Electrochemical Performance of Spherical Li_3V_2(PO_4)_3/C Synthesized by Spray Drying Method

摘要

Spherical Li_3V_2(PO_4)_3/C cathode materials have been successfully synthesized by a spray-drying method. The structure and morphology of the cathode materials are characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and thennogravimetric (TG) analysis. The results show that synthesized monoclinic Li_3V_2(PO_4)_3 with high purities exhibits spherical morphology, in favor of enhancing the capacities and cycling stability of Li_3V_2(PO_4)_3/C cathode materials for lithium-ion battery. The Li_3V_2(PO_4)_3/C cathode materials sintered at 750°C present best electrochemical performance among all the samples. It exhibits high initial discharge capacities of 99.2 rnAhg~(-1) and capacity retention of 93.6% after 200 cycles at a rate of 1C within a voltage range of 3.0-4,3 V,