CURRENT-DENSITY AND ZNO PRECIPITATION-DISSOLUTION DISTRIBUTIONS IN ZN-ZNO POROUS-ELECTRODES AND THEIR EFFECT ON MATERIAL REDISTRIBUTION - A 2-DIMENSIONAL MATHEMATICAL-MODEL

A two-dimensional mathematical model of the Zn-ZnO porous electrode has been developed. The model calculates electrode and electrolyte potentials, current density distribution, electrolyte concentrations, and Zn and ZnO distributions. The primary assumptions are a uniform-composition counterelectrode, a constant potential along the boundary separating the Zn-ZnO electrode from the counterelectrode, no convective flow, and an infinite electronic-matrix conductivity. The model predicts movement of the active material from the center of the electrode toward the edge of the electrode. © 1990, The Electrochemical Society, Inc. All rights reserved.