Considering the very different trends in the N1s and F1s peaks, the OTFSI+Li peak must contain contributions from rather stable adsorbed species, which are different from coadsorbed TFSI and Li, but where the local environment of the O atoms closely resembles that in TFSI. The lower-BE OTFSI,dec-1 (blue-yellow) and O-TFSI,dec-2 (yellow) peaks even grew in in intensity up to 650 K annealing, indicating that they result from decomposition of the TFSI-like species, and that increase of these fragments due to decomposition of TFSI-like species can even overcompensate possible losses due to desorption. Only upon annealing to 650 K, the OTFSI,dec-1 peak loses in intensity, while the OTFSI,dec-2 peak continues to grow. Hence, the adsorbed Li2Olike species reflected by the latter peak (see above) seems to be stable up to 650 K.