Interphase chemistry of Si electrodes used as anodes in Li-ion batteries

► XPS and ToF-SIMS study of solid electrolyte interphase layer on Si thin film and Si nanowires electrodes is presented. ► Modification of Si electrode surface morphology is evidenced by SEM micrographs. ► Organic part of solid electrolyte interphase is present at the outer- and inorganic part in the innermost surface. ► Different thickness of solid electrolyte interphase is observed in a function of type of electrolytes.