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Energy Storage Electrolytes
In energy storage electrolytes, the “water‐in‐salt” approach is gaining traction, with a high concentration of LiTFSI salt in water. In article number 2303945, Roza Bouchal, Olivier Fontaine, and co‐workers reveal LiTFSI's birefringence and the intriguing dendrite formation due to its precipitation during water reduction in this distinctive electrolyte.
A water‐in‐salt electrolyte is a highly concentrated aqueous solution (i.e., 21 mol LiTFSI in 1 kg H2O) that reduces the number of water molecules surrounding salt ions, thereby decreasing the water activity responsible for decomposition. This electrolyte widens the electrochemical stability window via the formation of a solid electrolyte interphase (SEI) at the electrode surface. However, using high...
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