Ni Single Atoms on MoS₂ Nanosheets Enabling Enhanced Kinetics of Li‐S Batteries

Abstract

Abstract The practical application of Li‐S batteries is seriously hindered due to its shuttle effect and sluggish redox reaction, which requires a better functional separator to solve the problems. Herein, polypropylene separators modified by MoS 2 nanosheets with atomically dispersed nickel (Ni‐MoS 2 ) are prepared to prevent the shuttle effect and facilitate the redox kinetics for Li‐S batteries. Compared with pristine MoS 2 nanosheets, Ni‐MoS 2 nanosheets exhibit both excellent adsorption and catalysis performance for overcoming the shuttle effect. Assembled with this novel separator, the Li‐S batteries exhibit an admirable cycling stability at 2 C over 400 cycles with 0.01% per cycle decaying. In addition, even with a high sulfur loading of 7.5 mg cm −2 , the battery still provides an initial capacity of 6.9 mAh cm −2 and remains 5.9 mAh cm −2 after 50 cycles because of the fast convention of polysulfides catalyzed by Ni‐MoS 2 nanosheets, which is further confirmed by the density functional theory (DFT) calculations. Therefore, the proposed strategy is expected to offer a new thought for single atom catalyst applying in Li‐S batteries.