Fe3O4 nanoparticles dispersed graphene nanosheets for high performance lithium-ion battery anode

This letter reports on the synthesis of Fe3O4@graphene composites (FGC) and their applications as anode materials in lithium-ion batteries (LIBs). As an anode material for LIBs, the FGC exhibited discharge and charge capacities of 1354 and 953 mAh g−1 in the initial cycle at 200 mA g−1, respectively. And more impressively, 639 mAh g−1 was remained after a twenty-five fold increase in current density to 5 A g−1. Especially, the capacity steadily maintained at 788 mAh g−1 even after 500 charge-discharge cycles at 1 A g−1. Such a high capacity and excellent cycling stability can be attributed to the strongly coupled interactions between graphene sheets and Fe3O4 NPs.