The great concern about the availability of lithium is leading to an increasing interest in sodium ion batteries. Sodium is very abundant and widely available throughout the world, which make sodium-ion technology an attractive candidate for the development of large battery systems. Currently, the lack of well-performing cathode has been a limiting factor in the successful implementation of Na-ion technology. Therefore, there is a need to develop cathode materials in sodium ion batteries that can sustain long cycle life and display reasonable gravimetric capacity that can potentially challenge the lithium ion battery technology. In this regard one of the polyanion-based cathodes, Na₃V₂O₂(PO₄)₂F, is emerging as a viable candidate due to its high gravimetric capacity and long cycle-life. Recently it has been shown that Na₃V₂O₂(PO₄)₂F can be cycled between NaV₂O₂(PO₄)₂F and Na₄V₂O₂(PO₄)₂F leading to the possibility of achieving a theoretical energy density of 600 Wh Kg^–1. However, there is a challenge in the synthesis of phase pure composition of Na₃V₂O₂(PO₄)₂F. The unwanted by-product and the tendency of solid solution formation between the full fluoro and the oxo-fluoro derivatives, Na₃V₂O_2x(PO₄)₂F_3-2x (0 ≤ x ≤ 1), have created some confusion about the optimum performance of this material. In this presentation we will report a one-step soft chemical approach for the synthesis of phase pure Na₃V₂O₂(PO₄)₂F and their single-crystal X-ray structure determination. There is some new insights in terms of location of Na ion as emerged from single-crystal solution of this compound in tetragonal system and I4/mmm space group. The detail electrochemical activities of this material towards Na- and Li-ion batteries along with other spectroscopic and magnetic characterization will be presented.