▎ 摘　　要

NOVELTY - A graphene material is prepared by taking graphite electrode as negative and positive electrodes, using electrolytic solution containing 1-butyl-3-methylimidazolium dibutyl phosphate, N-methylpyrrolidone hydrosulfate, ammonium dihydrogen phosphate and 1-methylimidazole hydrogen sulfate, adding expanded graphite at ratio of 100:1-30, grinding for 3 hours, treating with mixed solution of acetone and dimethyl formamide, centrifuging at 13000 revolutions/minute, and carrying out sedimentation. USE - Method for preparing graphene material (claimed). ADVANTAGE - The method has simple and mild process conditions with high quality graphene product.