Structural and morphological studies of manganese-based cathode materials for lithium ion batteries

摘要

Nanocrystalline powders: lithium-manganese oxide (LiMn2O4) of spinel and lithium-manganese phosphate (LiMnPO4) of olivine structure were synthesized by a modified sol-gel method. In this synthesizing process, lithium and manganese salts and complexing agent were used as reactants. The obtained powders were characterized by a number of methods: X-ray powder diffraction (XRD), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), atomic force microscopy (AFM) and Raman spectroscopy. The mean sizes of crystallites were about 30 nm for LiMn2O4 and 60 nm for LiMnPO4 nanoparticles. The influence of crystallographic structure on the stability of two manganese compounds was studied. The correlation between the structural and morphological results of spinel LiMn2O4 and olivine LiMnPO4 properties was examined for the first time in this work. (C) 2015 Elsevier B.V. All rights reserved.