Electronic structure of Li<inf>1+</inf><inf>x</inf>[Mn<inf>0.5</inf>Ni<inf>0.5</inf>]<inf>1-</inf><inf>x</inf>O<inf>2</inf> studied by photoemission and x-ray absorption spectroscopy

Y. Yokoyama, D. Ootsuki, T. Sugimoto, H. Wadati, J. Okabayashi, Xu Yang, Fei Du, Gang Chen, Takashi Mizokawa

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We have studied the electronic structure of Li<inf>1+</inf><inf>x</inf>[Mn<inf>0.5</inf>Ni<inf>0.5</inf>]<inf>1-</inf><inf>x</inf>O<inf>2</inf> (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn<sup>3+</sup> component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn<sup>3+</sup> ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn<sup>3+</sup> component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn<sup>3+</sup>.

    Original languageEnglish
    Article number033903
    JournalApplied Physics Letters
    Volume107
    Issue number3
    DOIs
    Publication statusPublished - 2015 Jul 20

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    x ray absorption
    x ray spectroscopy
    absorption spectroscopy
    photoelectric emission
    electronic structure
    electric batteries
    ions
    cathodes
    valence
    sensitivity
    spectroscopy
    x rays

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Electronic structure of Li<inf>1+</inf><inf>x</inf>[Mn<inf>0.5</inf>Ni<inf>0.5</inf>]<inf>1-</inf><inf>x</inf>O<inf>2</inf> studied by photoemission and x-ray absorption spectroscopy. / Yokoyama, Y.; Ootsuki, D.; Sugimoto, T.; Wadati, H.; Okabayashi, J.; Yang, Xu; Du, Fei; Chen, Gang; Mizokawa, Takashi.

    In: Applied Physics Letters, Vol. 107, No. 3, 033903, 20.07.2015.

    Research output: Contribution to journalArticle

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    title = "Electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 studied by photoemission and x-ray absorption spectroscopy",
    abstract = "We have studied the electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn3+ component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn3+ ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn3+ component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn3+.",
    author = "Y. Yokoyama and D. Ootsuki and T. Sugimoto and H. Wadati and J. Okabayashi and Xu Yang and Fei Du and Gang Chen and Takashi Mizokawa",
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    T1 - Electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 studied by photoemission and x-ray absorption spectroscopy

    AU - Yokoyama, Y.

    AU - Ootsuki, D.

    AU - Sugimoto, T.

    AU - Wadati, H.

    AU - Okabayashi, J.

    AU - Yang, Xu

    AU - Du, Fei

    AU - Chen, Gang

    AU - Mizokawa, Takashi

    PY - 2015/7/20

    Y1 - 2015/7/20

    N2 - We have studied the electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn3+ component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn3+ ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn3+ component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn3+.

    AB - We have studied the electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn3+ component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn3+ ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn3+ component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn3+.

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