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The positive attributes of X-ray photoelectron spectroscopy to the field of battery research is illustrated through the study of reaction mechanisms involved during the electrochemical reduction/oxidation of a metal oxide (MO) electrode vs Li. Through the acquisition and interpretation of various (Co 2p, Li 1s, O 1s, and C 1s) XPS spectra during the charge and discharge of a CoO/Li battery, we could confirm the reversibility of the CoO → Co conversion reaction process involving the reversible formation/decomposition of CoO and Li 2 O together with the reversible growth of an organic layer. More importantly, such measurements suggested that the organic polymer could contain, among others, oligomer chains of poly(ethylene oxide) (CH 2 CH 2 O) n .
Dedryvère et al. (Thu,) studied this question.