Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries
Publication Type:Journal Article
Source:Electrochimica Acta, Elsevier Ltd, Volume 128, p.192-197 (2014)
Keywords:Cath-ode materials, Cathodes, Cyclic voltammetry, Electrochemical properties, Fused salts, Galvanostatic cycling, Lithium, Lithium compounds, Lithium-ion battery, Mg-doping, Molten salt method, Reversible capacity, scanning electron microscopy, Theoretical values, X ray diffraction, X-ray diffraction data
In this paper, we report on the preparation of bare and Mg-doped Li(Mg xCo1-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 6 h 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 ∼ 2.81 Å, c ∼ 14.05 Å). 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 2.5-4.3 V 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 ∼ 3.9 V and ∼ 4.0 V, 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 30 mA g-1. Capacity retention is also favourable at 98.5%. © 2013 Published by Elsevier Ltd. All rights reserved.
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Cite this Research Publication
M. Vab Reddy, Jie, T. Wac, Jafta, C. Jd, Ozoemena, K. Ide, Mathe, M. Kd, Nair, A. Sf, Peng, S. Sg, Idris, M. Sg, Balakrishna, Gh, Ezema, F. Ii, and Chowdari, B. V. Ra, “Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries”, Electrochimica Acta, vol. 128, pp. 192-197, 2014.