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Copper foil surface passivation treatment method

A passivation treatment, copper foil technology, applied in anodizing, structural parts, lithium batteries, etc., can solve the problems of human body and environmental hazards, strong carcinogenicity of hexavalent chromium, etc., to improve performance and life, improve anti-oxidation ability , Improve the effect of isolation effect

Pending Publication Date: 2022-05-06
安徽华威铜箔科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] The above passivation method uses hexavalent chromium to passivate the surface of copper foil, but hexavalent chromium is highly carcinogenic and will cause serious harm to the human body and the environment

Method used

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Embodiment Construction

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] This embodiment provides a copper foil surface passivation treatment method, which includes the following steps:

[0023] (1) Configure passivation solution:

[0024] The passivation solution is composed of deionized water as the basic solvent, copper sulfate and phytic acid as additives, and the volume ratio of the deionized water to phytic acid with a concentration of 20-95% is: 1-10% deionized water : Phytic acid 90-99;

[0025] (2) Passivation treatment of copper foil surface:

[0026] Use the passivation solution prep...

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Abstract

According to the copper foil surface passivation treatment method, phytate is adopted as a passivation solution for copper foil surface passivation, after copper foil surface passivation, the technological step of copper foil surface rinsing is omitted, and compared with a traditional method that chromate is adopted as a passivation solution, water resources are saved by about 2 / 3 or above when the method is used for passivating each ton of copper foil; phytate is adopted as a passivation solution for passivating the surface of the copper foil, and no wastewater is generated in the whole treatment process. Besides, the adopted alloy liquid is mixed liquid formed by mixing alloy oxide and phosphoric acid to serve as a barrier layer, the isolation effect is improved, the oxidation resistance is improved, the copper foil prepared through the method is excellent in comprehensive performance, and when the copper foil serves as a lithium battery negative electrode current collector, the efficiency of a lithium battery can be improved, and the service life of the lithium battery can be prolonged.

Description

technical field [0001] The invention relates to the technical field of electrolytic copper foil production and manufacturing, in particular to a copper foil surface passivation treatment method. Background technique [0002] The existing copper foil surface treatment process can generally be summarized as: original foil - pretreatment - roughening - curing treatment - anti-oxidation treatment - surface treatment copper foil. [0003] Copper foil after "roughening-curing" treatment often encounters water vapor, dust, oxidation, and even fingerprint pollution from the external environment during transportation, storage, and copper clad laminate production operations, making the copper foil In addition, after the high-temperature pressing of the board and the high temperature in the processing of the PCB, the copper foil surface will appear local discoloration and form spots of copper oxide, and these changes on the copper foil surface will affect the reliability of the copper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/34H01M4/66H01M10/052
CPCC25D11/34H01M4/661H01M10/052
Inventor 陈韶明陈嘉豪黄河
Owner 安徽华威铜箔科技有限公司
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