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Magnetic phase transition of Li0.75CoO2 compared with LiCoO2 and Li0.5CoO2

  • A. Ito
  • K. Tanaka
  • H. Kawaji
  • T. Atake
  • N. Ando
  • Y. Hato
Article

Abstract

Magnetic and thermodynamic properties of the LiCoO2 positive-electrode material used in lithium-ion battery were first examined. Partially deintercalated LiCoO2 that is Li0.75CoO2, showed definite anomaly in the magnetic susceptibility at T=ca. 175 K probably related to magnetic phase transition which was supported by observation of a weak anomaly in heat capacity. On the other hand, LiCoO2 did not show such magnetic phase transition as expected, whereas Li0.5CoO2 a weak one in the similar temperature range. These behaviors are discussed in association with the mixing of Co3+ and Co4+ electronic structures.

Keywords

electrochemical deintercalation heat capacity LiCoO2 magnetic phase transition 

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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • A. Ito
    • 1
  • K. Tanaka
    • 1
  • H. Kawaji
    • 2
  • T. Atake
    • 2
  • N. Ando
    • 3
  • Y. Hato
    • 3
  1. 1.Department of Molecular EngineeringGraduate School of Engineering, Kyoto UniversityNishikyo-ku, KyotoJapan
  2. 2.Materials and Structures LaboratoryTokyo Institute of TechnologyMidori-ku, YokohamaJapan
  3. 3.Core Technology R&D GroupSubaru Technical Research CenterMitakaJapan

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