In the following, we will, after a brief description of the experimental and computational procedures in section 2, first present and discuss XP spectra recorded on the graphite (0001) surface after deposition of a BMP-TFSI monolayer film at room temperature, after subsequent deposition of 0.7 and (in total) 1.4 monolayers (ML) of Li and after different annealing steps up to 650 K (section 3.1.1). This is followed by comparable spectra recorded on a thick multilayer film of BMP-TFSI, including annealing steps up to 700 K (section 3.1.2). Different from the monolayer case, this results in a direct interaction of Li 0 species with bulk BMP-TFSI, without preceding adsorption on the graphite (0001) substrate. Hence, a possible charge transfer is only possible to BMP-TFSI, in contrast to the monolayer case, where charge can be transferred to the graphite (0001) substrate. It should be noted that the high temperatures limits are close to the temperatures reported for thermal decomposition of neat BMP-TFSI or of 0.7 M solutions of Li-TFSI in BMP-TFSI of 650 -700 K Subsequently, we present and discuss the results of calculations determining the structure and electronic properties of adsorbed Li, adsorbed BMP-TFSI, coadsorbed BMP-TFSI and 1 or 3 Li on graphite (0001), complemented by a similar calculation of a free-standing BMP-TFSI layer (section 3.2.1). For these calculations we used the unit cell that had been derived earlier for a saturated monolayer of BMP-TFSI on graphite (0001). This includes also calculations of the changes in work function induced by the respective (co-)adsorbed species. In the next section (section 3.2.2), we present calculations of different adlayer structures resulting from coadsorption of Li and BMP-TFSI and from the initial reaction between these species. In addition to the structures and reaction energies, this includes also calculated binding energies of characteristic core level states of the different elements in these adsorbed species. These initial reactions can be considered as the first step in a chemical SEI formation. Finally, we show comparable results (stable structure, energy and core level BEs) for binary adsorbed species that correspond to the binary Li containing species such as LiF, Li2O or Li2S. In analogy to the above initial reaction products, these binary compounds can be considered as a last step in the reaction sequence describing chemical SEI formation. This section is followed by a brief discussion of the relevance of results obtained for such kind of idealized model systems and under idealized reaction conditions for the understanding of SEI formation on realistic systems, and of further improvements in the XPS analysis of complex surfaces such as the SEI layer (section 3.3). Finally, we summarize the main findings of this study (section 4).