Synthesis of plate-like Li3V2(PO4)3/C as a cathode material for Li-ion batteries

摘要

Plate-like Li3V2(PO4)3/C composite is synthesized via a solution route followed by solid-state reaction. The Li3V2(PO4h/C plates are 40-100nm in thicknesses and 2-10|xm in lengths. TEM images show that a uniform carbon layer with a thickness of 5.3 nm presents on the surfaces of Li3V2(PO4)3 plates. The apparent Li-ion diffusion coefficient of the plate-like Li3V2(PO4)3/C is calculated to be 2.7 x 10-8 cm2 s~1. At a charge-discharge rate of 3C, the plate-like Li3V2(PO4)3/C exhibits an initial discharge capacity of 125.2 and 133.1 mAhg-1 in the voltage ranges of 3.0-4.3 and 3.0-4.8V, respectively. After 500 cycles, the electrodes still can deliver a discharge capacity of 111.8 and 97.8 mAh g~1correspondingly, showing a good cycling stability.