Water-in-Bisalt Electrolyte with Record Salt Concentration and Widened Electrochemical Stability Window

Forero Saboya, Juan,1992Chalmers tekniska högskola,Chalmers University of Technology (author)

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

Hosseini Bab Anari, Elham,1982Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elhamh (author)
Abdelhamid, Muhammad,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)muhabd (author)
Moth-Poulsen, Kasper,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mkasper (author)
Johansson, Patrik,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jpatrik (author)
Chalmers tekniska högskola (creator_code:org_t)

In:Journal of Physical Chemistry Letters: American Chemical Society (ACS)10:17, s. 4942-49461948-7185

By the author/editor: Forero Saboya, J ...; Hosseini Bab Ana ...; Abdelhamid, Muha ...; Moth-Poulsen, Ka ...; Johansson, Patri ...

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