Investigations on the synthesis and electrochemical performance of Li3V2(PO4)3/C by different methods

Li3V2(PO4)(3)/C samples were synthesized by two different synthesis methods. Their influence on electrochemical performances of Li3V2(PO4)(3)/C as cathode materials for lithium-ion batteries was investigated. The structure and morphology of Li3V2(PO4)(3)/C samples were characterized by X-ray diffraction and scanning electron microscopy. Electrochemical performance was characterized by charge/discharge, cyclic voltammetry, and alternating current (AC) impedance measurements. Li3V2(PO4)(3)/C with smaller grain size showed better performances in terms of the discharge capacity and cycle stability. The improved electrochemical properties of the Li3V2(PO4)(3)/C were attributed to the decreasing grain size and enhanced electrical conductivity produced via low temperature route. AC impedance measurements also showed that the Li3V2(PO4)(3)/C synthesized by low temperature route significantly decreased the charge-transfer resistance and shortened the migration distance of lithium ion.