Binder, negative electrode, lithium ion battery, and electrochemical device
By forming a network structure through the crosslinking reaction of modified polyacrylonitrile, the problems of weak adhesion and poor mechanical properties of silicon-based anode binders are solved, thereby improving the cycle stability and rate performance of lithium-ion batteries.
CN116496728BActive Publication Date: 2026-06-23INST OF COAL CHEM CHINESE ACAD OF SCI
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF COAL CHEM CHINESE ACAD OF SCI
- Filing Date
- 2023-05-24
- Publication Date
- 2026-06-23
AI Technical Summary
Technical Problem
Existing binders have weak adhesion and poor mechanical properties in silicon-based anodes, and cannot effectively mitigate the damage to the electrode structure caused by volume expansion, thus affecting electrochemical performance.
Method used
Modified polyacrylonitrile is used as a binder, which forms a network structure through a cross-linking reaction. The cyano, carboxylate and amide groups interact strongly with silicon to enhance the bonding strength and mechanical properties.
Benefits of technology
It significantly improves the cycle stability and rate performance of lithium-ion batteries, especially for silicon anodes with large volume expansion, and the preparation process is simple, easy to operate, and inexpensive.
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Figure CN116496728B_ABST
Abstract
The application provides a preparation method of a binder, the binder is prepared from modified polyacrylonitrile through a cross-linking reaction and post-treatment; the modified polyacrylonitrile is a hydrolysis product of polyacrylonitrile, and the cross-linking agent of the cross-linking reaction is epichlorohydrin. The application also provides corresponding binders, lithium ion battery negative electrodes, lithium ion batteries and electrochemical devices. The binder of the application can significantly improve the cycle stability and rate performance of the battery, and the effect is particularly significant for a silicon negative electrode with large volume expansion. The preparation process of the binder of the application has the advantages of simple operation and low cost, and is easy to realize industrial production.
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