Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries

Abstract

In this paper, we report on the preparation of bare and Mg-doped Li(MgxCo1-x)O2 (x=0, 0.03, 0.05) phases by a molten salt method and their electrochemical properties. They were prepared at 800°C for 6h in air. Rietveld refined X-Ray Diffraction data of bare (x=0) and Mg-doped (x=0.03, 0.05) compounds show a well-ordered hexagonal layer-type structure (a ∼ 2.81Å, c ∼ 14.05Å). Scanning Electron Microscopy (SEM) show hexagonal type morphology at 800°C. Powder density was close to 5.02 gcm−3, which compares well with the theoretical value. Electrochemical properties were studied in the voltage range of 2.5-4.3V vs. Li using Cyclic Voltammetry (CV) and galvanostatic cycling. CV studies on bare and Mg-doped LiCoO2 show main cathodic and anodic redox peaks at ∼ 3.9V and ∼ 4.0V, respectively. Galvanostatic cycling of Li(MgxCo1-x)O2 (x=0, 0.03, 0.05) showed reversible capacity values at the 60th cycle to be: 147 (±3) mAh g−1 (x=0), 127 (±3) mAh g−1 (x=0.03), and 131 (±3) mAh g−1 (x=0.05) cycled at a current density of 30mAg−1. Capacity retention is also favourable at 98.5%.