The energy storage behavior of a phosphate-based cathode material in rechargeable zinc batteries

The energy storage behavior of the Li3V2(PO4)(3) cathode in zinc batteries is evaluated. The dissolution or decomposition into vanadium oxide in aqueous electrolytes is revealed. Using the optimal combination of water and acetonitrile solvents in electrolyte, those processes are effectively prevented without sacrificing the Zn2+ de/insertion kinetics. Further investigation demonstrates a water induced phase transformation into a VOPO4 type structure, which is still a polyanion material and preserves the high voltage. It delivers 128 mA h g(-1) capacity at 1C with 1.45 V discharge voltage, and 87 mA h g(-1) capacity is retained at 10C. A stable cycling is obtained for 1000 cycles.

Automated summary

The energy storage behavior of the Li3V2(PO4)(3) cathode in zinc batteries was evaluated, showing that the use of a combination of water and acetonitrile solvents in the electrolyte can effectively prevent dissolution or decomposition while maintaining high voltage. The cathode delivered a capacity of 128 mA h g(-1) at 1C and retained 87 mA h g(-1) at 10C, with stable cycling for 1000 cycles.