A new sodium vanadyl fluorophosphate as a high-rate and stable cathode for aqueous hybrid sodium-zinc batteries

Herein, a facile solvothermal method is used to prepare a new polyanion-type sodium vanadyl fluorophosphate (Na-x(VO)(2)(PO4)(y)F-z) for aqueous hybrid sodium-zinc batteries. The novel cathode delivers superior performance, which includes a high specific capacity of 87.2 mA h g(-1) at 0.05 A g(-1), good rate capability of 41.5 mA h g(-1) at 2 A g(-1), and high capacity retention. Based on ex situ XRD and XPS results, the Na+/Zn2+ co-insertion mechanism is proposed.

Automated summary

A novel polyanion-type sodium vanadyl fluorophosphate has been prepared for aqueous hybrid sodium-zinc batteries using a facile solvothermal method. The cathode material exhibits superior electrochemical performance, including high specific capacity, good rate capability, and high capacity retention.