Preparation method of graphene-silicon carbon lithium ion battery negative electrode material

The invention relates to the technical field of preparation of an electrode material, and specifically relates to a preparation method of a graphene-silicon carbon lithium ion battery negative electrode material. The preparation method comprises the following steps of performing graphene coating on nanometer silicon particles, preparing a carbon coated primary composite material, and performing carbonization and mixing. Nanometer silicon is dispersed into interlayer or surfaces of the graphene sheets to form a spherical-like graphene/nanometer silicon composite material; by virtue of high mechanical performance and flexibility of graphene, deformation stress of silicon can be relieved, and by virtue of excellent conductivity and heat conducting performance, quick electron conduction and heat evacuation can be provided; after heat treatment, the carbon-coated primary composite material can be prepared through growth of carbon microspheres; by virtue of the formed carbon coating layer, direct contact between si