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Solvation Rule for Solid‐Electrolyte Interphase Enabler in Lithium‐Metal Batteries
Author(s) -
Su ChiCheung,
He Meinan,
Shi Jiayan,
Amine Rachid,
Zhang Jian,
Amine Khalil
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202008081
Subject(s) - solvation , electrolyte , anode , lithium (medication) , electrochemistry , interphase , chemistry , inorganic chemistry , metal , battery (electricity) , chemical engineering , materials science , solvent , electrode , organic chemistry , thermodynamics , biology , medicine , engineering , genetics , endocrinology , power (physics) , physics
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.