The ac impedance studies for porous MnO2 cathode by means of modified transmission line model

A simplified 5-RC transmission line equivalent circuit was introduced. Mang anese dioxide cathodes from three commercial, primary alkaline cells were i nvestigated by means of ac impedance technique. Cathode Ohmic resistance, F araday resistance for the reduction of MnO2, proton diffusion rate inside t he lattice of EMD and electrochemical accessible surface area were obtained by numerical fitting of impedance data using the simplified transmission l ine model. The kinetics for cathode surface accessibility was also studied. (C) 2001 Elsevier Science B.V. All rights reserved.