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Reversible aqueous zinc-ion batteries (ZIBs) have great potential for large-scale energy storage owing to their low cost and safety. However, the lack of long-lifetime positive materials severely restricts the development of ZIBs. Herein, we report NaV 6 O 15 microflowers as a cathode material for ZIBs with excellent electrochemical performance, including a high specific capacity of ∼300 mA h g -1 at 100 mA g -1 and 141 mA h g -1 maintained after 2000 cycles at 5 A g -1 with a capacity retention of ∼107%. The high diffusion coefficient and stable tunneled structure of NaV 6 O 15 facilitate Zn 2+ intercalation/extraction and long-term cycle stability., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Rechargeable aqueous zinc ion batteries (ZIBs), owing to their low-cost zinc metal, high safety and nontoxic aqueous electrolyte, have the potential to accelerate the development of large-scale energy storage applications. However, the desired development is significantly restricted by cathode materials, which are hampered by the intense charge repulsion of bivalent Zn 2+ . Herein, the as-prepared VO 2 (A) hollow spheres via a feasible hydrothermal reaction exhibit superior zinc ion storage performance, large reversible capacity of 357 mA h g -1 at 0.1 A g -1 , high rate capability of 165 mA h g -1 at 10 A g -1 and good cycling stability with a capacity retention of 76% over 500 cycles at 5 A g -1 . Our study not only provides the possibility of the practical application of ZIBs, but also brings a new prospect of designing high-performance cathode materials., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)