▎ 摘　　要

NOVELTY - Preparation of graphene material comprises dispersing 99.5% purity flake graphite in solvent, stripping fully oxidized graphite, and preparing graphene oxide aqueous solution; under basic conditions, reducing graphene hydrosol graphene dispersed aqueous sol and stable black liquid; and under 1-20 Pa, freezing graphene aqueous sol to - 5 degrees C to - 20 degrees C for 1 hour, lyophilizing at 0 degrees C for 12-24 hours, freeze-drying under protection of inert gas at 300-800 degrees C, calcining for 0.5-3 hours, and cooling to room temperature. USE - Method of preparing graphene material (claimed). ADVANTAGE - The method is simple and low cost, environment-friendly and suitable for industrial production, and has high yield.