COMPOSITE NEGATIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR AND LITHIUM BATTERY

Provided are a composite negative electrode material, a preparation method therefor and a lithium battery. The composite negative electrode material comprises silicon-containing particles and a carbon coating layer coating at least part of the surface of silicon-containing particles. In Raman spectrum, the composite negative electrode material has a silicon characteristic peak A between 450 cm-550 cm, a carbon characteristic peak B between 1300 cm-1400 cm, a carbon characteristic peak C between 1530 cm-1630 cm, and a graphene structure characteristic peak D between 2500 cm-2750 cm. The preparation method comprises: in protective atmosphere, introducing reaction gas to react with silicon-containing particles, the reaction temperature being 700° C.-1450° C., and the reaction gas comprising a carbon-containing gas, so that at least part of the surface of silicon-containing particles form a carbon coating layer, so as to obtain the composite negative electrode material.