Synthesis and Characterization of Composite Cathode Material xLiFePO_4·yLi_3V_2(PO_4)_3

5LiFePO4·Li3V2(PO4)3 was synthesized via calcining amorphous 5LiFePO4·Li3V2(PO4)3 obtained through lithiation of FePO4·xH2O and V2O5 by using oxalic acid as a novel reducing agent at room temperature.The crystal structure,morphology and electrochemical properties of the products were investigated.The results show that the sample synthesized at 650℃ for 12h has fine particle sizes of 100-200nm with homogenous sizes distribution.Electrochemical measurement results indicate that the material exhibites high rate characteristic and high discharge capacity of 158mAh/g(theoretic capacity 156.8mAh/g) and 114mAh/g at 1C and 10C rate,respectively.There is no obvious capacity fade observed after 100 cycles at 10C rate.The electrochemical performance of composite cathode material 5LiFePO4·Li3V2(PO4)3 is better than that of individual cathode material,such as LiFePO4 and Li3V2(PO4)3.