Structural Change of Li1−<i>x</i>Ni0.5Mn0.5O2 Cathode Materials for Lithium-ion Batteries by Synchrotron Radiation

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  • Yoshinori Arachi
    Unit of Chemistry, Faculty of Engineering, Kansai UniversitySuita, Osaka
  • Hironori Kobayashi
    National Institute of Advanced Industrial Science and Technology (AIST)Ikeda, Osaka
  • Shuichi Emura
    ISIR, Osaka UniversityIbaraki, Osaka
  • Yoshiyuki Nakata
    Faculty of Science and Engineering, Iwakimeisei UniversityIwaki, Fukushima
  • Minoru Tanaka
    Unit of Chemistry, Faculty of Engineering, Kansai UniversitySuita, Osaka
  • Takeshi Asai
    Unit of Chemistry, Faculty of Engineering, Kansai UniversitySuita, Osaka

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<jats:title>Abstract</jats:title> <jats:p>Synchrotron X-ray diffraction and XAFS measurement have been employed to investigate structural change and the charging process of a layered LiNi0.5Mn0.5O2 cathode material. The structure of charged Li1−xNi0.5Mn0.5O2 (x=0.5), which corresponds to the composition for showing rechargeable capacity, was determined. The results showed that divalent nickel metal was oxidized to trivalent after charging, in association with the phase transition from hexagonal (R3-m) to monoclinic (C2/m) resulting from the ordering of cations in the layered structure.</jats:p>

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  • Chemistry Letters

    Chemistry Letters 32 (1), 60-61, 2002-12-20

    Oxford University Press (OUP)

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