▎ 摘　　要

NOVELTY - Preparation of trimanganese tetroxide modified binary/graphene composite material comprises oxidizing graphite powder; dissolving graphite oxide in pure water, stirring, and ultrasonically dispersing to obtain solution-A; dissolving manganese salt and polyethylene pyrrolidone in pure water, and uniformly mixing to obtain solution-B; mixing solution-A and solution-B, and stirring; mixing with ammonia water, and stirring; adding sodium borohydride, stirring, reacting, and naturally cooling; suction filtering, water washing, alcohol washing, and drying. USE - Method for preparing trimanganese tetroxide modified binary/graphene composite material (claimed) used for lithium ion cell. ADVANTAGE - The material has excellent electrochemical circulation and excellent charge-discharge capacity performance. DETAILED DESCRIPTION - Preparation of trimanganese tetroxide modified binary/graphene composite material comprises oxidizing graphite powder by Hummers method; dissolving graphite oxide in pure water into a concentration of 1-2 g/L, stirring for 10-20 minutes, and ultrasonically dispersing for 1.5-3 hours to obtain solution-A; dissolving 0.2 mol/L manganese salt and 20 g/L polyethylene pyrrolidone in pure water, and uniformly mixing to obtain solution-B; mixing solution-A and solution-B at volume ratio of 3:1, and stirring for 2-3 hours to obtain solution-C; mixing solution-C and ammonia water at a volume ratio of 50:1, and stirring for 1 hour to obtain solution-D; taking 0.4-0.5 g/L solution-D, adding sodium borohydride, stirring for 10-15 minutes, reacting at 120-180 degrees C for 8-12 hours, and naturally cooling to room temperature; suction filtering, water washing, alcohol washing, and drying at 80 degrees C for 4 hours.