Silicon-based material, method for preparing the same, secondary battery, and electric device

By using a core-shell structured silicon-based material in the active material layer of the negative electrode of a secondary battery, and coating it with organic compounds containing nitrogen, fluorine, and sulfonyl groups to form a stable SEI layer, the problem of insufficient fast charging capability of secondary batteries is solved, and the charging speed and energy density are improved.

CN122455702APending Publication Date: 2026-07-24CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-01-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The insufficient fast-charging capability of existing secondary batteries hinders their application in clean energy and electric equipment.

Method used

A silicon-based material with a core-shell structure is used as the active material layer of the negative electrode. The coating layer contains organic matter with nitrogen, fluorine and sulfonyl groups, forming an SEI layer rich in inorganic substances such as Li2S, LiF and Li3N, which improves ionic conductivity and promotes desolvation reaction.

Benefits of technology

It improves the fast charging performance of secondary batteries while taking into account energy density and lifespan.

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Abstract

The application discloses a silicon-based material and a preparation method thereof, a secondary battery and an electric device, and relates to the technical field of batteries. The secondary battery comprises a positive electrode sheet, a negative electrode sheet and an electrolyte. The negative electrode sheet comprises a current collector and an active material layer arranged on the current collector. At least one layer of the active material layer comprises a silicon-based material with a core-shell structure. The silicon-based material comprises a core and a coating layer at least partially covering the core. The coating layer comprises an organic substance containing at least one of nitrogen, fluorine and a sulfonyl group. The application can improve the rapid charging performance of the secondary battery.
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