High-Performance Aqueous Zinc-Ion Battery Based on Layered H2 V3 O8 Nanowire Cathode

Abstract

Rechargeable aqueous zinc-ion batteries have offered an alternative for large-scale energy storage owing to their low cost and material abundance. However, developing suitable cathode materials with excellent performance remains great challenges, resulting from the high polarization of zinc ion. In this work, an aqueous zinc-ion battery is designed and constructed based on H₂ V₃ O₈ nanowire cathode, Zn(CF₃ SO₃ )₂ aqueous electrolyte, and zinc anode, which exhibits the capacity of 423.8 mA h g^-1 at 0.1 A g^-1 , and excellent cycling stability with a capacity retention of 94.3% over 1000 cycles. The remarkable electrochemical performance is attributed to the layered structure of H₂ V₃ O₈ with large interlayer spacing, which enables the intercalation/de-intercalation of zinc ions with a slight change of the structure. The results demonstrate that exploration of the materials with large interlayer spacing is an effective strategy for improving electrochemical stability of electrodes for aqueous Zn ion batteries.

Keywords: H2V3O8; intercalation reaction; large-scale energy storage; zinc-ion batteries.