Water-in-Bisalt Electrolyte with Record Salt Concentration and Widened Electrochemical Stability Window
Journal article, 2019

Water-in-salt and water-in-bisalt electrolytes have recently attracted much attention due to their expanded electrochemical stability windows. The concentration limit of such electrolytes is constrained by the solubility of the lithium salts employed, ca. 21 m (mol kg−1) for LiTFSI (lithium bis(trifluoromethanesulfonyl)imide). By adding a second lithium salt, the total salt concentration can be increased, but the hydrogen evolution keeps limiting the application of such systems in batteries with low potential anodes. Herein we report a water-in-bisalt electrolyte with a record salt concentration (31.4 m LiTFSI + 7.9 m Li[N(CH3)2((CH2)3SO3)((CH2)4SO3)]) in which the bulky anion completely prevents the crystallization, even at such low water contents. Although the hydrogen evolution reaction is not completely suppressed, the expanded electrochemical stability window allows for low potential reactions such as aluminum−lithium alloying. The high salt concentration favors the formation of a suitable passivation layer that can be further engineered by modifying the anion structure


Juan Forero Saboya

Chalmers, Physics, Materials Physics

Elham Hosseini Bab Anari

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Kasper Moth-Poulsen Group

Muhammad Abdelhamid

Chalmers, Physics, Materials Physics

Kasper Moth-Poulsen

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Kasper Moth-Poulsen Group

Patrik Johansson

Chalmers, Physics, Materials Physics

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 10 4942-4946

Subject Categories

Inorganic Chemistry

Other Engineering and Technologies

Chemical Engineering

Other Chemical Engineering

Other Chemistry Topics

Areas of Advance


Materials Science



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