期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 41, 页码 18229-18233出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202008081
关键词
anode stabilization; electrolyte solvation; lithium-metal batteries; solid-electrolyte interphase; solvation numbers
资金
- U.S. Department of Energy (DOE), Vehicle Technologies Office (VTO)
- DOE Office of Science by UChicago Argonne, LLC under the U.S.-Germany Cooperation on Energy Storage [DE-AC02-06CH11357]
- DOE VTO within the core funding of the Applied Battery Research for Transportation Program
- National Science Foundation Major Research Instrumentation Program [CHE-1338173]
Despite the exceptionally high energy density of lithium metal anodes, the practical application of lithium-metal batteries (LMBs) is still impeded by the instability of the interphase between the lithium metal and the electrolyte. To formulate a functional electrolyte system that can stabilize the lithium-metal anode, the solvation behavior of the solvent molecules must be understood because the electrochemical properties of a solvent can be heavily influenced by its solvation status. We unambiguously demonstrated the solvation rule for the solid-electrolyte interphase (SEI) enabler in an electrolyte system. In this study, fluoroethylene carbonate was used as the SEI enabler due to its ability to form a robust SEI on the lithium metal surface, allowing relatively stable LMB cycling. The results revealed that the solvation number of fluoroethylene carbonate must be >= 1 to ensure the formation of a stable SEI in which the sacrificial reduction of the SEI enabler subsequently leads to the stable cycling of LMBs.
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