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First In Situ Observation of the LiCoO2 Electrode/Electrolyte Interface by Total-Reflection X-ray Absorption Spectroscopy


  • This work was supported by the “Research and Development Initiative for Scientific Innovation of New Generation Battery (RISING project)” of the New Energy and Industrial Technology Development Organization (NEDO; Japan). The synchrotron radiation experiments were performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI; proposal numbers 2009B1027, 2010A1015, 2010A1016, 2010B1029, 2011A1012, 2011B1022, 2011B1023, and 2011B1037).


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Surface analysis: In situ total-reflection fluorescence X-ray absorption spectroscopy showed that reduction of cobalt at the surface of a LiCoO2 electrode occurs by contact with a liquid electrolyte. An irreversible behavior was observed at the surface of LiCoO2 during a first charge/discharge process whereas the bulk material showed a reversible behavior. This Co reduction is an initial electrode deterioration.

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