Characterisation of the electrode/electrolyte interfaces in cells of the type Li/PEOLiCF₃SO₃/V₆O₁₃ by ac impedance methods

A combination of ac impedance methods and 3-electrode cells were employed to study separately the V₆O₁₃ and lithium interface with, solid, high molecular weight PEO (5 × 10⁶), and liquid, methoxy end-caped low molecular weight PEO (222). Surface layers appear to be present on both electrodes. Generally both the lithium and V₆O₁₃ interfacial impedances develop until they are significantly larger than the bulk electrolyte resistance. © 1989.