Silicon-carbon negative electrode material and preparation method thereof

By employing a double-layer porous carbon matrix structure and conductive network in the silicon anode material of lithium-ion batteries, the volume expansion problem of silicon anode materials during charge and discharge processes has been solved, achieving battery performance with high specific capacity, long cycle performance, and high energy density.

CN122177775APending Publication Date: 2026-06-09HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date
2026-01-19
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing silicon anode materials for lithium-ion batteries suffer from large volume changes during charge and discharge, leading to damage and reconstruction of the SEI film, resulting in lithium-ion consumption and side reactions, which affect cycle performance and capacity decay.

Method used

It adopts a double-layer porous carbon matrix structure, with a core of highly cross-linked hard carbon and an outer shell of high-temperature treated soft carbon. It combines conductive agents to build a conductive network and coats nano-silicon particles to form a "steel-cement" type structure, which suppresses volume expansion and reduces side reactions.

Benefits of technology

It significantly improves the cycle performance and conductivity of silicon-carbon anode materials, maintains high specific capacity, extends battery life, and increases battery energy density and first coulombic efficiency.

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Abstract

This invention belongs to the technical field of lithium-ion battery anode materials, specifically relating to a silicon-carbon anode material and its preparation method. The silicon-carbon anode material comprises a porous carbon matrix, silicon particles, and a coated carbon layer, wherein the coated carbon layer coats the porous carbon matrix, and the silicon particles are deposited within the pores of the porous carbon matrix; the porous carbon matrix consists of a hard carbon core and a soft carbon shell, the soft carbon shell containing a conductive agent. This invention, through a multi-layer structure design, solves the technical problems of large volume expansion and poor cycle performance of traditional silicon-based anodes during charge and discharge.
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