CN116904073B - Preparation method of water-resistant carbon-coated slurry and carbon-coated current collector - Google Patents
Preparation method of water-resistant carbon-coated slurry and carbon-coated current collector Download PDFInfo
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- CN116904073B CN116904073B CN202310859728.9A CN202310859728A CN116904073B CN 116904073 B CN116904073 B CN 116904073B CN 202310859728 A CN202310859728 A CN 202310859728A CN 116904073 B CN116904073 B CN 116904073B
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- polyacrylic acid
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 65
- 239000002002 slurry Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 47
- 239000002121 nanofiber Substances 0.000 claims abstract description 36
- 239000002131 composite material Substances 0.000 claims abstract description 32
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 26
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 24
- 239000011737 fluorine Substances 0.000 claims abstract description 24
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 239000006258 conductive agent Substances 0.000 claims abstract description 9
- 229920002125 Sokalan® Polymers 0.000 claims description 72
- 239000004584 polyacrylic acid Substances 0.000 claims description 71
- 238000003756 stirring Methods 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 39
- RQVLGLPAZTUBKX-VKHMYHEASA-N L-vinylglycine Chemical compound C=C[C@H](N)C(O)=O RQVLGLPAZTUBKX-VKHMYHEASA-N 0.000 claims description 28
- WTDRDQBEARUVNC-LURJTMIESA-N L-DOPA Chemical compound OC(=O)[C@@H](N)CC1=CC=C(O)C(O)=C1 WTDRDQBEARUVNC-LURJTMIESA-N 0.000 claims description 25
- WTDRDQBEARUVNC-UHFFFAOYSA-N L-Dopa Natural products OC(=O)C(N)CC1=CC=C(O)C(O)=C1 WTDRDQBEARUVNC-UHFFFAOYSA-N 0.000 claims description 24
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 24
- 229960004502 levodopa Drugs 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 13
- 229960003638 dopamine Drugs 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- 239000012670 alkaline solution Substances 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 4
- 229920000767 polyaniline Polymers 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000010041 electrostatic spinning Methods 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920000128 polypyrrole Polymers 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000006230 acetylene black Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide Chemical compound CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 239000011888 foil Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 8
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 8
- YFSUTJLHUFNCNZ-UHFFFAOYSA-N perfluorooctane-1-sulfonic acid Chemical compound OS(=O)(=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)F YFSUTJLHUFNCNZ-UHFFFAOYSA-N 0.000 description 8
- 239000006255 coating slurry Substances 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 7
- 238000007756 gravure coating Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 244000028419 Styrax benzoin Species 0.000 description 4
- 235000000126 Styrax benzoin Nutrition 0.000 description 4
- 235000008411 Sumatra benzointree Nutrition 0.000 description 4
- 229960002130 benzoin Drugs 0.000 description 4
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 235000019382 gum benzoic Nutrition 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- NQTADLQHYWFPDB-UHFFFAOYSA-N N-Hydroxysuccinimide Chemical compound ON1C(=O)CCC1=O NQTADLQHYWFPDB-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- KIPSRYDSZQRPEA-UHFFFAOYSA-N 2,2,2-trifluoroethanamine Chemical group NCC(F)(F)F KIPSRYDSZQRPEA-UHFFFAOYSA-N 0.000 description 1
- AOJJSUZBOXZQNB-VTZDEGQISA-N 4'-epidoxorubicin Chemical group O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(=O)CO)[C@H]1C[C@H](N)[C@@H](O)[C@H](C)O1 AOJJSUZBOXZQNB-VTZDEGQISA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000011206 ternary composite Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
- C08F8/32—Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
- D06M2101/28—Acrylonitrile; Methacrylonitrile
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Electrochemistry (AREA)
- Dispersion Chemistry (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention relates to the technical field of carbon-coated current collectors, in particular to a water-resistant carbon-coated slurry and a preparation method of a carbon-coated current collector. The raw materials of the water-resistant carbon-coated slurry comprise the following components: 6-8 parts of conductive agent, 15-17 parts of composite binder and 75-79 parts of pure water according to parts by weight; the raw materials of the composite adhesive comprise conductive polymer nano-fibers, fluorine-containing organic sulfonic acid and an aqueous adhesive in a mass ratio of (0.15-0.3) to (2-3).
Description
Technical Field
The invention relates to the technical field of carbon-coated current collectors, in particular to a water-resistant carbon-coated slurry and a preparation method of a carbon-coated current collector.
Background
With the improvement of the requirements of social development on environmental protection, energy conservation and consumption reduction, the advantages of recycling, environmental protection and energy conservation and the like of the lithium battery are increasingly highlighted. The current collector is taken as one of important components of the lithium battery, and with the development of the lithium battery, the performance requirement is higher and higher.
At present, with the development of scientific technology and demands, composite carbon-coated current collectors based on aluminum foils and copper foils are strong in development, and the performance is obviously enhanced. The main preparation method of the composite carbon-coated current collector is as follows: the carbon-coated slurry containing a conductive agent, a binder, a dispersing agent and other formula systems is uniformly coated on current collectors such as aluminum foil, copper foil and the like by using a gravure or micro-gravure technology. In the prior art, carbon-coated slurry is divided into an aqueous system and an oily system; in an oily system, good water resistance can be realized; however, the system has large relative environmental pollution, the manufacturing process has large toxicity to people, and the workshop environment humidity control requirement is high, the equipment requirement is high, the cost requirement is high, and the mass production is not facilitated. In aqueous systems, polyacrylic acids are mostly used as binders in the mainstream applications; the polyacrylic acid binder is a water-based solvent system, has poor water affinity and water resistance, is easy to infiltrate with water to cause the coating to fall off, and influences the coating effect of the carbon-coated current collector.
In summary, the preparation of the water-resistant carbon-coated slurry and the carbon-coated current collector has important application value.
Disclosure of Invention
The invention aims to provide a water-resistant carbon-coated slurry, a carbon-coated current collector preparation method and a preparation process thereof, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
The raw materials of the water-resistant carbon-coated slurry comprise the following components: 6-8 parts of conductive agent, 15-17 parts of composite binder and 75-79 parts of pure water according to parts by weight; the raw materials of the composite adhesive comprise conductive polymer nano-fibers, fluorine-containing organic sulfonic acid and an aqueous adhesive in a mass ratio of (0.15-0.3) to (2-3).
More optimally, the preparation method of the composite binder comprises the following steps: adding the conductive polymer nanofiber into an alkaline solution with the concentration of 0.8-1.2 mol/L, and removing doping; adding 0.15-0.3 wt% fluorine-containing organic sulfonic acid solution, stirring; adding 20-30wt% of aqueous binder solution, mixing and stirring to obtain the composite binder.
More preferably, the raw materials of the aqueous binder comprise the following components: the weight portions are as follows: 12 to 17 parts of levodopa modified polyacrylic acid, 6 to 10 parts of L-vinylglycine modified polyacrylic acid, 2 to 3 parts of sulfhydryl polyethylene glycol dopamine and 0.03 to 0.05 part of photoinitiator.
More optimally, the preparation method of the levodopa modified polyacrylic acid comprises the following steps: adding polyacrylic acid into pure water, and adjusting the pH value to be 5.2-5.7; EDC and NHS are added and stirred uniformly; adding levodopa and 2, 2-trifluoroethylamine, stirring at room temperature for 12-24 hours, dialyzing, and freeze-drying to obtain the levodopa modified polyacrylic acid.
More optimally, the raw materials of the levodopa-modified polyacrylic acid comprise the following components: 4 to 6 parts of polyacrylic acid, 1.2 to 1.3 parts of levodopa and 0.2 to 0.3 part of 2, 2-trifluoroethylamine.
More optimally, the preparation method of the L-vinylglycine modified polyacrylic acid comprises the following steps: adding polyacrylic acid into pure water, adjusting the pH to be 5.2-5.7, adding EDC and NHS, and uniformly stirring; adding L-vinylglycine, stirring at room temperature for 12-24 hours, dialyzing, and freeze-drying to obtain the L-vinylglycine modified polyacrylic acid.
More optimally, the raw materials of the L-vinylglycine-modified polyacrylic acid comprise the following components: 4-6 parts of polyacrylic acid and 1.2-1.5 parts of L-vinylglycine by weight.
More optimally, the preparation method of the conductive polymer nanofiber comprises the following steps: (1) Dissolving a polymer in a solvent to obtain a polymer solution with the weight percent of 8-10 percent, and carrying out electrostatic spinning to obtain polymer nanofibers with the average diameter of 100-200 nm; (2) Dispersing conductive high molecular monomer into acid solution of 0.8-1.2 mol/L, and dispersing uniformly; adding polymer nanofiber, dropwise adding 1-1.2 wt% of oxidant solution, and stirring for reaction to obtain conductive polymer nanofiber;
Wherein the polymer comprises one or more of polyacrylonitrile, polyvinylpyrrolidone, polycarbonate, polyethylene oxide, polymethyl methacrylate, polylactic acid and polyacrylamide; the conductive high molecular monomer comprises one or two of polyaniline and polypyrrole.
More preferably, the conductive agent comprises one or more of graphite, acetylene black, carbon nanotubes and graphene. Including but not limited to.
More optimally, the water-resistant carbon-coated slurry is coated on the surface of a current collector, and the current collector is prepared by ultraviolet irradiation and baking.
Compared with the prior art, the invention has the following beneficial effects:
In the technical scheme, in order to enhance the conductivity, the cohesiveness and the water resistance of the carbon-coated current collector, the conductive polymer nanofiber and the water-based binder of the modified polyacrylic acid are compounded to form a composite binder in the scheme, so that the carbon-coated slurry effectively ensures the cohesiveness peeling strength of the carbon-coated slurry and the current collector on the basis of enhancing the conductivity and the water resistance of the current collector; in addition, the carbon-coated slurries formed in the schemes are distinguished from the toxic and hazardous, environmentally undesirable properties of oily slurry systems.
The composite binder is formed by doping conductive polymer nanofibers with fluorine-containing organic sulfonic acid and then compositing the conductive polymer nanofibers with a modified polyacrylic acid aqueous binder. The conductive polymer nanofiber is prepared by referring to the prior art, and is a coaxial nanofiber with a core-shell structure, and the surface of the nanofiber is conductive due to the fact that the nanofiber contains nano conductive monomers (polyaniline or polypyrrole). The conductive agent is effectively enhanced by introducing the conductive agent into the composite binder, and the penetration resistance of the carbon-coated current collector is reduced. On the other hand, the conductive polymer nanofiber uses fluorine-containing organic sulfonic acid to carry out pre-modification by utilizing the electrostatic effect (sulfonic acid group and amino group), so that the conductive polymer nanofiber has certain hydrophobicity in an acidic or neutral system, and the water resistance of the composite binder in a lithium battery containing acidic electrolyte can be effectively improved.
Wherein, the conductive polymer nanofiber is modified by fluorine-containing organic sulfonic acid in advance, so that the cohesiveness of the composite binder is reduced. In this case, an aqueous binder comprising a modified polyacrylic acid comprising levodopa-modified polyacrylic acid, L-vinylglycine-modified polyacrylic acid, mercaptopolyethylene glycol dopamine; effectively ensures the cohesiveness and improves the peeling strength of the slurry.
(1) The levodopa modified polyacrylic acid is prepared by grafting levodopa containing catechol groups and 2, 2-trifluoroethylamine containing fluorine groups on chain segments thereof by utilizing a carboxyl and amino coupling reaction; the affinity between the grafted fluorine-based chain scission and fluorine-containing benzenesulfonic acid is utilized to improve the affinity with the pre-modified conductive polymer nanofiber and improve the water resistance; by utilizing the strong adhesiveness of catechol groups, the interaction between the catechol groups and the surface of a current collector is improved, and the adhesiveness reduction caused by the introduction of fluorine-containing chain segments is effectively inhibited. Meanwhile, carboxyl in polyacrylic acid can also generate electrostatic action with conductive polymer nanofibers to generate physical crosslinking, so that the stability of the carbon coating is improved.
(2) In order to improve the cohesiveness of the carbon coating, in the scheme, L-vinylglycine modified polyacrylic acid and sulfhydryl polyethylene glycol dopamine are also mixed; the vinyl in the L-vinylglycine modified polyacrylic acid and the mercapto in the mercapto polyethylene glycol dopamine are utilized to generate crosslinking, so that the crosslinking density of the carbon-coated layer is improved, and the water resistance is improved. And the catechol group contained in mercapto polyethylene glycol dopamine can further improve the adhesiveness.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the manufacturers of all the raw materials according to the present invention include, without any particular limitation: in the following examples, the conductive agent is conductive graphite KS-6, provided by Keramal; the fluorine-containing organic sulfonic acid is perfluorooctanesulfonic acid, and the CAS number is 1763-23-1; EDC is 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide, CAS number 1892-57-5; and NHS is N-hydroxysuccinimide with CAS number 6066-82-6; the CAS number of the levodopa is 59-92-7, which is provided by Hubei Jusheng technology; the CAS number of the 2, 2-trifluoroethylamine is 753-90-2, which is provided by Hebei province chemical industry; l-vinylglycine has a CAS number of 70982-53-5, supplied by Shanghai Jin Jinle; the average molecular weight of the polyacrylic acid was 450000, supplied by Sigma; the average molecular weight of the sulfhydryl polyethylene glycol dopamine is 1000, and the product number is 80030817-1000, which is provided by Guangzhou carbohydrate technology.
Preparing conductive polymer nano fibers: (1) Polyacrylonitrile is dissolved in N, N-dimethylformamide to obtain 8wt% polymer solution; carrying out electrostatic spinning on the fiber, wherein the spinning parameters are as follows: the voltage is 15kV, the receiving distance is 10cm, the injection speed is 36 mu L/min, the temperature is 18 ℃, and the humidity is 26%; obtaining polymer nanofibers; (2) 5mL of polyaniline is dispersed in 250mL of 1mol/L hydrochloric acid solution, 15g of polymer nanofiber is added, 250mL of 1wt% oxidant solution (ammonium persulfate as solute and 1mol/L hydrochloric acid solution as solvent) is added dropwise, and the mixture is stirred and reacted for 1 hour to obtain the conductive polymer nanofiber. The following parts are parts by mass.
Example 1: preparation of carbon-coated current collector:
Step 1: (1) 15 parts of polyacrylic acid was added to 75 parts of pure water, and ph=5.6 was adjusted; 3.5 parts of EDC and 2.2 parts of NHS are added and stirred uniformly; 3.75 parts of levodopa and 0.75 part of 2, 2-trifluoroethylamine are added, stirred at room temperature for 24 hours, dialyzed and freeze-dried, and the levodopa-modified polyacrylic acid is obtained.
(2) 10 Parts of polyacrylic acid is added into 70 parts of pure water, the pH value is adjusted to be 5.5, 2 parts of EDC and 1.2 parts of NHS are added, and the mixture is stirred uniformly; 2.5 parts of L-vinylglycine is added, stirred for 24 hours at room temperature, dialyzed and freeze-dried to obtain the L-vinylglycine modified polyacrylic acid.
(3) Uniformly mixing 15 parts of levodopa modified polyacrylic acid, 8 parts of L-vinylglycine modified polyacrylic acid, 2 parts of sulfhydryl polyethylene glycol dopamine and 0.05 part of photoinitiator benzoin dimethyl ether, sequentially adding the mixture into 75 parts of pure water, and uniformly stirring to obtain an aqueous binder solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(4) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 7 parts of conductive graphite, 16 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; irradiation was performed for 3 minutes with 365nm ultraviolet light, and dried in an oven at 100 ℃ for 30 minutes to obtain a carbon-coated current collector.
Example 2: preparation of carbon-coated current collector:
Step 1: (1) 15 parts of polyacrylic acid was added to 75 parts of pure water, and ph=5.6 was adjusted; 3.5 parts of EDC and 2.2 parts of NHS are added and stirred uniformly; 3.75 parts of levodopa and 0.75 part of 2, 2-trifluoroethylamine are added, stirred at room temperature for 24 hours, dialyzed and freeze-dried, and the levodopa-modified polyacrylic acid is obtained.
(2) 10 Parts of polyacrylic acid is added into 70 parts of pure water, the pH value is adjusted to be 5.5, 2 parts of EDC and 1.2 parts of NHS are added, and the mixture is stirred uniformly; 2.5 parts of L-vinylglycine is added, stirred for 24 hours at room temperature, dialyzed and freeze-dried to obtain the L-vinylglycine modified polyacrylic acid.
(3) Uniformly mixing 12 parts of levodopa modified polyacrylic acid, 6 parts of L-vinylglycine modified polyacrylic acid, 2 parts of sulfhydryl polyethylene glycol dopamine and 0.05 part of photoinitiator benzoin dimethyl ether, sequentially adding into 80 parts of pure water, and uniformly stirring to obtain an aqueous binder solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(4) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 6 parts of conductive graphite, 17 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; irradiation was performed for 3 minutes with 365nm ultraviolet light, and dried in an oven at 100 ℃ for 30 minutes to obtain a carbon-coated current collector.
Example 3: preparation of carbon-coated current collector:
Step 1: (1) 15 parts of polyacrylic acid was added to 75 parts of pure water, and ph=5.6 was adjusted; 3.5 parts of EDC and 2.2 parts of NHS are added and stirred uniformly; 3.75 parts of levodopa and 0.75 part of 2, 2-trifluoroethylamine are added, stirred at room temperature for 24 hours, dialyzed and freeze-dried, and the levodopa-modified polyacrylic acid is obtained.
(2) 10 Parts of polyacrylic acid is added into 70 parts of pure water, the pH value is adjusted to be 5.5, 2 parts of EDC and 1.2 parts of NHS are added, and the mixture is stirred uniformly; 2.5 parts of L-vinylglycine is added, stirred for 24 hours at room temperature, dialyzed and freeze-dried to obtain the L-vinylglycine modified polyacrylic acid.
(3) Uniformly mixing 17 parts of levodopa modified polyacrylic acid, 10 parts of L-vinylglycine modified polyacrylic acid, 3 parts of sulfhydryl polyethylene glycol dopamine and 0.05 part of photoinitiator benzoin dimethyl ether, sequentially adding into 70 parts of pure water, and uniformly stirring to obtain an aqueous binder solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(4) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 8 parts of conductive graphite, 15 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; irradiation was performed for 3 minutes with 365nm ultraviolet light, and dried in an oven at 100 ℃ for 30 minutes to obtain a carbon-coated current collector.
Comparative example 1: polyacrylic acid is used for replacing the composite binder; the remainder was the same as in example 1;
step 1: and adding 25 parts of polyacrylic acid into 225 parts of pure water, and uniformly stirring to obtain the composite adhesive.
Step 2: according to the parts by weight, 7 parts of conductive graphite, 16 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
Step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; drying in an oven at 100deg.C for 30 minutes to give a carbon coated current collector.
Comparative example 2: polyacrylic acid is used to replace the aqueous binder; the remainder was the same as in example 1;
Step 1: (1) Adding 25 parts of polyacrylic acid into 75 parts of pure water, and uniformly stirring to obtain an aqueous bonding solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(2) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 7 parts of conductive graphite, 16 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
Step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; drying in an oven at 100deg.C for 30 minutes to give a carbon coated current collector.
Comparative example 3: the remainder of the single-introduced levodopa-modified polyacrylic acid was the same as in example 1;
Step 1: (1) 25 parts of polyacrylic acid was added to 75 parts of pure water, and ph=5.6 was adjusted; 3.5 parts of EDC and 2.2 parts of NHS are added and stirred uniformly; 3.75 parts of levodopa and 0.75 part of 2, 2-trifluoroethylamine are added, stirred at room temperature for 24 hours, dialyzed and freeze-dried, and the levodopa-modified polyacrylic acid is obtained.
(2) Adding 25 parts of levodopa modified polyacrylic acid into 75 parts of pure water, and uniformly stirring to obtain an aqueous binder solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(3) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 7 parts of conductive graphite, 16 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
Step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; drying in an oven at 100deg.C for 30 minutes to give a carbon coated current collector.
Comparative example 4: the remainder of the procedure of example 1 was repeated except that the levodopa-modified polyacrylic acid was replaced with polyacrylic acid.
Step 1: (1) 15 parts of polyacrylic acid was added to 75 parts of pure water, and ph=5.6 was adjusted; 3.5 parts of EDC and 2.2 parts of NHS are added and stirred uniformly; 3.75 parts of levodopa and 0.75 part of 2, 2-trifluoroethylamine are added, stirred at room temperature for 24 hours, dialyzed and freeze-dried, and the levodopa-modified polyacrylic acid is obtained.
(2) 10 Parts of polyacrylic acid is added into 70 parts of pure water, the pH value is adjusted to be 5.5, 2 parts of EDC and 1.2 parts of NHS are added, and the mixture is stirred uniformly; 2.5 parts of L-vinylglycine is added, stirred for 24 hours at room temperature, dialyzed and freeze-dried to obtain the L-vinylglycine modified polyacrylic acid.
(3) Uniformly mixing 20 parts of L-vinylglycine modified polyacrylic acid, 5 parts of sulfhydryl polyethylene glycol dopamine and 0.1 part of photoinitiator benzoin dimethyl ether, sequentially adding the mixture into 75 parts of pure water, and uniformly stirring to obtain an aqueous binder solution; adding 0.2 part of perfluorooctanesulfonic acid into 99.8 parts of pure water, and uniformly stirring to obtain a fluorine-containing organic sulfonic acid solution;
(4) Adding 1 part of conductive polymer nanofiber into 10 parts of 1mol/L alkaline solution, and carrying out dedoping; adding 100 parts of fluorine-containing organic sulfonic acid solution, and stirring; 10 parts of aqueous binder solution, and mixing and stirring to obtain the composite binder.
Step 2: according to the parts by weight, 7 parts of conductive graphite, 16 parts of composite binder and 77 parts of pure water are subjected to high-speed dispersion stirring to prepare water-resistant carbon-coated slurry;
Step 3: coating the electric resistance water-based carbon coating slurry on the surface of a 13 mu m aluminum foil by adopting a gravure coating method, wherein the coating thickness is 0.5 mu m; the carbon-coated current collector was obtained by irradiation with 365nm ultraviolet light for 8 minutes and drying in an oven at 100℃for 30 minutes.
Performance test: the carbon-coated current collectors prepared in examples and comparative examples were subjected to performance verification. (1) Referring to GB/T2792-2014, a 180 DEG peeling test is adopted to attach a sample to a 3M adhesive tape, a universal tester is used for peeling at a speed of 5mm/s, and the peeling strength is calculated. (2) At normal temperature, a pole piece resistance meter is used for detecting the penetration resistance under the conditions that the pressure is 19.2Mpa and the boosting speed is 0.29 Mpa/s. (3) The coating was wiped back and forth with a force of 10N by immersing a cotton swab in pure water sufficiently, the total length of wiping was 6cm, the back and forth was 1 time, the position of the exposed aluminum foil was known, and the number of wiping times was recorded. The data obtained are shown below:
| Sample of | Peel strength (N/m) | Penetration resistance (mΩ) | Water resistance (secondary) |
| Example 1 | 337 | 3.913 | 253 |
| Example 2 | 321 | 4.211 | 235 |
| Example 3 | 326 | 4.427 | 242 |
| Comparative example 1 | 282 | 4.865 | 106 |
| Comparative example 2 | 266 | 4.207 | 174 |
| Comparative example 3 | 302 | 4.109 | 197 |
| Comparative example 4 | 313 | 4.094 | 208 |
Conclusion: from the data in the above table, it can be seen that: in the scheme, the conductive nanofiber is introduced into the water-based adhesive, so that the adhesive property is ensured on the basis of enhancing the conductivity and the water resistance. Meanwhile, polyacrylic acid is modified to obtain levodopa modified polyacrylic acid and L-vinylglycine modified polyacrylic acid, and mercapto polyethylene glycol dopamine is used in parallel to form a ternary composite water-based adhesive, so that the viscosity performance is effectively enhanced.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A water-resistant carbon-coated slurry, characterized in that: the raw materials of the water-resistant carbon-coated slurry comprise the following components: 6-8 parts of conductive agent, 15-17 parts of composite binder and 75-79 parts of pure water according to parts by weight; the raw materials of the composite adhesive comprise (1) (0.15-0.3) conductive polymer nanofiber, fluorine-containing organic sulfonic acid and water-based adhesive in a mass ratio of (2-3);
The raw materials of the aqueous binder comprise the following components: the weight portions are as follows: 12-17 parts of levodopa modified polyacrylic acid, 6-10 parts of L-vinylglycine modified polyacrylic acid, 2-3 parts of sulfhydryl polyethylene glycol dopamine and 0.03-0.05 part of photoinitiator;
the raw materials of the levodopa modified polyacrylic acid comprise the following components: 4 to 6 parts of polyacrylic acid, 1.2 to 1.3 parts of levodopa and 0.2 to 0.3 part of 2, 2-trifluoroethylamine according to parts by weight;
The raw materials of the L-vinylglycine modified polyacrylic acid comprise the following components: 4-6 parts of polyacrylic acid and 1.2-1.5 parts of L-vinylglycine by weight.
2. A water-resistant carbon-coated slurry according to claim 1, wherein: the preparation method of the composite adhesive comprises the following steps: adding the conductive polymer nanofiber into an alkaline solution with the concentration of 0.8-1.2 mol/L, and removing doping; adding 0.15-0.3 wt% fluorine-containing organic sulfonic acid solution, stirring; adding 20-30wt% of aqueous binder solution, mixing and stirring to obtain the composite binder.
3. A water-resistant carbon-coated slurry according to claim 1, wherein: the preparation method of the levodopa modified polyacrylic acid comprises the following steps: adding polyacrylic acid into pure water, and adjusting the pH value to be 5.2-5.7; EDC and NHS are added and stirred uniformly; adding levodopa and 2, 2-trifluoroethylamine, stirring at room temperature for 12-24 hours, dialyzing, and freeze-drying to obtain the levodopa modified polyacrylic acid.
4. A water-resistant carbon-coated slurry according to claim 1, wherein: the preparation method of the L-vinylglycine modified polyacrylic acid comprises the following steps: adding polyacrylic acid into pure water, adjusting the pH to be 5.2-5.7, adding EDC and NHS, and uniformly stirring; adding L-vinylglycine, stirring at room temperature for 12-24 hours, dialyzing, and freeze-drying to obtain the L-vinylglycine modified polyacrylic acid.
5. A water-resistant carbon-coated slurry according to claim 1, wherein: the preparation method of the conductive polymer nanofiber comprises the following steps: (1) Dissolving a polymer in a solvent to obtain a polymer solution with the weight percent of 8-10 percent, and carrying out electrostatic spinning to obtain polymer nanofibers with the average diameter of 100-200 nm; (2) Adding conductive high molecular monomer into 0.8-1.2 mol/L acid solution, and uniformly dispersing; adding polymer nanofiber, dropwise adding 1-1.2 wt% of oxidant solution, and stirring for reaction to obtain conductive polymer nanofiber;
Wherein the polymer comprises one or more of polyacrylonitrile, polyvinylpyrrolidone, polycarbonate, polyethylene oxide, polymethyl methacrylate, polylactic acid and polyacrylamide; the conductive high molecular monomer comprises one or two of polyaniline and polypyrrole.
6. A water-resistant carbon-coated slurry according to claim 1, wherein: the conductive agent comprises one or more of graphite, acetylene black, carbon nanotubes and graphene.
7. A method for preparing a carbon-coated current collector, which is characterized by comprising the following steps: coating the water-resistant carbon-coated slurry according to any one of claims 1 to 6 on the surface of a current collector, and carrying out ultraviolet irradiation and baking to prepare the carbon-coated current collector.
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| CN110718674A (en) * | 2019-10-15 | 2020-01-21 | 宁波铵特姆新能源科技有限公司 | Current collector conductive coating and preparation method thereof |
| CN116344830A (en) * | 2023-03-24 | 2023-06-27 | 江阴纳力新材料科技有限公司 | High-conductivity low-water-absorption nano carbon-coated current collector and preparation method thereof |
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| CN110718674A (en) * | 2019-10-15 | 2020-01-21 | 宁波铵特姆新能源科技有限公司 | Current collector conductive coating and preparation method thereof |
| CN116344830A (en) * | 2023-03-24 | 2023-06-27 | 江阴纳力新材料科技有限公司 | High-conductivity low-water-absorption nano carbon-coated current collector and preparation method thereof |
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