▎ 摘　　要

NOVELTY - Method for producing a graphene nanosheet involves manufacturing an electrode assembly comprising a negative electrode comprising artificial graphite, a lithium metal counter electrode facing the negative electrode, and a separator interposed between the negative electrode and the lithium metal counter electrode and immersing the electrode assembly in an electrolyte, electrochemically charging the immersed electrode assembly, separating artificial graphite from the charged electrode assembly, and exfoliating the graphene nanosheets from the separated artificial graphite, where the initial discharge capacity of the negative electrode is greater than or equal to 350 mAh/g, and the electrolyte comprises lithium salt and an organic solvent comprising a cyclic carbonate and a linear carbonate. USE - The method is useful for producing a graphene nanosheet. ADVANTAGE - The method provides graphene nanosheet having excellent quality and easily peeled off from artificial graphite even under low pressure and temperature conditions.