CN110137497B - Negative electrode binder, preparation method thereof and lithium ion battery - Google Patents
Negative electrode binder, preparation method thereof and lithium ion battery Download PDFInfo
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- CN110137497B CN110137497B CN201910391134.3A CN201910391134A CN110137497B CN 110137497 B CN110137497 B CN 110137497B CN 201910391134 A CN201910391134 A CN 201910391134A CN 110137497 B CN110137497 B CN 110137497B
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- acrylate
- polycarbonate
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- monomer
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 32
- 239000011883 electrode binding agent Substances 0.000 title claims description 21
- 238000002360 preparation method Methods 0.000 title claims description 12
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 54
- 239000004417 polycarbonate Substances 0.000 claims abstract description 54
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 13
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims abstract description 11
- 239000000839 emulsion Substances 0.000 claims description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- 239000000178 monomer Substances 0.000 claims description 49
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 45
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 claims description 45
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 45
- 229920000058 polyacrylate Polymers 0.000 claims description 43
- 238000003756 stirring Methods 0.000 claims description 43
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 37
- 239000008367 deionised water Substances 0.000 claims description 33
- 229910021641 deionized water Inorganic materials 0.000 claims description 33
- 239000007864 aqueous solution Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 25
- 239000003995 emulsifying agent Substances 0.000 claims description 24
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 22
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 20
- 238000006116 polymerization reaction Methods 0.000 claims description 19
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 16
- 230000001804 emulsifying effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 13
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 13
- 239000003999 initiator Substances 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 11
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 11
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 claims description 10
- -1 polyoxyethylene octyl phenol Polymers 0.000 claims description 9
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 7
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 6
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 6
- 239000006172 buffering agent Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 6
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 5
- 239000011884 anode binding agent Substances 0.000 claims description 5
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 4
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- HGXJDMCMYLEZMJ-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy 2,2-dimethylpropaneperoxoate Chemical compound CC(C)(C)OOOC(=O)C(C)(C)C HGXJDMCMYLEZMJ-UHFFFAOYSA-N 0.000 claims description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- CCJAYIGMMRQRAO-UHFFFAOYSA-N 2-[4-[(2-hydroxyphenyl)methylideneamino]butyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCCN=CC1=CC=CC=C1O CCJAYIGMMRQRAO-UHFFFAOYSA-N 0.000 claims description 3
- ZACVGCNKGYYQHA-UHFFFAOYSA-N 2-ethylhexoxycarbonyloxy 2-ethylhexyl carbonate Chemical compound CCCCC(CC)COC(=O)OOC(=O)OCC(CC)CCCC ZACVGCNKGYYQHA-UHFFFAOYSA-N 0.000 claims description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 3
- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 claims description 3
- CDOUZKKFHVEKRI-UHFFFAOYSA-N 3-bromo-n-[(prop-2-enoylamino)methyl]propanamide Chemical compound BrCCC(=O)NCNC(=O)C=C CDOUZKKFHVEKRI-UHFFFAOYSA-N 0.000 claims description 3
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 claims description 3
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims description 3
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 claims description 3
- IGFHQQFPSIBGKE-UHFFFAOYSA-N 4-nonylphenol Chemical compound CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 3
- NQSLZEHVGKWKAY-UHFFFAOYSA-N 6-methylheptyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C(C)=C NQSLZEHVGKWKAY-UHFFFAOYSA-N 0.000 claims description 3
- HETCEOQFVDFGSY-UHFFFAOYSA-N Isopropenyl acetate Chemical compound CC(=C)OC(C)=O HETCEOQFVDFGSY-UHFFFAOYSA-N 0.000 claims description 3
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 239000012874 anionic emulsifier Substances 0.000 claims description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 3
- 239000000872 buffer Substances 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 3
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 3
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 3
- RNTIBYGPJVJCCJ-UHFFFAOYSA-N n,n-dimethylmethanamine;ethyl 2-methylprop-2-enoate Chemical compound CN(C)C.CCOC(=O)C(C)=C RNTIBYGPJVJCCJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000012875 nonionic emulsifier Substances 0.000 claims description 3
- 150000002978 peroxides Chemical class 0.000 claims description 3
- 125000004344 phenylpropyl group Chemical group 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 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 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims 1
- 239000011230 binding agent Substances 0.000 abstract description 22
- 238000003860 storage Methods 0.000 abstract description 10
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 230000001351 cycling effect Effects 0.000 abstract description 2
- 238000007086 side reaction Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000004945 emulsification Methods 0.000 description 20
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 9
- 238000011049 filling Methods 0.000 description 8
- 238000010992 reflux Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003013 cathode binding agent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a binder for a lithium ion battery, which belongs to the technical field of lithium ion batteries and has the following specific technical scheme: the binder for the lithium ion battery is polycarbonate modified acrylate, the polycarbonate modified acrylate comprises polycarbonate and acrylate, and the volume percentage of the polycarbonate is 5-15%. The polycarbonate modified acrylate adhesive has better stability at high temperature, is not easy to generate gas by side reaction with electrolyte, and improves the high-temperature storage performance of the battery. The low-temperature performance of the battery cell can be greatly improved no matter the battery cell is used alone or mixed with SBR; and compared with an acrylate binder, the high-temperature storage performance and the cycling stability of the battery are obviously better.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative electrode binder, a preparation method of the negative electrode binder and a lithium ion battery.
Background
Since the lithium ion battery enters the market, the lithium ion battery is widely applied due to the advantages of long service life, large specific capacity, no memory effect and the like. The lithium ion battery used at low temperature has the problems of low capacity, serious attenuation, poor cycle rate performance, obvious lithium precipitation phenomenon, imbalance of lithium desorption and intercalation and the like. However, as the application field is continuously expanded, the restriction caused by the poor low-temperature performance of the lithium ion battery is increasingly obvious.
The lithium ion battery discharge capacity at-20 ℃ is reported to be only about 31.5% of that at room temperature. The working temperature of the traditional lithium ion battery is between-20 and +55 ℃. However, in the fields of aerospace, war industry, electric vehicles and the like, the battery is required to work normally at the temperature of-40 ℃. Therefore, the improvement of the low-temperature property of the lithium ion battery is of great significance.
The binder also has a great influence on the performance of the battery, in addition to its function of binding the electrodes. Compared with the traditional Styrene Butadiene Rubber (SBR) binder, the acrylate binder contains carboxyl functional groups, so that the lithium ion conductivity is improved, the internal resistance of the battery is reduced, and the low-temperature electrical property of the battery is improved; meanwhile, under the corrosion of the electrolyte at high temperature, the high-temperature storage of the battery is easy to generate gas and swell, so that the high-temperature storage of the battery is invalid.
Disclosure of Invention
The invention aims to provide a negative electrode binder, which solves the problem of failure of an acrylate binder in high-temperature storage and ensures that the low-temperature performance of a battery is not affected.
The second purpose of the invention is to provide a preparation method of the negative electrode binder.
A third object of the present invention is to provide a lithium ion battery containing the negative electrode binder.
In order to achieve the purpose, the invention adopts the following technical scheme:
the negative electrode binder is polycarbonate modified acrylate, the polycarbonate modified acrylate comprises polycarbonate and polyacrylate, and the volume percentage of the polycarbonate is 5-15%.
Further, the polycarbonate has a structural formula (I):
wherein: r is one or two of benzyl, phenethyl, phenylpropyl and p-methyl-ethyl.
The preparation method of the negative electrode binder specifically comprises the following steps:
the method comprises the following steps: adding an emulsifier and an initiator into deionized water, stirring until the emulsifier and the initiator are completely dissolved, adding an acrylate monomer, a bonding monomer and a crosslinking monomer, and stirring and emulsifying to obtain a monomer pre-emulsion;
step two: adding an emulsifier, a buffering agent and deionized water into a reaction kettle, stirring until the emulsifier, the buffering agent and the deionized water are completely dissolved, and placing the mixture into a water bath at 50 ℃; dropwise adding an initiator aqueous solution and the monomer pre-emulsion into a reaction kettle, heating to 85 ℃ in a water bath, carrying out polymerization reaction for 2 hours, cooling to room temperature, and adjusting the pH value to 7-9 with ammonia water to obtain a polyacrylate emulsion;
step three: adding polycarbonate into the polyacrylate emulsion, and continuously stirring for 2h to completely mix the polycarbonate and the polyacrylate to obtain polycarbonate modified polyacrylate, wherein the volume percentage of the polycarbonate is 5-15%.
Further, the acrylate monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA), isooctyl acrylate (2-EHA), vinyl acetate (VAc), styrene (St), Methyl Methacrylate (MMA), methyl acrylate, ethyl methacrylate, butyl methacrylate, isooctyl methacrylate, methyl vinyl acetate, methacrylamide and methyl styrene; the bonding monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA) and isooctyl acrylate (2-EHA); the crosslinking monomer is one or more of methacrylic acid, acrylic acid, hydroxyethyl acrylate, acrylonitrile, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, glycidyl methacrylate, maleic anhydride, N-hydroxymethyl acrylamide and trimethylamine ethyl methacrylate; the emulsifier is one or more of anionic emulsifier, cationic emulsifier, amphoteric emulsifier and nonionic emulsifier; the initiator is one or more of lauroyl peroxide, diisopropyl peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, tert-butyl peroxypivalate, 3, 5-trimethylhexanoyl peroxide, azo compounds such as alpha, alpha' -azobisisobutyronitrile and the like, ammonium persulfate and potassium persulfate; the buffer is sodium bicarbonate.
Further, the emulsifier is one or more of sodium dodecyl sulfate, OP-10 (polyoxyethylene octyl phenol ether-10), sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, dioctyl sodium sulfosuccinate, p-nonylphenol polyoxyethylene (n ═ 4-40) ether and polyoxyethylene monolaurate.
The lithium ion battery containing the negative electrode binder comprises the negative electrode binder.
The invention has the beneficial effects that: the polycarbonate modified polyacrylate is used as the lithium ion battery cathode binder, and the polycarbonate structure is similar to the structure of the existing carbonate electrolyte solvent system, so that the compatibility of the polycarbonate modified polyacrylate with the electrolyte is better, the complexing effect on lithium ions and the decomplexing effect under the action of an electric field can be improved, the ionic conductivity is greatly improved, the electrochemical impedance and the direct current impedance of the battery are reduced, and the charge and discharge capacity of the battery at low temperature is greatly improved; meanwhile, compared with the acrylate binder, the polycarbonate modified acrylate binder has better stability at high temperature, is not easy to generate gas by side reaction with electrolyte, and improves the high-temperature storage performance of the battery. The low-temperature performance of the battery cell can be greatly improved no matter the battery cell is used alone or mixed with SBR; compared with acrylate binder, the high-temperature storage performance and the cycling stability of the battery using the polycarbonate modified acrylate binder are obviously better.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and modifications and equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit of the technical solutions of the present invention, and the technical solutions of the present invention are covered by the protection scope of the present invention.
Detailed description of the invention
The negative electrode binder is polycarbonate modified acrylate, the polycarbonate modified acrylate comprises polycarbonate and polyacrylate, and the volume percentage of the polycarbonate is 5-15%.
Further, the polycarbonate has a structural formula (I):
wherein: r is one or two of benzyl, phenethyl, phenylpropyl and p-methyl-ethyl.
The preparation method of the anode binder is characterized by comprising the following steps of:
the method comprises the following steps: adding an emulsifier and an initiator into deionized water, stirring until the emulsifier and the initiator are completely dissolved, adding an acrylate monomer, a bonding monomer and a crosslinking monomer, and stirring and emulsifying to obtain a monomer pre-emulsion;
step two: adding an emulsifier, a buffering agent and deionized water into a reaction kettle, stirring until the emulsifier, the buffering agent and the deionized water are completely dissolved, and placing the mixture into a water bath at 50 ℃; dropwise adding an initiator aqueous solution and the monomer pre-emulsion into a reaction kettle, heating to 85 ℃ in a water bath, carrying out polymerization reaction for 2 hours, cooling to room temperature, and adjusting the pH value to 7-9 with ammonia water to obtain a polyacrylate emulsion;
step three: adding polycarbonate into the polyacrylate emulsion, and continuously stirring for 2h to completely mix the polycarbonate and the polyacrylate to obtain polycarbonate modified polyacrylate, wherein the volume percentage of the polycarbonate is 5-15%.
The pre-emulsification of the monomer in the first step and the preparation of the polyacrylate emulsion in the second step belong to the prior art, namely, the pre-emulsification method of the monomer and the preparation method of the polyacrylate emulsion in the prior art are both suitable for the invention.
Further, the acrylate monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA), isooctyl acrylate (2-EHA), vinyl acetate (VAc), acrylamide, styrene (St), Methyl Methacrylate (MMA), methyl acrylate, ethyl methacrylate, butyl methacrylate, isooctyl methacrylate, methyl vinyl acetate, methacrylamide and methyl styrene; the bonding monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA) and isooctyl acrylate (2-EHA); the crosslinking monomer is one or more of methacrylic acid, acrylic acid, hydroxyethyl acrylate, acrylonitrile, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, glycidyl methacrylate, maleic anhydride, N-hydroxymethyl acrylamide and trimethylamine ethyl methacrylate; the emulsifier is one or more of anionic emulsifier, cationic emulsifier, amphoteric emulsifier and nonionic emulsifier; the initiator is one or more of lauroyl peroxide, diisopropyl peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, tert-butyl peroxypivalate, 3, 5-trimethylhexanoyl peroxide, azo compounds such as alpha, alpha' -azobisisobutyronitrile and the like, ammonium persulfate and potassium persulfate; the buffer is sodium bicarbonate.
Further, the emulsifier is one or more of sodium dodecyl sulfate, OP-10 (polyoxyethylene octyl phenol ether-10), sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, dioctyl sodium sulfosuccinate, p-nonylphenol polyoxyethylene (n ═ 4-40) ether and polyoxyethylene monolaurate;
the lithium ion battery containing the negative electrode binder comprises the negative electrode binder in a negative electrode of the lithium ion battery.
Example 1
A preparation method of the negative electrode binder comprises the following steps:
the method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; 215g of methacrylic acid, 215g of butyl acrylate and 215g of methyl methacrylate are sequentially added into a pre-emulsification kettle, and the pre-emulsification liquid of the monomers is obtained after stirring and emulsification for 15 min; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser pipe, starting stirring to dissolve the sodium dodecyl sulfate, the sodium dodecyl sulfate and the deionized water, and placing the mixture into a water bath at 50 ℃; dissolving 1.07g of ammonium persulfate in 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an aqueous solution of ammonium persulfate, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 1.
Assembling the battery: the polymer lithium ion battery is assembled by using b1 as a negative plate binder in a manner known in the industry and is recorded as C1.
Example 2:
a preparation method of the negative electrode binder comprises the following steps:
the method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; 215g of methacrylic acid, 215g of butyl acrylate, 202.1g of methyl methacrylate and 12.9g of acrylonitrile are sequentially added into a pre-emulsification kettle, and the mixture is stirred and emulsified for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser pipe, starting stirring to dissolve the sodium dodecyl sulfate, the sodium dodecyl sulfate and the deionized water, and placing the mixture into a water bath at 50 ℃; dissolving 1.07g of ammonium persulfate in 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 2.
Assembling the battery: the polymer lithium ion battery is assembled by using b2 as a negative plate binder in a manner known in the industry and is recorded as C2.
Example 3:
a preparation method of the negative electrode binder comprises the following steps:
the method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; sequentially adding 190g of methacrylic acid, 215g of butyl acrylate, 227.1g of methyl methacrylate and 12.9g of acrylonitrile into a pre-emulsification kettle, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 3.
Assembling the battery: the polymer lithium ion battery is assembled by using b3 as a negative plate binder in a manner known in the industry and is recorded as C3.
Example 4:
the method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10 and 7.2g of sodium dodecyl sulfate are sequentially added into a three-neck flask (a pre-emulsification kettle); 2.13g of ammonium persulfate, then 300g of deionized water are added, and stirring is started to completely dissolve the ammonium persulfate; adding 215g of methacrylic acid, 215g of butyl acrylate, 151g of methyl methacrylate and 64g of styrene into a pre-emulsification kettle in sequence, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 4.
Assembling the battery: the polymer lithium ion battery is assembled by using b4 as a negative plate binder in a manner known in the industry and is recorded as C4.
Example 5
The method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10 and 7.2g of sodium dodecyl sulfate are sequentially added into a three-neck flask (a pre-emulsification kettle); 2.13g of ammonium persulfate, then 300g of deionized water are added, and stirring is started to completely dissolve the ammonium persulfate; adding 215g of isooctyl acrylate, 215g of butyl acrylate, 151g of methyl methacrylate and 64g of styrene into a pre-emulsification kettle in sequence, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 5.
Assembling the battery: the polymer lithium ion battery is assembled by using b5 as a negative plate binder in a manner known in the industry and is recorded as C5.
Example 6
The method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; sequentially adding 100g of ethyl acrylate, 115g of isooctyl acrylate, 215g of butyl acrylate, 151g of methyl methacrylate and 64g of styrene into a pre-emulsification kettle, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 6.
Assembling the battery: the polymer lithium ion battery is assembled by using b6 as a negative plate binder in a manner known in the industry and is recorded as C6.
Example 7
The method comprises the following steps: pre-emulsifying monomers: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; sequentially adding 100g of hydroxyethyl methacrylate, 115g of isooctyl acrylate, 215g of butyl acrylate, 151g of methyl methacrylate and 64g of styrene into a pre-emulsification kettle, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 7.
Assembling the battery: the polymer lithium ion battery is assembled by using b7 as a negative plate binder in a manner known in the industry and is recorded as C7.
Example 8
The method comprises the following steps: 1.9g of OP-10, 7.2g of sodium dodecyl sulfate and 2.13g of ammonium persulfate are sequentially added into a three-neck flask (a pre-emulsification kettle), then 300g of deionized water is added, and stirring is started to completely dissolve the materials; sequentially adding 100g of maleic anhydride, 115g of isooctyl acrylate, 215g of butyl acrylate, 151g of methyl methacrylate and 64g of styrene into a pre-emulsification kettle, and stirring and emulsifying for 15min to obtain a monomer pre-emulsion; (Pre-emulsion transfer to constant pressure sink funnel)
Step two: preparing a polyacrylate emulsion: sequentially adding 3.2g of sodium dodecyl sulfate, 3.5g of OP-10, 2g of sodium bicarbonate and 50g of deionized water into a polymerization kettle provided with a stirring and refluxing condenser tube, starting stirring to dissolve the sodium dodecyl sulfate, placing the sodium dodecyl sulfate and the deionized water into a water bath at 50 ℃, dissolving 1.07g of ammonium persulfate into 50g of water to obtain an ammonium persulfate aqueous solution, and filling the ammonium persulfate aqueous solution into a constant-pressure dropping funnel; weighing 50g of the monomer pre-emulsion prepared in the step one, adding into a polymerization kettle, dripping an ammonium persulfate aqueous solution, finishing adding within 15min, heating to 85 ℃ in a water bath, and preserving heat for 2 h; cooling to room temperature, and adjusting the pH value to 9 with ammonia water to obtain polyacrylate emulsion;
step three: modification of polycarbonate: 21.5g of polycarbonate emulsion is added into the polyacrylate emulsion, the mixture is stirred for 2 hours to be completely mixed, and then the mixture is discharged and reserved as b 8.
Assembling the battery: the polymer lithium ion battery is assembled by using b8 as a negative plate binder in a manner known in the industry and is recorded as C8.
Comparative example 1
Assembling the battery: the polymer lithium ion battery is assembled by using SBR as a negative plate binder in a manner known in the industry and is marked as C9.
The performance tests were performed for example 1, example 3, example 5 and comparative example 1, and the test items included 0 ℃ charge, -20 ℃ discharge, 60 ℃ storage for 30 days, and cycle retention.
Charging at 0 ℃: and standing the battery in an oven at 0 ℃, charging at 0.2 ℃ and discharging at 0.5 ℃ for 10 times, and dissecting and observing the surface state of the negative plate after the battery is fully charged.
-20 ℃ discharge: the fully charged battery was left to stand in an oven at-20 ℃ to discharge at 0.5C, and the discharge capacity was calculated.
Storage at 60 ℃ for 30 days: the fully charged battery was left standing in an oven at 60 ℃ for 30 days, and the battery thickness expansion rate was calculated.
Cycle retention ratio: the capacity retention rate was calculated at room temperature for 300 weeks with 1C charge-discharge cycles.
The results of the above tests are given in the following table:
as can be seen from the above test results, the batteries of examples 1, 3, and 5 exhibited balanced electrical properties, and capacity exertion at low temperatures was significantly superior to that of the battery of comparative example using a conventional binder, while high-temperature properties were comparable to those of comparative example. The polycarbonate modified binder system greatly improves the high-temperature storage performance of the battery under the condition of keeping excellent low-temperature dynamics of acrylate.
Claims (6)
1. An anode binder characterized in that: the negative electrode binder is polycarbonate modified acrylate, the polycarbonate modified acrylate comprises polycarbonate and polyacrylate, and the volume percentage of the polycarbonate is 5-15%.
2. The negative electrode binder as claimed in claim 1, wherein: the polycarbonate has a structural formula as shown in formula (I):
wherein: r is one or two of benzyl, phenethyl, phenylpropyl and p-methyl-ethyl.
3. The preparation method of the anode binder according to claim 1 or 2, which is characterized by comprising the following steps:
the method comprises the following steps: adding an emulsifier and an initiator into deionized water, stirring until the emulsifier and the initiator are completely dissolved, adding an acrylate monomer, a bonding monomer and a crosslinking monomer, and stirring and emulsifying to obtain a monomer pre-emulsion;
step two: adding an emulsifier, a buffering agent and deionized water into a reaction kettle, stirring until the emulsifier, the buffering agent and the deionized water are completely dissolved, and placing the mixture into a water bath at 50 ℃; dropwise adding an initiator aqueous solution and the monomer pre-emulsion into a reaction kettle, heating to 85 ℃ in a water bath, carrying out polymerization reaction for 2 hours, cooling to room temperature, and adjusting the pH value to 7-9 with ammonia water to obtain a polyacrylate emulsion;
step three: adding polycarbonate into the polyacrylate emulsion, and continuously stirring for 2h to completely mix the polycarbonate and the polyacrylate to obtain polycarbonate modified polyacrylate, wherein the volume percentage of the polycarbonate is 5-15%.
4. The method for preparing an anode binder according to claim 3, wherein: the acrylate monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA), isooctyl acrylate (2-EHA), vinyl acetate (VAc), styrene (St), Methyl Methacrylate (MMA), methyl acrylate, ethyl methacrylate, butyl methacrylate, isooctyl methacrylate, methyl vinyl acetate, methacrylamide and methyl styrene; the bonding monomer is one or more of Ethyl Acrylate (EA), Butyl Acrylate (BA) and isooctyl acrylate (2-EHA); the crosslinking monomer is one or more of methacrylic acid, acrylic acid, hydroxyethyl acrylate, acrylonitrile, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, glycidyl methacrylate, maleic anhydride, N-hydroxymethyl acrylamide and trimethylamine ethyl methacrylate; the emulsifier is one or more of anionic emulsifier, cationic emulsifier, amphoteric emulsifier and nonionic emulsifier; the initiator is one or more of lauroyl peroxide, diisopropyl peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, tert-butyl peroxypivalate, 3, 5-trimethylhexanoyl peroxide, azo compounds such as alpha, alpha' -azobisisobutyronitrile and the like, ammonium persulfate and potassium persulfate; the buffer is sodium bicarbonate.
5. The method for preparing an anode binder according to claim 3, wherein: the emulsifier is one or more of sodium dodecyl sulfate, OP-10 (polyoxyethylene octyl phenol ether-10), sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, dioctyl sodium sulfosuccinate, para-nonylphenol polyoxyethylene (n ═ 4-40) ether and polyoxyethylene monolaurate.
6. A lithium ion battery comprising the negative electrode binder of claim 1 or 2, wherein: the negative electrode of the lithium ion battery comprises the negative electrode binder.
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| CN113937288B (en) * | 2020-06-29 | 2023-04-18 | 珠海冠宇电池股份有限公司 | Positive pole piece and secondary battery containing same |
| CN113937287B (en) * | 2020-06-29 | 2023-04-18 | 珠海冠宇电池股份有限公司 | Negative pole piece and secondary battery containing same |
| CN116995238B (en) * | 2023-08-07 | 2024-04-16 | 宇锵新材料(湖北)有限公司 | Conductive coating for lithium ion battery and preparation method thereof |
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| JP2006339093A (en) * | 2005-06-06 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Wound type nonaqueous electrolyte secondary battery and its negative electrode |
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