Composite electrode material, preparation method thereof, negative electrode sheet and solid-state battery
By using a composite structure of porous silicon nanosheets, a uniform and dense carbon shell, and a phosphorus-doped silicon framework, combined with copper nanoparticle conductive bridges, the volume expansion and conductivity issues of silicon-based anode materials were solved, achieving efficient electron/ion transport and structural stability, thus improving the performance of solid-state batteries.
Patent Information
- Application Number
- CN202610734541.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-26
- Publication Date
- 2026-07-17
AI Technical Summary
Existing silicon-based anode materials exhibit severe volume expansion during lithium insertion/extraction, leading to structural pulverization, low electronic conductivity, and low ion diffusion coefficient. Traditional modification methods have limited effectiveness, making it difficult to construct stable and efficient composite structures.
A porous silicon nanosheet structure is used to provide an expansion buffer space, a uniform and dense carbon shell is used for mechanical constraint, a phosphorus-doped silicon framework is constructed to improve conductivity, and a three-dimensional conductive network is constructed through a continuous carbon shell, with copper nanoparticles embedded to form dot-like conductive bridges, thus forming a triple conductive pathway.
It effectively suppresses volume expansion, stabilizes the solid electrolyte interface film, improves electron/ion transport efficiency, enhances structural stability, and increases battery capacity and cycle life.
Smart Images
Figure SMS_1 
Figure SMS_2