SYNTHESIS AND STUDIES ON LITHIUM IRON ORTHOSILICATE CATHODE MATERIALS VIA MODIFIED SOL-GEL METHOD

Abstract

Recently, Li2MSiO4 (M=Fe, Mn, Co) have received much interest as cathode materials for Li-ion batteries with high theoretical capacities and thermal stability. In this article, Li2FeSiO4 composites were synthesized by modified sol-gel methods with acetic acid used as reagent. Herein, effects of various preparation procedures on the structural properties of Li2FeSiO4 were studied. The materials were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Raman analysis. From the XRD patterns it is observed that some impurities are presented such as Li2SiO3 and Fe2O3. The functional group vibrations and molecular structure were confirmed by FTIR and RAMAN analysis.