Preparation method of silicon-carbon negative electrode material based on organic matter pyrolysis modified porous carbon

By pyrolysis of organic matter to modify porous carbon materials, the problems of porous structure and surface chemistry of silicon-carbon composite anode materials are solved, efficient deposition and electrochemical performance of silicon-carbon anode materials are achieved, and the cycle stability and energy density of lithium-ion batteries are significantly improved.

CN119706807AActive Publication Date: 2025-03-28ZHEJIANG GEYUAN NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202510220405.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-27
Publication Date
2025-03-28
Estimated Expiration
2045-02-27

AI Technical Summary

Technical Problem

The existing silicon-carbon composite anode materials have problems such as pore structure, surface chemistry and silicon deposition efficiency in lithium-ion batteries, resulting in insufficient cyclic stability and energy density of the battery.

Method used

By pyrolyzing the porous carbon material with small molecule organic matter (such as alcohols, aldehydes, ketones and hydrocarbons), filling ultra-micropores, repairing pore wall defects, forming a dense carbon layer structure, and obtaining high-performance silicon-carbon anode material through silane deposition and carbon coating processes.

Benefits of technology

It significantly improves the first Coulomb efficiency and cyclic stability of silicon carbon anode material, reduces irreversible capacity loss, improves the conductivity and mechanical strength of the material, and meets the needs of high-energy-density lithium-ion batteries.

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Abstract

The invention relates to a preparation method of a silicon-carbon negative electrode material based on organic matter pyrolysis modified porous carbon, and the preparation method comprises the following steps: S1, carrying out activation pore-forming on a carbon raw material to obtain a porous carbon material; s2, placing the porous carbon material in an inert atmosphere, and performing high-temperature pretreatment; s3, performing pyrolysis modification on the pretreated porous carbon material in the presence of small organic molecule steam; s4, carrying out silicon vapor deposition on the modified porous carbon through silane gas to obtain a silicon-carbon precursor; and S5, coating the surface of the silicon-carbon precursor with carbon-containing gas at a high temperature to obtain the product silicon-carbon negative electrode material. Porous carbon is modified, ultramicropores are filled and defects in a pore wall carbon layer are repaired through pyrolysis of the small-molecular organic matter, a compact carbon layer structure is formed on the surface of the pore wall, the conductivity and mechanical strength of the material are improved, and irreversible capacity loss is reduced.
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