期刊
ADVANCED MATERIALS INTERFACES
卷 9, 期 6, 页码 -出版社
WILEY
DOI: 10.1002/admi.202101699
关键词
dynamic catalytic mechanism; electrochemical analysis; Li-S batteries; metal sulfide; VS; (2)
资金
- National Natural Science Foundation of China [51702103, 22179096]
- Natural Science Foundation of Tianjin [19JCQNJC05600]
- Special Support Plan for High-Level Talents of Guangdong Province [2017TQ04N840]
- Opening Project of Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory [ZHD201901]
- Post-graduate and Doctoral Innovation Project of Tianjin [2019YJSS111, 2019YJSS132]
A dynamic catalytic mechanism is proposed in this study by using a Li+-interaction-reversible VS2 catalyst to address the issue of unclear chemical state changes and induced influence in the Li-S catalytic mechanism. Li-S batteries prepared with the VS2 catalyst exhibit excellent cyclability and rate capability.
Various catalysts are adopted to boost the conversion chemistry of Lithium sulfur (Li-S) batteries, but most of them are electrochemical-active in a working Li-S cell, and the changes of their chemical state and the induced influence toward the Li-S catalytic mechanism are unclear. Herein, a dynamic catalytic mechanism is proposed by the selection of Li+-interaction-reversible VS2 catalyst as a representative species to address this issue. The VS2 catalyst with ultrastable Li+ intercalation/deintercalation characteristics, fast charge transport capability, and active capacity contribution can provide a strong and dynamic chemisorption toward polysulfide (LiPS). The resulting Li-S batteries exhibit excellent cyclability at 3 C with capacity attenuation of 81.23% over 250 cycles and good rate capability up to 8 C. Moreover, a new insight toward the dynamic catalytic changes induced by the prominent Li+ intercalation process of metal sulfide is proposed, which can provide more opportunities for the evolutional design for Li-S catalysts.
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