Multilayer carbon-coated mesoporous silicon carbon negative electrode material and preparation method and application thereof

By employing a multilayer carbon-coated mesoporous silicon-carbon material preparation method, the problems of volume expansion and cycle stability of silicon-based anode materials in lithium-ion batteries were solved, thereby improving the electrochemical performance and first-cycle coulombic efficiency of the material.

CN122117823APending Publication Date: 2026-05-29LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411727332.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional graphite anode materials have low theoretical capacity. Silicon-based anodes suffer from severe volume expansion during lithium delithiation and lithium intercalation cycles, leading to repeated damage to the SEI film and electrode pulverization. Pure mesoporous silicon-carbon materials have low initial coulombic efficiency, large volume expansion, and poor cycle stability.

Method used

A multilayer carbon-coated mesoporous silicon-carbon material preparation method is adopted, which involves vapor deposition of nano-silicon particles to form a multilayer carbon-coated structure, and then combining graphene oxide and positively charged modifiers to form a nitrogen-doped graphene layer, thereby optimizing the material interface properties.

Benefits of technology

It improves the cycling stability and first-cycle coulombic efficiency of the material, reduces the formation of SEI film and irreversible capacity loss, and enhances conductivity and structural stability.

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Abstract

The embodiment of the invention relates to a multilayer carbon-coated mesoporous silicon carbon negative electrode material and a preparation method and application thereof, and the method comprises the following steps: under a protective atmosphere, introducing silicon source gas into a reaction container loaded with a mesoporous carbon matrix, so that the silicon source gas is subjected to vapor deposition on the mesoporous carbon matrix to obtain a mesoporous silicon carbon material; continuously introducing a first carbon source gas into the reaction container to form a first carbon layer so as to obtain a pre-coated mesoporous silicon carbon material; the preparation method comprises the following steps: dissolving graphene oxide and a positive electricity modifier in a solvent to obtain a mixed solution; adding a pre-coated meso-porous silicon carbon material into the graphene oxide, and carrying out spray drying treatment to obtain a graphene oxide / pre-coated meso-porous silicon carbon material; and introducing a protective gas into the reaction container, heating the reaction container to form a nitrogen-doped graphene layer, and then introducing a second carbon source gas into the reaction container to form a second carbon layer, thereby obtaining the multilayer carbon-coated mesoporous silicon carbon negative electrode material. The second carbon source gas is the same as the first carbon source gas.
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