Silicon-carbon composite material and secondary battery

By generating lithium nitride with high ionic conductivity from silicon nitride in silicon-carbon composite materials, the problems of conductivity and volume expansion of elemental silicon are solved, and the performance of lithium-ion batteries is improved, especially specific capacity, rate performance and cycle performance.

WO2026006982A9PCT designated stage Publication Date: 2026-07-16NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NINGDE AMPEREX TECHNOLOGY LTD
Filing Date
2024-07-02
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

The low capacity and lithium dendrite safety hazards of existing lithium-ion battery anode materials such as graphite hinder their further application, while elemental silicon limits its large-scale application due to its poor conductivity and volume expansion problem.

Method used

By using a silicon-carbon composite material containing elemental silicon and silicon nitride, and by controlling the ratio of characteristic peak intensities and elemental content, lithium nitride with high ionic conductivity is generated, which buffers stress changes and improves conductivity and cycle performance.

Benefits of technology

It achieves high specific capacity, excellent rate performance and cycle performance, reduces volume expansion, and improves the energy density and safety of lithium-ion batteries.

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Abstract

A silicon-carbon composite material, a negative electrode sheet, and a secondary battery. The silicon-carbon composite material comprises elemental silicon and silicon nitride. The silicon-carbon composite material satisfies: 2≤α≤3, wherein the value of α represents the peak intensity ratio of ISi2p to IN1s, and ISi2p and IN1s are respectively the intensities of the characteristic peaks of the silicon-carbon composite material at 103±0.5 eV and 399±0.5 eV in an X-ray photoelectron spectrum. The silicon-carbon composite material has a relatively high specific capacity, and can also achieve good rate capability, cycling performance and expansion performance.
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