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

Y. J. Wei; H. Ehrenberg; K. B. Kim; C. W. Park; Z. F. Huang; C. Baehtz

doi:10.1016/j.jallcom.2008.02.036

Characterizations on the structural and electronic properties of thermal lithiated Li_0.33MnO₂

Y. J. Wei, H. Ehrenberg, K. B. Kim, C. W. Park, Z. F. Huang, C. Baehtz

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

A 3 V cathode material for lithium ion batteries, Li_0.33MnO₂, 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₎. Li_0.33MnO₂ delivered a reversible discharge capacity ∼140 mA h g^-1. In situ synchrotron diffraction clearly showed a reversible phase transition of Li_0.33MnO₂ during electrochemical process. The analysis of X-ray absorption near edge spectroscopy observed the conversion of Mn⁴⁺ to Mn³⁺ with Li⁺ intercalation into Li_0.33MnO₂, accompanied by the formation of more severely distorted [MnO₆] octahedron.

Original language	English
Pages (from-to)	273-277
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	470
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2008.02.036
Publication status	Published - 2009 Feb 20

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Characterizations on the structural and electronic properties of thermal lithiated Li0.33MnO2",

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 ∼140 mA h g-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 Mn3+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron.",

author = "Wei, {Y. J.} and H. Ehrenberg and Kim, {K. B.} and Park, {C. W.} and Huang, {Z. F.} and C. Baehtz",

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T1 - Characterizations on the structural and electronic properties of thermal lithiated Li0.33MnO2

AU - Wei, Y. J.

AU - Ehrenberg, H.

AU - Kim, K. B.

AU - Park, C. W.

AU - Huang, Z. F.

AU - Baehtz, C.

PY - 2009/2/20

Y1 - 2009/2/20

N2 - 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 ∼140 mA h g-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 Mn3+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron.

AB - 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 ∼140 mA h g-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 Mn3+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron.

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