▎ 摘　　要

NOVELTY - The preparation of graphene material, involves mixing substance (I) with cellulose, adding a catalyst, forming synthetic material under hydrothermal conditions, drying synthetic material to water content of 10% or less, carrying out gradient temperature carbonation in protective atmosphere to obtain carbonized material, and washing carbonized material. The substance (I) is starch and starch sugar. USE - Preparation of graphene material (claimed). ADVANTAGE - The method enables preparation of graphene material with stable performance, high surface area, and high dispersion performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for graphene material.