Changes in the C1s spectra upon Li post-deposition and annealing can be summarized as follows: Deposition of 3.6 ML Li induces already a significant intensity loss in the CTFSI (cyan) peak, while during subsequent annealing up to 500 K this peak at around 293 eV (CTFSI+Li, cyan) is about stable, both in intensity and in BE. It disappears only upon annealing to 650 K. The CC-C (red) peak at about 286 eV is largely stable up to 450 K, it loses much of its intensity upon annealing to 500 K. Also these species are no longer detectable upon annealing to 650 K. At this point, evaluation of the CC-C peak is hindered also by the strongly increasing graphite related signal (284.6 eV, grey), due to desorption of much of the multilayer and its decomposition products. The same trend is observed also for the CC-N peak at 287.6 eV (light red). Hence, after annealing most of the C-containing decomposition products of BMP-TFSI and Li have desorbed. Remaining quantities are below the detection limit given by the broad signal of graphite and the related satellite (290.8 eV).