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.
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