Electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 studied by photoemission and x-ray absorption spectroscopy

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

doi:10.1063/1.4927239

Electronic structure of Li₁₊_x[Mn_0.5Ni_0.5]_1-_xO₂ studied by photoemission and x-ray absorption spectroscopy

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We have studied the electronic structure of Li₁₊_x[Mn_0.5Ni_0.5]_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⁺.

Original language	English
Article number	033903
Journal	Applied Physics Letters
Volume	107
Issue number	3
DOIs	https://doi.org/10.1063/1.4927239
Publication status	Published - 2015 Jul 20

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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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 T. 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, T.

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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Electronic structure of Li₁₊_x[Mn_0.5Ni_0.5]_1-_xO₂ studied by photoemission and x-ray absorption spectroscopy

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