Accession Number:

ADA026551

Title:

Engineering Analysis of Shape Change in Zinc Secondary Electrodes.

Descriptive Note:

Final rept. Nov 73-Nov 75,

Corporate Author:

CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s):

• Choi,King Wai
• Hamby,Drannan
• Bennion,Douglas N.
• Newman,John

Report Date:

1976-03-01

Pagination or Media Count:

133.0

Abstract:

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

Descriptors:

• *SHAPE
• *ELECTRODES
• *ZINC
• *SILVER ZINC BATTERIES
• COMPUTER PROGRAMS
• MATHEMATICAL MODELS
• LIFE EXPECTANCY(SERVICE LIFE)
• CONVECTION
• ZINC OXIDES
• STORAGE BATTERIES
• MEMBRANES
• FLOW
• HYDRODYNAMICS
• HYDROXIDES
• POTASSIUM COMPOUNDS
• BATTERY SEPARATORS

Subject Categories:

• Electrochemical Energy Storage

Distribution Statement:

APPROVED FOR PUBLIC RELEASE