A nano-silicon-silicon monoxide negative electrode material with an inlay structure and a preparation method thereof

By preparing nano-silicon-silicon suboxide materials with an embedded structure, the capacity decay problem caused by volume changes in silicon-based anode materials was solved, realizing a high-efficiency and low-cost lithium-ion battery anode material, and improving electrochemical performance and cycle stability.

CN116314714BActive Publication Date: 2026-04-14ANHUI UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202310380501.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-11
Publication Date
2026-04-14
Estimated Expiration
2043-04-11

AI Technical Summary

Technical Problem

Silicon-based anode materials experience rapid capacity decay in lithium-ion batteries due to volume changes. Existing preparation methods are costly and dangerous, making commercial application difficult.

Method used

Nano-silica and Al powder are mixed and heat-treated in a tube furnace using a NaCl, KCl, and AlCl3 molten salt system to generate an embedded nano-silicon-silicon suboxide material. Al powder is used to reduce SiO2 to generate nano-silicon, which is then coated on the surface of silicon suboxide to limit volume expansion.

Benefits of technology

The prepared nano-silicon-silicon suboxide anode material exhibits excellent electrochemical performance in lithium-ion batteries, with improved cycle stability and rate performance. It is low in cost and easy to operate, making it suitable for commercial production.

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Abstract

The application belongs to the technical field of nanometer material preparation, and particularly relates to a kind of nanometer silicon-silicon monoxide negative electrode material with inlay structure and a preparation method thereof, wherein nanometer white carbon black is used as raw material, Al powder is used as reducing agent, NaCl, KCl and AlCl3 are used as auxiliary molten salt, the mixture is put into a tube furnace and heat treated in argon atmosphere, the heat treated product is soaked in hydrochloric acid to remove excess Al powder and molten salt, then repeatedly washed with distilled water and centrifuged, and vacuum dried to obtain the nanometer silicon-silicon monoxide negative electrode material with inlay structure. The preparation method is scientifically and reasonably designed, and the nanometer silicon is inlaid in silicon monoxide, which greatly limits the bulk expansion of nanometer silicon. When the material with this structure is used as battery negative electrode material, it can not only ensure that the theoretical specific capacity is higher than that of pure SiO x , but also can relieve the bulk expansion of pure silicon, so that the cycle stability and rate performance are more excellent.
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