Electrochemical characterization of plasticized polymer electrolytes basedon ABS/PMMA blends

Electrochemical characteristics of plasticized polymer electrolytes based o n poly(acrylonitrile-butadene-styrene) and poly(methyl methacrylate) (abbre viated as ABS/PMMA) blends have been studied. The ionic conductivity of the polymer electrolyte with an ABS/PMMA ratio of 6/4 and a plasticizer conten t of 60% was highest when the LiClO4 content was 4.8%. The transference num bers (T+) of the polymer electrolytes were measured using the steady-state current method, and the T+ values were found to be less than 0.5. The elect rolyte system was found to have an electrochemical stability window up to 4 .5 V. The properties of the electrode interface in contact with the polymer electrolyte were also investigated by impedance spectroscopy, and the evol ution of these spectra as a function of storage time was explained and inte rpreted using a solid-polymer layer (SPL) model. The time evolution of the impedance parameters indicated that a passivation film grew rapidly on the lithium surface immediately after assembly of the cell.