Aqueous energy storage devices have been considered as one of the most promising candidates for large‐scale energy storage owing to their high safety and low cost. However, the narrow stability voltage window of electrolytes originating from the decomposition of water limits their energy density. In this Minireview, we discuss the limited energy density of aqueous energy storage devices in detail, and then the water decomposition mechanism and corresponding key factors. Furthermore, we present the comprehensive overview of the strategies for increasing the stability of aqueous electrolytes, including redox‐active additives, pH regulation of electrolytes, utilization of water‐in‐salt electrolytes, and selection of highly stable electrolyte salts. Finally, this Minireview also offers insights in the design of high‐voltage aqueous electrolytes.

中文翻译：

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用于水储能设备的高压电解质

水性储能设备由于其高安全性和低成本而被认为是最有前途的大规模储能设备之一。然而，源自水分解的电解质的窄稳定电压窗口限制了它们的能量密度。在此Minireview中，我们详细讨论了水性储能设备的有限能量密度，然后讨论了水分解机理和相应的关键因素。此外，我们对提高水性电解质稳定性的策略进行了全面概述，包括氧化还原活性添加剂，电解质的pH调节，盐分水中电解质的利用以及高稳定性电解质盐的选择。最后，本Minireview还提供了有关高压水性电解质设计的真知灼见。