CN114784291A - Flexible current collector with composite structure and preparation method thereof - Google Patents
Flexible current collector with composite structure and preparation method thereof Download PDFInfo
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- CN114784291A CN114784291A CN202210603797.9A CN202210603797A CN114784291A CN 114784291 A CN114784291 A CN 114784291A CN 202210603797 A CN202210603797 A CN 202210603797A CN 114784291 A CN114784291 A CN 114784291A
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- conductive
- current collector
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- composite structure
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- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910052751 metal Inorganic materials 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 62
- 238000000576 coating method Methods 0.000 claims abstract description 52
- 239000011248 coating agent Substances 0.000 claims abstract description 51
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 25
- 239000006255 coating slurry Substances 0.000 claims description 21
- 238000007731 hot pressing Methods 0.000 claims description 13
- 238000007751 thermal spraying Methods 0.000 claims description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical class OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000004698 Polyethylene Substances 0.000 claims description 11
- 239000004642 Polyimide Substances 0.000 claims description 11
- 229920001721 polyimide Polymers 0.000 claims description 11
- 229920002635 polyurethane Polymers 0.000 claims description 11
- 239000004814 polyurethane Substances 0.000 claims description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims description 11
- 238000013329 compounding Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 9
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 9
- 239000004800 polyvinyl chloride Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- 238000004132 cross linking Methods 0.000 claims description 8
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 8
- 229920000578 graft copolymer Polymers 0.000 claims description 8
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 7
- 229920002125 Sokalan® Polymers 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 229920001940 conductive polymer Polymers 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- OMNKZBIFPJNNIO-UHFFFAOYSA-N n-(2-methyl-4-oxopentan-2-yl)prop-2-enamide Chemical compound CC(=O)CC(C)(C)NC(=O)C=C OMNKZBIFPJNNIO-UHFFFAOYSA-N 0.000 claims description 7
- 239000004584 polyacrylic acid Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 229920002530 polyetherether ketone Polymers 0.000 claims description 7
- 238000007788 roughening Methods 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000004952 Polyamide Substances 0.000 claims description 6
- 239000006230 acetylene black Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- LLEMOWNGBBNAJR-UHFFFAOYSA-N biphenyl-2-ol Chemical compound OC1=CC=CC=C1C1=CC=CC=C1 LLEMOWNGBBNAJR-UHFFFAOYSA-N 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 229920000767 polyaniline Polymers 0.000 claims description 6
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 229920000128 polypyrrole Polymers 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229920002873 Polyethylenimine Polymers 0.000 claims description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- 238000007646 gravure printing Methods 0.000 claims description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 4
- 239000004645 polyester resin Substances 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 229920000123 polythiophene Polymers 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 229920001567 vinyl ester resin Polymers 0.000 claims description 4
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 3
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 229920000491 Polyphenylsulfone Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000004643 cyanate ester Substances 0.000 claims description 3
- 229910003472 fullerene Inorganic materials 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 235000010292 orthophenyl phenol Nutrition 0.000 claims description 3
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 3
- 229920002492 poly(sulfone) Polymers 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 3
- 229920005596 polymer binder Polymers 0.000 claims description 3
- 239000002491 polymer binding agent Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000004971 Cross linker Substances 0.000 claims description 2
- 229920001400 block copolymer Polymers 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 abstract description 3
- 238000010923 batch production Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 52
- 239000007772 electrode material Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000003851 corona treatment Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229920006254 polymer film Polymers 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007750 plasma spraying Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000011530 conductive current collector Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011536 re-plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000004804 winding 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
- 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
-
- 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
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
Abstract
The invention provides a flexible current collector with a composite structure and a preparation method thereof, and belongs to the technical field of new energy battery materials. The flexible current collector of the present invention comprises a flexible non-conductive substrate, a conductive metal layer, and a conductive carbon coating. According to the invention, a layer of conductive metal material is sprayed or thermally compounded by a dry method on the surface of the flexible non-conductive base material, and then the conductive carbon coating with low cost, high efficiency and excellent performance is coated on the surface of the metal film, so that the prepared flexible current collector has the advantages of lower cost, better adhesive force and more excellent electrochemical performance, and meanwhile, the safety performance of the battery can be better solved, and the flexible current collector is suitable for large-scale batch production.
Description
Technical Field
The invention relates to the technical field of new energy battery materials, in particular to a flexible current collector with a composite structure and a preparation method thereof.
Background
Current collectors currently used in electrochemical systems, including lithium ion batteries, solid state batteries, supercapacitors and lithium sulfur batteries, are mainly aluminum foils and copper foils. The current collector mainly functions to provide good electronic conduction capability and connect to an external circuit, and the prior art includes using aluminum foil, copper foil or other base film with electronic conduction capability as the current collector directly in an electrochemical system, and also includes a coating modified current collector used for improving the good contact capability of the current collector with an electrode material attached to the surface of the current collector, improving the electronic conduction capability of an interface, and avoiding corrosion of the current collector by some substances in the electrochemical system.
The current collector is a metal current collector or a metal substrate for surface modification, and the whole current collector is an electronic conductive path, so that the safety problem of the high-energy density lithium battery in thermal runaway can not be solved. Meanwhile, the current collector product gradually develops towards light weight, high interface binding force and high safety under the requirements of high energy density, high safety, rapid charge and discharge capacity and long cycle life of an application end.
The patent with the application number of 201811401509.1 (application date: 2018-11-22) discloses a lithium ion battery current collector and a preparation method thereof, wherein the current collector adopts a flexible non-conductive base material, and a metal conductive coating is formed on the surface of the base material by chemical plating or electroplating. The current collector can improve the strength performance of the current collector and the safety performance of a lithium ion battery.
The patent with the application number of 201710243721.9 (application date: 2017-04-14) discloses a positive current collector, a preparation method and application thereof, wherein the current collector adopts a multi-layer structure comprising a plastic film, and an adhesive force enhancement layer, an aluminum metal coating, an anti-oxidation layer and the like are sequentially plated on the upper surface and the lower surface of the plastic film. The positive current collector can realize light weight of the battery and improve energy density, and can ensure that the aluminum plating layer is not easy to fall off and oxidize.
The patent with application number 201810691419.4 discloses a flexible current collector, a preparation method thereof and application thereof in a lithium ion battery, wherein the current collector adopts a polymer film as a substrate, after surface treatment, a metal conductive carbon coating is sputtered on two surfaces of the polymer film by a target material by a vacuum sputtering method, and then active material coatings are coated on two sides of the metal conductive carbon coating. The advantages are that the flexibility and the mechanical strength are better, and the crease or brittle fracture is not easy to generate in the bending process; the polymer film has lower mass density as the material of the substrate, can reduce the total quality of the battery and improve the energy density of the battery, and simultaneously has the advantages of high temperature resistance, oxidation resistance, low material cost and convenient mass production.
The surface conductive layer of the flexible non-conductive substrate adopted in the above-mentioned published patent forms a metal conductive layer on the surface of the flexible non-conductive current collector, and such metal conductive layer can cause the following problems in the application process:
1) when the metal conducting layer is applied, the contact area between the electrode material layer and the rigid metal material is smaller due to the contact between the electrode material and the rigid metal material, the electrode material layer swells when the pole piece is soaked in the later period, the contact area between the electrode material layer and the metal conducting layer is smaller, the interface impedance is larger, the integral electronic conduction capability of the electrode pole piece is poorer, and the performance and the cycle service life of the electrochemical system under the high-current charging and discharging condition are influenced;
2) because the contact area between the metal conducting layer and the electrode material layer is small, the adhesive force deviation between the adhesive in the electrode material layer and the rigid metal conducting layer can be caused, the impedance consistency of the electrode slice is poor, the current density distribution is not uniform, and the electrochemical performance and consistency of an electrochemical system product are seriously influenced;
3) the electrode material layer has a certain degree of dimensional change during the working period of the battery, so that the interface connection between the originally weak metal conducting layer and the electrode material layer is strengthened, and the performance of an electrochemical system is rapidly deteriorated;
4) plating an oxide layer on the surface of the metal coating, wherein if the oxide layer is a metal layer, the oxidation problem still exists; if it is non-metallic SiC, Si3N4Or Al2O3Then Si3N4And Al2O3Being a non-conductive material, SiC being a semiconductor material, the electron conducting capacity is greatly hindered, and such a re-plating method also results in excessive costs.
Therefore, it is an urgent problem to obtain a flexible current collector with low cost, strong adhesion and excellent electrochemical performance.
Disclosure of Invention
The invention aims to provide a flexible current collector with a composite structure and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a flexible current collector with a composite structure, which comprises a flexible non-conductive substrate, a conductive metal layer and a conductive carbon coating;
the flexible non-conductive base material comprises one of polyethylene terephthalate, polyphenylene sulfide, polyether ether ketone, polypropylene, polyethylene, polyimide, o-phenylphenol, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polyacrylonitrile, polyacrylic acid, polyvinyl alcohol, polyethyleneimine, polyamide, polyphenylsulfone, polysulfone, ethylene-vinyl acetate copolymer and polystyrene; the thickness of the flexible non-conductive base material is 5-40 mu m;
the conductive carbon coating is prepared from the following raw materials in parts by mass: 0.1-40 parts of a high-molecular binder, 0.01-40 parts of a conductive polymer, 20-80 parts of a conductive powder, 0.01-10 parts of a crosslinking component, 10-80 parts of a solvent and 0.1-10 parts of a flatting agent; the thickness of the conductive carbon coating is 10-5000 nm.
Furthermore, the metal of the conductive metal layer comprises one or more of Al, Cu, Fe, Ni, Na, Li, Au, Ag and stainless steel, and the thickness of the metal layer is 1-10 μm.
Further, the polymer binder comprises one or more of sodium carboxymethylcellulose, lithium carboxymethylcellulose, polyacrylic acid, polyamide, polyacrylamide, polyethylene glycol, polyacrylonitrile, polypropylene, polyethylene, polyvinyl chloride, polybutylene terephthalate, polyvinylidene fluoride, polyimide, epoxy resin, polyurethane, polyether ether ketone, polymethyl methacrylate, polyurethane, modified acrylic acid, modified polyurethane, modified styrene-butadiene rubber, and derivatives or blocks and graft copolymers of the above polymers.
Further, the conductive polymer comprises one or more of polythiophene, polypyrrole, polyaniline and derivatives or block and graft copolymers of the polymers;
the conductive powder comprises one or more of carbon black, acetylene black, carbon nanotubes, carbon fibers, graphite, nano graphite, graphene, fullerene and conductive oxide.
Further, the crosslinking component comprises diacetone acrylamide and/or polyacrylic acid-diacetone acrylamide resin-adipic dihydrazide co-crosslinking matter;
the solvent comprises one or more of N-methyl pyrrolidone, water, isopropanol and absolute ethyl alcohol;
the flatting agent comprises one or more of isophorone, diacetone alcohol, ethylene glycol butyl ether, acrylic acid, organic silicon and fluorocarbon.
The invention provides a preparation method of a flexible current collector with a composite structure, which comprises the following steps:
1) attaching conductive metal to the surface of a flexible non-conductive substrate to obtain a metal film layer current collector;
2) preparing conductive carbon coating slurry, coating the surface of the metal film layer current collector, and drying to obtain the composite structure flexible current collector;
in the step 1), the attachment comprises spraying or dry thermal compounding;
the spraying is to sequentially perform thermal spraying and hot pressing treatment on the surface of the flexible non-conductive substrate to obtain a metal film current collector;
the dry thermal compounding is to carry out roughening pretreatment on the surface of the flexible non-conductive base material, then adopt a gravure printing or an overstock coating mode to coat thermosetting glue solution on the surface of the pretreated flexible non-conductive base material, and then compound the metal film with the coated flexible non-conductive base material in a heating mode to obtain the metal film layer current collector.
Further, the temperature of the thermal spraying is 100-1000 ℃, and the speed of the thermal spraying is 10-80 s/m; the pressure of the hot pressing treatment is 0.4-0.8 MPa, and the temperature of the hot pressing treatment is 50-120 ℃.
Further, the thermosetting glue solution comprises one or more of acrylic acid, epoxy resin, polyester resin, vinyl ester, bismaleimide, thermosetting polyimide, cyanate ester and polybutadiene resin; the heating temperature is 50-120 ℃.
Further, in the step 2), the coating speed is 1-180 m/min, and the drying temperature is 50-200 ℃.
Further, in the step 2), the viscosity of the conductive carbon coating slurry is 10-2000 mPa · s, the solid content of the conductive carbon coating slurry is 2-35%, and the pH value is 3-12.
The invention has the beneficial effects that: the problems of adhesion among the non-metal layer, the metal layer and the electrode layer and reduction of interface impedance can be effectively solved, and meanwhile, large-scale low-cost continuous industrial production can be more easily realized.
Detailed Description
The invention provides a flexible current collector with a composite structure, which comprises a flexible non-conductive base material, a conductive metal layer and a conductive carbon coating;
the flexible non-conductive base material comprises one of polyethylene terephthalate, polyphenylene sulfide, polyether ether ketone, polypropylene, polyethylene, polyimide, o-phenylphenol, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polyacrylonitrile, polyacrylic acid, polyvinyl alcohol, polyethyleneimine, polyamide, polyphenylsulfone, polysulfone, ethylene-vinyl acetate copolymer and polystyrene; the thickness of the flexible non-conductive base material is 5-40 mu m;
the conductive carbon coating is prepared from the following raw materials in parts by mass: 0.1-40 parts of a high-molecular binder, 0.01-40 parts of a conductive polymer, 20-80 parts of conductive powder, 0.01-10 parts of a crosslinking component, 10-80 parts of a solvent and 0.1-10 parts of a flatting agent; the thickness of the conductive carbon coating is 10-5000 nm.
In the present invention, the flexible non-conductive substrate is preferably one of polyethylene terephthalate, polyphenylene sulfide, polyetheretherketone, polypropylene, polyethylene, polyimide, polyvinyl chloride, polyacrylonitrile, polyacrylic acid, polyvinyl alcohol, polyethylene imine, ethylene-vinyl acetate copolymer, and polystyrene.
In the invention, the thickness of the flexible non-conductive base material is preferably 10-30 μm, and more preferably 15-20 μm.
In the present invention, the amount of the polymer binder added to the conductive carbon coating is 0.1 to 40 parts, preferably 0.5 to 30 parts, more preferably 1.0 to 20 parts, and still more preferably 5 to 10 parts. The high molecular binder comprises one or more of sodium carboxymethylcellulose, lithium carboxymethylcellulose, polyacrylic acid, polyamide, polyacrylamide, polyethylene glycol, polyacrylonitrile, polypropylene, polyethylene, polyvinyl chloride, polybutylene terephthalate, polyvinylidene fluoride, polyimide, epoxy resin, polyurethane, polyether ether ketone, polymethyl methacrylate, polyurethane, modified acrylic acid, modified polyurethane, modified styrene-butadiene rubber and derivatives or blocks and graft copolymers of the above polymers, preferably one or more of sodium carboxymethylcellulose, lithium carboxymethylcellulose, polyacrylonitrile, polypropylene, polyethylene, polyvinyl chloride, modified polyurethane, modified styrene-butadiene rubber, derivatives or blocks and graft copolymers of the above polymers, and further preferably one or more of polypropylene, polyethylene, polyvinyl chloride, polyvinyl alcohol, polyvinyl, Modified polyurethane and one or more of the derivatives, blocks and graft copolymers of the polymer.
In the invention, in the conductive carbon coating, the addition amount of the conductive polymer is 0.01 to 40 parts, preferably 0.1 to 30 parts, more preferably 0.5 to 20 parts, and still more preferably 1.0 to 10 parts. In the invention, the conductive polymer comprises one or more of polythiophene, polypyrrole, polyaniline and derivatives, blocks and graft copolymers of the above polymers, preferably polypyrrole and/or polyaniline, and more preferably polyaniline.
In the conductive carbon coating, the addition amount of the conductive powder is 20 to 80 parts, preferably 25 to 75 parts, more preferably 35 to 65 parts, and still more preferably 50 parts. In the invention, the conductive powder comprises one or more of carbon black, acetylene black, a carbon nanotube, carbon fiber, graphite, nano graphite, graphene, fullerene and a conductive oxide, preferably one or more of carbon black, acetylene black, graphite, nano graphite and a conductive oxide, and further preferably one or more of carbon black, acetylene black and graphite.
In the conductive carbon coating, the addition amount of the crosslinking component is 0.01 to 10 parts, preferably 0.1 to 9 parts, more preferably 0.5 to 8 parts, and still more preferably 2 to 6 parts. In the present invention, the crosslinking component comprises diacetone acrylamide and/or polyacrylic acid-diacetone acrylamide resin-adipic dihydrazide co-crosslinker, preferably diacetone acrylamide.
In the present invention, the amount of the solvent added in the conductive carbon coating layer is 10 to 80 parts, preferably 20 to 70 parts, more preferably 30 to 60 parts, and still more preferably 45 parts. In the present invention, the solvent comprises one or more of N-methylpyrrolidone, water, isopropanol, and absolute ethanol, preferably one or more of N-methylpyrrolidone, water, and isopropanol, and more preferably water and/or isopropanol.
In the present invention, the addition amount of the leveling agent in the conductive carbon coating is 0.1 to 10 parts, preferably 2 to 8 parts, and more preferably 3 to 6 parts. In the invention, the leveling agent comprises one or more of isophorone, diacetone alcohol, ethylene glycol butyl ether, acrylic acid, organic silicon and fluorocarbon compounds, preferably one or more of ethylene glycol butyl ether, acrylic acid and fluorocarbon compounds, and more preferably ethylene glycol butyl ether.
In the invention, the thickness of the conductive carbon coating is 10-5000 nm, preferably 20-4000 nm, more preferably 30-3000 nm, and even more preferably 40-2000 nm.
In the invention, the metal of the conductive metal layer is preferably one or more of Al, Cu, Ni, Li, Ag, Fe and stainless steel.
In the present invention, the thickness of the metal layer is 1 to 10 μm, preferably 2 to 5 μm, and more preferably 2 μm.
The invention provides a preparation method of a flexible current collector with a composite structure, which comprises the following steps:
1) attaching conductive metal to the surface of a flexible non-conductive substrate to obtain a metal film layer current collector;
2) preparing conductive carbon coating slurry, coating the surface of the metal film layer current collector, and drying to obtain the composite structure flexible current collector;
in the step 1), the attachment comprises spraying or dry thermal compounding;
the spraying is to sequentially perform thermal spraying and hot pressing treatment on the surface of the flexible non-conductive base material to obtain a metal film layer current collector;
the dry thermal compounding is to carry out roughening pretreatment on the surface of the flexible non-conductive base material, then adopt a gravure printing or an overstock coating mode to coat thermosetting glue solution on the surface of the pretreated flexible non-conductive base material, and then compound the metal film with the coated flexible non-conductive base material in a heating mode to obtain the metal film layer current collector.
In the present invention, the thermal spraying includes electric arc spraying and/or plasma spraying.
In the invention, the temperature of the thermal spraying is 100-1000 ℃, and the speed of the thermal spraying is 10-80 s/m; preferably, the temperature of thermal spraying is 200-800 ℃, and the speed of thermal spraying is 40-120 s/min.
In the invention, the pressure of the hot-pressing treatment is 0.4-0.8 MPa, and the temperature of the hot-pressing treatment is 50-120 ℃; preferably, the pressure of the hot pressing treatment is 0.5-0.7 MPa, and the temperature of the hot pressing treatment is 60-90 ℃.
In the invention, the thermosetting glue solution comprises one or more of acrylic acid, epoxy resin, polyester resin, vinyl ester, bismaleimide, thermosetting polyimide, cyanate ester and polybutadiene resin, and preferably one or more of acrylic acid, epoxy resin, polyester resin, vinyl ester and thermosetting polyimide.
In the invention, the heating temperature is 50-120 ℃, and preferably 60-100 ℃.
In the invention, in the step 2), the coating speed is 1-180 m/min, preferably 2-150 m/min, and more preferably 10-140 m/min; the drying temperature is 50-200 ℃, preferably 60-150 ℃, and further preferably 100-120 ℃.
In the invention, in the step 2), the viscosity of the conductive carbon coating slurry is 10-2000 mPa & s, preferably 20-1900 mPa & s, more preferably 100-1800 mPa & s, and more preferably 200-1600 mPa & s; the solid content of the conductive carbon coating slurry is 2-35%, preferably 5-30%, further preferably 10-25%, and more preferably 15%; the pH value is 3 to 12, preferably 4 to 10, and more preferably 5 to 8.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
A preparation method of a flexible current collector with a composite structure comprises the following specific steps:
1) the flexible non-conductive base material adopts a PET film, the thickness of the PET film is 12 mu m, and the PET film is subjected to 60KW corona surface roughening treatment;
2) the method comprises the steps of heating Al powder particles to a semi-molten state at 300 ℃ by using a direct-current non-transferred plasma arc as a heat source through a plasma spraying method, spraying the Al powder particles to the surface of a pretreated flexible non-conductive base material at a high speed at a speed of 20s/m to form a conductive metal layer with firm adhesive force, and performing hot pressing treatment at 0.7MPa and 90 ℃ to obtain a metal film layer current collector, wherein the thickness of the conductive metal layer is 2 mu m.
3) Mixing 15 parts of isopropanol, 1.0 part of lithium carboxymethyl cellulose, 5 parts of isophorone and 25 parts of acetylene black, adding the mixture into a premixing dispersing machine for premixing for 1 hour, adding 0.05 part of polypyrrole and 2 parts of diacetone acrylamide into the dispersing machine for premixing for 2 hours, and obtaining premixed conductive carbon coating slurry; and adding the premixed conductive carbon coating slurry into a sand mill, and dispersing for 5 times to obtain the conductive carbon coating slurry.
4) Adding the conductive carbon coating slurry into a feeding barrel of a coating machine, pretreating a conductive metal layer by a corona treatment device with corona power of 40KW, coating by a normal phase printing coating machine, baking and drying by a drying oven at 90 ℃, coating at the speed of 150 m/min, rolling a finished product, and coating the conductive carbon coating with the thickness of 300nm to obtain the flexible current collector with the composite structure.
Comparative example
The current collector of the comparative example was prepared in the same manner as the current collector of example 1, except that the current collector of the comparative example was a non-metallic current collector prepared by a vacuum sputtering method without including a conductive carbon coating.
In order to test the performance of the two groups of prepared current collectors, the lithium iron phosphate anode slurry was coated on the two current collectors prepared in example 1 and the comparative example by using a transfer coater, dried, and then pressed by using a roll press to obtain an electrode plate.
Detecting the physical properties of the prepared electrode plate:
1. testing the resistance of the pole piece: the resistance of the rolled electrode sheet prepared in example 1 and having an area of 150 x 200mm was measured with a four-probe tester, and the spacing between each test point was 30mm, and 25 data were measured. The electrode sheet resistance prepared in example 1 is stable at 35.1 Ω, and the difference is not greater than 0.1 Ω, the electrode sheet resistance prepared in the comparative example fluctuates between 112-127 Ω, the average value is 121 Ω, and the difference reaches 15 Ω.
2. Mechanical properties: the peel strength of the electrode piece was tested by a 500N tensile testing machine, the peel strength of the electrode piece prepared in example 1 was 185.0N/m, and the peel strength of the electrode piece prepared in comparative example was 36N/m.
Example 2
A preparation method of a flexible current collector with a composite structure comprises the following specific steps:
1) the flexible non-conductive base material adopts a PE film with the thickness of 10 mu m, and the PE film is subjected to 20KW corona surface roughening treatment;
2) melting a Cu metal wire by using heat generated by electric arc by adopting an electric arc spraying method, wherein the melting temperature is 900 ℃, the melting part is sprayed to the surface of the pretreated flexible non-conductive base material by compressed air flow at the speed of 30s/m to form a compact conductive metal layer, and then hot-pressing treatment is carried out at the temperature of 0.6MPa and 70 ℃ to obtain a metal film layer current collector, wherein the thickness of the conductive metal layer is 3 mu m;
3) mixing 45 parts of absolute ethyl alcohol, 18 parts of polyacrylonitrile, 2 parts of diacetone alcohol and 50 parts of carbon black, adding the mixture into a premixing dispersion machine for premixing for 2 hours, adding 0.2 part of polyaniline and 0.5 part of diacetone acrylamide into the dispersion machine for premixing for 2 hours, and obtaining premixed conductive carbon coating slurry; and adding the premixed conductive carbon coating slurry into a ball mill, and dispersing for 4 times to obtain the conductive carbon coating slurry.
4) Adding the conductive carbon coating slurry into a feeding barrel of a coating machine, pretreating a conductive metal layer by a corona treatment device with corona power of 30KW, coating by a normal phase printing coating machine, baking and drying by a 100 ℃ baking oven at a coating speed of 180 m/min, rolling a finished product, and coating the conductive carbon coating with a thickness of 200nm to obtain the flexible current collector.
The current collector prepared in the example 2 is prepared into an electrode plate by adopting the same method as the example 1, the resistance of the tested electrode plate is 36.5 omega, the difference value is less than or equal to 0.1 omega, and the peel strength is 196.3N/m.
Example 3
A preparation method of a flexible current collector with a composite structure comprises the following specific steps:
1) the flexible non-conductive base material adopts a CPP film with the thickness of 9 mu m, and the CPP film is subjected to 30KW corona surface roughening treatment;
2) adopting a dry thermal compounding method to carry out roughening pretreatment on the surface of a flexible non-conductive substrate, then adopting a gravure printing or build-up coating mode to coat thermosetting glue solution on the surface of the pretreated flexible non-conductive substrate, and compounding a conductive metal film with the thickness of 20 mu m with the coated flexible non-conductive substrate at the temperature of 100 ℃ to obtain a metal film layer current collector;
3) mixing 60 parts of deionized water, 23 parts of polyethylene glycol, 5 parts of ethylene glycol butyl ether and 35 parts of graphite, adding the mixture into a premixing dispersing machine for premixing for 3 hours, adding 10 parts of polythiophene and 0.02 part of diacetone acrylamide into the dispersing machine for premixing for 2 hours, and obtaining premixed conductive carbon coating slurry; and adding the premixed conductive carbon coating slurry into a homogenizer, and dispersing for 5 times to obtain the conductive carbon coating slurry.
4) Adding conductive carbon coating slurry into a feeding barrel of a coating machine, pretreating a conductive metal layer by a corona treatment device with corona power of 20KW, coating by a normal phase printing type coating machine, baking and drying by an oven at 80 ℃, wherein the coating speed is 120 m/min, winding a finished product, and the thickness of the conductive carbon coating is 200nm to prepare the flexible current collector.
The current collector prepared in the example 3 is prepared into an electrode piece by adopting the same method as the example 1, the resistance of the tested electrode piece is 35.2 omega, the difference value is less than or equal to 0.1 omega, and the peel strength is 188.6N/m.
From the above embodiments, the present invention provides a flexible current collector with a composite structure and a preparation method thereof. According to the invention, by improving the compounding mode of the conductive metal layer and the flexible non-conductive base material and by a thermal spraying method and a dry thermal compounding method, the conductive metal is attached to the surface of the flexible non-conductive base material, so that the problems of interface and adhesion between the conductive metal layer and the electrode material layer are effectively solved, the connection between the flexible current collector and the electrode material coated on the surface of the current collector can be better realized, the large size change of the electrode material layer in the working process can be better adapted, meanwhile, the effective surface area of the current collector conducting electrons can be increased, the internal resistance of the battery is reduced, the heat productivity of the battery is reduced, the safety performance is further improved, and the advantages are favorable for improving the performance of an electrochemical system using the current collector. Compared with the prior art, the flexible current collector obtained by the invention has the advantages of lower cost, better adhesive force and more excellent electrochemical performance, and meanwhile, the safety performance of the battery can be better solved, and the flexible current collector is suitable for large-scale mass production.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The flexible current collector with the composite structure is characterized by comprising a flexible non-conductive base material, a conductive metal layer and a conductive carbon coating;
the flexible non-conductive substrate comprises one of polyethylene terephthalate, polyphenylene sulfide, polyether ether ketone, polypropylene, polyethylene, polyimide, o-phenylphenol, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polyacrylonitrile, polyacrylic acid, polyvinyl alcohol, polyethyleneimine, polyamide, polyphenylsulfone, polysulfone, ethylene-vinyl acetate copolymer and polystyrene; the thickness of the flexible non-conductive base material is 5-40 mu m;
the conductive carbon coating is prepared from the following raw materials in parts by mass: 0.1-40 parts of a high-molecular binder, 0.01-40 parts of a conductive polymer, 20-80 parts of a conductive powder, 0.01-10 parts of a crosslinking component, 10-80 parts of a solvent and 0.1-10 parts of a flatting agent; the thickness of the conductive carbon coating is 10-5000 nm.
2. The flexible current collector with the composite structure as claimed in claim 1, wherein the metal of the conductive metal layer comprises one or more of Al, Cu, Fe, Ni, Na, Li, Au, Ag and stainless steel, and the thickness of the metal layer is 1-10 μm.
3. The composite structure flexible current collector of claim 2, wherein the polymer binder comprises one or more of sodium carboxymethylcellulose, lithium carboxymethylcellulose, polyacrylic acid, polyamide, polyacrylamide, polyethylene glycol, polyacrylonitrile, polypropylene, polyethylene, polyvinyl chloride, polybutylene terephthalate, polyvinylidene fluoride, polyimide, epoxy resin, polyurethane, polyether ether ketone, polymethyl methacrylate, polyurethane, modified acrylic acid, modified polyurethane, modified styrene-butadiene rubber, and derivatives or blocks and graft copolymers of the above polymers.
4. The flexible current collector with a composite structure as claimed in any one of claims 1 to 3, wherein the conductive polymer comprises one or more of polythiophene, polypyrrole, polyaniline and derivatives, or block and graft copolymers of the above polymers;
the conductive powder comprises one or more of carbon black, acetylene black, carbon nanotubes, carbon fibers, graphite, nano graphite, graphene, fullerene and conductive oxides.
5. The composite structure flexible current collector of claim 4, wherein the crosslinking component comprises diacetone acrylamide and/or polyacrylic acid-diacetone acrylamide resin-adipic dihydrazide co-crosslinker;
the solvent comprises one or more of N-methyl pyrrolidone, water, isopropanol and absolute ethyl alcohol;
the flatting agent comprises one or more of isophorone, diacetone alcohol, ethylene glycol butyl ether, acrylic acid, organic silicon and fluorocarbon.
6. A method for preparing a composite structure flexible current collector as claimed in any one of claims 1 to 5, comprising the steps of:
1) attaching conductive metal to the surface of a flexible non-conductive substrate to obtain a metal film layer current collector;
2) preparing conductive carbon coating slurry, coating the surface of the metal film layer current collector, and drying to obtain the composite structure flexible current collector;
in the step 1), the attachment comprises spraying or dry thermal compounding;
the spraying is to sequentially perform thermal spraying and hot pressing treatment on the surface of the flexible non-conductive base material to obtain a metal film layer current collector;
the dry thermal compounding is to perform roughening pretreatment on the surface of the flexible non-conductive base material, then to coat thermosetting glue solution on the surface of the pretreated flexible non-conductive base material in a gravure printing or build-up coating mode, and then to compound the metal film with the coated flexible non-conductive base material in a heating mode to obtain the metal film layer current collector.
7. The preparation method according to claim 6, wherein the temperature of the thermal spraying is 100 to 1000 ℃, and the speed of the thermal spraying is 10 to 80 s/m; the pressure of the hot-pressing treatment is 0.4-0.8 MPa, and the temperature of the hot-pressing treatment is 50-100 ℃.
8. The preparation method of claim 6, wherein the thermosetting adhesive solution comprises one or more of acrylic acid, epoxy resin, polyester resin, vinyl ester, bismaleimide, thermosetting polyimide, cyanate ester and polybutadiene resin; the heating temperature is 50-120 ℃.
9. The method according to claim 6 or 8, wherein in the step 2), the coating speed is 1 to 180 m/min, and the drying temperature is 50 to 200 ℃.
10. The preparation method of claim 9, wherein in the step 2), the viscosity of the conductive carbon coating slurry is 10 to 2000 mPa-s, the solid content of the conductive carbon coating slurry is 2 to 35%, and the pH value is 3 to 12.
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| CN115846646A (en) * | 2022-12-09 | 2023-03-28 | 开封夸克新材料有限公司 | Modified PET flexible circuit board, preparation method and application 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 |
| WO2024089031A1 (en) * | 2022-10-25 | 2024-05-02 | Karlsruher Institut für Technologie | Cathode and method for producing same |
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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 |
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| CN115810759A (en) * | 2022-10-17 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Flexible composite current collector, preparation method thereof, pole piece and battery |
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