Solvothermal-assisted assembly of MoS2 nanocages on graphene sheets to enhance the electrochemical performance of lithium-ion battery

An ordered hollow MoS2 nanocages/RGO nanocomposite is constructed by a simple solvothermal-assisted assembly method combined with freeze-drying and annealing. In this novel nanostructure, hollow MoS2 nanocages are homogeneously distributed on graphene sheets with a tight bond of C-O-Mo. The nanosized and hollow MoS2 nanocages can effectively accommodate the huge volume change during charge/discharge process and increase the number of electrochemical reaction active sites, accelerating the kinetics of lithiation/delithiation. The tight C-O-Mo bond between graphene and MoS2 further reinforces the structural stability, thus improve the electrical conductivity and substantially enhance the lithium storage performance of MoS2 anode material. As a result, this novel nanocomposite shows a long-cycle stability of 717.4 mAhg(-1) after 800 cycles at a high current density of 3 Ag-1, exhibiting great potential as an anode nanocomposite for advanced lithiumion batteries.