Characterization of the passivation layer at the polymer electrolyte/lithium electrode interface

This work investigates the formation of a passivation layer at the lithium/ poly(ethylene oxide)-lithium triflate electrolyte interface using attenuate d total reflection FTIR spectroscopy, atomic force microscopy (AFM) and a.c . impedance spectroscopy. Self-assembled molecular layer technology was use d to generate interfaces having no passivation layer so that comparisons co uld be made between passivated and non-passivated surfaces. AFM data show t he formation of a passivation layer composed of what appears to be crystall ites and ATR-FTIR data indicate the presence of CF, radicals in this passiv ation layer with possible polymer chain scission. The formation of Li-O-R c ompounds is also observed, (C) 2000 Elsevier Science B.V. All rights reserv ed.