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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 2+ /Li + hybrid-ion battery is fabricated using the LiV 3 O 8 nanorods as the cathode, metallic Zn as the anode, and 3 M Zn(OTf) 2 + 0.5 M LiOTf aqueous solution as the electrolyte. Compared with the batteries using pure 3 M Zn(OTf) 2 electrolyte, the cycle performance of the hybrid-ion battery is significantly improved. After 4000 cycles at 5 A g 1 , the remaining capacity is 163.9 mA h g -1 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 3 (OH) 2 V 2 O 7 ·2H 2 O by-product and restrict Zn dendrite growth during cycling, thereby improving the cycle performance of the batteries.

High-Capacity and Long-Lifespan Aqueous LiV3O8/Zn Battery Using Zn/Li Hybrid Electrolyte