期刊
SMALL
卷 18, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202204005
关键词
catalysis; Co; lithium-sulfur batteries; MXenes; shuttle effect
类别
资金
- National Natural Science Foundation of China [51932005, 22072164]
- Liaoning Revitalization Talents Program [XLYC1807175]
- Research Fund of Shenyang National Laboratory for Materials Science
- Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, China [2021002]
- Science and Technology Research Project of Education Department of Jilin Province [JJKH20210453KJ]
This study reveals the catalytic process of Co/Ti2C for the conversion of LiPSs and identifies the optimization of chemical adsorption, catalytic activity, and lithium-ion transfer behaviors as the reasons for its outstanding performance, along with sufficient interfaces between the catalyst and electrolyte.
Catalysis is regarded as an effective strategy to fundamentally increase sulfur utilization, accelerating the kinetics of the transformation between lithium polysulfides (LiPSs) and lithium sulfide (Li2S) on a substrate. However, the intermodulation of catalysts and sulfur species is elusive, which is limited to the comprehensive analysis of electrochemical performance in the dynamic reaction process. Herein, cobalt nanoparticles loaded on MXene nanosheets (Co/Ti2C) are selected as sulfur hosts and the representative catalyst. By combining ex situ electrochemical results and interfacial structural chemical monitoring, the catalysis process of Co/Ti2C toward LiPSs conversion is revealed, and the outstanding performance originates from the optimization of chemical adsorption, catalytic activity, and lithium-ion transfer behaviors, which is based on electronic/ion modulation and sufficient interfaces among catalysts and electrolyte. This work can guide the construction of electronic modulation at triple-phase interface catalysis to overcome the shuttle effect and facilitate sulfur redox kinetics in Li-S batteries.
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