Aqueous non-lithium based rechargeable batteries are emerging as promising energy storage devices thanks to their attractive rate capacities, long-cycle life, high safety, low cost, environmental-friendliness, and easy assembly conditions. However, the aqueous electrolytes with high ionic conductivity are always restricted by their intrinsically narrow electrochemical window. Encouragingly, the highly concentrated “water-in-salt” (WIS) electrolytes can efficiently expand the stable operation window, which brings up a series of aqueous high-voltage rechargeable batteries. In the mini review, we summarize the latest progress and contributions of various aqueous electrolytes for non-lithium (Na⁺, K⁺, Zn²⁺, Mg²⁺, and Al³⁺) based rechargeable batteries, and give a brief exploration of the operating mechanisms of WIS electrolytes in expanding electrochemically stable windows. Challenges and prospects are also proposed for WIS electrolytes toward aqueous non-lithium rechargeable metal ion batteries.

由于其有吸引力的速率容量，长循环寿命，高安全性，低成本，环境友好和易于组装的条件，水性非锂基可充电电池正成为有前途的储能设备。然而，具有高离子电导率的水性电解质总是受到其固有的狭窄电化学窗口的限制。令人鼓舞的是，高浓度的“盐包水”（WIS）电解质可以有效地扩大稳定的运行范围，从而带来了一系列水性高压可充电电池。在本篇迷你文章中，我们总结了各种非锂离子水溶液电解质（Na ⁺，K ⁺，Zn 2 ⁺，Mg ²⁺和Al ^3+）的最新进展和贡献。）为基础的可充电电池，并简要介绍了WIS电解质在扩大电化学稳定窗口方面的工作机制。对于含水非锂可充电金属离子电池，WIS电解质也提出了挑战和前景。