Raja, Mir Wasim and Mahanty, Sourindra and Basu, Rajendra Nath (2009) Filter paper templated interconnected nanocrystalline LiMn(2)O(4) with high coulombic efficiency and rate capability. Journal of Materials Chemistry, 19 (34). pp. 6161-6166. ISSN 0959-9428

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Abstract

A novel filter paper templating method has been developed to prepare nanocrystalline LiMn(2)O(4). Whatman 42 filter paper impregnated with the precursor gel produces ultrafine powder (80-100 nm) when calcined at 800 degrees 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 versus Li/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 similar to 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/cm(2)) and it is observed that 80-100% retention of initial capacity is possible when cycled at 0.1-0.6 mA/cm(2). A capacity fading of only 0.03 mAh/g per cycle is observed even at 1.5 mA/cm(2) (8C). Thus, we have shown that simple filter paper templating technique can produce nanocrystalline LiMn(2)O(4) with high coulombic efficiency (100-95%) and rate capability.

Item Type:	Article
Subjects:	Electronics
Divisions:	Fuel Cell and Battery
Depositing User:	Bidhan Chaudhuri
Date Deposited:	01 Mar 2012 11:51
Last Modified:	01 Mar 2012 11:51
URI:	http://cgcri.csircentral.net/id/eprint/1087

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