Negative electrode active material, secondary battery and electric device

By using particles with different silicon content in silicon-carbon composite materials, the problem of poor circulation stability of silicon-based negative electrode materials is solved, and a battery material with high capacity and good circulation stability is achieved.

WO2025112384A1PCT designated stage expired Publication Date: 2025-06-05CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
PCT/CN2024/095941
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-11-30
Filing Date
2024-05-29
Publication Date
2025-06-05

AI Technical Summary

Technical Problem

The volume expansion rate of the silicon-based negative electrode material is large during the circulation process, resulting in poor circulation stability, which in turn reduces the circulation performance of the battery.

Method used

A silicon-carbon composite material is used, which includes two silicon-carbon composite particles with different silicon contents. By adjusting the mass percentage of silicon elements and the pore structure of the carbon matrix, the capacity and cycle stability are improved.

Benefits of technology

It is achieved to improve the cycle stability and energy density of the battery while maintaining a high capacity and improve the cycle performance of the battery.

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Abstract

A negative electrode active material, a secondary battery and an electric device. The negative electrode active material comprises a silicon-carbon composite material, and the silicon-carbon composite material comprises first silicon-carbon composite particles and second silicon-carbon composite particles. The first silicon-carbon composite particles comprise a first carbon substrate having a pore structure and a first silicon-based material arranged in the pore structure of the first carbon substrate. The second silicon-carbon composite particles comprise a second carbon substrate having a pore structure and a second silicon-based material arranged in the pore structure of the second carbon substrate. In addition, the mass percentage content of silicon in the first silicon-carbon composite particles is greater than that of silicon in the second silicon-carbon composite particles. The silicon-carbon negative electrode material has both a relatively high gram capacity and good cycling stability, such that the energy density and cycling performance of the battery can be improved.
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Citation Information

Patent Citations

  • A lithium ion battery anode active material, a preparing method thereof, an anode and a lithium ion battery

    CN104518207A

  • Silicon-carbon composite material and preparation method thereof, negative active material, negative pole piece, secondary battery and power utilization device

    CN116387493A

  • Silicon-carbon negative electrode material and preparation method and application thereof

    CN117117159A

  • Negative electrode active material, negative electrode piece, electrochemical apparatus, and electronic apparatus

    WO2022178748A1

Cited By

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