Silicon-carbon composite material, negative electrode sheet and battery

By dispersing silicon nanoparticles in a hierarchically porous carbon material and coating it with an amorphous carbon layer, the silicon-carbon composite material solves the volume expansion and aggregation problems of silicon-based negative electrode materials in lithium-ion batteries, achieving efficient and stable battery performance.

WO2025200653A1PCT designated stage Publication Date: 2025-10-02ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Application Number
PCT/CN2024/142650
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-26
Filing Date
2024-12-26
Publication Date
2025-10-02

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Abstract

A silicon-carbon composite material, a negative electrode sheet and a battery. The silicon-carbon composite material comprises a hierarchically porous carbon material, silicon nanoparticles dispersed in pore channels of the hierarchically porous carbon material, and an amorphous carbon layer that coats a surface of the hierarchically porous carbon material, wherein the porous structure of the hierarchically porous carbon material comprises micropores, mesopores and macropores, the pore volume is 0.4 cm3 / g to 1.5 cm3 / g, and the pore volume of the micropores accounts for 60% to 92% of the total pore volume. The silicon-carbon composite material can effectively inhibit the aggregation of the silicon nanoparticles and reduce the phenomenon of stress concentration; and when the silicon-carbon composite material is used as a negative electrode active material for the preparation of a battery, better first-cycle efficiency, a lower expansion rate and a higher cycling stability can be obtained.
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Citation Information

Patent Citations

  • Negative electrode material and battery comprising same

    CN114335533A

  • Negative electrode material, negative electrode plate and battery

    CN116053447A

  • Silicon-carbon composite material as well as preparation method and application thereof

    CN116259727A

  • Negative electrode material, negative electrode plate and battery

    CN116470015A

  • Silicon-carbon negative electrode material and preparation method thereof

    CN116826017A

Cited By

  • Charge-discharge low-expansion spherical silicon-carbon composite negative electrode material and preparation method thereof

    CN121076116A