Enhanced electrochemical performance of MoS2/graphene nanosheet nanocomposites

Abstract

Molybdenum disulfide (MoS₂) 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 MoS₂ anode material has exhibited disadvantages, such as low electrical conductivity and poor cycling stability, to improve the electrochemical performance of MoS₂ in this study, a nanocomposite structure consisting of MoS₂ and GNS (MoS₂/GNS) as an anode for LIBs was prepared, by controlling the weight ratios of MoS₂/GNS. The X-ray diffraction patterns and electron microscopic analysis showed that the nanocomposite electrode structure consisted of well-formed MoS₂ nanoparticles and GNS. Compared to MoS₂-only, the MoS₂/GNS composites exhibited high retention and improved capacity at high current densities. In particular, among these nanocomposite samples, MoS₂/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.