▎ 摘　　要

NOVELTY - A fluffy extension layer is treated by pretreating and cryogenic freezing treating graphite dispersion slurry to form graphite sheet layer, and processing adjacent two graphite sheet layers. The frozen fluffy extension layer is high-energy microwave heated, to obtain flocculant graphene samples and residual flakes of graphite. The residual flakes of graphite are converted to flocculant graphene. Flocculant graphene and acetone are mixed and ultrasonically processed, to obtain graphene dispersant. The graphene dispersant is dried, to obtain high-surface-area graphene. USE - Preparation of graphene used for energy storage material, electronic component, conductive device, thermally conductive device, chemical fibers and mechanical component (all claimed). ADVANTAGE - The method enables preparation of graphene with high reaction rate, short reduction reaction time, uniform size distribution and excellent electrical characteristics. DETAILED DESCRIPTION - A graphite dispersion slurry is pretreated by adding high-carbon crystalline flake graphite powder and deionized water to reactor, evenly mixing mixture and ultrasonically processing mixture in low-temperature ice bath. A fluffy extension layer is treated by pretreating and cryogenic freezing treating graphite dispersion slurry to form graphite sheet layer, and processing adjacent two graphite sheet layers. The frozen fluffy extension layer is placed in negative-pressure environment and high-energy microwave heated, to obtain flocculant graphene samples and residual flakes of graphite. The residual flakes of graphite are converted to flocculant graphene. Flocculant graphene and acetone are added to reactor, mixed and ultrasonically processed in low-temperature conditions for 4-6 hours, to obtain high-surface-area graphene dispersant. The high-surface-area graphene dispersant is dried at 60 degrees C under negative pressure, to obtain high-surface-area graphene.