SILICON-CARBON COMPOSITE MATERIAL, METHOD FOR PREPARING SILICON-CARBON COMPOSITE MATERIAL, NEGATIVE ELECTRODE PLATE, AND ELECTROCHEMICAL DEVICE

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 SiO, where 0