NaV(6)O(15) microflowers as a stable cathode material for high-performance aqueous zinc-ion batteries

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.