Navajoite phase V5O12?6H2O nanorods with ultra-long lifespan for aqueous zinc-ion batteries

摘要

Aqueous zinc-ion batteries have attracted wide attention because of their low cost and high safety ad-vantages, whereas the cathode materials with stable internal structure and fast transfer channels are ur-gently needed. Herein, a Navajoite phase V5O12 center dot 6 H2O nanorods has been prepared via a facile hydrothermal method, and proved to be a good choice as the cathode of ZIBs because of the excellent structural stability and special Zn2+ ion transfer channel. Electrochemical measurements demonstrate that the as-fabricated V5O12 center dot 6 H2O nanorods can disclose a high rate performance (405 mA h g-1 under 0.1 A g-1), a long-term cyclability (81.2% maintained after 20,000 cycles under 10 A g-1) and an excellent energy output (338.04 Wh kg-1 at 227 W kg-1). In addition, various ex-situ characterizations have revealed the electro-chemical mechanism in V5O12 center dot 6 H2O cathode during reversible Zn2+ ion intercalation/de-intercalation process. The impressive electrochemical performance of V5O12 center dot 6 H2O cathode shows its high potential in practical applications.

关键词