Freeze-drying synthesis of Li3V2(PO4)3/C cathode material for lithium-ion batteries

Li3V2(PO4)3/C cathode material was synthesized by using a freeze-drying method followed by carbon-thermal reduction. This as-prepared material has a uniform particle size distribution and a well carbon coating on the surface of Li3V2(PO4)3 particles. The Li3V2(PO4)3/C exhibits good electrochemical performance and cycling stability. Between 3.0 and 4.3 V, the composite delivered a reversible capacity of 125.2 mAh g−1 at a charge–discharge rate of 1.48 C (1 C = 133 mA g−1) and without obviously capacity fading after 100 cycles. Even at 14.8 C and 29.6 C rates, it can still deliver discharge capacities of 105.6 mAh g−1 and 93.3 mAh g−1, and the discharge capacities of 84.5 and 60.5 mAh g−1 are sustained after 500 cycles, respectively.

► Li3V2(PO4)3/C was synthesized by freeze-drying method.
► A specific capacity of 105.6 mAh g−1 can be obtained at 14.8 C.
► 93.3 mAh g−1 can be delivered at a higher current density of 29.6 C.
► The Li3V2(PO4)3/C electrode shows a good cycling performance.