Abstract
A family of mixed LiNixCo(1-x)VO4 (x = 0.2, 0.8) cathode materials has been synthesized using the sol–gel method. The thermal behavior of the materials has been examined by thermogravimetric (TG) analysis. The Rietveld refinement of powder X-ray diffraction showed the structure with $$ Fd\overline{3}m $$ (227) space group. Surface analysis was performed using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Analysis of Raman spectra reveals the local environment model including VO4 tetrahedra, (Ni,Co)O6, and LiO6 octahedra as vibrational local units. X-ray photoelectron spectroscopy (XPS) studies on synthesized powder indicate that the oxidation states of nickel, cobalt, and vanadium are + 2, + 3 and + 5, respectively. Charge–discharge cycling tests were carried out to study the performance of the cathode materials.
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