Rational Lithium Salt Selection Principle for Designing High-Entropy Electrolytes toward High-Performance Lithium Metal Batteries

High-entropy electrolytes (HEEs), typically formed by mixing over four types of salts or solvents, have attracted considerable attention due to their diverse solvation microenvironments that improve the cyclability of high-energy lithium metal batteries (LMBs). However, knowledge of salt screening is limited beyond merely increasing the number of salts in electrolyte formulations to increase the solvation configurations. Here, we present a new design principle for constructing an HEE (LTFA-LDFN) by selecting lithium salts containing amphiphilic anions with asymmetric Li+-chelating capabilities (i.e., trifluoroacetate) together with anions featuring multiple Li+ coordination sites (i.e., difluorophosphate and…