Premium
Rational Design of MXene/1T‐2H MoS 2 ‐C Nanohybrids for High‐Performance Lithium–Sulfur Batteries
Author(s) -
Zhang Yelong,
Mu Zijie,
Yang Chao,
Xu Zhikun,
Zhang Shan,
Zhang Xiaoyan,
Li Yingjie,
Lai Jianping,
Sun Zhonghui,
Yang Yong,
Chao Yuguang,
Li Chunji,
Ge Xiaoxiao,
Yang Wenxiu,
Guo Shaojun
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201707578
Subject(s) - polysulfide , materials science , cathode , sulfur , dissolution , redox , chemical engineering , lithium (medication) , nanotechnology , energy storage , electrode , chemistry , electrolyte , metallurgy , medicine , engineering , endocrinology , power (physics) , physics , quantum mechanics
Despite high‐energy density and low cost of the lithium–sulfur (Li–S) batteries, their commercial success is greatly impeded by their severe capacity decay during long‐term cycling caused by polysulfide shuttling. Herein, a new phase engineering strategy is demonstrated for making MXene/1T‐2H MoS 2 ‐C nanohybrids for boosting the performance of Li–S batteries in terms of capacity, rate ability, and stability. It is found that the plentiful positively charged S‐vacancy defects created on MXene/1T‐2H MoS 2 ‐C, proved by high‐resolution transmission electron microscopy and electron paramagnetic resonance, can serve as strong adsorption and activation sites for polar polysulfide intermediates, accelerate redox reactions, and prevent the dissolution of polysulfides. As a consequence, the novel MXene/1T‐2H MoS 2 ‐C‐S cathode delivers a high initial capacity of 1194.7 mAh g −1 at 0.1 C, a high level of capacity retention of 799.3 mAh g −1 after 300 cycles at 0.5 C, and reliable operation in soft‐package batteries. The present MXene/1T‐2H MoS 2 ‐C becomes among the best cathode materials for Li–S batteries.