▎ 摘　　要

NOVELTY - Preparing graphene involves mixing the expanded graphite and the polycyclic aromatic carboxylic acid, adding it to the solvent, and stirring to form a mixed solution. The obtained mixed liquid is subjected to exfoliation treatment until the expanded graphite is sufficiently exfoliated to obtain a mixed liquid containing graphene. The mixed solution containing graphene is dried, and removed the solvent to obtain coarse graphene powder containing polycyclic aromatic carboxylic acid. The obtained coarse graphene powder is heated in a protective atmosphere until the polycyclic aromatic carboxylic acid on the surface of the graphene coarse powder undergoes decarboxylation and polymerization to form graphene fragments. The coarse powder is reorganized and repaired, and finally graphene powder is obtained. USE - Method for preparing graphene. ADVANTAGE - The method has considerable yield, low requirements for preparation conditions, simple process, no dispersant adhesion on the surface of the prepared graphene product, and high quality.