A MATHEMATICAL-MODEL FOR THE CYCLE OF HYDRIDE ELECTRODES

In this paper, a mathematical model for the cycling electrochemical ca pacity of hydride electrodes was deduced on the basis of activation an d degradation of hydride materials. A cycle life model was deduced on introducing the activation and degradation factors into the electroche mical polarization equation which included concentration polarization, phase transformation polarization and electrochemical polarization. E xperimental data on the TiNi hydride electrode were in good agreement with the deduced model. From this model, various factors affecting the cycle life were identified and the methods to enhance the cycle life were suggested.