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We develop a mathematical model for analyzing the discharge performance of a thick porous metal-hydride electrode. A numerical solution method together with partial analytic solutions is presented. The potential loss in the electrode is divided into parts corresponding to the different loss mechanisms, and an averaging method is used for an easy interpretation. The model is applied to simulate a continuous discharge, an interrupted discharge, and the effect of varying the values of certain parameters.

We investigate the effect of particle size on the discharge performance of a nickel-metal hydride cell with a mathematical model. Electrodes with uniform as well as with nonuniform particle sizes are studied. With uniform particle size, the dependence of the particle-to-particle resistance on the particle size is taken into account. The optimal particle size depends on the discharge rate. Moreover, we show that under certain conditions it is advantageous to use a nonuniform particle size. In general, the higher the discharge current density, the more the particle size affects the electrode performance. IntroductionIn this article we study the effect of particle size on the discharge performance of a nickel-metal hydride cell. We use a mathematical model to describe the behavior of the metal hydride (MH) electrode in constant-current discharge and perform numerical simulations for various particle sizes.Normally, when a ME electrode is cycled, the particle size