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Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2: Promising electrode performance of β-MnO2-type nanowires

Title
Transformation from microcrystalline LiMn1-xCrxO 2 to ID nanostructured β-Mn1-xCrxO 2: Promising electrode performance of β-MnO2-type nanowires
Authors
Park D.H.Ha H.-W.Lee S.H.Choy J.-H.Hwang S.-J.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2008
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 112, no. 13, pp. 5160 - 5164
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Cr-substituted β-Mn1-xCrxO2 nanowires with nonaggregated morphology have been synthesized by the chemical oxidation of layered LiMn0.9Cr0.1O2 microcrystals under hydrothermal conditions at elevated temperature. According to powder X-ray diffraction analysis, a persulfate treatment at 200 °C gives rise to a unique transformation from a monoclinic-layered structure to a pyrolusite-(β-MnO2-) type structure. Electron microscopic analyses clearly demonstrated that the oxidized derivative consists of well-separated single-crystalline nanowires with a diameter of ∼30 nm and a length of several micrometers. Mn K-edge and Cr K-edge X-ray absorption spectroscopy and chemical analysis provide straightforward evidence for the substitution of chromium ions for the manganese sites of the pyrolusite-structured manganese oxide nanowires. Of special importance is that the present Cr-substituted β-MnO2-type nanowires show promising electrode performance for Li+ ion batteries, superior to those of pristine LiMn0.9Cr0.1O2, bulk β-MnO 2, and other structure-type manganese oxide nanowires including unsubstituted β-MnO2 nanowires. On the basis of the present experimental findings, we are able to conclude that the persulfate treatment under hydrothermal conditions provides a powerful method not only to prepare cation-substituted manganese oxide nanowires but also to improve the electrode performance of microcrystalline metal oxides through nanostructure fabrication. ©2008 American Chemical Society.
DOI
10.1021/jp710579y
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자연과학대학 > 화학·나노과학전공 > Journal papers
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