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.
Competing Interests: There are no conflicts to declare.
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