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Carbon-coated aluminum foil used for lithium battery and manufacturing method thereof

A lithium battery and aluminum foil technology, which is applied in the field of lithium-ion batteries, can solve the problems of no obvious improvement in the conductivity of carbon-coated aluminum foil, graphene modification, and no obvious improvement in the adhesion between the carbon-coated layer and the positive active material. Achieve the effects of improving multiple properties, improving electronic conductivity, and strong corrosion resistance

Active Publication Date: 2020-01-10
福建巨电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN107507981A discloses a carbon-coated current collector containing polydopamine, which coats polydopamine on the surface of the current collector and then coats a layer of graphene, but the improvement in the adhesion between the carbon-coated layer and the positive active material is not obvious , and without modifying graphene, it does not significantly help to improve the conductivity of carbon-coated aluminum foil

Method used

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  • Carbon-coated aluminum foil used for lithium battery and manufacturing method thereof
  • Carbon-coated aluminum foil used for lithium battery and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of carbon-coated aluminum foil for lithium batteries

[0024] (1) Aluminum foil surface coated with polydopamine layer: prepare 10 mmol / L Tris-HCl buffer solution, use 0.1 mol / L hydrochloric acid to adjust the pH of the buffer solution to 7.5, and then dissolve dopamine monomer in Tris-HCl buffer solution , dopamine solution; rinse the aluminum foil with deionized water for 10 min, put the aluminum foil into the prepared dopamine solution, place the solution in a constant temperature (25°C) shaker for 24 h, take out the aluminum foil and wash it with deionized water Rinse with water for 5 minutes, ultrasonically clean for 5 minutes, and dry to obtain an aluminum foil with a polydopamine layer formed on the surface;

[0025] (2) Preparation of cyclized polyacrylonitrile modified conductive carbon material: mix polyacrylonitrile (PAN) and graphene in DMF at a mass ratio of 2:8, and place the mixed material in a quartz tube , sintered at 240 °C f...

Embodiment 2

[0028] Embodiment 2: Preparation of carbon-coated aluminum foil for lithium batteries

[0029] (1) Aluminum foil surface coated with polydopamine layer: Prepare 15 mmol / L Tris-HCl buffer solution, use 0.1 mol / L hydrochloric acid to adjust the pH of the buffer solution to 8, and then dissolve dopamine monomer in Tris-HCl buffer solution , dopamine solution; rinse the aluminum foil with deionized water for 15 min, put the aluminum foil into the prepared dopamine solution, place the solution in a constant temperature (25°C) shaker for 30 h, take out the aluminum foil and wash it with deionized water Rinse with water for 7.5 minutes, ultrasonically clean for 7.5 minutes, and dry to obtain an aluminum foil with a polydopamine layer formed on the surface;

[0030] (2) Preparation of cyclized polyacrylonitrile modified conductive carbon material: mix polyacrylonitrile (PAN) and graphite in DMF at a mass ratio of 2.5:7.5, and place the mixed material in a quartz tube. Sinter at 260°C...

Embodiment 3

[0033] Embodiment 3: Preparation of carbon-coated aluminum foil for lithium batteries

[0034] (1) Aluminum foil surface coated with polydopamine layer: Prepare 20 mmol / L Tris-HCl buffer solution, use 0.1 mol / L hydrochloric acid to adjust the pH of the buffer solution to 8.5, and then dissolve dopamine monomer in Tris-HCl buffer solution , dopamine solution; rinse the aluminum foil with deionized water for 20 min, put the aluminum foil into the prepared dopamine solution, place the solution in a constant temperature (25°C) shaker for 36 h, take out the aluminum foil and wash it with deionized water Rinse with water for 10 minutes, ultrasonically clean for 10 minutes, and dry to obtain an aluminum foil with a polydopamine layer formed on the surface;

[0035] (2) Preparation of cyclized polyacrylonitrile modified conductive carbon material: mix polyacrylonitrile (PAN) and carbon nanotubes in DMF with a mass ratio of 3:7, and place the mixed material in a quartz tube , sintered...

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Abstract

The invention discloses a carbon-coated aluminum foil used for a lithium battery and a manufacturing method thereof. The carbon-coated aluminum foil successively comprises a polydopamine layer, a modified conductive coating, the polydopamine layer and an aluminum foil from outside to inside, and the modified conductive coating is made of a cyclized polyacrylonitrile (C-PAN) modified conductive carbon material which is taken as a raw material. A pi bond in a C-PAN chain can be used to improve an electronic conductivity characteristic of a conductive carbon material and conductivity of the carbon-coated aluminum foil is improved. The polydopamine layer formed through coating on a surface of the aluminum foil has good corrosion resistance, thermal conductivity and cohesiveness performance sothat the corrosion resistance and heat dissipation of the carbon-coated aluminum foil are improved, and the cohesiveness of the conductive coating with active substances and the aluminum foil can beincreased. Therefore, the manufactured carbon-coated aluminum foil has good conductivity, corrosion resistance, heat dissipation performance and cohesiveness performance, and can be widely applied tothe lithium ion battery field.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a carbon-coated aluminum foil for lithium batteries. Background technique [0002] Due to the advantages of high energy density, high voltage, wide operating temperature range, no memory effect, good cycle performance and long service life, lithium-ion batteries are widely used in different fields, such as digital products, power, energy storage and other fields. However, lithium batteries have the problems of poor conductivity, low rate performance, and poor heat dissipation performance, which affect their further promotion and application. By coating the surface of the aluminum foil with a conductive carbon layer, the polarization of the battery can be suppressed, the thermal effect can be reduced, and the rate performance of the battery can be improved. At the same time, the adhesion between the active material and the aluminum foil can be improved, and the amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/04H01M10/0525
CPCH01M4/667H01M4/661H01M4/663H01M4/0404H01M4/0471H01M10/0525Y02E60/10
Inventor 张筱烨张劢瞿诗鹏吴彬杰杨德财
Owner 福建巨电新能源股份有限公司
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