CN106025290A - Carbon-ceramic coated aluminum foil current collector and preparation method thereof - Google Patents
Carbon-ceramic coated aluminum foil current collector and preparation method thereof Download PDFInfo
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- CN106025290A CN106025290A CN201610384366.2A CN201610384366A CN106025290A CN 106025290 A CN106025290 A CN 106025290A CN 201610384366 A CN201610384366 A CN 201610384366A CN 106025290 A CN106025290 A CN 106025290A
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- carbon
- current collector
- aluminum foil
- coated aluminum
- foil current
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- 239000000919 ceramic Substances 0.000 title claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 49
- 239000011888 foil Substances 0.000 title claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000007822 coupling agent Substances 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 238000007581 slurry coating method Methods 0.000 claims abstract description 7
- 239000000080 wetting agent Substances 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 46
- 229910052799 carbon Inorganic materials 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 239000005030 aluminium foil Substances 0.000 claims description 18
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
- 239000006229 carbon black Substances 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- -1 alkyl phenol Chemical compound 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229920000180 alkyd Polymers 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- LLYXJBROWQDVMI-UHFFFAOYSA-N 2-chloro-4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1Cl LLYXJBROWQDVMI-UHFFFAOYSA-N 0.000 claims description 2
- 229910017083 AlN Inorganic materials 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910005171 Si3O4 Inorganic materials 0.000 claims description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- 239000006230 acetylene black Substances 0.000 claims description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229920001289 polyvinyl ether Polymers 0.000 claims description 2
- 229910000077 silane Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 2
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical class [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000003575 carbonaceous material Substances 0.000 abstract 2
- 239000006256 anode slurry Substances 0.000 abstract 1
- 239000002518 antifoaming agent Substances 0.000 abstract 1
- 239000004576 sand Substances 0.000 description 8
- 239000003643 water by type Substances 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000005955 Ferric phosphate Substances 0.000 description 4
- 229940032958 ferric phosphate Drugs 0.000 description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 4
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a carbon-ceramic coated aluminum foil current collector and a preparation method thereof, wherein at least one surface of the aluminum foil of the current collector is coated with a slurry coating containing ceramic and carbon materials, and the slurry consists of the following components in percentage by weight: 1-20% of film-forming agent, 1-5% of ceramic particles, 1-20% of carbon material, 0.5-20% of dispersing agent, 0.5-4% of coupling agent, 40-95% of solvent, 0-0.3% of defoaming agent and 0-0.5% of base material wetting agent. The carbon-ceramic coated aluminum foil current collector has better solvent resistance and low resistance, has good compatibility with anode slurry taking N-methyl pyrrolidone as a solvent, is bonded compactly, and has the advantages of excellent stability, strong adhesion, low internal resistance, high specific capacity, good multiplying power performance and the like when being used as the current collector.
Description
Technical field
The invention belongs to field of lithium ion battery material, specifically a kind of carbon-ceramic coated aluminum foil current collector and
Preparation method.
Background technology
Along with the popularization of new-energy automobile, lithium ion battery has height ratio capacity, preferable voltage stability
With the advantage such as without memory, become the first-selection of electrokinetic cell.The particularity of the electrokinetic cell ratio to battery
Capacity, concordance and high rate capability are had higher requirement.Aluminium foil is as main in the market
Plus plate current-collecting body, positive electrode sticks on the aluminium foil that smooths.Both are by point cantact, and contact area is little,
Polarization resistance is high, and especially during high power charging-discharging, polarization increases, and temperature raises, and raw material easily comes off,
Have impact on the stability of battery.After aluminium foil surface increases by one layer of carbon transition zone, it is possible to decrease the internal resistance of cell.
Positive electrode is relatively big with the contact area of carbon coating aluminium foil collection liquid surface, improves adhesion and electric conductivity.
The use of carbon coat also reduces the fabrication error during battery makes, and improves battery consistency.
The coating of the aluminum foil current collector of carbon coating at present mainly use film former (such as polyurethane, acrylic acid tree
Fat, alkyd resin, epoxy resin etc.), material with carbon element (white carbon black, graphite, Graphene etc.) is composited.
Material with carbon element has stronger hydrophobicity, needs to add substantial amounts of film former guarantee and glues aluminum foil substrate
Attached property.General film-forming resin also has hydrophobicity, and coating wettability is bad.Coating making at electrokinetic cell
In with, poor thermal conductivity, electric conductivity is not enough, and decay resistance is undesirable.Along with service time of battery increases,
Coating stability reduces.These problems make battery performance receive large effect.
Based on film former, material with carbon element conductive coating in, film former is the most bad to the adhesion of carbon surface.
For ensureing adhesion, what film former addition accounted for conductive material more than 35% just has preferable filming performance,
And mechanical strength is not enough, the easy dry linting of cyclic process, affect battery life.
Ceramic particle rigidity is big, stable chemical nature, and wettability is good, and heat conductivity is high.A small amount of pottery
When grain adds in electrocondution slurry, electric conductivity will not be made a significant impact.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of mechanical strength height, the carbon-pottery of good stability
Coating aluminum foil current collector, this collector can be used for cobalt acid lithium, LiMn2O4, LiFePO4 and ternary material
Deng in the lithium ion battery of positive electrode, improve the electric conductivity of carbon coat aluminum foil current collector, thermally-stabilised
Property, mechanical performance and wettability.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of carbon-ceramic coated aluminum foil current collector, it is characterised in that in described current collector aluminum foil at least one side
Coating is containing pottery and the slurry coating of material with carbon element, and described slurry consists of the following components in percentage by weight:
Described film former be polyurethane, acrylic resin, polyester resin, epoxy resin, phenolic resin,
One or more in alkyd resin, acrylonitrile multiple copolymer.
Described material with carbon element be the one in white carbon black, SP, acetylene black, Graphene, graphite, CNT or
Multiple.
Described ceramic particle is Al2O3, BN, AlN, SiO2, Si3N4, ZnO, Si3O4, SiC, ZrO
In one or more.
Described coupling agent is silane coupler, titanate coupling agent, chromium complex coupling agent, aluminic acid chemical combination
One or more in compound coupling agent.
Described dispersant is supermolecule dispersant, alkyl phenol polyvinylether, alkyl polyoxyethylene ether, metal
One or more in phosphoric acid salt, polysiloxane-based dispersant.
Described solvent is that deionized water, benzene, dimethylbenzene, polynary alkane or boiling point are below 200 DEG C
One or more in alcohol, ether, ester.
The particle diameter of described material with carbon element and ceramic particle is below 2 μm.
A kind of preparation method of carbon-ceramic coated aluminum foil current collector, it is characterised in that described method include with
Lower step:
(1) dispersant is dissolved in solvent, adds defoamer, be uniformly mixed, add material with carbon element
And ceramic particle, pre-dispersed 0.5-2h under cooling condition, grind 3-10h, add coupling agent, film forming
Agent and substrate wetting agents, be sufficiently stirred for, and forms slurry；
(2) step (1) slurry is coated at least one surface of aluminium foil, under the conditions of 90-180 DEG C
It is dried 3-300s, obtains carbon-ceramic coated aluminum foil current collector.
The viscosity of described slurry is 20-2000mPa S, and the solid content of slurry is 3-60%.
Beneficial effects of the present invention: ceramic particle of the present invention is dispersed in material with carbon element gap, with coupling
The siloxy active force of agent is strong, and organic end of coupling agent cross-links with film former, forms fine and close network structure
Supporter, overcomes resin and is combined hypodynamic shortcoming with material with carbon element, significantly improve carbon-ceramic coated
The mechanical performance of layer aluminum foil current collector and stability, the interpolation of ceramic particle also add the heat conduction of coating
Property, ceramic grain surface tension force is little, good to the wettability of solvent, is coated with interlayer with positive pole and has the most viscous
Attached power；
Carbon of the present invention-ceramic coated aluminum foil current collector has preferable solvent resistance and a low resistive, and with
N-Methyl pyrrolidone is that the anode sizing agent compatibility of solvent is good, and bonding densification, when using as collector
Have excellent in stability, adhesion is strong, internal resistance is low, specific capacity is high and the advantage such as good rate capability.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 slurry grain size distribution.
Fig. 2 is the embodiment of the present invention 1 carbon-ceramic coated aluminum foil current collector with aluminium foil battery for 13Ah
The capacity comparison figure of different multiplying in ferric phosphate lithium cell.
Fig. 3 is that ceramic particle of the present invention filling forms the netted of crosslinking with film former, coupling agent in the coating
The schematic diagram of supporter.
In figure: 1-ceramic particle, 2-material with carbon element, 3-pottery, film former, coupling agent crosslinking points, 4-tree
Fat, 5-aluminum foil substrate.
Detailed description of the invention
Embodiment 1
A kind of carbon-ceramic coated aluminum foil current collector, in current collector aluminum foil at least one side, coating is containing pottery and carbon
The slurry coating of material, slurry consists of the following components in percentage by weight:
The preparation method of carbon-ceramic coated aluminum foil current collector:
Being dissolved in deionized water by polyvinylpyrrolidone dispersant, add defoamer, stirring mixing is all
Even, add Al2O3Granule, then add white carbon black, graphite flake in three times, under the conditions of 4 DEG C of circulating waters,
The pre-dispersed 1h of 1000r/min rotating speed；It is transferred in sand mill, sand milling 10h under the conditions of 4 DEG C of circulating waters,
Add coupling agent KH-550, emulsion acrylic resin, substrate wetting agents, be sufficiently stirred for, form slurry；
After tested, the solid content of this slurry is 14.5%, and the viscosity under 10/S shear rate is 26mPa S.
Use gravure coater to be coated on aluminium foil by above-mentioned slurry, under the conditions of 135 DEG C, be dried 10s,
Obtain carbon-ceramic coated aluminum foil current collector.
Embodiment 2
A kind of carbon-ceramic coated aluminum foil current collector, in current collector aluminum foil at least one side, coating is containing pottery and carbon
The slurry coating of material, slurry consists of the following components in percentage by weight:
The preparation method of carbon-ceramic coated aluminum foil current collector:
Being dissolved in deionized water by polyvinylpyrrolidone dispersant, add defoamer, stirring mixing is all
Even, add BN granule, then add white carbon black, Graphene in three times, under the conditions of 4 DEG C of circulating waters,
The pre-dispersed 2h of 1000r/min rotating speed；It is transferred in sand mill, sand milling 8h under the conditions of 4 DEG C of circulating waters,
Add coupling agent KH-560, aqueous polyurethane emulsion, substrate wetting agents, be sufficiently stirred for, form slurry；
After tested, the solid content of this slurry is 22%, and the viscosity under 10/S shear rate is 40mPa S.
Use gravure coater to be coated on aluminium foil by above-mentioned slurry, under the conditions of 150 DEG C, be dried 20s,
Obtain carbon-ceramic coated aluminum foil current collector.
Embodiment 3
A kind of carbon-ceramic coated aluminum foil current collector, in current collector aluminum foil at least one side, coating is containing pottery and carbon
The slurry coating of material, slurry consists of the following components in percentage by weight:
The preparation method of carbon-ceramic coated aluminum foil current collector:
Carbon black disperser is dissolved in dimethylbenzene, is uniformly mixed, add Si3N4Granule, then divide
Adding white carbon black, CNT three times, under the conditions of 4 DEG C of circulating waters, 1000r/min rotating speed is pre-dispersed
1.5h；It is transferred in sand mill, sand milling 8h under the conditions of 4 DEG C of circulating waters, addition titanate coupling agent,
Phenolic resin, is sufficiently stirred for, and forms slurry；After tested, the solid content of this slurry is 17%, at 10/S
Viscosity under shear rate is 200mPa S.
Use micro-gravure coater to be coated on aluminium foil by above-mentioned slurry, be dried under the conditions of 100 DEG C
100s, obtains carbon-ceramic coated aluminum foil current collector.
Embodiment 4
A kind of carbon-ceramic coated aluminum foil current collector, in current collector aluminum foil at least one side, coating is containing pottery and carbon
The slurry coating of material, slurry consists of the following components in percentage by weight:
The preparation method of carbon-ceramic coated aluminum foil current collector:
Carbon black disperser, polyvinylpyrrolidone dispersant are dissolved in benzene, add defoamer, stirring
Mix homogeneously, adds SiC particulate, then adds white carbon black, Graphene in three times, 4 DEG C of circulating water conditions
Under, the pre-dispersed 1h of 1000r/min rotating speed；It is transferred in sand mill, sand milling under the conditions of 4 DEG C of circulating waters
10h, adds coupling agent KH-550, acrylonitrile multiple copolymer water-based emulsion, substrate wetting agents, fully
Stirring, forms slurry；After tested, the solid content of this slurry is 16.5%, under 10/S shear rate
Viscosity is 600mPa S.
Use micro-gravure coater to be coated on aluminium foil by above-mentioned slurry, be dried under the conditions of 120 DEG C
60s, obtains carbon-ceramic coated aluminum foil current collector.
Fig. 1 is the embodiment of the present invention 1 slurry grain size distribution, and slurry particle diameter is little, and distribution is concentrated, mainly
Between 0.3-0.7 μm.
Table 1. non-dust cloth soakage water, NMP and electrolyte are in the power wiping 100 times of coating surface 10N
| Embodiment | 1 | 2 | 3 | 4 |
| Water wiping | Lossless | Lossless | Lossless | Lossless |
| NMP wiping | Lossless | Lossless | Lossless | Lossless |
| Electrolyte wiping | Lossless | Lossless | Lossless | Lossless |
The solvent resistant of the carbon-ceramic coated aluminium foil coating of the embodiment of the present invention 1 preparation and mechanical performance such as table 1
Shown in.Find out coating prepared by the method under the wiping of the non-dust cloth of the infiltration solvent of certain effect power,
Keep excellent adhesiveness and integrity, it is ensured that the mechanical performance during processing and using and stability
Energy.
Table 2.13Ah ferric phosphate lithium cell internal resistance
| Embodiment | 1 | 2 | 3 | 4 | Aluminium foil |
| Internal resistance (m Ω) | 4.58 | 4.52 | 4.33 | 4.60 | 7.93 |
Capability retention after table 3.13Ah ferric phosphate lithium cell 1C circulation 100 circle
| Embodiment | 1 | 2 | 3 | 4 | Aluminium foil |
| Capability retention | 98.83% | 98.77% | 98.86% | 98.67% | 96.28% |
Table 2 illustrate the carbon-ceramic coated aluminium foil of the embodiment of the present invention 1 for ferric phosphate lithium cell to internal resistance
Improvement result.Relative to common aluminium foil plus plate current-collecting body, this carbon coating aluminum foil current collector significantly reduces
The internal resistance of cell.Table 3 indicates this carbon-ceramic coated aluminum foil current collector to be had preferably capability retention
Effect.
Fig. 2 is the embodiment of the present invention 1 carbon-ceramic coated aluminum foil current collector with aluminium foil collector difference times
Capacity under rate plays situation.Therefrom finding out, the carbon of the present invention-ceramic coated aluminum foil current collector has preferably
High rate performance, relative to common aluminium foil collector, high rate capability improves substantially.
Fig. 3 is that ceramic particle fills the mesh support cross-linked in the coating with film former, coupling agent formation
Schematic diagram.Coupling agent is crosslinked together by the high forces of chemical bond with pottery and interlaminar resin, is being coated with
As mesh support in Ceng, enhance the mechanical performance of conductive coating.
Above content is only to present configuration example and explanation, the skill of affiliated the art
Described specific embodiment is made various amendment or supplements or use similar mode to replace by art personnel
Generation, without departing from invention structure or surmount scope defined in the claims, all should belong to
Protection scope of the present invention.
Claims (10)
1. carbon-ceramic coated aluminum foil current collector, it is characterised in that in described current collector aluminum foil at least one side, coating is containing pottery and the slurry coating of material with carbon element, and described slurry consists of the following components in percentage by weight:
Film former 1-20%
Ceramic particle 1-5%
Material with carbon element 1-20%
Dispersant 0.5-20%
Coupling agent 0.5-4%
Solvent 40-95%
Defoamer 0-0.3%
Substrate wetting agents 0-0.5%.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described film former is one or more in polyurethane, acrylic resin, polyester resin, epoxy resin, phenolic resin, alkyd resin, acrylonitrile multiple copolymer.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described material with carbon element is one or more in white carbon black, SP, acetylene black, Graphene, graphite, CNT.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described ceramic particle is Al2O3, BN, AlN, SiO2, Si3N4, ZnO, Si3O4, one or more in SiC, ZrO.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described coupling agent is one or more in silane coupler, titanate coupling agent, chromium complex coupling agent, aluminated compound coupling agent.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described dispersant is one or more in supermolecule dispersant, alkyl phenol polyvinylether, alkyl polyoxyethylene ether, metal tripolyphosphate salt, polysiloxane-based dispersant.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that described solvent is one or more in deionized water, benzene, dimethylbenzene, polynary alkane or the boiling point alcohol below 200 DEG C, ether, ester.
Carbon the most according to claim 1-ceramic coated aluminum foil current collector, it is characterised in that the particle diameter of described material with carbon element and ceramic particle is below 2 μm.
9. the method preparing carbon as claimed in claim 1-ceramic coated aluminum foil current collector, it is characterised in that said method comprising the steps of:
(1) dispersant is dissolved in solvent, adds defoamer, be uniformly mixed, add material with carbon element and ceramic particle, pre-dispersed 0.5-2h under cooling condition, grind 3-10h, add coupling agent, film former and substrate wetting agents, be sufficiently stirred for, form slurry；
(2) step (1) slurry is coated at least one surface of aluminium foil, under the conditions of 90-180 DEG C, is dried 3-300s, obtains carbon-ceramic coated aluminum foil current collector.
Method the most according to claim 9, it is characterised in that the viscosity of described slurry is 20-2000mPa S, the solid content of slurry is 3-60%.
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