Abstract
Aqueous lithium-ion batteries possess great potential due to their low cost and high safety. However, the narrow voltage window of the electrolyte significantly hinders their energy density and electrode materials selection. Herein, sheet-like todorokite-type magnesium manganese oxide molecular sieve (Mg-OMS-1) is synthesized and applied as cathode materials for aqueous lithium-ion batteries with water-in-salt electrolyte. The water-in-salt lithium difluorosulfonimide (LiTFSI) electrolyte enlarges the working window of the device and enhance the capacity of the Mg-OMS-1. Mg-OMS-1 displays a high capacity, remarkable rate ability, and stable cycling performance. Moreover, the water-in-salt electrolyte promises the device to work in the temperature range of 0–70 ℃. In addition, an active carbon (AC)|15 mol kg−1 LiTFSI|Mg-OMS-1 capacitor battery is designed and assembled. The device presents a capable electrochemical performance, demonstrating the potential application of the water-in-salt electrolyte and Mg-OMS-1 for the aqueous batteries with high energy density and wide operating temperature.
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