▎ 摘　　要

NOVELTY - Preparation of graphene composite material comprises adding graphite material into an electrolyte solution, standing for 1-5 days to cause cation in the electrolyte solution to penetrate into the graphite material layer to obtain intercalation graphite, separating, removing the intercalated graphite, blending intercalated graphite and metal cation salt into continuous screw reaction extruder and extruding. USE - Method for preparing graphene composite material for light conversion energy storage (claimed). ADVANTAGE - The method is simple, low-cost and suitable for continuous industrial production process and has less device requirements. DETAILED DESCRIPTION - Preparation of graphene composite material comprises adding graphite material into an electrolyte solution, standing for 1-5 days to cause cation in the electrolyte solution to penetrate into the graphite material layer to obtain intercalation graphite, separating, removing the intercalated graphite where mass ratio of graphite material and electrolyte solution is 1:2-5 and concentration of electrolyte solution is 20-60 mg/L, blending intercalated graphite and metal cation salt into continuous screw reaction extruder to obtain extruded solid product where particle size of graphene and metal cationic salt powder is 10-100 nm and extruding at 300-600 degrees C under protection of inert gas with pressure of 20-50 MPa to obtain graphene and metal oxide powder system with light energy conducting and converting functions.