▎ 摘　　要

NOVELTY - Preparing graphene, comprises: (a) mixing crystalline flake graphite powder with ionic liquid at a room temperature; and (b) mechanically grinding the obtained crystalline flake graphite powder-ionic liquid mixture under an anaerobic condition to obtain mixture containing graphene, where the grinded mixture contains a little impurity. USE - The graphene is useful for preparing electrochemical working electrodes (claimed). ADVANTAGE - The method provides graphene with high efficiency in a simple, cost-effective and environment-friendly manner. DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a method for preparing graphene.