Studies of Li₃V₂(PO₄)₃ Additives for the LiFePO₄-Based Li Ion Batteries

Abstract

Compounds of LiFePO4-based materials with the addition of Li3V2(PO4)3 were simply prepared by a rheological phase reaction method. Differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, alternating current impedance, and charge−discharge cycles were used to evaluate the LiFePO4−Li3V2(PO4)3 compound powders. Phase analysis showed that no new phase formed in these compounds. The electronic conductivity and electrochemical performance of the LiFePO4-based compounds were improved by the addition of Li3V2(PO4)3 composites. High rate discharge capacity was developed for LiFePO4−Li3V2(PO4)3 as cathode material.