Characterizations on the structural and electronic properties of thermal lithiated Li0.33MnO2

JOURNAL OF ALLOYS AND COMPOUNDS

卷:470

Article

Wei, Y. J.²  Ehrenberg, H.³  Kim, K. B.¹  Park, C. W.⁴  Huang, Z. F.²  Baehtz, C.⁵ 

[1] Yonsei Univ, Div Mat Sci & Engn, Seoul 120749, South Korea

[2] Jilin Univ, Coll Mat Sci & Engn, Changchun 130023, Peoples R China

[3] IFW Dresden, Inst Complex Mat, D-01069 Dresden, Germany

[4] Korea Elect Technol Inst, Ctr Adv Batteries, Seoul, South Korea

[5] DESY, D-22607 Hamburg, Germany

关键词: Lithium battery;    Electrode materials;    Crystal structure;    Electronic property;   

DOI  :  10.1016/j.jallcom.2008.02.036

来源: Elsevier

【 摘 要 】

A 3V 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 similar to 140 mA hg(-1). 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 Mn4+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron. (C) 2008 Elsevier B.V. All rights reserved.

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