▎ 摘　　要

NOVELTY - Preparing few-layer graphene comprises e.g. (i) dispersing graphite raw materials in a specified dispersant system, and placing them in an ultrasonic environment for many hours to obtain a graphite-graphene mixed dispersion liquid, (ii) dispensing graphite-graphene mixed dispersion is into centrifuge tube and centrifuging at high speed to obtain a black upper dispersion and a black lower precipitated solid, the upper dispersion is the finished graphene product, while the lower precipitated solid is the semi-finished graphene that has not been completely peeling off, when the sonication time is insufficient, the precipitating solid may also contains some graphite impurities, (iii) transfering finished graphene dispersion to other vessels for storing, and using stable one/two-component solution with suitable surface energy properties to collecting semi-finished graphene in each centrifuge tube into the reaction vessel, spontaneous re-peeling of semi-finished graphene can occur. USE - The method is useful for preparing few-layer graphene. ADVANTAGE - The method: improves unit yield of graphene, has low pollution rate, low cost, high product purity, low hole defect rate, and low impurity content. DETAILED DESCRIPTION - Preparing few-layer graphene comprises (i) dispersing graphite raw materials in a specified dispersant system, and placing them in an ultrasonic environment for many hours to obtain a graphite-graphene mixed dispersion liquid, (ii) dispensing graphite-graphene mixed dispersion is into centrifuge tube and centrifuging at high speed to obtain a black upper dispersion and a black lower precipitated solid, the upper dispersion is the finished graphene product, while the lower precipitated solid is the semi-finished graphene that has not been completely peeling off, when the sonication time is insufficient, the precipitating solid may also contains some graphite impurities, (iii) transfering finished graphene dispersion to other vessels for storing, and using stable one/two-component solution with suitable surface energy properties to collecting semi-finished graphene in each centrifuge tube into the reaction vessel, spontaneous re-peeling of semi-finished graphene can occur by injecting a stable one/two-component solution with suitable surface energy properties as release agent, at this time, continuously updating phase interface by continuous gas blowing, chemical gas production, and manual liquid exchange, etc., which can amplifying process, and (iv) collecting re-exfoliated graphene product on the surface phase interface, freezing at -20 degrees C, and freeze-drying in vacuum to remove release agent component to obtain re-exfoliated graphene powder, according to needs different graphene product forms can be obtained by film forming, tableting, and other methods.