▎ 摘　　要

A facile and straightforward method has been developed to synthesize laminated-structured Fe3O4/graphene composite through solvothermal reaction. The particle size and coverage density of Fe3O4 on graphene sheets were controlled by adjusting the molar ratio of graphite oxide (GO) and Fe (II) ions. Spherical Fe3O4 nanoparticles were decorated densely and homogeneously on the graphene sheets. Galvanostatic charge-discharge cycling of the optimized Fe3O4/graphene composite exhibited a reversible specific capacity more than 963 mAh g(-1) after 100 cycles without detectable capacity fading at the current density of 100 mA g(-1). Even after 50 cycles at various rates from 100 to 2500 mA g(-1), it still maintained the specific capacity of 979 mAh g(-1) at 100 mA g(-1). The highly improved performance of Fe3O4/graphene composite could be attributed to the pinning effect of hydroxyl/epoxy groups on Fe atoms of Fe3O4 nanoparticles and the excellent interfacial interaction between Fe3O4 and graphene.