LiMn1.8 Mg0.2O4 spinel cathode material for Li ion rechargeable batteries

Abstract

We have synthesized Mg doped lithium manganate spinel cathode material via sol-gel method (LiMn1.8 Mg0.2O4 ) for application in Li ion rechargeable batteries. The cathode material was annealed at different temperature from 500¿900°C. C. It was found that the best crystallinity of the powder was obtained at 800°C. The lattice parameters for the material annealed at 500, 600, 700, 800, and 900°C was found 8.1320 Å, 8.1423 Å, 8.1631 Å, 8.1630 Å, 8.1757 Å, respectively. The cyclic voltammetric studies reveal intercalation-deintercalation of Li ion from the cathode material. The initial discharge capacity of LiMn1.8 Mg0.2O4 cathode material was found to be about 120 mAh/g. The rate cycleability studies show a very stable nature of LiMn1.8 Mg0.2O4 cathode at higher discharge currents (0.5 and 1 mA/cm2).