MoWS2 promoted lithium polysulfide conversion for high-performance lithium‑sulfur battery

Lithium‑sulfur batteries are recognized as the most promising next generation lithium-ion batteries due to their high energy density and low cost. However, the shuttle effect of lithium polysulfide and sluggish electrochemical kinetic of the sulfur cathode have limited the further development of lithium‑sulfur batteries. Herein, we successfully prepared CNT-MoWS2-n composites as sulfur carrier materials by in situ compounding polar MoWS2 on carbon nanotubes. It was demonstrated that the moderate addition of MoWS2 could also significantly improve the specific capacity of lithium‑sulfur batteries, in which CNT-MoWS2–1/S showed the most excellent electrochemical performance. The first discharge capacity reached 1204.5 mAh/g at the current density of 0.1C, and the specific capacity was maintained 602 mAh/g after 200 cycles at the current density of 0.2C, which showed excellent electrochemical performance.