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Title: Preparation of Li(1.03)Mn(1.97)O(4) and Li(1.06)Mn(1.94)O(4) by the Polymer Precursor Method and X-ray, Neutron Diffraction and Electrochemical Studies
Authors: Reddy, MV
Raju, MJS
Sharma, N
Quan, PY
Nowshad, SH
Emmanuel, HEC
Peterson, VK
Chowdari, BVR
Keywords: Neutron Diffraction
X-ray Diffraction
Lithium ions
Inorganic Compounds
Lattice parameters
Issue Date: 1-Jan-2011
Publisher: The Electrochemical Society
Citation: Reddy, M. V., Raju, M. J. S., Sharma, N., Quan, P.Y., Nowshad, S.H., Emmanuel, H. E. C., Peterson, V. K., Chowdari, B. V. R. (2011). Preparation of Li(1.03)Mn(1.97)O(4) and Li(1.06)Mn(1.94)O(4) by the polymer precursor method and x-ray, neutron diffraction and electrochemical studies. Journal of the Electrochemical Society, 158(11), A1231-A1236. doi:10.1149/2.074111jes
Abstract: The compounds, Li(1.03)Mn(1.97)O(4) and Li(1.06)Mn(1.94)O(4) were prepared by the polymer precursor method followed by heat treatment at 650 degrees C for 6 hours in air. X-ray and neutron diffraction, scanning electron microscopy, and the Brunauer-Emmett-Teller surface area and density determination techniques were used to characterise the compounds. The lattice parameters obtained using neutron diffraction data of Li(1.03)Mn(1.97)O(4) and Li(1.06)Mn(1.94)O(4) are smaller than the parent LiMn(2)O(4) at a = 8.20717(17) and 8.22899(13) A degrees, respectively. Cyclic voltammetry studies were carried out in the potential range of 3.5-4.4V at scan rate of 0.058 mV/sec. Li-doped LiMn(2)O(4) showed the main cathodic and anodic redox peaks at similar to 3.9/4.0 and similar to 4.1/4.15V, respectively. The reversible charge capacities of Li(1.03)Mn(1.97)O(4) with an applied current rate of 360 mA g(-1) at the end of 2(nd) and 230(th) cycle are 88 and 83 (+/- 3) mAh g(-1), respectively. At a current rate of 600 mA g(-1) these charge capacities are 67 and 61 (+/- 3) mAh g(-1), respectively. Li(1.06)Mn(1.94)O(4) shows a capacity of 64 and 62 (+/- 3) mAh g(-1) at the end of 2(nd) and 100(th) cycles, respectively, at a current rate of 360 mA g(-1). (C) 2011 The Electrochemical Society.
Gov't Doc #: 3849
ISSN: 0013-4651
Appears in Collections:Journal Articles

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