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Na 3 V 2- x  Ti  x  (PO 4 ) 3 ( x = 0.00, 0.05, 0.10, and 0.15) was successfully synthesized by a conventional solid-state route. The XRD results show that Ti is incorporated in the lattice of Na 3 V 2 (PO 4 ) 3 and the tetragonal structure has not been changed after doping. Among all the composites, the Na 3 V 1.9 Ti 0.1 (PO 4 ) 3 composite delivers the highest discharge capacity of 114.87 mA h g -1 at 0.1C and possesses a capacity retention of 96.23% after 20 cycles at 0.1C, demonstrating the better rate performance and cycle stability in the potential range of 2.0-3.8 V. Electrochemical impedance spectroscopy (EIS) results reveal that the Na 3 V 1.9 Ti 0.1 (PO 4 ) 3 composite has a lower charge transfer resistance and a higher Na-ion diffusion coefficient compared to other composites. The results indicate that Ti-doping in Na 3 V 2 (PO 4 ) 3 can effectively enhance the electrochemical performance of this tetragonal compound, especially at a high charge/discharge rate.

Effect of Ti-doping on the electrochemical performance of sodium vanadium(iii) phosphate