▎ 摘　　要

NOVELTY - Supercritical carbon dioxide-assisted liquid-phase exfoliation preparation of graphene comprises weighing graphite powder and organic solvent to prepare reaction solution with certain concentration, ultrasonically and uniformly mixing, adding reaction solution into reaction kettle, heating to 40-80 degrees C, starting stirring function, introducing carbon dioxide until pressure is 10-20 MPa, reacting for 2-6 hours, taking out, water bath cooling to below the critical point temperature of carbon dioxide, opening exhaust valve outlet of carbon dioxide, taking out solution, ultrasonically dispersing, centrifuging, and taking supernatant which is graphene solution. USE - The method is for supercritical carbon dioxide-assisted liquid-phase exfoliation preparation of graphene. ADVANTAGE - The method is green, environment-friendly and practical, and has simple operation, mild reaction condition, high product quality, low cost and little consumption of organic solvent.