期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 19, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115884
关键词
Electrolyte Chemistry; Electrolyte Engineering; Lithium-Metal Battery; Solvation Structure; Solvent Design
资金
- Swiss National Science Foundation (SNF) [200021-188572]
- National Research Foundation of Korea (NRF) [NRF- 2021R1A2B5B03001956]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE) of Korea [20012341]
- Institute of Engineering Research (IOER)
- Inter-university Semiconductor Research Center (ISRC)
- Research Institute of Advanced Materials (RIAM) at Seoul National University
- Universite de Fribourg
- Swiss National Science Foundation (SNF) [200021_188572] Funding Source: Swiss National Science Foundation (SNF)
This study reports the synthesis of a new high-voltage fluorinated ether solvent through integrated ring-chain molecular design, demonstrating its high-voltage stability and good ionic conductivity. It enables uniform Li-solvation even at low-salt concentration, resulting in outstanding cycling stability in the Li|NCM811 full cell.
Ether-based electrolytes offer promising features such as high lithium-ion solvation power and stable interface, yet their limited oxidation stability impedes application in high-voltage Li-metal batteries (LMBs). Whereas the fluorination of the ether backbone improves the oxidative stability, the resulting solvents lose their Li+-solvation ability. Therefore, the rational molecular design of solvents is essential to combine high redox stability with good ionic conductivity. Here, we report the synthesis of a new high-voltage fluorinated ether solvent through integrated ring-chain molecular design, which can be used as a single solvent while retaining high-voltage stability. The controlled Li+-solvation environment even at low-salt-concentration (1 M or 2 M) enables a uniform and compact Li anode and an outstanding cycling stability in the Li|NCM811 full cell (20 mu m Li foil, N/P ratio of 4). These results show the impact of molecular design of electrolytes towards the utilization of LMBs.
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