LiMO2 (M=Mn, Fe, and Co): Energetics, polymorphism and phase transformation

Miaojun Wang, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

LiMO2 materials (M=Mn, Fe, and Co) with different structures were synthesized and their enthalpies of formation from oxides (Li2O and M2O3, M=Mn and Fe), or from oxides (Li2O and CoO) plus oxygen at 25 °C were determined by high-temperature oxide melt solution calorimetry. The relative stability of the polymorphs of the compound LiMO2 was established based on their enthalpies of formation. Phase transformations in LiFeO2 were investigated by differential scanning calorimetry and high-temperature oxide melt solution calorimetry. The phase transition enthalpies at 25 °C for β→α, γ→β, and γ→α are 4.9±0.7, 4.3±0.8 and 9.2±0.9kJ/mol, respectively. Thus the γ phase (ordered cations) is the stable form of LiFeO2 at room temperature, the α phase (disordered cations) is stable at high temperature and the β phase may have a stability field at intermediate temperatures.

Original languageEnglish (US)
Pages (from-to)1230-1240
Number of pages11
JournalJournal of Solid State Chemistry
Volume178
Issue number4
DOIs
StatePublished - Apr 2005
Externally publishedYes

Keywords

  • Battery materials
  • Enthalpy of formation
  • LiMO
  • Phase transformation
  • Rock-salt

ASJC Scopus subject areas

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

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