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Title: Preparation of Li(Ni 0.5Mn 1.5)O 4 by polymer precursor method and its electrochemical properties
Authors: Reddy, M.V. 
Cheng, H.Y.
Tham, J.H.
Yuan, C.Y. 
Goh, H.L.
Chowdari, B.V.R. 
Keywords: Cathode
Electrochemical properties
Li(Ni 0.5Mn 1.5)O 4
Polymer precursor method
X-ray diffraction
Issue Date: 15-Feb-2012
Citation: Reddy, M.V., Cheng, H.Y., Tham, J.H., Yuan, C.Y., Goh, H.L., Chowdari, B.V.R. (2012-02-15). Preparation of Li(Ni 0.5Mn 1.5)O 4 by polymer precursor method and its electrochemical properties. Electrochimica Acta 62 : 269-275. ScholarBank@NUS Repository.
Abstract: We have prepared a 4.8 V voltage cathode, Li(Ni 0.5Mn 1.5)O 4 using the polymer polyvinylpyrrolidone (PVP) as precursor at temperatures ranging from 700 to 750 °C for 6 h in air. The Rietveld refined X-ray diffraction patterns of Li(Ni 0.5Mn 1.5)O 4 showed a spinel type structure with a lattice parameter value of ∼8.174(2) . The Scanning Electron Microscope (SEM) images showed particle size in the range, ∼100-3000 nm. The surface area of the prepared powders was characterized by the Brunauer-Emmett-Teller (BET) technique. Cathodic electrochemical properties were evaluated using cyclic voltammetry (CV) and galvanostatic cycling (GC) in the range 3.5-5.0 V vs. Li/Li + at ambient temperature. CV studies showed a minor peak at ∼4.0 V due to the Mn 3+/4+ redox couple, and main anodic/cathodic peaks at 4.75/4.6 V and 4.8/4.7 V corresponding to the Ni 2+/4+ redox couples. The GC studies were carried out at the current rates (C/4.5) 30 mA g -1 and (C/1.2) 120 mA g -1, at room temperature. The reversible capacities of all samples prepared at 700-750 °C are in the range, 92-130 (±3) mAh g -1 at the end of 15th cycle. Impedance studies were carried out on a selected cell. © 2012 Elsevier Ltd.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2011.12.029
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