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Engineering Analysis of Shape Change in Zinc Secondary Electrodes.
Final rept. Nov 73-Nov 75,
CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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Shape change, the redistribution of active material over the zinc electrode surface as a result of cell cycling, is hypothesized to be caused by convective flows driven primarily by membrane pumping. A mathematical model is formulated based on the convective flow hypothesis for the zinc-silver oxide secondary cell and tested by actual cell experiments. The numerical solutions predict redistributions of zinc material over the zinc electrode, fluid flow rates, variations of current distribution, and cell potential with the number of cycles. These numerical calculations are compared quantitatively to the experimental observations. The results show that shape change can be eliminated if the convective flow in the zinc electrode compartment parallel to the electrode surface is stopped. Author
APPROVED FOR PUBLIC RELEASE