▎ 摘　　要

NOVELTY - Graphene/silicon composite microsphere includes a core-shell structure in which a graphene shell layer covers silicon particles. The graphene shell layer has a hollow fold structure with a thickness of 1- 10 nm. The diameter of the silicon particles is 10-3 mu m. The graphene shell layer is attached to the silicon particles. The graphene shell layer is elastic and can expand and contract to adapt to the volume expansion of the silicon particles. USE - Graphene/silicon composite microsphere used in battery positive electrode for battery (all claimed). ADVANTAGE - The graphene/silicon composite microsphere high filling ensures high capacity of battery materials, certain elasticity to withstand repeated charge and discharge of silicon particles without damage, and greatly guarantees stability of battery charge and discharge. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene/silicon composite microsphere, which involves: (A) steam fumigating graphene oxide pleated microspheres with hydrazine hydrate; (B) transferring to a hydrazine hydrate solution for reduction to obtain reduced graphene microspheres; (C) heat-treating the reduced graphene microspheres; (D) disperse the graphene microspheres heat-treated in a mixed solution composed of hydrogen peroxide and concentrated sulfuric acid; (E) filtering, cleaning, and dispersing in deionized water and hydrophobic organic solvent together with silicon powder and dispersant; (F) heating the graphene composite microspheres dehydrated; (G) drying at 300-600 degrees C in a reaction furnace; (H) heating up at 1300-1450 degrees C; and (I) holding for a period of time to obtain the closed graphene/silicon composite microspheres.