“…Taken these facts into consideration, a close, functional and mechanically resistant SEI-layer is a precondition for the successful application of this promising active material in commercial products [1][2][3]. In the course of presented work the chemical structure of passivation films, formed under reductive conditions on silicon and (for reference purposes) graphite anodes [4] by EC/DEC and FEC-based electrolytes were studied using Pyrolysis-GC/MS and HATR/FTIR.…”