▎ 摘　　要

In this study, Fe3O4/graphene nanosheets (Fe3O4/GNSs) nanocomposite was synthesized by using the combination of simple hydrothermal treatment and calcination. It was found Fe3O4 nanoparticles with diameter of 15 nm were synthesized and uniformly dispersed on the surface of graphene nanosheets (GNSs). When our cost-effective Fe3O4/GNSs was employed as an anode material in lithium-ion battery, it exhibited a high reversible capacity of 740 mA h/g after 100 cycles at a current density of 100 mA/g. This high performance is attributed to the following reasons: (i) the nanoparticles down to similar to 15 nm act not only as electrochemical active sites but as spacers, (ii) GNSs that carry the nanoparticles enhance electron transport by providing conductive pathways, and (iii) Fe3O4/GNSs creates a three-dimensional architecture that effectively facilitates ion diffusion and lithium-ion storage. This finding would open up an efficient route for synthesis and application of GNSs hybrids as anode materials for lithium-ion batteries of high performance.