Synthesis of MoS2 and Graphene Composites as the Anode Materials for Li-Ion Batteries

The MoS2 and N-doped graphene (MoS2/NG) composites are fabricated by an ethylenediamine-assisted hydrothermal method for the anode materials of lithium-ion batteries. The effects of hydrothermal systems with different amount ethylenediamine on the morphology of the MoS2 in the prepared composites are investigated. The microstructure and morphology of the as-obtained composites are characterized by SEM, TEM and XRD methods. The analytical result reveals that the ultrathin few-layered MoS2 nanosheets are tightly anchored on the graphene in the MoS2/NG composites. Given the different nanostructures of the as-obtained composites, the possible formation mechanism is discussed and the electrochemical properties are studied. The MoS2/NG composites prepared with optimized amount of ethylenediamine modifier exhibit improved electrochemical performances, i. e. the enhanced cycling stability with reversible capacity of 816.6 mA h g(-1) at 200 mA g(-1) after 120 cycles and remarkable high-rate capacity of 683.8 mA h g(-1) at 2000 mA g(-1). Therefore, the MoS2/graphene composites have great potential being an electrode material for lithium-ion batteries (LIBs).