Water-in-salt widens the electrochemical stability window: Thermodynamic and kinetic factors |
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| Authors: | Tianshi Lv Liumin Suo |
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| Institution: | 1. Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Yangtze River Delta Physics Research Center Co. Ltd, Liyang, 213300, China |
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| Abstract: | Originating from the 1.23 V potential window of pure water, the narrow electrochemical stability window (ESW) has always been the most stubborn problem for aqueous battery systems. However, the water-in-salt system magically widens the ESW of aqueous electrolyte from 1.23 V to above 3 V by the super-concentrated LiTFSI solution. The mechanisms of widening aqueous battery ESW have been a crucial topic, in which the significant factors, including unique solid–electrolyte interface, solvation structure, and others, have been highlighted. Here, we specify the concept of ESW in detail and review the influence factors of ESW in the water-in-salt system from both thermodynamic and kinetic perspectives to explore the importance of each factor. |
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