Comparison with the monolayer spectra in Figure shows that the low BE peak at about 530.0 eV is much more pronounced in the monolayer system, indicating that Li2O formation is more facile in that case. This peak, which due to the Li-induced up-shift of the TFSI-related peaks in the monolayer system is also better separated in the monolayer spectra, disappears at higher annealing temperatures, while in the monolayer spectra it remains up to 650 K annealing, the highest temperature in those measurements. Furthermore, also the intensity ratio of the two components in the higher-BE peak (OTFSI+Li (cyan), OTFSI, dec-1 (blue-yellow) seems to be different in the multilayer than in the monolayer spectra upon annealing, with a lower relative intensity in the OTFSI+Li component (cyan) than in the OTFSI-dec1 component (blueyellow). On the other hand, similar to the monolayer spectra in Figure , the intensity loss in the higher-BE peak (OTFSI+Li and OTFSI,dec-1) occurs mostly upon 650 K annealing. Hence, the direct interaction with the graphite substrate does not seem to stabilize the fragments against (reactive) desorption.