Nanoscale observation of the electronic and local structures of LiCoO 2 thin film electrode by depth-resolved X-ray absorption spectroscopy

Daiko Takamatsu, Takayuki Nakatsutsumi, Shinichiro Mori, Yuki Orikasa, Masato Mogi, Hisao Yamashige, Kenji Sato, Takahiro Fujimoto, Yu Takanashi, Haruno Murayama, Masatsugu Oishi, Hajime Tanida, Tomoya Uruga, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi

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Abstract

The electronic and local structural changes during electrochemical delithiation processes occurring at the electrode/electrolyte interface of LiCoO2 thin film electrode prepared by pulsed laser deposition were clarified by using depth-resolved X-ray absorption spectroscopy technique. We successfully obtained detailed microstructural information around the Li 1-xCoO2 electrode surface with a depth resolution of ca. 3 nm using a spectro-electrochemical cell. Our results revealed a remarkable increase in the local distortions at the Li1-xCoO2 surface after charging, and the distortions extended to the bulk of Li 1-xCoO2. Such unprecedented local distortions might be attributable to the marked deterioration of the electrodes.

Original languageEnglish
Pages (from-to)2511-2514
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume2
Issue number20
DOIs
Publication statusPublished - Oct 20 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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