Electronic structure of Li2Fe1−xMnxP2O7 for lithium-ion battery studied by resonant photoemission spectroscopy

In order to clarify changes in the electronic structures, especially Fe partial density of states (DOS), of Li2Fe1−xMnxP2O7 with Mn substitution, we have performed x-ray absorption spectroscopy and resonant photoemission spectroscopy (RPES) experiments for Li2Fe1−xMnxP2O7. Using RPES teqniques, we h...

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Veröffentlicht in:Journal of physics. Conference series 2014-04, Vol.502 (1)
Hauptverfasser: Horiba, Koji, Ito, Shota, Kurosumi, Shodai, Nagamura, Naoka, Toyoda, Satoshi, Kumigashira, Hiroshi, Oshima, Masaharu, Furuta, Naoya, Nishimura, Shin-ichi, Yamada, Atsuo, Mizuno, Noritaka
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Sprache:eng
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Zusammenfassung:In order to clarify changes in the electronic structures, especially Fe partial density of states (DOS), of Li2Fe1−xMnxP2O7 with Mn substitution, we have performed x-ray absorption spectroscopy and resonant photoemission spectroscopy (RPES) experiments for Li2Fe1−xMnxP2O7. Using RPES teqniques, we have succeeded in extracting the Fe2+ partial DOS. We have found the systematic shift to higher binding energy and broadening of Fe 3d t2g down-spin states accompanying with the Mn substitution. The peak shift of the Fe 3d t2g down-spin states is matched very well to the change of Fe3+/Fe2+ redox potential, suggesting that the origin of high Fe3+/Fe2+ redox potential in Li2Fe1−xMnxP2O7 is the shift of the Fe 3d t2g down-spin states to the higher binding energy with Mn substitution.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/502/1/012004