Further identification to the SEI film on Ag electrode in lithium batteries by surface enhanced Raman scattering (SERS)

The surface enhanced Raman scattering (SERS) spectrum of the solid electrolyte interphase (SEI) film on the Ag electrode discharged to 0.0 V in lithium battery was measured by normal Raman spectrometer at different excited wavelength. Compared with the Raman spectra of pure LiOH·H2O and Li2CO3 reagents, all the SERS bands of the SEI film formed on the surface of the Ag electrode can be assigned to Li2CO3 and LiOH·H2O, which are the main stable components of the SEI film in the presence of trace water. LiF may be another possible stable component, however, it cannot be detected due to its inactivity in Raman spectrum.