Competitive salt precipitation/dissolution during free‐water reduction in water‐in‐salt electrolyte

R. Bouchal, Z. Li, C. Bongu, S. Le Vot, R. Berthelot, B. Rotenberg, F. Favier, S.A. Freunberger, M. Salanne, O. Fontaine, Angewandte Chemie (2020).

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Journal Article | Epub ahead of print | English

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Author
Bouchal, Roza; Li, Zhujie; Bongu, Chandra; Le Vot, Steven; Berthelot, Romain; Rotenberg, Benjamin; Favier, Frederic; Freunberger, Stefan AlexanderIST Austria ; Salanne, Mathieu; Fontaine, Olivier
Department
Abstract
Water-in-salt electrolytes based on highly concentrated bis(trifluoromethyl)sulfonimide (TFSI) promise aqueous electrolytes with stabilities approaching 3 V. However, especially with an electrode approaching the cathodic (reductive) stability, cycling stability is insufficient. While stability critically relies on a solid electrolyte interphase (SEI), the mechanism behind the cathodic stability limit remains unclear. Here, we reveal two distinct reduction potentials for the chemical environments of ‘free’ and ‘bound’ water and that both contribute to SEI formation. Free-water is reduced ~1V above bound water in a hydrogen evolution reaction (HER) and responsible for SEI formation via reactive intermediates of the HER; concurrent LiTFSI precipitation/dissolution establishes a dynamic interface. The free-water population emerges, therefore, as the handle to extend the cathodic limit of aqueous electrolytes and the battery cycling stability.
Publishing Year
Date Published
2020-05-10
Journal Title
Angewandte Chemie
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Bouchal R, Li Z, Bongu C, et al. Competitive salt precipitation/dissolution during free‐water reduction in water‐in‐salt electrolyte. Angewandte Chemie. 2020. doi:10.1002/ange.202005378
Bouchal, R., Li, Z., Bongu, C., Le Vot, S., Berthelot, R., Rotenberg, B., … Fontaine, O. (2020). Competitive salt precipitation/dissolution during free‐water reduction in water‐in‐salt electrolyte. Angewandte Chemie. https://doi.org/10.1002/ange.202005378
Bouchal, Roza, Zhujie Li, Chandra Bongu, Steven Le Vot, Romain Berthelot, Benjamin Rotenberg, Frederic Favier, Stefan Alexander Freunberger, Mathieu Salanne, and Olivier Fontaine. “Competitive Salt Precipitation/Dissolution during Free‐water Reduction in Water‐in‐salt Electrolyte.” Angewandte Chemie, 2020. https://doi.org/10.1002/ange.202005378.
R. Bouchal et al., “Competitive salt precipitation/dissolution during free‐water reduction in water‐in‐salt electrolyte,” Angewandte Chemie, 2020.
Bouchal R, Li Z, Bongu C, Le Vot S, Berthelot R, Rotenberg B, Favier F, Freunberger SA, Salanne M, Fontaine O. 2020. Competitive salt precipitation/dissolution during free‐water reduction in water‐in‐salt electrolyte. Angewandte Chemie.
Bouchal, Roza, et al. “Competitive Salt Precipitation/Dissolution during Free‐water Reduction in Water‐in‐salt Electrolyte.” Angewandte Chemie, Wiley, 2020, doi:10.1002/ange.202005378.
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