Deconvolution of the main peak, which is centered at around 532.5 eV, resolves two components, one at 533.0 eV (OTFSI+Li, cyan) and one at 532.0 eV (OTFSI,dec-1, blue-yellow). The OTFSI,dec-1 component is likely related to a molecular decomposition product of TFSI, while the peak at around 530 eV is most likely due to an adsorbed inorganic compound such as Li2O. .