▎ 摘　　要

NOVELTY - Graphene comprising a hole, is claimed, where an area of the graphene satisfies formula-1 and formula-2 of the specification. USE - The graphene is useful: for coating an electrode and an active material which are useful in a power storage device, and in an electric appliance which is a display device, a lighting device, a desktop personal computer, a laptop personal computer, an image reproduction device which reproduces a still image or a moving image stored in a recording medium i.e. a DVD, a mobile phone, a portable game machine, a portable information terminal, an e-book reader, a video camera, a digital still camera, a microwave, an electric rice cooker, an electric washing machine, an air-conditioning system, an electric refrigerator, an electric freezer, an electric refrigerator-freezer, a freezer for preserving DNA, a dialysis device, an electric vehicle, a hybrid vehicle which include both an internal combustion engine and a motor, or a motorized bicycle including motor-assisted bicycle (all claimed); and as a material of a lithium ion secondary battery. ADVANTAGE - The graphene: suppresses the reaction of the electrode or active material with an electrolyte without interference with the movement of lithium ions; has excellent permeability to lithium and excellent conductivity; provides a highly reliable electric appliance which can withstand long-term or repeated use; improves the charge and discharge rate and the cycle characteristics of the power storage device; and increases a storage capacity per unit weight of the power storage device.