Characterization of lithium and electrolytes by electrochemical impedance spectroscopy

The electrochemical behaviour of lithium has been tested by d.c. and a.c. measurements in propylene carbonate and mixtures with 1,3-dioxolane and 1,2-dimethoxyethane using LiClO4 and LiCF3SO3 as electrolytes. The solvent and the anion of the lithium salt have an influence on the properties of the formed surface layer. This influence is obvious in a change of the layer thickness, the exchange-current density, the charge-transfer resistance and the maximum frequency of the charge-transfer arc.