▎ 摘　　要

NOVELTY - Improving graphene defect comprises introducing and soaking the mixed fluid with reaction compound and supercritical fluid in the graphene powder in the reaction tank containing graphene powder and conforming to a supercritical fluid environment, where the reaction compound comprises a compound of carbon, hydrogen, nitrogen, silicon or oxygen element to passivate and repair the graphene structure defects of the graphene powder, separating the mixed fluid from the graphene powder, and adsorbing the graphene powder remaining in the mixed fluid with a molecular sieve. USE - The method is useful for improving graphene defect. ADVANTAGE - The method: reduce ratio of structural defects of grapheme, and number of graphene layers; increases composition content of grapheme; and provides graphene powder with good thermal and electrical conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene powder, comprising nitrogen-hydrogen, carbon-hydrogen, carbon-oxygen, carbon-nitrogen and/or carbon- silicon, where the number of layers of the graphene is 20 layers or less, the 2D/G value of the graphene powder is 0.3-0.6, the G/D value of the graphene powder is 2-4, the 2D/G value and the G/D value are Raman shift 1351 wavenumber (D band) and Raman shift 1587 wave number (G band) analyzed by Raman spectroscopy, and Raman shift 2687 wavenumber (2D band) intensity ratio obtained.