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Ultrathin copper foil for producing lithium ion battery through electrolytic calendering and preparation method thereof

A technology of ultra-thin copper foil and electrolytic compression, which is applied in the direction of electrolysis, secondary batteries, battery electrodes, etc., can solve the problems of difficult production of rolled copper foil, high cost, inconsistent internal stress on both sides of electrolytic copper foil, etc., to achieve The effect of high strength, high ductility and low cost

Inactive Publication Date: 2020-01-03
安徽华创新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No one has ever tried to combine electrolytic copper foil and calendered copper foil. This invention cleverly uses electrolytic copper foil to produce copper foil with a certain thickness, which solves the problem of high difficulty and high cost of calendered copper foil. Rolling copper foil solves the defect of inconsistent internal stress on both sides of electrolytic copper foil, not only retains the advantages of electrolytic copper foil and rolled copper foil, but also overcomes the shortcomings of both

Method used

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  • Ultrathin copper foil for producing lithium ion battery through electrolytic calendering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: A preparation method for producing ultra-thin copper foil for lithium-ion batteries by electrolytic calendering, which includes the following steps: an electrolytic raw foil machine produces 9 μm double-sided photoelectrolytic copper foil, and the copper-dissolving parameter: Cu2+: 85 ~95g / L; H2SO4: 100~110g / L; Cl-: 5~15mg / L; then use a six-roll rolling mill at a speed of 650mm / min to roll double-sided photoelectrolytic copper foil, and then roll it into 6μm copper foil , after surface cleaning, cut into finished copper foil rolls.

Embodiment 2

[0013] Embodiment 2: A preparation method for producing ultra-thin copper foil for lithium-ion batteries by electrolytic calendering, which comprises the following steps: the electrolytic raw foil machine produces 70 μm double-sided photoelectrolytic copper foil, and the copper-dissolving parameter: Cu2+: 70 ~110g / L; H2SO4: 80~130g / L; Cl-: 5~40mg / L; then use a 20-roll rolling mill at a speed of 850mm / min to roll double-sided photoelectrolytic copper foil, and then roll it into 8μm copper foil Foil, surface cleaned and cut into finished copper foil rolls.

[0014] Ultra-thin 6um copper foil was made by the above preparation method, and the test data are shown in the table below:

[0015]

[0016] After analysis, the performance of the experimental copper foil test all met the requirements, and there was no folding phenomenon in winding.

[0017] Ultra-thin 6um copper foil was made by the above preparation method, and the test data are shown in the table below:

[0018] ...

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Abstract

The invention discloses ultrathin copper foil for producing a lithium ion battery through electrolytic calendering and a preparation method thereof. The method comprises the following steps: 9 [mu]m-70 [mu]m double-sided photoelectrolysis copper foil is manufactured by an electrolytic foil forming machine, is rolled and thinned into 6 [mu]m-8 [mu]m copper foil through a rolling mill, and is cut into finished copper foil coils after surface cleaning. The ultrathin copper foil for producing the lithium ion battery through electrolytic calendering and the preparation method thereof have the beneficial effects that the double-sided photoelectrolysis copper foil is firstly prepared by utilizing the electrolytic foil forming machine, the cost is low, the production efficiency is greatly increased, the production cost is reduced, the defect that copper foil is directly rolled by utilizing a traditional thick copper plate and a copper ingot is abandoned, the double-sided photoelectrolysis copper foil is rolled by utilizing the rolling mill, and the high-end copper foil with the same double-sided crystal grain structure, high strength and high ductility can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery production, in particular to an ultra-thin copper foil for lithium-ion batteries and a preparation method thereof. Background technique [0002] Ultra-thin copper foil for lithium-ion batteries is one of the most important parts in the lithium-ion battery manufacturing industry. It is used as the negative electrode collector of lithium-ion batteries. There are generally two manufacturing methods for ultra-thin copper foil for lithium-ion batteries. One is the electrolysis method and the other is the calendering method. The electrolysis method is to dissolve copper to make liquid to generate copper ions, and then reduce the copper ions to copper atoms by the action of the raw foil DC electric field, peel them off on the cathode roller, and cut them into finished rolls after passivation treatment; the calendering method is to use copper ingots Heating, planing and descaling of copper in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/04B21B1/40H01M4/66H01M10/0525
CPCB21B1/40C25D1/04H01M4/661H01M10/0525Y02E60/10
Inventor 徐龙徐辉
Owner 安徽华创新材料股份有限公司