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

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1 Citation (Scopus)

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+.

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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