▎ 摘　　要

NOVELTY - Manufacturing graphene, by adding graphite powder and water to reactor, sealing the reactor, stirring, heating the reactor to reaction temperature, performing constant stirring process continuously, cooling reaction mixture, taking out mixed reacted solution from the reactor, subjecting solution to centrifugal separation to obtain pellet at lower portion and liquid supernatant at upper portion, and subjecting obtained graphene dispersion to high speed centrifugal separation to obtain solid graphene. USE - The method is useful for manufacturing solid graphene (claimed). ADVANTAGE - The method utilizes water as solvent to overcome high boiling point, toxicity, difficulty associated with its removal and solubility of organic solvents, which does not satisfies solubility parameters of the graphene dispersion and leads to relatively lower or insufficient concentration of the graphene. The method provides high yield of the graphene with fewer defects, low oxygen content and maintained original electrical properties of the graphite. DETAILED DESCRIPTION - Method for manufacturing graphene, involves (a) adding graphite powder and water to reactor, (b) sealing the reactor, stirring, heating the reactor to reaction temperature and performing constant stirring process continuously after completion of the reaction, (c) cooling reaction mixture, taking out mixed reacted solution from the reactor, subjecting the solution to centrifugal separation to obtain pellet at lower portion and liquid supernatant at upper portion, where solid substances present at the lower portions are un-reacted solid graphite powder and the liquid supernatant is graphene dispersion, and (d) subjecting the graphene dispersion to high speed centrifugal separation to obtain solid graphene.