Electrode and lithium ion battery

By using polyamideimide and other low-impedance binders in the electrode active material layer of lithium-ion batteries, combined with water-soluble plasticizers, the performance problems caused by volume changes in the negative electrode active material of lithium-ion batteries are solved, and more efficient electrochemical performance and longer service life are achieved.

CN119993975APending Publication Date: 2025-05-13HU ZHOU YAO NING GU TAI DIAN CHI YAN JIU YUAN YOU XIAN GONG SI
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Patent Information

Application Number
CN202510090384.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-20
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

The volume of the negative electrode active substance of lithium-ion batteries changes greatly during the absorption and release process, resulting in micronization, current collector disengagement and current collector reduction, affecting the charge and discharge cycle characteristics. At the same time, commonly used binders such as polyimide binders are inconvenient to use, high cost and serious environmental pollution.

Method used

Polyamide imide is used as the first binder, and a second binder such as sodium carboxymethylcellulose, sodium alginate, etc. is introduced, and combined with a water-soluble plasticizer, pulping through water-based ingredients to reduce battery resistance, improve the mechanical strength of the electrode and the cycling performance of the battery.

Benefits of technology

It improves the charging and discharging power characteristics, low temperature performance and cycling performance of lithium-ion batteries, reduces battery internal resistance, reduces environmental pollution, and improves the service life of the battery.

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Abstract

The invention relates to the technical field of batteries, in particular to an electrode and a lithium ion battery. The electrode comprises an electrode active material layer, the electrode active material layer comprises an electrode active material, a first binder, a second binder and a plasticizer, the first binder comprises polyamide-imide, and the second binder comprises at least one of sodium carboxymethyl cellulose, sodium alginate, polyacrylic acid, polyvinyl alcohol and chitosan; a dispersion medium of the electrode active material layer comprises water; based on the total weight of the electrode active material layer, the content of the first binder is 0.2%-20%, and the content of the second binder is 0.1%-10%; the lithium ion secondary battery includes the electrode of the present invention. The lithium ion battery provided by the invention has good discharge power characteristic, long service life and cycle performance.
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