| Summary: | Aqueous zinc-ion batteries (AZIBs) are promising candidates for large-scale energy storage because of their low cost and high safety. However, their practical applications are impeded by low energy density and short service life. Here, an aqueous Zn<sup>2+</sup>/Li<sup>+</sup> hybrid-ion battery is fabricated using the LiV<sub>3</sub>O<sub>8</sub> nanorods as the cathode, metallic Zn as the anode, and 3 M Zn(OTf)<sub>2</sub> + 0.5 M LiOTf aqueous solution as the electrolyte. Compared with the batteries using pure 3 M Zn(OTf)<sub>2</sub> electrolyte, the cycle performance of the hybrid-ion battery is significantly improved. After 4000 cycles at 5 A g<sup>1</sup>, the remaining capacity is 163.9 mA h g<sup>−1</sup> with impressive capacity retention of 87.0%. Ex-situ XRD, ex-situ XPS, and SEM tests demonstrate that the hybrid electrolyte can inhibit the formation of the irreversible Zn<sub>3</sub>(OH)<sub>2</sub>V<sub>2</sub>O<sub>7</sub>·2H<sub>2</sub>O by-product and restrict Zn dendrite growth during cycling, thereby improving the cycle performance of the batteries.
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