▎ 摘　　要

NOVELTY - A graphene is obtained by preparing 0.02-2 wt.% graphene aqueous dispersion and leaving to stand, and measuring the absorbance of the same solvent dissolving solution at the same concentration of the same volume of the upper, middle and bottom graphene aqueous dispersion at the same temperature, after standing for 2 hours. The relative deviation of the absorbance of the dissolving solution of the upper, middle and bottom graphene aqueous dispersions is less than 5%, preferably less than or equal to 1%, after standing for 24 hours. The relative deviation of the absorbance of the dissolved solution of the upper, middle and bottom graphene aqueous dispersions is less than 10%, preferably less than or equal to 3%. USE - Graphene. ADVANTAGE - The graphene has excellent water dispersibility, which solves the problem of hydrophobicity of traditional graphene and the inherent hydrophobicity of carbon materials compared with other materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene, which involves (I) contacting graphite with an intercalating agent is chosen from at least one of hydrazine hydrate, carbon disulfide, elemental phosphorus and elemental sulfur to obtain graphite having increased interlayer distance, (II) contacting the obtained graphite with an oxidant is chosen from at least one of air, oxygen, ozone, chlorine dioxide, chlorine, hypochlorous acid, nitric acid, hydrogen peroxide, benzoyl peroxide and dicumyl peroxide, and (III) ultrasonically peeling the obtained product.