期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 49, 页码 25973-25980出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202111360
关键词
hydrofluoroether; ionic liquids; Li deposition behavior; Li-O-2 batteries; Sand formula
资金
- National Key R&D Program of China [2017YFA0206700]
- National Natural Science Foundation of China [21835004, 22020102002]
- 111 Project from the Ministry of Education of China [B12015]
- Frontiers Science Center for New Organic Matter of Nankai University [63181206]
The Li+ transport ability of TFSI-IL electrolyte was greatly enhanced by introducing hydrofluoroether and optimizing electrolyte component ratios, resulting in robust Li deposition and significantly improved cycling stability of Li-O-2 batteries.
Bis(trifluoromethanesulfonyl)imide-based ionic liquid (TFSI-IL) electrolyte could endow Li-O-2 batteries with low charging overpotential. However, their weak Li+ transport ability (LTA) leads to non-uniform Li deposition. Herein, guided by Sand formula, the LTA of TFSI-IL electrolyte is greatly enhanced to realize robust Li deposition through introducing hydrofluoroether (HFE) and optimizing electrolyte component ratios to regulate solvation environment. The solvation environment changes from Li(TFSI)(2)(-) ion pair into ionic aggregate clusters in the optimal electrolyte thanks to the slicing function of HFE toward ionic aggregate network. The transport parameters of Sand formula are synchronously enhanced, resulting in highly robust Li deposition behavior with greatly improved Coulombic efficiency (ca. 97.5 %) and cycling rate (1 mA cm(-2)). Cycling stability of Li-O-2 batteries was greatly improved (a tiny overpotential rise of 64 mV after 75 cycles).
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