Preparation method of silicon-carbon negative electrode material and application thereof in lithium ion battery

Silicon-carbon materials were prepared by CVD and coated with PAA-modified CNTs to form a stable three-dimensional conductive network and a dense carbon layer. This solved the problems of volume expansion, poor conductivity and short cycle life of lithium-ion battery anode materials, and achieved a high-efficiency improvement in battery performance.

CN122158503APending Publication Date: 2026-06-05JIANGSU SUNPOWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU SUNPOWER
Filing Date
2025-12-24
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing lithium-ion battery anode materials suffer from problems such as volume expansion, poor conductivity, interface instability, and short cycle life, which are difficult to solve effectively with current technologies.

Method used

Silicon-carbon materials were prepared by CVD and coated with polyacrylic acid-modified carbon nanotubes to form a stable three-dimensional conductive network structure, which enhanced the interfacial bonding force and suppressed volume change, resulting in a dense carbon layer structure.

Benefits of technology

It significantly improves the conductivity and structural stability of the material, enhances the high-rate charge-discharge performance and cycle life of the battery, increases the initial efficiency by 15%, and achieves a capacity retention rate of over 90% after 500 cycles.

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Abstract

The application discloses a preparation method and application of a silicon-carbon negative electrode material and belongs to the technical field of lithium ion batteries. The silicon-carbon negative electrode material is prepared by using a gas deposition method and is pre-coated once, then polyacrylic acid and carboxylated carbon nanotubes are electrostatically self-assembled in an acidic environment to form a PAA-CNTs compound; the PAA-CNTs are uniformly coated on the surface of the silicon-carbon by spray drying, and the silicon-carbon negative electrode material coated with the polyacrylic acid modified carbon nanotubes is formed after surface modification treatment. The negative electrode material can effectively relieve the volume expansion of the material, improve the conductivity and cycle performance of the battery, and prolong the service life of the battery.
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