▎ 摘　　要

NOVELTY - Preparing graphene involves dispersing nickel nanospheres and oxidizing agent in anhydrous ethanol at 30-50 kiloHertz for 20-50 minutes to obtain suspension, where molar ratio of nanometer sphere: oxidizing agent: anhydrous ethanol is 1:0.4-40:100-500. Oxidized agent is selected from one or more of soluble divalent copper salt of potassium chlorate and sodium nitrate, then suspension is poured into polytetrafluoroethylene-lined autoclave and placed in 100-150 degrees C oven for 4-10 hours and natural cooled Stored to room temperature. USE - Method for preparing graphene (claimed). ADVANTAGE - The method enables to prepare graphene is easy to prepare, eco-friendly and obtained graphene has excellent quality and yield. DETAILED DESCRIPTION - Preparing graphene involves dispersing nickel nanospheres and oxidizing agent in anhydrous ethanol at 30-50 kiloHertz for 20-50 minutes to obtain suspension, where molar ratio of nanometer sphere: oxidizing agent: anhydrous ethanol is 1:0.4-40:100-500. Oxidized agent is selected from one or more of soluble divalent copper salt of potassium chlorate and sodium nitrate, then suspension is poured into polytetrafluoroethylene-lined autoclave and placed in 100-150 degrees C oven for 4-10 hours and natural cooled Stored to room temperature, then washed in vacuum at 50-90 degrees C, then nickel/ graphene powder is added with 0.4-0.6 mole/liter dilute acid in 30-50 KiloHertz ultrasonic shock for 20-50 minute ultrasonic dispersion at room temperature for 8-16 hours, then washed at 50-90 degrees C in vacuum, and dried to constant weight to produced graphene.