For the S2p region, the high-BE STFSI+Li peak (cyan), which is related to adsorbed TFSI-like species, loses some intensity upon annealing to 400 K, but much less than, e.g., the NTFSI+Li peak. Obviously, similar to the OTFSI+Li (blue-yellow) peak, this signal contains contributions from adsorbed molecular fragments with rather similar local environment of the S atoms as in TFSI, which appear at essentially the same BE, but is more stable than coadsorbed, interacting TFSI and Li. Another fragment, represented by the STFSI,dec-1 peak, changes little upon annealing to 400 K. Correspondingly, also the decomposition product represented by the STFSI,dec-2 peak, increases little in coverage. Further annealing to 450 and 500 K results in a slight loss of intensity in the molecular species represented by the STFSI+Li (cyan) and STFSI,dec-1 (blue-yellow) peaks, with a corresponding growth of the STFSI,dec-2 peak. Even after annealing to 650 K, however, the higher-BE peaks have not completely disappeared, while the low BE-STFSI,dec-2 peak increased further, though this could not fully compensate for the intensity loss in the higher-BE peaks. Hence, thermal decomposition of the molecular fragments in the STFSI,dec-1 peak results partly in stable binary compound species, most likely adsorbed Li2S-like species, while another part leads to volatile species that desorb during annealing.