▎ 摘　　要

NOVELTY - Preparation of monolayer graphene comprises selecting high pressure reaction vessel as solvothermal reaction vessel, preparing lithium hexafluorophosphate electrolyte/graphite precursor solution as solvothermal reaction precursor, transferring to high pressure reactor, transferring high-pressure reactor containing lithium hexafluorophosphate electrolyte/graphite precursor solution into blast drying oven, performing solvothermal reaction, cooling, adding n-hexane, centrifuging mixture to obtain lithium-embedded single-layer graphene and carrying out centrifugal separation cleaning process. USE - Method for preparing monolayer graphene. ADVANTAGE - The product has high purity, high specific surface area, good conductivity, structural stability and electrochemical cyclic performance and great application for lithium secondary battery negative electrode material field. The method is simple and low-cost.