期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202204776
关键词
Fluorinated Electrolytes; Fluorinated Solid Electrolyte Interphase; Lithium-Metal Batteries; Molecular Design; Pouch Cells
资金
- National Key Research and Development Program [2021YFB2500300]
- National Natural Science Foundation of China [U1801257, 22109007, 22109086]
- China Postdoctoral Science Foundation [2021M700404, 2021TQ0161, 2021M691709]
- Scientific and Technological Key Project of Shanxi Province [20191102003]
- Seed Fund of Shanxi Research Institute for Clean Energy, Tsinghua University Initiative Scientific Research Program
- Beijing Institute of Technology Research Fund Program for Young Scholars
This study proposes design principles of fluorinated molecules for constructing fluorinated solid electrolyte interphase (SEI) to improve the stability of lithium (Li)-metal anodes. A novel activated fluoroalkyl molecule (AFA) is introduced to achieve fast and complete defluorination and generate uniform fluorinated SEI on Li-metal anodes. The fluorinated SEI constructed by AFA exhibits better performance in Li-sulfur (Li-S) batteries compared to the SEI formed by LiNO3.
The lifespan of practical lithium (Li)-metal batteries is severely hindered by the instability of Li-metal anodes. Fluorinated solid electrolyte interphase (SEI) emerges as a promising strategy to improve the stability of Li-metal anodes. The rational design of fluorinated molecules is pivotal to construct fluorinated SEI. Herein, design principles of fluorinated molecules are proposed. Fluoroalkyl (-CF2CF2-) is selected as an enriched F reservoir and the defluorination of the C-F bond is driven by leaving groups on beta-sites. An activated fluoroalkyl molecule (AFA), 2,2,3,3-tetrafluorobutane-1,4-diol dinitrate is unprecedentedly proposed to render fast and complete defluorination and generate uniform fluorinated SEI on Li-metal anodes. In Li-sulfur (Li-S) batteries under practical conditions, the fluorinated SEI constructed by AFA undergoes 183 cycles, which is three times the SEI formed by LiNO3. Furthermore, a Li-S pouch cell of 360 Wh kg(-1) delivers 25 cycles with AFA. This work demonstrates rational molecular design principles of fluorinated molecules to construct fluorinated SEI for practical Li-metal batteries.
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