Aqueous Zn‐ion batteries have been considered as promising alternatives to Li‐ion batteries due to their abundant reserves, low price, and high safety. However, Zn anode shows poor reversibility and cycling stability in most conventional aqueous electrolytes. Here, a new type of aqueous Zn‐ion electrolyte based on ZnCl2–acetamide deep eutectic solvent with both environmental and economic friendliness has been prepared. The water molecule introduced in the “water‐in‐deep eutectic solvent” electrolyte could reduce the Zn2+ desolvation energy barrier by regulating Zn2+ solvation structure to promote uniform Zn nucleation. Zn anode shows improved electrochemical performance (≈98% Coulombic efficiency over 1000 cycles) in the electrolyte whose molar ratio of ZnCl2:acetamide:H2O is 1:3:1. The assembled full battery composed of phenazine cathode and Zn anode could stably cycle over 10 000 cycles with a high capacity retention of 85.7%. Overall, this work offers new insights into exploring new green electrolyte systems for Zn‐ion batteries.

The freeze aqueous electrolyte severely limit the operation of aqueous zinc-ion batteries (AZIBs) in low-temperature conditions own to the terrible ion conductivity and interface kinetics. Here, 4 M Zn(BF4)2 electrolyte...

possesses the smallest size and the lightest weight in comparison with other cation carrier ions. [11][12][13] Above all, proton can achieve fast conduction in aqueous systems by hydrogenbond formation/dissociation, which was first postulated by von

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Aqueous zinc-ion batteries (AZIBs) have gained extensive attention own to low cost and high safety but are bottlenecked by limited cathode materials. Here, we report an inverse-spinel structured Mg2MnO4 nanosheets...