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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Takamatsu et al. (2012) studied this question.
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