Synthesis, structural and electrochemical studies of cathode materials

The cathode material of lithium ion batteries LiFe0.3Co0.7O2 (LFC7) is synthesized by sol-gel method. X-ray diffraction studies were done at room temperature and revealed the presence of the rhombohedral structure. The surface morphology of the samples is observed using SEM and the average grain size is calculated. An energy dispersive spectrum (EDS) is used to analyze the percentage of metallic elements in a compound. The vibrational spectral studies of the compound through Fourier transform infrared spectra (FTIR) analysis were undertaken at room temperature in the wave number region 450-4000 cm(-1). The impedance spectroscopic studies of the samples in the temperature region 30-500 degrees C at different frequencies show the presence of relaxing species in samples. Cyclic voltammetry studies are done in a three electrode test cell. Highest specific capacitance observed is 553 Fg(-1) at scan rate 0.5mAg(-1)in 1M K2SO4 aqueous electrolyte within the potential range 0.0 V to + 1.0 V. (c) 2018 Elsevier Ltd. All rights reserved.