Highly Durable Na2V6O16•1.63H2O Nanowire Cathode for Aqueous Zinc-Ion Battery

Rechargeable aqueous zinc-ion batteries are highly desirable for grid-scale applications due to their low cost and high safety; however, the poor cycling stability hinders their widespread application. Herein, a highly durable zinc-ion battery system with a Na2V6O16 center dot 1.63H(2)O nanowire cathode and an aqueous Zn(CF3SO3)(2) electrolyte has been developed. The Na2V6O16 center dot 1.63H(2)O nanowires deliver a high specific capacity of 352 mAh g(-1) at 50 mA g(-1) and exhibit a capacity retention of 90% over 6000 cycles at 5000 mA g(-1), which represents the best cycling performance compared with all previous reports. In contrast, the NaV3O8 nanowires maintain only 17% of the initial capacity after 4000 cycles at 5000 mA g(-1). A single-nanowire-based zinc-ion battery is assembled, which reveals the intrinsic Zn2+ storage mechanism at nanoscale. The remarkable electrochemical performance especially the long-term cycling stability makes Na2V6O16 center dot 1.63H(2)O a promising cathode for a low-cost and safe aqueous zinc-ion battery.