Negative electrode material, negative electrode sheet, and secondary battery
By coating the graphite core with an amorphous carbon layer and defining the orientation index, a core-shell structured anode material is formed, which solves the problems of capacity decay and poor cycle stability of anode materials in lithium-ion batteries, and achieves high-capacity and long-life battery performance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- BTR NEW MATERIAL GRP CO LTD
- Filing Date
- 2025-10-17
- Publication Date
- 2026-06-18
AI Technical Summary
Existing anode materials in lithium-ion batteries suffer from capacity decay and poor cycle stability, especially during long-cycle cycles, where the expansion and contraction of the graphite structure leads to rapid capacity decay.
By coating the graphite core with an amorphous carbon coating layer and limiting the compaction density and orientation index of the negative electrode material to 2–5, a core-shell structure is formed, which optimizes the microstructure, improves the lithium-ion diffusion rate, and reduces volume change.
It significantly improves the conductivity and cycle stability of the negative electrode material, reduces the expansion rate, maintains good dimensional stability, and improves the capacity and cycle life of the secondary battery.
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