EFFECT OF MAGNESIUM DOPING ON THE STRUCTURAL STABILITY OF LAYERED LINIO2 BASED CATHODE MATERIALS.

In rechargeable lithium batteries, nickel is employed in the form of oxide in which lithium ions are inserted into its crystal structure to form layered nickel oxide i.e., LiNiO2. The objective of this paper is to understand the effects of substitution of magnesium on the structural stability in the layered intercalation compounds. The compounds LiNiO2 and LiNi0.75Mg0.25O2 are synthesized by a solid state reaction method under the flow of air at 800 °C for 24 hours. The influence of doping Mg on structure, morphology and bonding nature of cathode materials are investigated systematically. From the x-ray diffraction (XRD) data, the intensity versus diffraction angle peak indicated that the compound crystallized as a rhombohedral system (space group ). The lattice constants and crystallite sizes were computed from XRD data. The particle morphology of the compound was observed using a field effect scanning electron microscope (FESEM). The FT-IR spectroscopic data of LiNiO2 revealed the local structure of the oxide lattice constituted by LiO6 and NiO6 octahedra.