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Fabrication method of conductive coating aluminum foil

A conductive coating, aluminum foil technology, applied in circuits, electrical components, battery electrodes, etc., to achieve the effect of improving electrical performance and consistency, improving adhesion, and large surface tension

Active Publication Date: 2016-08-24
合肥国轩精密涂布材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing a positive electrode conductive coating aluminum foil for a lithium ion battery, which solves the adhesion between the active material and the current collector in the lithium ion battery, and can effectively improve the cycle life of the battery and the battery impedance during the cycle The change

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] A preparation method of conductive coated aluminum foil, comprising the steps of:

[0023] (1) First pickling, alkali washing, and water washing respectively to remove impurities on the surface of the foil; after draining, place it at 400°C for high-temperature annealing treatment, so that uniform and dense pores are formed on the aluminum foil;

[0024] (2) One side of the aluminum foil treated in step (1) is coated with a layer of adhesive coating with a thickness of 1 μm by a coating machine roller; the adhesive coating is polyurethane conductive adhesive and cured cross-linked agent benzoyl peroxide, wherein the content of curing crosslinking agent benzoyl peroxide is 0.5wt%;

[0025] (3) Continue to pass another coating roller, and then coat a layer of conductive carbon coating with a thickness of 1 μm on the surface of the binder coating; the conductive carbon coating is composed of granular conductive carbon black and flake conductive graphite by mass The ratio ...

Embodiment 2

[0029] A preparation method of conductive coated aluminum foil, comprising the steps of:

[0030] (1) First pickling, alkali washing, and water washing respectively to remove impurities on the surface of the foil; after draining, place it at 600°C for high-temperature annealing treatment, so that uniform and dense pores are formed on the aluminum foil;

[0031] (2) One side of the aluminum foil treated in step (1) is coated with a layer of adhesive coating with a thickness of 2 μm by a coating machine roller; the adhesive coating is epoxy resin conductive adhesive and cured Cross-linking agent dicumyl hydroperoxide is composed of, wherein the content of curing cross-linking agent dicumyl hydroperoxide is 0.3wt%;

[0032] (3) Continue to pass another coating roller, and then coat a layer of conductive carbon coating with a thickness of 4 μm on the surface of the binder coating; the conductive carbon coating is composed of granular conductive carbon black and graphene in a mass ...

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Abstract

The invention provides a fabrication method of a conductive coating aluminum foil. The fabrication method comprises the following steps of (1) washing the aluminum foil, and carrying out high-temperature annealing processing; (2) applying a binding agent coating layer with the thickness of 1-2 micrometers onto one surface of the aluminum foil; (3) applying a conductive carbon coating layer with the thickness of 1-4 micrometers onto the surface of the binding agent coating layer; (4) placing the aluminum foil in a drying oven for drying so that the curing cross-linking reaction is generated between the conductive carbon coating layer and the binding agent coating layer; and (5), repeating the steps (2) to (4), sequentially applying the binding agent coating layer and the conductive carbon coating layer on the other surface of the aluminum foil, and curing the aluminum foil by the drying oven to obtain the conductive coating aluminum foil whose two surfaces are coated with the carbon coating layers. The conductive coating aluminum foil fabricated according to the method is high in surface tension and good in conductivity, and the electrical performance and the consistency of the fabricated battery finished product can be effectively improved.

Description

[0001] technical field [0002] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of conductive coated aluminum foil for lithium ion batteries. Background technique [0003] In recent years, the increasing energy and environmental problems have made lithium-ion batteries widely used in automobiles as a power source. higher requirements. [0004] At present, the traditional method of preparing pole pieces is to directly coat the active material on the surface of the aluminum foil current collector. mutual conversion of electric energy. The main defects of this method are: 1) There is a point contact between the active material and the rigid current collector, the interface impedance is large, and the DCR of the battery under dynamic conditions is large, that is, the battery generates large heat and the cycle life is limited; 2) The binder The bonding strength of the battery is limited. During the continuous charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66H01M10/0525
CPCH01M4/64H01M4/66H01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 陈萍张江伟李瑜李慧
Owner 合肥国轩精密涂布材料有限责任公司
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