Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Materials by Microwave-Assisted Carbothermal Reduction Method
The lithium vanadium phosphate (Li3V2(PO4)3) cathode materials were synthesized by microwave- assisted carbothermal reduction method. The effects of microwave heating time and Li/V molar ratio on the structure and electrochemical performance of the prepared samples were investigated. The results show that the perfect crystal growth and good electrochemical performance ( first charge / discharge specific capacity of 160.8 mAh•g-1/151.3 mAh•g-1 and discharge decay rate of 7.90% after 30 cycles ) of the Li3V2(PO4)3 were obtained under the optimal conditions of heating time 11 min and Li/V molar ratio 3.05:2.0. The voltage values appeared at the oxidation and reduction peaks of the cyclic voltammetry curves were proved to be basically consistent with those appeared at the charge / discharge curves. The lithium ion diffusion coefficient was determined to be 2.320 ×10-9 cm2•s-1 by electrochemical impedance spectroscopy and mathematical models derived from simulative equivalent circuit.
Jingtao Han, Zhengyi Jiang and Sihai Jiao
B. Q. Jiang et al., "Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Materials by Microwave-Assisted Carbothermal Reduction Method", Advanced Materials Research, Vols. 156-157, pp. 1199-1202, 2011