DEVELOPMENT OF THE SEALED ZINC-SILVER OXIDE SECONDARY BATTERY SYSTEM.
Quarterly progress rept. no. 7, 1 Jan-31 Mar 65,
YARDNEY ELECTRIC CORP NEW YORK
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The use of an unfiltered power supply for charging increased capacity in comparison with a straight D. C. charge, particularly at high charge rates. Evaluation cycle data are presented for 32 cells from a factorial experiment which evaluates 7 separators, 2 KOH concentrations, 4 concentrations of Teflon binder, 3 ZnAg ratios and the effect of a negative interseparator. Poor results were obtained with various PVA and Borden methyl cellulose separators, particularly in 26.5 KOH. Finally, the rate of oxygen recombination was lowered by increasing the Teflon content in the negative and by decreasing the ZnAg ratio. Evaluation cycles and an overcharge test were run on 16 cells designed to determine the effect of surfactant additions to the negative and the effect of zinc penetration resistant separators on cell performance. Preliminary results indicate no loss of capacity with these additions. Initial results with cells built with RAI2.2XH separator indicate good capacity and voltage. Oxygen recombination however, was low due to a lack of free space in the cell. Author