Study on electrochemical performance of carbon-coated LiFePO₄

Abstract

This study discussed the synthesis of LiFePO 4 /C materials prepared by carbonthermal reduction method and the characterization of obtained composites. X-ray diffraction patterns show the synthesized product is LiFePO 4 phase without any existence of impurity. Scanning electron microscopic images show the synthesized LiFePO 4 particle is nano sized, and carbon forms a conductive network between LiFePO 4 particles. Transmission electron microscopy results indicate carbon successfully coated on the surface of LiFePO 4 particles. Raman spectroscopy shows the coated carbon has low degree of graphitization. Compared with pure LiFePO 4 samples, LiFePO 4 /C materials exhibit higher electronic conductivity and better electrochemical properties especially at high rate charge/discharge condition.