Negative electrode material, negative electrode sheet, and secondary battery

CN122436449APending Publication Date: 2026-07-21BTR NEW MATERIAL GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BTR NEW MATERIAL GRP CO LTD
Filing Date
2025-01-21
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing anode materials composed of porous carbon materials and silicon-based materials suffer from volume expansion and insufficient lithium conductivity during charge and discharge processes.

Method used

A specific mass content of silicon-nitrogen material is introduced into a porous matrix to form a carbon-silicon-nitrogen composite material. The silicon-nitrogen material is converted into Li3N during the lithiation process to construct a lithium-ion conductive network. Combined with the electronic conductivity of carbon material, a uniform electron/lithium-ion transport network is formed, which enhances the mechanical strength and conductivity of the material.

Benefits of technology

It improves the anti-expansion performance, electronic conductivity, and lithium-ion conductivity of the anode material, enhances the cycle stability and fast-charging performance of the secondary battery, and extends battery life.

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Abstract

The application discloses a negative electrode material, a negative electrode sheet and a secondary battery, and relates to the technical field of secondary batteries. The negative electrode material comprises a porous matrix and an active material, and at least part of the active material is located in the pores of the porous matrix; the porous matrix comprises a carbon material and a silicon-nitrogen material; and the mass content of the silicon-nitrogen material in the negative electrode material is 0.5% to 15%. The secondary battery assembled by the negative electrode material has excellent anti-expansion performance, electronic conduction performance and lithium ion conduction performance.
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