▎ 摘　　要

NOVELTY - Preparing high-quality graphene powder comprises (1) adding expanded graphite to an aqueous solution containing a hydrophilic polymer and an alkaline reagent, mixing, and then grinding to obtain a graphite slurry, (2) ultrasonically treating the obtained graphite slurry, allowing to stand for a period of time, and selecting the upper graphene dispersion solution, (3) adding a precipitant to the obtained graphene dispersion solution, and then filtering to obtain a graphene cake, and (4) washing, drying the obtained graphene cake, placing in a protective atmosphere and roasting at 350-800 degrees C to obtain high-quality graphene powder. USE - The method is useful for preparing high-quality graphene powder. ADVANTAGE - The method: is green; and has large-scale production, and ultra-low production cost.