Silicon-carbon composite material, method for preparing silicon-carbon composite material, negative electrode plate, and electrochemical device
AssigneeNingde Amperex Technology Limited
InventorsGuangwu Hu, Hang Cui, Yuansen Xie
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Abstract
A silicon-carbon composite material includes a core portion and a shell layer disposed on a surface of the core portion, where the core portion includes a silicon-based material and/or graphite, the shell layer includes a silicon-carbon composite, and the silicon-carbon composite includes a silicon-oxygen compound SiOx, where 0<x<2. The silicon-carbon composite material allows the electrochemical device to have both high energy density and long cycle life.
Claims20
A silicon-carbon composite material, comprising:
- a core portion, and a shell layer disposed on a surface of the core portion;
- wherein
- the core portion comprises a silicon-based material and/or graphite, the shell layer comprises a silicon-carbon composite, and the silicon-carbon composite comprises a silicon-oxygen compound SiOx, wherein 0<x<2.
An electrochemical device, comprising a positive electrode plate, a negative electrode plate, and an electrolyte;
- the negative electrode plate comprising a negative electrode current collector and a negative electrode active substance layer disposed on a surface of the negative electrode current collector;
- wherein the negative electrode active substance layer comprises a silicon-carbon composite material, and the silicon-carbon composite material comprises a core portion and a shell layer disposed on a surface of the core portion;
- wherein
- the core portion comprises a silicon-based material and/or graphite, the shell layer comprises a silicon-carbon composite, and the silicon-carbon composite comprises a silicon-oxygen compound SiOx, wherein 0<x<2.
Dependencies are inferred from the claim text.