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Title: Electronic structure of Li{sub 1+x}[Mn{sub 0.5}Ni{sub 0.5}]{sub 1−x}O{sub 2} studied by photoemission and x-ray absorption spectroscopy

We have studied the electronic structure of Li{sub 1+x}[Mn{sub 0.5}Ni{sub 0.5}]{sub 1−x}O{sub 2} (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+} 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+} ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn{sup 3+} 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+}.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ; ; ;  [6] ;  [7]
  1. Department of Physics, University of Tokyo, Chiba 277-8561 (Japan)
  2. (Japan)
  3. Department of Complexity Science and Engineering, University of Tokyo, Chiba 277-8561 (Japan)
  4. Institute for Solid State Physics, University of Tokyo, Chiba 277-8581 (Japan)
  5. Research Center for Spectrochemistry, University of Tokyo, Tokyo 113-0033 (Japan)
  6. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012 (China)
  7. Department of Applied Physics, Waseda University, Tokyo 169-8555 (Japan)
Publication Date:
OSTI Identifier:
22486359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; CATHODES; ELECTRONIC STRUCTURE; JAHN-TELLER EFFECT; LITHIUM ION BATTERIES; MANGANESE IONS; PHOTOEMISSION; SENSITIVITY; VALENCE; X RADIATION; X-RAY SPECTROSCOPY