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The electrochemical behaviour of the cathode/electrolyte interface which is formed between screen printed Lq~,8Sro,2MN03-cathode and ZrO2+8%YZO3 electrolyte was investigated. The impedance of the cathode/electrolyte interface was calculated as a function of (I) the oxygen exchange velocity between cathode material and atmosphere, (11) interface microstructure and (111) the oxygen vacancies diffusion coefficient. A very good agreement between calculated and measured impedance spectra was achieved. The influence of the porosity of the cathode on the impedance is discussed.