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Title: Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries
Authors: Reddy, M.V. 
Jie, T.W.
Jafta, C.J.
Ozoemena, K.I.
Mathe, M.K.
Nair, A.S.
Peng, S.S.
Idris, M.S.
Balakrishna, G.
Ezema, F.I.
Chowdari, B.V.R. 
Keywords: Cathode
Electrochemical properties
Molten salt method
Issue Date: 10-May-2014
Citation: Reddy, M.V., Jie, T.W., Jafta, C.J., Ozoemena, K.I., Mathe, M.K., Nair, A.S., Peng, S.S., Idris, M.S., Balakrishna, G., Ezema, F.I., Chowdari, B.V.R. (2014-05-10). Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries. Electrochimica Acta 128 : 192-197. ScholarBank@NUS Repository.
Abstract: 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.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2013.10.192
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