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Issue 34, 2009
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Filter paper templated interconnected nanocrystalline LiMn2O4 with high coulombic efficiency and rate capability

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Abstract

A novel filter paper templating method has been developed to prepare nanocrystalline LiMn2O4. Whatman 42 filter paper impregnated with the precursor gel produces ultrafine powder (80–100 nm) when calcined at 800 °C. The structure and morphology of the powder and the template have been studied in detail by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). A single phase cubic spinel with interconnected powder morphology is found. The electrochemical properties have been studied using 2032 coin type cells in the potential window of 3.4 to 4.5 V versusLi/Li+. Sharp oxidation–reduction peaks at 4.09/3.90V and 4.22/4.04V in the cyclic voltagram indicate high crystallinity and good reversibility of the cathode. A typical cell shows an initial discharge capacity of 97 mAh/g with ∼98% columbic efficiency. Rate capability study of the synthesized cathode has been performed by cycling the cell for 130 cycles at different current densities (0.1–1.5 mA/cm2) and it is observed that 80–100% retention of initial capacity is possible when cycled at 0.1–0.6 mA/cm2. A capacity fading of only 0.03 mAh/g per cycle is observed even at 1.5 mA/cm2 (8C). Thus, we have shown that simple filter paper templating technique can produce nanocrystalline LiMn2O4 with high coulombic efficiency (100–95%) and rate capability.

Graphical abstract: Filter paper templated interconnected nanocrystalline LiMn2O4 with high coulombic efficiency and rate capability

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Publication details

The article was received on 16 Mar 2009, accepted on 09 Jun 2009 and first published on 07 Jul 2009


Article type: Paper
DOI: 10.1039/B905261E
Citation: J. Mater. Chem., 2009,19, 6161-6166
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    Filter paper templated interconnected nanocrystalline LiMn2O4 with high coulombic efficiency and rate capability

    M. W. Raja, S. Mahanty and R. N. Basu, J. Mater. Chem., 2009, 19, 6161
    DOI: 10.1039/B905261E

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