Model for the impedance analysis in a three electrode solid state electrochemical cell

A T-network model for the determination of the electrode impedances in a three electrode solid state electrochemical cell is postulated and discussed. The model is applied to a Li solid battery where the electrolyte is the polymer (PEO)₈LiCF₃SO₃ and the positive electrode is the insertion electrode V₆O_{13 + x}. The Li metal reference electrode is found to have an impedance considerably greater than that of the working (V₆O₁₃ + x) or the counter electrode (Li). The significance of these impedances is discussed in relation to the geometry and construction of solid electrolyte cells, and to their suitability for potentiostatic measurements.