Thermal stability and structural changes of Li4Mn5O12 under oxygen and nitrogen atmosphere

Toshimi Takada, Hiroshi Hayakawa, Toshiya Kumagai, Etsuo Akiba

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29 Citations (Scopus)

Abstract

The thermal stability and structural changes of well-crystallized Li4Mn5O12 powder with a grain size of 0.1-0.3 μm have been investigated with thermogravimetric analysis (TGA), X-ray diffraction (XRD), and high-temperature X-ray diffraction measurements (HT-XRD). Li4Mn5O12 crystallites are stable at temperatures up to 600°C in oxygen or air, but decompose to spinel LiMn2O4 and monoclinic Li2MnO3 at temperatures between 530 and 680°C, and to LiMnO2 and Mn3O4 at temperatures above 680°C in nitrogen. No apparent structural change was detected with XRD and HT-XRD when Li4Mn5O12 was heated in O2 up to 700°C, but a reversible weight loss/gain due to the evolution/uptake of oxygen was observed by TGA between 400-700°C. The deficiency of oxygen in Li4Mn5O12-δ is found to be in the region 0 < δ ≤ 0.5.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalJournal of Solid State Chemistry
Volume121
Issue number1
DOIs
Publication statusPublished - Jan 5 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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