Synthesis and Electrochemical Characteristics of Cathode Materials Li3V2(PO4)3

A novel rheological phase method was used to synthesize nanocrystalline Li3V2(PO4)(3) compound. In this route, LiOH center dot H2O, NH4VO3, NH4H2PO4 and citric acid were selected as starting materials to prepare precursor, and the Li3V2(PO4)(3) was obtained by sintering precursor at different temperature for 8 h in flowing argon. The Li3V2(PO4)(3) has been characterized by XRD and TEM techniques, the compound synthesized at 800 degrees C take on pure monoclinic crystal structure, the particle size of the samples are ranged from 200 similar to 500 nm and there is a layer of carbon particles on the surface of Li3V2(PO4)(3) particles, which is available for enhancing the conductivity of Li3V2(PO4)(3). The influence of sintering temperatures on electrochemical properties of Li3V3(PO4)(3) has been investigated also, the results showed that the Li3V2(PO4)(3) synthesized at 800 degrees C exhibited the highest initial discharge capacity (122 mAh.g(-1) at 0.1C and 107 mAh.g(-1) at 1C, respectively) and good capacity retention in the voltage range of 3.0 similar to 4.3 V. The electrochemical impedance spectroscopy (EIS) showed that the sample synthesized at 800 degrees C behaved the higher conductivity. The reasons for the excellent electrochemical performance of the carbon coated Li3V2(PO4)(3) calcined at 800 degrees C cathode material were presented also.