Enhanced electrochemical performance of MoS(2)/graphene nanosheet nanocomposites

Molybdenum disulfide (MoS(2)) is attractive as an anode material for next-generation batteries, because of its layered structure being favorable for the insertion/deinsertion of Li(+) ions, and its fairly high theoretical capacity. However, since the MoS(2) anode material has exhibited disadvantages, such as low electrical conductivity and poor cycling stability, to improve the electrochemical performance of MoS(2) in this study, a nanocomposite structure consisting of MoS(2) and GNS (MoS(2)/GNS) as an anode for LIBs was prepared, by controlling the weight ratios of MoS(2)/GNS. The X-ray diffraction patterns and electron microscopic analysis showed that the nanocomposite electrode structure consisted of well-formed MoS(2) nanoparticles and GNS. Compared to MoS(2)-only, the MoS(2)/GNS composites exhibited high retention and improved capacity at high current densities. In particular, among these nanocomposite samples, MoS(2)/GNS(8 : 2) with an appropriate portion of GNS exhibited the best LIB performance, due to the lowest interfacial resistance and highest Li-ion diffusivity.