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Title: Novel synthesis and electrochemical behavior of layered LiNi0.5Mn0.5O2
Authors: Xia, H.
Tang, S.B. 
Lu, L. 
Keywords: Electrode materials
Lithium-ion batteries
Solid state reactions
X-ray diffraction
Issue Date: 31-Jan-2008
Citation: Xia, H., Tang, S.B., Lu, L. (2008-01-31). Novel synthesis and electrochemical behavior of layered LiNi0.5Mn0.5O2. Journal of Alloys and Compounds 449 (1-2) : 296-299. ScholarBank@NUS Repository.
Abstract: A novel and simple solid state synthesis of layered LiNi0.5Mn0.5O2 directly from a mixture of LiOH, NiO and MnO2 prepared by ball milling is reported. The mixtures of precursors were heated at temperatures from 400 to 1000 °C in air to synthesize the compound. The heat treatment process and the crystal structure of the synthesized material were investigated by TG/DTA and X-ray diffraction (XRD) methods. The well-crystallized LiNi0.5Mn0.5O2 powder of single phase was prepared at 1000 °C. Morphology of the synthesized material was investigated using field emission scanning electron microscopy (FESEM). X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) measurements were carried out on the synthesized LiNi0.5Mn0.5O2 powder suggesting that the oxidation states of Ni and Mn in LiNi0.5Mn0.5O2 be +2 and +4, respectively. Galvanostatic charge-discharge behavior of the Li/LiNi0.5Mn0.5O2 cell in the voltage range 2.5-4.3 V at a current rate of 0.1 mA cm-2 exhibited a stable discharge capacity of ∼120 mAh g-1 with a very small capacity fading for 10 cycles. © 2006 Elsevier B.V. All rights reserved.
Source Title: Journal of Alloys and Compounds
ISSN: 09258388
DOI: 10.1016/j.jallcom.2006.02.097
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