Aqueous Electrolytes: From Salt in Water to Water in Salt and Beyond

Traditional aqueous electrolytes have a limited electrochemical stability window due to the decomposition voltage of water (≈1.23 V). "Water-in-salt" (WIS) electrolytes, which expand the stability window of aqueous electrolytes from 1.23 to 3 V and spark a global surge of research in aqueous batteries, are developed. This breakthrough reveals novel aspects of solvation structure, ion transport mechanisms, and interfacial properties in WIS electrolytes, marking the start of a new era in solution chemistry that extends beyond traditional dilute electrolytes and has implications across electrolyte research. This review presents the current mechanistic understanding of WIS electrolytes and their derivative…

• UD
  U.S. Department of Energy
• NN
  National Natural Science Foundation of China

  Award: 22104121
• BE
  Basic Energy Sciences