▎ 摘　　要

NOVELTY - Preparing high thermal conductivity graphene doped composite sheet comprises e.g. (i) mixing natural graphite with acid solution, stirring, adding catalyst and expandable intercalation agent, washing, and drying, (ii) placing the metal powder and the graphene powder in a ball mill tank, adding anhydrous ethanol, ball milling, vacuum-rotating the ball-milled mixture by using rotary dryer to obtain mixed powder, and (iii) placing the mixed powder in a graphite grinding tool, and sintering in a vacuum hot-press sintering furnace to obtain graphene-doped metal composite sheet. USE - The method is useful for preparing high thermal conductivity graphene doped composite sheet. ADVANTAGE - The method: is simple, has excellent thermal conductivity and enhances the thermal conductivity. DETAILED DESCRIPTION - Preparing high thermal conductivity graphene doped composite sheet comprises (i) mixing natural graphite with acid solution, stirring at room temperature for 5 minutes, adding catalyst and expandable intercalation agent, continuously stirring for 5-10 minutes, allowing to stand at room temperature 5 minutes to 1 hour to obtain graphene precursor, washing the graphene precursor by water for many times, placing in ultrasonic wave in ultrasonic stripping for 5 minutes to 1 hours to obtain graphene dispersion, centrifugally processing the graphene oxide dispersion liquid to obtain primary graphene, washing the graphene primary by water for many times, performing in-situ freezing and drying out water to obtain graphene powder, (ii) placing the metal powder and the graphene powder obtained in the step (i) in a ball mill tank, adding anhydrous ethanol, and ball milling for 4-6 hours, vacuum-rotating the ball-milled mixture by using rotary dryer to obtain mixed powder, and (iii) placing the mixed powder obtained in the step (ii) in a graphite grinding tool, and sintering in a vacuum hot-press sintering furnace to obtain graphene-doped metal composite sheet.