▎ 摘　　要

NOVELTY - Preparing graphene by intercalating alkali metal, comprises (i) mixing a graphite raw material and an alkali metal in inert environment to obtain a graphite-alkali metal mixed material, and allowing to stand the resultant in an inert environment for metal intercalation reaction of graphite until the composite material changes from black to golden yellow; and (ii) introducing the obtained composite material in liquid medium for reacting, removing the intercalation substance, shaking, washing and separating. USE - The graphene is useful for energy storage, catalysis and composite materials. ADVANTAGE - The method: improves productivity and purity of graphene and consumes low energy; and is environmentally-friendly and economical. The graphene has excellent material properties, flexibility, large specific surface area, a high Young's modulus, electron mobility, extremely high thermal conductivity, single layer of sp2 hybrid carbon atoms, and is thinnest and hardest nanocarbon material, completely transparent and light in weight. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene prepared by the above method.