Characterizations on the structural and electronic properties of thermal lithiated Li 0.33 MnO 2

Y. J. Wei, H. Ehrenberg, Kwang Bum Kim, C. W. Park, Z. F. Huang, C. Baehtz

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A 3 V cathode material for lithium ion batteries, Li 0.33 MnO 2 , 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) O 6 ] octahedron had a lower symmetrical degree than that of [Mn (1) O 6 ], which was attributed to the geometrical effects of the non-symmetrical environment around Mn (2) . Li 0.33 MnO 2 delivered a reversible discharge capacity ∼140 mA h g -1 . In situ synchrotron diffraction clearly showed a reversible phase transition of Li 0.33 MnO 2 during electrochemical process. The analysis of X-ray absorption near edge spectroscopy observed the conversion of Mn 4+ to Mn 3+ with Li + intercalation into Li 0.33 MnO 2 , accompanied by the formation of more severely distorted [MnO 6 ] octahedron.

Original languageEnglish
Pages (from-to)273-277
Number of pages5
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 2009 Feb 20

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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