Modulating d‐Band Electronic Structures of Molybdenum Disulfide via p/n Doping to Boost Polysulfide Conversion in Lithium‐Sulfur Batteries
Guo Liu, Qi Zeng, Xinyi Sui, Shuhao Tian, Xiao Sun, Qingfeng Wu, Xijuan Li, Yuhao Zhang, Kun Tao, Erqing Xie, Zhenxing Zhang
Abstract
Abstract Polysulfide shuttle effect and sluggish sulfur reaction kinetics severely impede the cycling stability and sulfur utilization of lithium‐sulfur (Li‐S) batteries. Modulating d‐band electronic structures of molybdenum disulfide electrocatalysts via p/n doping is promising to boost polysulfide conversion and suppress polysulfide migration in lithium‐sulfur batteries. Herein, p‐type V‐doped MoS 2 (V‐MoS 2 ) and n‐type Mn‐doped MoS 2 (Mn‐MoS 2 ) catalysts are well‐designed. Experimental results and theoretical analyses reveal that both of them significantly increase the binding energy of polysulfides on the catalysts’ surface and accelerate the sluggish conversion kinetics of sulfur species. Particularly, the p‐type V‐MoS 2 catalyst exhibits a more obvious bidirectional catalytic effect. Electronic structure analysis further demonstrates that the superior anchoring and electrocatalytic activities are originated from the upward shift of the d‐band center and the optimized electronic structure induced by duplex metal coupling. As a result, the Li‐S batteries with V‐MoS 2 modified separator exhibit a high initial capacity of 1607.2 mAh g −1 at 0.2 C and excellent rate and cycling performance. Moreover, even at a high sulfur loading of 6.84 mg cm −2 , a favorable initial areal capacity of 8.98 mAh cm −2 is achieved at 0.1 C. This work may bring widespread attention to atomic engineering in catalyst design for high‐performance Li‐S batteries.