Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623072 | Journal of Alloys and Compounds | 2009 | 5 Pages |
Abstract
A 3 V cathode material for lithium ion batteries, Li0.33MnO2, was synthesized by solid-state reaction. Two Mn crystallographic positions, Mn(1) and Mn(2), were determined by X-ray diffraction analysis. The [Mn(2)O6] octahedron had a lower symmetrical degree than that of [Mn(1)O6], which was attributed to the geometrical effects of the non-symmetrical environment around Mn(2). Li0.33MnO2 delivered a reversible discharge capacity â¼140 mA h gâ1. In situ synchrotron diffraction clearly showed a reversible phase transition of Li0.33MnO2 during electrochemical process. The analysis of X-ray absorption near edge spectroscopy observed the conversion of Mn4+ to Mn3+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Y.J. Wei, H. Ehrenberg, K.B. Kim, C.W. Park, Z.F. Huang, C. Baehtz,