SILVER-ZINC SECONDARY BATTERY INVESTIGATION.
Abstract
One percent palladium added to the silver positive plate appreciably increases cycle life, maintains the monovalent charge capacity for 500 to 1000 cycles, and tends to reduce silver migration through separators. Thirty-five hundred cycles were attained by 25 a.h. cells at 25% depth of discharge containing 1% palladium impregnated positive plates. Silver particle sizes studied in the micron range of greater than 1 to 12 do not appreciably affect voltage, capacity, or cycle life of silver plates. Low current density operation and high alkali concentration (45%) tend to yield maximum cycle life performance. The use of polyvinyl alcohol as a binder material in the negative active material increases negative plate life. Increasing Hg content of the negative plate active material and increasing KOH concentration both result in marked reduction in rates of hydrogen generation on stand in the temperature range 75 to 125 F. Increasing HgO content results in decreased cycle life. Two batteries containing 1%-palladium coated silver were cycle life tested. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1963
- Accession Number
- AD0422077
Entities
People
- J. A. Keralla
- J. J. Lander
Organizations
- General Motors