Synthesis of Few-Layer MoS2-Graphene Composites with Superior Electrochemical Lithium-Storage Performance by an Ionic-Liquid-Mediated Hydrothermal Route

Few-layer MoS2-graphene (FL-MoS2/G) composites are successfully fabricated by using a facile hydrothermal approach with the assistance of a small amount of ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM]BF4). The effects of the ionic liquid on the microstructure and electrochemical performance of the FL-MoS2/G composites are investigated. It is found that the composites have quasi-3D architectures composed of the interconnected graphene, on which the few-layer MoS2 sheets with more edges and defects are anchored. Electrochemical tests demonstrate that the FL-MoS2/G delivers a high reversible capacity of approximately 1200mAhg(-1) with excellent cycle performance and enhanced high-rate capability. The remarkable electrochemical performance can be attributed to novel features such as the robust quasi-3D heterostructural architecture and the synergetic interaction between FL-MoS2 sheets and graphene.