Low-expansion silicon-carbon negative electrode material based on composite porous carbon substrate and preparation method thereof

By combining a composite porous carbon substrate with nano-silicon in the lithium-ion battery anode material, the problem of suppressing silicon volume expansion by the porous carbon framework was solved, realizing a high-strength, low-expansion silicon-carbon anode material, which improves the electrochemical performance and cycle stability of the battery.

CN122177778APending Publication Date: 2026-06-09NOVUSILICON CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NOVUSILICON CORP
Filing Date
2026-02-03
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing lithium-ion battery anode materials, the porous carbon framework has limited ability to suppress silicon volume expansion, resulting in insufficient structural support for silicon-carbon materials under high energy density requirements, making it difficult to meet the needs of long cycle life and high specific energy density.

Method used

A composite porous carbon substrate is used to form a high-strength composite porous carbon framework by mixing carbon precursors with high conductivity and high cross-linking degree, and then loading nano-silicon into it through CVD process to form a silicon-carbon anode material with low expansion, high initial efficiency and long cycle life.

Benefits of technology

It significantly suppressed the overall expansion of the electrode, improved the mechanical strength and conductivity of the material, extended the cycle life, enhanced the first coulombic efficiency and rate performance, and achieved high volumetric energy density.

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Abstract

This invention relates to the field of anode material technology, specifically disclosing a low-expansion silicon-carbon anode material based on a composite porous carbon substrate and its preparation method. The low-expansion silicon-carbon anode material consists of a high-strength, low-expansion composite porous carbon substrate, nano-silicon material deposited in the pores of the composite porous carbon substrate, and a carbon layer coating the surface of the composite porous carbon substrate. The composite porous carbon substrate is first formed by at least two precursor carbon sources with different chemical properties and molecular structures through a precursor composite method to form a composite carbon precursor, which is then obtained by heat treatment, crosslinking, carbonization, and pore formation. This invention provides a high-strength composite porous carbon framework based on a composite carbon precursor, in which nano-silicon is loaded using a CVD process, ultimately producing a silicon-carbon anode material with low expansion, high initial efficiency, and long cycle life.
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Citation Information

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