Effects of graphene on MoO2-MoS2 composite as anode material for lithium-ion batteries

The electrochemical properties of MoO2-MoS2/graphene electrode were compared with those of MoO2-MoS2, bulk MoS2, and graphene electrode. MoO2-MoS2 composite was prepared by a hydrothermal reaction of molybdenum (VI) oxide with sodium sulfide. MoO2-MoS2/graphene composite was obtained by the mechanical mixing of prepared MoO2-MoS2 composite with graphene. MoO2-MoS2/graphene and graphene electrodes exhibited good cycling stability, while MoO2-MoS2 and bulk MoS2 electrodes showed a decrease of capacity during cycling. Especially, the MoO2-MoS2/graphene composite anode showed a high discharge capacity (974 mAh/g) after 20th cycle and superior high-rate capability. Such excellent reversible capability and cycle performance may be attributed to the good combination of MoO2, MoS2, and graphene.