A doped silicon-carbon composite material, its preparation method and application

By doping rare earth carboxylic acid compounds and silver onto the surface of nano-silicon, a fast-ion conductor layer is formed and coated with an amorphous carbon layer, solving the problems of poor power performance and low initial efficiency of silicon-based materials, and realizing a lithium-ion battery material with high energy density and fast charging performance.

CN116190599BActive Publication Date: 2026-05-26SHANXI WATEHEIMER NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANXI WATEHEIMER NEW MATERIAL TECH CO LTD
Filing Date
2022-12-29
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing silicon-based materials for lithium-ion batteries suffer from poor power performance and low initial efficiency. Especially under the demands of high energy density and fast charging, existing modification methods have failed to effectively address the expansion and insufficient electronic conductivity of silicon-based materials.

Method used

By doping rare earth carboxylic acid compounds and silver onto the surface of nano-silicon, a fast ion conductor layer is formed, and an amorphous carbon layer is coated on its surface to form a doped silicon-carbon composite material. The high transport rate and structural stability of the fast ion conductor, combined with the insulating effect of the amorphous carbon, improve the power performance and first-pass efficiency of the material.

Benefits of technology

This study achieves low volume expansion, high power performance, and high initial efficiency of silicon-carbon composite materials in lithium-ion batteries, while improving the cycle performance and electronic conductivity of the materials to meet the requirements of high energy density and fast charging.

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Abstract

This invention relates to the field of lithium-ion battery materials technology, specifically to a doped silicon-carbon composite material, its preparation method, and its application. The invention provides a method for preparing the doped silicon-carbon composite material, comprising the following steps: S1, adding nano-silicon, rare earth carboxylic acid compounds, silver, and amorphous carbon to a silane coupling agent solution, ball milling, and drying to obtain a doped silicon-carbon precursor material; S2, depositing a fast-ion conductor layer on the surface of the doped silicon-carbon precursor material using atomic vapor deposition to obtain a fast-ion conductor layer-coated composite material; S3, heating and carbonizing the fast-ion conductor layer-coated composite material in the presence of a carbon source to form an amorphous carbon layer, thus obtaining the doped silicon-carbon composite material. The multi-element doping, fast-ion conductor, and amorphous carbon coating work synergistically to improve the overall power performance, initial efficiency, and cycle performance of the material.
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