▎ 摘　　要

NOVELTY - The preparation method of graphene involves screening graphite raw materials to obtain graphite raw material, cracking the graphite raw material, adding release agent to the graphite raw material, intercalating the solvent molecules of the release agent into layers of graphite to obtain graphite-release agent mixed solution, inflating graphite-release agent mixed solution, detonating bubbles, weakening graphite interlayer adhesion force, and weakening adhesion between thin layer of graphite and release agent, graphite to obtain mixture of graphite, graphene and release agent. USE - Preparation method of graphene (claimed). ADVANTAGE - The method enables preparation of graphene with high efficiency and high purity, by simple and environmentally-friendly process. DETAILED DESCRIPTION - The preparation method of graphene involves (S1) screening graphite raw materials to obtain graphite raw material, (S2) cracking the graphite raw material under protective gas atmosphere, (S3) adding release agent to the graphite raw material, completely stirring for 30 minutes to 1 hour, intercalating the solvent molecules of the release agent into the layers of graphite to obtain graphite-release agent mixed solution, where the release agent is a surfactant, and the binding force is greater than the Van der Waals force of the graphite interlayer, (S4) inflating the graphite-release agent mixed solution using a bubble generating device so that the hydrophobic end of the release agent adhered to a thin layer of graphite is sufficiently filled with gas to produce air bubbles, (S5) detonating bubbles using an air explosion device, weakening the graphite interlayer adhesion force by bubble explosion impact force, and weakening the adhesion between thin layer of graphite and release agent, graphite to obtain mixture of graphite, graphene and release agent, (S6) centrifugal dehydrating the mixture of graphite, graphene and release agent, drying, sintering, and removing the release agent to obtain mixture of graphite and graphene, (S7) adding the mixture of graphite and graphene to a reactor, adding electrolyte to the reactor, completely immersing the mixture of graphite and graphene in the electrolyte, inserting two electrodes into the reactor, continuously electrolyzing with direct current voltage, performing electrochemical extraction, decomposing graphene from the mixture of graphite and graphene, and precipitating the graphite in the electrolyte to obtain upper layer of graphene electrolyte and lower layer of graphite precipitate, and (S8) separating the graphene electrolyte, and drying.