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Development of High‐Voltage Aqueous Electrochemical Energy Storage Devices

High voltage aqueous electrochemical energy storage devices have gained significant attention recently due to their high safety, low cost, and environmental friendliness. Through the addition of a solid‐electrolyte interphase, usage of a concentrated electrolyte or adjustment of the pH of their electrolytes, it is hopeful to endow these aqueous energy‐storage devices with a broadened voltage. Among all of them, aqueous lithium‐ion batteries have a longer lifespan and a promising future in energy storage systems. Herein, aqueous batteries will be introduced by demonstrating their voltage improvement approaches and progress is focused.