This work aim is an efficient modelling proposal for supercapacitors made of activated carbon electrodes which are power components used in many energy storage applications. In the first part of this study, the purpose is to evidence physico-chemical phenomena, electrostatic or electrochemical as well, thanks to characterization and aging tests. The results analysis combined with materials knowledge leads to suppose that the supercapacitor non linear behavior is due to adsorption-desorption processes and also to anomalous diffusion of adsorbed species into the electrode microporous network. These mechanisms in addition with the double layer capacitor principle allow us to define a non linear fractional model with parameters that depend on physico-chemical characteristics of the cell. The proposed identification procedure is based on the voltage response to chargesdischarge current profiles. In spite of the simplicity of this identification method, the model matches very well the behavior of the supercapacitor under current profiles that are typical of hybrid and electric vehicle applications.
