Engineering Analysis of Shape Change in Zinc Secondary Electrodes II . Experimental

Experimental data on zinc--silver oxide secondary cells were used to evaluate the convective flow hypothesis on the cause of shape change of zinc electrodes. A cell with flooded, vented electrodes designed to allow ''normal'' convective flow was studied. Zinc electrodes cycled in this cell showed extensive material redistribution in accord with predictions based on the hypothesis. Measured volume average fluid flow rates for this cell were also in agreement with predicted values. Zinc electrodes cycled in a second cell, designed to minimize convective flow in the zinc electrode compartment, showed virtually no active material redistribution. (8 figures)