Composite silicon-carbon negative electrode material and preparation method thereof
By constructing a multi-level conductive network and enhancing interfacial compatibility in lithium-ion battery anode materials, the problems of low initial coulombic efficiency, insufficient cycle stability, and large electrode expansion rate of silicon-carbon anode materials have been solved, realizing a composite silicon-carbon anode material with high capacity, long cycle stability, and low expansion rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUIZHOU SAILIDA IND CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-07-17
AI Technical Summary
Existing silicon-carbon anode materials in lithium-ion batteries suffer from problems such as low initial coulombic efficiency, insufficient cycle stability, large electrode expansion rate, and poor capacity recovery, making it difficult to simultaneously achieve volume expansion buffering, interfacial bonding, and electrolyte adsorption and wetting functions.
The structure adopts a core of CVD silicon carbon, with an outer layer of composite conductive layer and graphite coating layer. A multi-level conductive network is constructed using modified conductive precursors, hydroxylated single-walled carbon nanotubes and modified graphite. Elastic polymers and highly absorbent polymer emulsions are introduced to enhance interfacial compatibility and electrolyte holding capacity.
It improves electron transport efficiency and active material utilization, enhances electrode structure stability, increases initial discharge specific capacity, coulombic efficiency and cycle capacity retention, reduces electrode expansion risk, and has good long-cycle stability and industrialization value.
Smart Images
Figure CN122417832A_ABST