▎ 摘　　要

NOVELTY - Preparation of graphene involves preparing graphene oxide by dispersing graphite in deionized water, filtering and ultrasonically-drying filter material, placing graphene oxide under inert gas atmosphere, raising temperature to 700-900 degrees C, cooling to room temperature, placing under inert plasma with power of 50-150 W and reacting for 2-3 hours. USE - Preparation of graphene used for lithium-ion battery (claimed). ADVANTAGE - The graphene is prepared by simple method with high productivity. The battery containing the graphene has high energy storage capacity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for lithium-ion battery, which has sequentially laminated electrodes, diaphragm, graphene electrode sheet, electric core, sealed shell and electrolyte. The graphene electrode sheet includes current collector and slurry containing graphite, mixture of styrene-butadiene rubber and carboxymethyl cellulose, and conductive agent acetylene black in mass ratio of 85:5:10.