▎ 摘　　要

NOVELTY - Graphene composite microsphere conductive powder comprises graphene and ceramic microspheres having a porous structure on the surface, where ceramic microsphere comprises silicon carbide ceramic micro-sphere, silicon nitride ceramic microsphere, lime, ceramic microspheres, titanium dioxide ceramic microsphere and mullite ceramic microspheres. The grain diameter of ceramic microspheres is 5-10 microns and porosity is greater than or equal to 35%. USE - Graphene composite microsphere conductive powder for lithium battery. ADVANTAGE - The graphene composite microsphere conductive powder has good flow dispersity in the electrode active material of the lithium battery and increases the contact area of the graphene with electrode active material without consuming the large mass of the active material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene composite microsphere conductive powder which involves: (A) adding graphene precursor, oxidation accelerant, oxidant, an abrasive medium and de-ionized water into a sand mill and grinding for 1-2 hours, and filtering the ground medium to obtain graphene slurry; (B) mixing the graphene slurry with alkylamine and emulsifier, and dispersing for 10-15 minutes at 5000-12000 revolutions/minute in the dispersing machine; (C) adding ceramic microspheres and crosslinking agent, stirring at 400-800 revolutions/minute for 30-60 minutes to crosslink graphene slurry to the surface of porous structure of ceramic microsphere; and (D) filtering out liquid phase complex by high-pressure spray into the spray tower by swirling hot gas at high speed at 150-100 degrees C to obtain graphene composite microsphere conductive powder, where graphene precursor is expanded graphite, graphene nano sheet or high temperature cracking graphite, oxidation accelerant is ferric fluoride, ferric bromide, copper chloride, copper fluoride or copper bromide, oxidant is urea hydrogen peroxide, ammonium persulfate, ammonium thiosulfate, alkylamine, isostearamidopropyl dimethylamine, isostearamidopropyl morpholine or behenic amide propyl dimethylamine, emulsifier is fatty alcohol polyoxyethylene ether and crosslinking agent is dicumyl peroxide, benzoyl peroxide or di-tert.-butyl peroxide.