CoS2-MoS2-CNT composite modified separator with enhanced LiPS adsorption capacity for lithium-sulfur battery

The three-dimensional mesh CoS2-MoS2-CNT composite material with abundant pores was prepared by two-step hydrothermal method as CoS2-MoS2-CNT functional separator and introduced into lithium-sulfur battery. XRD, XPS and SEM tests of CoS2-MoS2-CNT proved that the material was successfully prepared, and its morphology was a three-position porous structure composed of interwoven nanotubes and nanosheets. The results of Li2S6 adsorption experiment and visual penetration experiment show that CoS2-MoS2-CNT composite material has strong adsorption effect on LiPS, and can prevent LiPS from passing through the separator, which effectively inhibits the shuttle effect. CoS2-MoS2-CNT coating effectively plays the synergistic effect of each component to achieve effective fixation and transformation of LiPS, which solves the shortage of lithium-sulfur batteries. Cells with CoS2-MoS2-CNT functional separators have a high initial specific capacity (0.2C, 1411 mAh g−1), excellent rate performance and excellent cycle stability at large currents (0.13% attenuation per cycle at 2C).