期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 50, 页码 55971-55981出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17058
关键词
in situ TEM; carbon nanotubule wet electrochemical cell; polysidfides; Li-S batteries; ionic liquid
资金
- National Key Research and Development Program of China [2018YFB0104300]
- National Natural Science Foundation of China [21935009, 51772262, 21406191, 11575154, 51971245, 51802277, 52022088]
- Fok Ying-Tong Education Foundation of China [171064]
- Natural Science Foundation of Hebei Province [B2018203297, B2020203037]
- Hebei One Hundred Talent Program [4570028]
- Beijing Natural Science Foundation [2202046]
- Beijing Natural Science Foundation of China-Haidian Special Project [L182065]
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University [20192103]
- State Key Laboratory of Molecular Engineering of Polymers, Fudan University [K2019-23]
- High-Level Talents Research Program of the Yanshan University [00500021502, 005000201]
- Hunan Innovation Team [2018RS3091]
Understanding polysulfide electrochemistry is critical for mitigation of the polysulfide shuttle effect in Li-S batteries. However, in situ imaging polysulfides evolution in Li-S batteries has not been possible. Herein, we constructed a hollow carbon nanotubule (CNT) wet electrochemical cell that permits real-time imaging of polysulfide evolutions in Li-S batteries in a Cs-corrected environmental transmission electron microscope. Upon discharge, sulfur was electrochemically reduced to long-chain polysulfides, which dissolved into the electrolyte instantly and were stabilized by Py-14(+) cations solvation. Metastable polysulfides prove to be problematic for Li-S batteries, therefore, destabilizing the Py-14(+)-solvated polysulfides by adding low polarized solvents into the electrolyte to weaken the interaction between Py-14(+) cation and long-chain polysulfides renders a rapid polysulfides-to-Li2S transition, thus efficiently mitigating polysulfide formation and improving the performance of Li-S batteries dramatically. Moreover, the CNT wet electrochemical cell proves to be a universal platform for in situ probing electrochemistry of various batteries.
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