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

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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.

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Authors and Affiliations

  1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan

    A. Ito & K. Tanaka

  2. Materials and Structures Laboratory, Tokyo Institute of Technology, Midori-ku, Yokohama, 226-8503, Japan

    H. Kawaji & T. Atake

  3. Core Technology R&D Group, Subaru Technical Research Center, Fuji Heavy Industries Ltd., 3-9-6 Ohsawa, Mitaka, 181-8577, Japan

    N. Ando & Y. Hato

Authors
  1. A. Ito
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  2. K. Tanaka
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  3. H. Kawaji
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  4. T. Atake
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  5. N. Ando
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  6. Y. Hato
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Correspondence to A. Ito.

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Ito, A., Tanaka, K., Kawaji, H. et al. Magnetic phase transition of Li0.75CoO2 compared with LiCoO2 and Li0.5CoO2 . J Therm Anal Calorim 92, 399–401 (2008). https://doi.org/10.1007/s10973-007-8959-x

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  • DOI: https://doi.org/10.1007/s10973-007-8959-x

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