▎ 摘　　要

NOVELTY - An ultrathin graphene nanosheet electrochemical preparation method comprises taking layered graphite electrode as anode, metal or graphite electrode as cathode, and acid-containing liquid phase system as electrolyte and intercalation source, carrying out electrochemical intercalation process at current density of 20-600 A/m2 for 2-5 hours, carrying out thermal heat stripping at 300-800 degrees C for 10 seconds to 2 minutes, forming stripped graphite sheet and little nano graphene sheet, peeling off graphene nano sheet, obtaining stripped graphite and nano graphene sheet, taking it as anode material, and repeating electrochemical intercalation process. USE - Ultrathin graphene nanosheet electrochemical preparation method for supercapacitor electrode material (claimed). ADVANTAGE - The method is simple, energy efficient, short and suitable for industrialization.