Amorphous FeVO4 as high-capacity cathode precursor for lithium second battery

Abstract

Various vanadates have been investigated to accelerate the development of advanced technologies, especially in the area of electronics. Amorphous FeVO4 was synthesized by the liquid phase precipitation method. This precursor was firstly discharged and then charged as cathode material of lithium second battery, in which the valence of two kinds of metals can be changed. Thermal analysis (TG-DTA), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) have been used for their characterization. The result revealed the existence of two pairs of redox couples, Fe3+/Fe2+ and V5+/V4+. The electrochemical investigation has shown that at higher potentials amorphous FeVO4 can react with 1, 1.5 and 2 mol Li, respectively.