly preferred.
- Specific examples of the component (c) include toluene, N-methylpyrrolidone (NMP), methyl isobutyl ketone (MIBK), cyclohexanone, dimethyl sulfoxide (DMSO), dimethylformamide (DMF) and the like. Of these, NMP, DMSO, and DMF are preferable.
- the component (a) and the component (b) are combined to form the above-mentioned combined polymer! /
- the composite polymer is preferably dissolved or dispersed in the component (C).
- the number average particle size of the particles constituting the composite polymer is preferably 0.02 to 2 m.
- Mashi 0.05-: L 8 m is more preferred 0.1-1 to 1.5 m is particularly preferred.
- the “number average particle diameter” in the present specification is a value measured by a dynamic light scattering method.
- the polymer composition of the present embodiment can be produced, for example, according to the method shown below. First, an aqueous dispersion containing the component (a) and the component (b) and the component (c) are mixed to obtain a mixed composition raw material. Next, the polymer composition of the present embodiment containing an organic solvent can be produced by removing moisture from the obtained mixed composition raw material.
- the polymer composition of the present embodiment can also be produced, for example, according to the following method.
- the polymer composition of the present embodiment can be produced by mixing the component (a) and the component (b) obtained by removing moisture together with the component (c) as necessary.
- the method for removing the water is not particularly limited, and specific examples include a distillation method, an ultrafiltration method, a fractional filtration method, a dispersion medium phase conversion method, and the like.
- the proportion of water contained in the polymer composition of the present embodiment is preferably 2.0% by mass or less, more preferably 1.5% by mass or less. It is particularly preferably 0% by mass or less. If the moisture content is more than 2.0% by mass, it may adversely affect the active material in the slurry and cause a decrease in battery capacity.
- the polymer composition of the present embodiment can be suitably used as a binder for secondary battery electrodes, a binder for capacitor electrodes, etc., taking advantage of the characteristics.
- the secondary battery electrode paste of the present embodiment contains the polymer composition described above and an electrode active material.
- the secondary battery electrode paste of the present embodiment is a polymer composition and a battery. It can be prepared by mixing a polar active material with various additives added as necessary.
- the secondary battery electrode paste of the present embodiment preferably contains the polymer composition in a solid content of 0.1 to 0.1 parts by mass with respect to 100 parts by mass of the electrode active material. It is more preferable to contain 0.5 to 10 parts by mass, and it is particularly preferable to contain 1 to 10 parts by mass. If the amount of the polymer composition is less than 0.1 parts by mass, good adhesion tends to be not obtained. On the other hand, if it exceeds 10 parts by mass, the internal resistance tends to be too large and affect the battery characteristics.
- various kneaders, bead mills, high-pressure homogenizers, and the like can be used.
- a viscosity adjusting polymer that can be dissolved in an organic solvent to be used conductive carbon such as graphite, Conductive materials such as metal powder can be added.
- the viscosity adjusting polymer that can be dissolved in the organic solvent to be used include NBU as the organic solvent to be used.
- NBU the organic solvent to be used.
- ethylene butal alcohol, polybut alcohol, polybutpyrrolidone, polyacrylamide, and polymethylmethacrylate examples thereof include talylate and polyvinylidene fluoride.
- a hydrogen storage alloy powder is preferably used in an aqueous battery, for example, a nickel metal hydride battery. More specifically, it is based on MmNi and a part of Ni is replaced with elements such as Mn, Al, Co, etc.
- Mm represents misch metal, which is a mixture of rare earth elements.
- the electrode active material is preferably a powder having a particle diameter of 3 to 400 m and having passed through 100 mesh.
- non-aqueous batteries for example, MnO, MoO, V 2 O
- Inorganic compounds such as Ni O, TiS, TiS, MoS, FeS, CuF, NiF; Fluorocarbon
- Graphite vapor-grown carbon fiber and Z or pulverized product thereof, PAN-based carbon fiber and Z or pulverized product thereof, pitch-based carbon fiber and Z or pulverized product thereof; polyacetylene, poly-p- Examples thereof include conductive polymers such as phenylene.
- Li CoO, Li NiO, including lithium ions such as Li Co Sn O and Li Co Ni O The use of a complex oxide is preferable because it allows assembly in both the positive and negative electrodes in a discharged state.
- Examples of the negative electrode active material include carbon fluoride, graphite, vapor-grown carbon fiber and Z or a pulverized product thereof, PAN-based carbon fiber and Z or a pulverized product thereof, pitch-based carbon fiber and Z or
- Preferable examples include carbon materials such as pulverized materials, conductive polymers such as polyacetylene and poly-p-phenylene, and amorphous compounds composed of compounds such as tin oxide and fluorine.
- a graphite material such as natural graphite, artificial graphite, or graphite-mesophase carbon having a high degree of graphitization is used, a battery having good charge / discharge cycle characteristics and a high capacity can be obtained.
- the average particle size of the carbonaceous material is reduced current efficiency, reduced paste stability, increased interparticle resistance in the coating film of the obtained electrode, etc. Is preferably 0.1 to 50; ⁇ ⁇ is preferably 1 to 45 / ⁇ ⁇ , more preferably 3 to 40 m.
- the secondary battery electrode of the present embodiment includes a current collector and an electrode layer formed by applying and drying the above-described secondary battery electrode paste on the surface of the current collector.
- Examples of the current collector include water-based batteries such as Ni mesh, Ni-plated punching metal, expanded metal, wire mesh, foam metal, and reticulated metal fiber sintered body.
- members such as aluminum foil and copper foil, can be mentioned as a suitable example, for example.
- the electrode layer is formed by applying the above-described paste for a secondary battery electrode to a predetermined thickness on at least one surface of the current collector, followed by heating and drying, the second embodiment of the present embodiment can be used.
- a secondary battery electrode can be obtained.
- a method using any coater head such as a reverse roll method, a comma bar method, a gravure method, an air knife method, etc. can be employed. .
- a blower dryer for example, in addition to a method of leaving it to dry naturally, a blower dryer, a hot air dryer, Red A drying method using an external wire heater or a far-infrared heater can be employed.
- the drying temperature is usually preferably 20 to 250 ° C, more preferably 130 to 170 ° C. Further, the drying time is preferably 1 to 120 minutes, more preferably 5 to 60 minutes.
- the secondary battery electrode of the present embodiment can be suitably used as an electrode for either an aqueous battery or a non-aqueous battery. Excellent characteristics can be achieved with a nickel-metal hydride battery positive electrode as an aqueous battery and an alkaline secondary battery positive electrode or a lithium ion battery positive electrode as a non-aqueous battery.
- the non-aqueous electrolyte solution an electrolyte in which an electrolyte is dissolved in a non-aqueous solvent is usually used.
- the electrolyte is not particularly limited, but examples of alkaline secondary batteries include LiCIO, LiBF, LiAsF
- Examples of the solvent used in the electrolytic solution include ethers, ketones, latatones, nitriles, amines, amides, sulfur compounds, chlorinated hydrocarbons, esters, carbonates, Nitro compounds, phosphate ester compounds, sulfolane compounds, and the like can be used. Among these, ethers, ketones, nitriles, chlorinated hydrocarbons, carbonates, and sulfolane compounds are preferable.
- tetrahydrofuran 2-methyltetrahydrofuran, 1,4 dioxane, anisole, monoglyme, diglyme, triglyme, acetonitrile, propionitrile, 4-methyl-2-pentanone, butyronitrile, valeronitrile, benzonitrile, 1, 2 -Diclonal ethane, y butyrolatatane, dimethoxetane, methyl formate, propylene carbonate, ethylene carbonate, dimethylformamide, dimethyl sulfoxide, dimethylthioformamide, sulfolane, 3-methyl monosulfolane, trimethyl phosphate, or triethyl phosphate Alternatively, a mixed solvent thereof or the like can be given.
- a 5N or higher potassium hydroxide aqueous solution is usually used as the electrolyte for aqueous batteries.
- a battery is configured using components such as a separator, a terminal, and an insulating plate.
- the structure of the battery is not particularly limited, but the positive electrode, the negative electrode, and the required one.
- a paper type battery having a single layer or multiple layers of a separator, or a positive electrode, a negative electrode, and, if necessary, a cylindrical battery in which a separator is wound in a roll shape can be exemplified.
- the secondary battery manufactured using the secondary battery electrode of the present embodiment can be suitably used for, for example, AV equipment, OA equipment, communication equipment, and the like.
- Electrode coating solution 5 parts of the rack and 8 parts of the binder composition were mixed and stirred in NMP to obtain an electrode coating solution.
- the obtained electrode coating solution was applied onto an aluminum foil having a thickness of 50 m so that the coating amount was 200 gZm 2 and dried to prepare a positive electrode having a total thickness of 110 / zm.
- a negative electrode a trade name “Pioxel A100” (manufactured by Bionics) was used, and a lithium ion secondary battery was used.
- a test piece having a width of 2 cm ⁇ a length of 10 cm was cut out from the battery electrode (positive electrode) produced as described above.
- the surface of the test piece on the electrode layer side was attached to an aluminum plate using a double-sided tape.
- a 18 mm wide tape (trade name “Cello Tape (registered trademark)” (made by Nichiban Co., Ltd.) QIS Z1522) is attached to the surface of the current collector of the test piece, and the tape is applied at a speed of 50 mmZmin in the 90 ° direction
- the strength (gZcm) when peeled was measured five times, and the average value was calculated as the peel strength (gZcm).
- [0086] [Capacity maintenance ratio]: A lithium ion secondary battery manufactured as described above was charged to 4 V by a constant current method of 0.2 C in a 25 ° C. atmosphere and then discharged to 3 V. The discharge was repeated 300 times. Discharge capacity at the 5th cycle (mAhZg (discharge capacity per lg of active material)), Measure the discharge capacity (mAh / g) after 100, 200, and 300 cycles, and use the following formula (1) to calculate the capacity retention rate (%) after 100, 200, and 300 cycles. Calculated.
- mAhZg discharge capacity per lg of active material
- Capacity retention rate (%) ⁇ (Discharge capacity after elapse of a predetermined cycle) / (Discharge capacity at the 5th cycle M X 100 (1)
- [0087] 100 g of the obtained aqueous dispersion of the composite polymer is sequentially filtered through a 120 mesh, 200 mesh, 300 mesh, and 500 mesh wire mesh, and a residue is formed on each wire mesh. The remaining agglomerates were dried using a hot air dryer at 105 ° C., and mass measurement was performed to determine the amount of agglomerates generated in the entire polymer. Next, the polymerization stability was evaluated according to the following criteria.
- Ratio of aggregated mass is less than 0.2% by mass of the obtained polymer (solid content).
- ⁇ Ratio of aggregated mass is 0.2% by mass or more of the total obtained polymer (solid content). Less than 0.5 mass%
- the ratio of the aggregate is 0.5% by mass or more of the total amount of the obtained polymer (solid content)
- the autoclave with an internal volume of about 6 liters equipped with an electromagnetic stirrer was sufficiently purged with nitrogen, deoxygenated pure water (2.5 liters), and perfluorodecanoic acid ammonium as an emulsifier. 25 g was charged and the temperature was raised to 60 ° C. while stirring at 350 rpm. Next, mixed gas having 44.2% strength of Futsui-biridene (VDF) and 55.8% propylene hexafluoride (HFP) was charged until the internal pressure reached 20 kgZcm 2 G. Thereafter, 25 g of Freon 113 solution containing 20% of diisopropyl peroxydicarbonate as a polymerization initiator was injected using nitrogen gas to initiate polymerization.
- VDF Futsui-biridene
- HFP propylene hexafluoride
- Examples 2 to 4 A polymer composition (Examples 2 to 4) was obtained in the same manner as in Example 1 except that the formulation shown in Table 1 was used.
- Table 1 shows the evaluation results of the adhesion of the obtained polymer composition to the metal foil. Further, Table 1 shows the measurement results of the capacity retention rate of the lithium secondary battery produced using the obtained polymer composition.
- the abbreviations of the monomer components (components (a) and (b)) in the formulation of Table 1 are as shown below.
- VDF vinylidene fluoride
- DAAM Diacetone acrylamide
- ATBS 2-acrylamide-2-methylpropanesulfonic acid
- NASS Sodium styrene sulphonate
- GMA Glycidylmetatalylate
- NMP corresponding to 900 parts was added to the latex with respect to 100 parts (in terms of solid content) of the fluoropolymer latex obtained by the same operation as in Example 1 described above.
- a rotary evaporator with a water temperature set to 85 ° C water was distilled off under reduced pressure conditions to obtain an NMP solution of a fluoropolymer.
- the reaction was stopped by cooling to obtain an aqueous dispersion of a sulfonic acid group-containing polymer.
- aqueous dispersion of a sulfonic acid group-containing polymer 100 parts (in terms of solid content) of the resulting aqueous dispersion of the sulfonic acid group-containing polymer, 900 parts of NMP was added to the aqueous dispersion.
- a rotary evaporator with a water temperature set to 85 ° C., water was distilled off under reduced pressure to obtain an NMP solution of a sulfonic acid group-containing polymer.
- the NMP solution of the obtained fluoropolymer and the NMP solution of the sulfonic acid group-containing polymer were blended so as to be equal to the ratio contained in the polymer composition obtained in Example 1.
- a polymer composition (Example 5) containing a polymer and a sulfonic acid group-containing polymer was obtained.
- the obtained polymer composition was subjected to various evaluation tests.
- Table 1 shows the evaluation results of the adhesion of this polymer composition to the metal foil.
- Table 1 shows the measurement results of the capacity retention rate of a lithium secondary battery produced using this polymer composition.
- Example 1 Except for the formulation shown in Table 1, the same operation as in Example 1 described above, A polymer composition (Comparative Example 1) was obtained. Table 1 shows the evaluation results of the adhesion of the obtained polymer composition to the metal foil. Further, Table 1 shows the measurement results of the capacity retention rate of the lithium secondary battery produced using the obtained polymer composition.
- a fluoropolymer latex was obtained in the same manner as in Example 1 except that the formulation shown in Table 1 was used. NMP corresponding to 900 parts was added to the latex with respect to 100 parts of latex of the obtained fluoropolymer (in terms of solid content). Using a rotary evaporator with a water temperature set at 85 ° C., water was distilled off under reduced pressure conditions to obtain an NMP solution of a fluoropolymer. The residual water content of the obtained NMP solution was measured by a Karl Fischer reagent titration method and found to be 1.3%. The obtained NMP solution was subjected to various evaluation tests. Table 1 shows the evaluation results of the adhesion of this NMP solution to the metal foil. Furthermore, Table 1 shows the measurement results of the capacity retention rate of lithium secondary batteries fabricated using NMP solutions.
- Table 1 shows the measurement results of the capacity retention rate of the lithium secondary battery produced using the obtained polymer composition.
- a secondary battery that is excellent in cycle characteristics with little capacity loss during high-speed discharge and that can be suitably used for AV equipment, OA equipment, communication equipment, and the like. can do.
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Abstract
Description
Claims
Priority Applications (5)
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JP2007556937A JP5365001B2 (ja) | 2006-02-02 | 2007-02-02 | 重合体組成物、二次電池電極用ペースト、及び二次電池電極 |
US12/278,095 US20090239147A1 (en) | 2006-02-02 | 2007-02-02 | Polymer composition, paste for use in electrode for secondary battery, and electrode for secondary battery |
CN2007800043414A CN101379131B (zh) | 2006-02-02 | 2007-02-02 | 聚合物组合物、二次电池电极用糊以及二次电池电极 |
KR1020087020146A KR101311583B1 (ko) | 2006-02-02 | 2007-02-02 | 중합체 조성물, 이차 전지 전극용 페이스트 및 이차 전지 전극 |
US12/729,571 US20100173196A1 (en) | 2006-02-02 | 2010-03-23 | Polymer composition, paste for use in electrode for secondary battery, and electrode for secondary battery |
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CN (1) | CN101379131B (ja) |
TW (1) | TW200740913A (ja) |
WO (1) | WO2007088979A1 (ja) |
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JPWO2007088979A1 (ja) | 2009-06-25 |
KR101311583B1 (ko) | 2013-09-26 |
CN101379131A (zh) | 2009-03-04 |
TW200740913A (en) | 2007-11-01 |
KR20080097425A (ko) | 2008-11-05 |
US20090239147A1 (en) | 2009-09-24 |
JP5365001B2 (ja) | 2013-12-11 |
CN101379131B (zh) | 2011-10-05 |
US20100173196A1 (en) | 2010-07-08 |
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