▎ 摘　　要

NOVELTY - Preparation of graphene material, involves (s1) preparing graphite oxide by Hummers method, (s2) adding 2 mg graphite oxide powder to a beaker, adding 40 ml deionized water, ultrasonically dispersing for 15 minutes, adding cetyltrimethylammonium bromide, ammonium persulfate, and pyrrole, stirring at 0℃ for 24 hours, drying, adding the dried material to 30 ml potassium hydroxide solution, stirring for 24 hours, filtering, drying, heating to 800℃ under nitrogen protection, calcining at constant temperature for 2 hours to obtain nitrogen-doped graphene, and (s3) adding 2.91 g perylene tetracarboxylic dianhydride and 1.47 g 4,4'-diaminodiphenylmethane to three-necked flask, adding 50 ml N-methylpyrrolidone as reaction solvent, adding 0.04 g isoquinoline as catalyst and 5-10 g nitrogen-doped graphene, and refluxing and reacting at 203℃ under nitrogen protection for 4 hours, to synthesize polyimide and load it on graphene. USE - Preparation of graphene material used as positive electrode material (all claimed) in lithium-ion battery used in digital products, such as mobile phone and notebook computer. ADVANTAGE - The graphene material has excellent performance, high lithium storage capacity and capacity retention rate.