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A kind of preparation method of mesh copper foil for lithium ion battery

A lithium-ion battery and copper foil technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of burrs on the surface of through holes, high precision of abrasive tools, and easy deformation of holes, so as to achieve regular hole shape, High production efficiency, improved charge and discharge performance and energy density

Active Publication Date: 2020-12-18
梅州市嘉应学院教育科研服务公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a preparation method of mesh copper foil for lithium-ion batteries in view of the above-mentioned deficiencies in the prior art, so as to solve the problem that the grinding tools in the prior art require high precision, easy deformation of punching holes, and cracks on the surface of the through holes. Burrs, easy to break when peeling off, high cost, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] A kind of preparation method of reticular copper foil for lithium ion battery of the present invention, the method comprises the following steps:

[0035] (1) The surface of the copper foil is activated and cleaned by using a dilute sulfuric acid solution with a concentration of 2-10% to obtain a fully roughened surface with good adhesion to the photosensitive dry film.

[0036] (2) Using an automatic film laminating machine at a pressure roller temperature of 100-130°C and a pressure of 3-6kg / cm 2 The photosensitive dry film is pasted on the copper foil after activation and cleaning under certain conditions; the thickness of the photosensitive dry film is 10-40 μm, and then exposure and development are carried out; the exposure is using a laser exposure machine under ultraviolet light with a wavelength of 325-365 nm To expose, the exposure tool is a film film, and the light-transmitting area of ​​the film film undergoes a cross-linking polymerization reaction under the...

Embodiment 1

[0041] A preparation method of mesh copper foil for lithium ion battery, the method comprises the steps of:

[0042] (1) using a dilute sulfuric acid solution with a concentration of 2% to activate and clean the surface of the copper foil;

[0043] (2) Using an automatic film laminating machine at a pressure roller temperature of 100°C and a pressure of 3kg / cm 2 The photosensitive dry film is pasted on the copper foil after activation and cleaning under certain conditions; the thickness of the photosensitive dry film is 10 μm, and then exposure and development are carried out; ; The development is the use of a concentration of 1.2% Na 2 CO 3 The solution acts as a developer for development.

[0044] (3) Etching the developed copper foil with an etchant, and performing stripping and cleaning in sequence after etching; the stripping is to use a NaOH solution with a concentration of 1% as the stripping solution to strip the strip. Described etchant is with HCl and CuCl 2 The...

Embodiment 2

[0048] A preparation method of mesh copper foil for lithium ion battery, the method comprises the steps of:

[0049] (1) using a dilute sulfuric acid solution with a concentration of 5% to activate and clean the surface of the copper foil;

[0050] (2) Using an automatic film laminating machine at a pressure roller temperature of 120°C and a pressure of 4kg / cm 2 The photosensitive dry film is pasted on the copper foil after activation and cleaning under certain conditions; the thickness of the photosensitive dry film is 20 μm, and then it is exposed and developed; ; The development is using a concentration of 1.0% K 2 CO 3 The solution acts as a developer for development.

[0051] (3) Etching the developed copper foil with an etchant, followed by film removal and cleaning after etching; the film removal is performed using NaOH solution with a concentration of 3% as the film removal solution. The etching solution is CuCl 2 , NH 3 ·H 2 O and NH 4 Alkaline etching solutio...

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Abstract

The invention discloses a preparation method of a net-shaped copper foil for a lithium ion battery, belonging to the technical field of the preparation of lithium ion batteries. The preparation methodis characterized by comprising the following steps: (1) carrying out activated cleaning treatment on the surface of a copper foil; (2) pasting a sensitization dry film to the activated cleaned copperfoil, and carrying out exposure development; (3) etching the developed copper foil, and sequentially carrying out film striping and cleaning; and (4) carrying out surface passivation on the cleaned copper foil by virtue of passivation liquid, and carrying out washing and drying, so as to obtain the net-shaped copper foil. The preparation method has the beneficial effects that the requirements ona grinding mill is relatively low in requirement, a punched hole is unlikely to be deformed, no burr is formed on the surface of a through hole, the copper foil is unlikely to be worn during the striping, and the cost is relatively low; and the preparation method is used for preparing the net-shaped copper foil.

Description

technical field [0001] The invention relates to a method for preparing copper foil, and more specifically, relates to a method for preparing mesh copper foil for lithium ion batteries. Background technique [0002] The wide application of lithium-ion secondary batteries in the fields of communication, transportation, electronics, aerospace and other fields has promoted the demand for copper foil, the main material of the negative electrode collector of lithium batteries. The performance of copper foil will directly affect the production process of lithium-ion batteries , performance and production costs. The market's higher and higher requirements for lithium-ion batteries will definitely promote the development of electrolytic copper foil in the direction of better performance (high tensile strength, high electrical conductivity and high temperature oxidation resistance, etc.), thinner thickness and lower cost. [0003] The mesh copper foil can be connected to the reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/18C23F1/34C23C22/63C23C22/08H01M4/66H01M4/80
CPCC23C22/08C23C22/63C23F1/18C23F1/34H01M4/661H01M4/80Y02E60/10
Inventor 唐春保刘燕杨木强谢静静王永森刘龙方
Owner 梅州市嘉应学院教育科研服务公司
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