Dual-function hollow MoS2 nanocages decorated on graphene sheets as efficient sulfur hosts for advanced Lithium-sulfur batteries

Due to the presence of polysulfide shuttling, serious electrode expansion, and the low electrical conductivity of sulfur materials at room temperature, the commercialization of Li-S batteries is still not feasible. In this study, we have synthesized unique hollow molybdenum disulfide nanocages/reduced graphene oxide (H-MoS 2 /rGO) composites to be employed as highly effective cathodes for Li-S batteries. In this well-designed structure, the hollow MoS 2 nanocages are tightly bound by C-O-Mo bonds and uniformly distributed across the graphene sheets. The dual-function MoS 2 nanocages can adsorb polysulfides by Mo-S bond and accelerate the conversion reaction of S 8 and Li 2 S. Moreover, the 3D rGO network with abundant pores effectively reduces the diffusion path and enhances the rapid transport of electrons and ions. The hybrid H-MoS 2 /rGO cathodes with these advantages exhibit a remarkable initial discharge capacity of 801.7 mAh g -1 at 1   C, as well as a high specific discharge capacity of 533.2 mAh g -1 is remained over 500 cycles.