Sulfur/carbon binding with polar MoS3 as cathode materials for lithium-sulfur batteries

MoS3 is in situ grown on sulfur carbon composite (S/C-MoS3) surface by chemical oxidative reaction of (NH4)2MoS4. Based on the synergistic role of porous carbon and polar MoS3 with sulfur-like characteristic, polysulfides are effectively anchored and shuttle effect is greatly reduced. In particular, 10 wt% MoS3 bridged S/C composite exhibits the best electrochemical performance. After 100 cycles at 0.2C, the discharge specific capacity remains 727.6 mA h g−1, and the capacity retention rate is 59.0%. When cycling 300 times at 1C, the capacity is still maintained at 546.9 mA h g−1, and the coulomb efficiency is around 97.0%. The results show that MoS3 effectively improves the cyclic property of S/C composite for lithium‑sulfur battery.