Enthalpy of formation of LixCoO2 (0.5 ≤ x ≤ 1.0)

Miaojun Wang, Alexandra Navrotsky, Sivaramakrishnan Venkatraman, Arumugam Manthiram

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18 Scopus citations


Single-phase 03-type LixCoO2 (0.5 ≤ x ≤ 1.0) samples were synthesized by chemically extracting lithium from LiCoO 2 with an oxidizer, NO2BF4, in acetonitrile medium under an argon atmosphere. The enthalpy of formation of Li xCoO2 at 298 K was determined by high-temperature oxide melt solution calorimetry. The enthalpy of formation from binary oxides plus oxygen for LixCoO2 at 298 K varies linearly with x, and LixCoO2 becomes energetically less stable with decreasing x. From the linear trend, the enthalpies of formation for O3-type CoO 2 and monoclinic Li0.5CoO2 were estimated. Monoclinic Li0.5CoO2 is energetically more stable than the undistorted O3-type Li0.5CoO2. For CoO2, the energetic stability decreases in the order O1 > P3 > O3.

Original languageEnglish (US)
Pages (from-to)J82-J84
JournalJournal of the Electrochemical Society
Issue number7
StatePublished - 2005
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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