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| - A Study of the Mechanism of the Electrochemical Reaction of Lithium with CoO byTwo-Dimensional Soft X-ray Absorption Spectroscopy (2D XAS), 2D Raman, and 2DHeterospectral XAS−Raman Correlation Analysis
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| - To investigate the mechanism of the electrochemical insertion of lithium into the CoO electrode in a Li/LiyCoO cell, we applied a two-dimensional (2D) correlation analysis to the spectra of the LiyCoO system duringthe first insertion−extraction reaction as obtained by lithium concentration-dependent X-ray absorptionspectroscopy (XAS) and Raman spectroscopy. 2D XAS and 2D Raman spectra yield great resolutionenhancement and show that the insertion of lithium into the CoO electrode leads to Li2O formation. Moreover,by analyzing the sign of the asynchronous cross peaks, we reveal the sequence of the first insertion process: first, the intensity of the band due to CoO decreases and then that of the band due to Li2O increases. A 2Dheterospectral XAS−Raman correlation analysis was also undertaken of the same XAS and Raman spectra.This heterospectral 2D correlation analysis has elucidated not only the sequence of events between XAS andRaman signals from the same species but also the correlation between the XAS and Raman bands, confirmingtheir band assignments.
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