Surface characterization of the high voltage LiCoO2/Li cell by X-ray photoelectron spectroscopy and 2D correlation analysis

In this study, we demonstrated the surface reaction in a LiCoO2/Li cell under high voltage condition and characterization of the composition and properties of electrode–electrolyte interface by 2D correlation analysis. 2D Raman correlation spectra revealed that the extraction of Li+ leads to the formation of surface components including Li2O and Co3O4 and structural distortion in hexagonal LiCoO2 structure.