▎ 摘　　要

NOVELTY - A method for preparing graphene includes providing a first electrode which is a graphite material and a second electrode in an electrolyte solution; intercalating the graphite material with the first bias voltage, then exfoliating the intercalated graphite material with the second voltage; and obtaining the solid portion from the electrolyte solution. The present invention provides a low-cost, simple and convenient and fast method to produce the graphene flakes.