Browsing by Author "Raju, MJS"

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    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
    (The Electrochemical Society, 2011-01-01) Reddy, MV; Raju, MJS; Sharma, N; Quan, PY; Nowshad, SH; Emmanuel, HEC; Peterson, VK; Chowdari, BVR
    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.