▎ 摘　　要

NOVELTY - Producing graphene comprises heat treating waste cathode material, separating graphite from the heat-treated waste cathode material, subjecting the separated graphite to a second heat treatment, and synthesizing graphene from the heat-treated graphite. USE - The graphene is useful in engineering fields. ADVANTAGE - The graphene has tap density of 0.1-1.0 g/cc, specific surface area (B.E.T) of 10-800 m/g, and thickness of 0.3-100 nm; is structurally and chemically stable. The method: reduces cost; improves productivity; is simple and environmentally friendly; and achieves recycling.