SEPARATORS FOR HIGH-RATE, NON-RESERVE ZINC-SILVER OXIDE BATTERIES
Semiannual rept. no. 1, 20 Feb-Jul 1967
DOUGLAS AIRCRAFT CO INC NEWPORT BEACH CA ASTROPOWER LAB
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Separator materials were evaluated for use in high rate, nonreserve zinc-silver oxide batteries capable of operation at temperatures as high as 165F. The films were obtained by blending an inorganic material previously used to make separators for secondary silver-zinc cells with an organic binder. Two basic materials designated 3355-25 and 3420-09 were selected to make separators and were evaluated for resistivity, inertness in KOH at 77F and at 165F, silver and zinc diffusion rates, resistance to oxidation by silver saturated KOH solution. Although both materials showed close characteristics, the material 3420-09 was selected for its greater stability in KOH at 165F. For blending, two types of organic binders, K and P, and three procedures were USED the film was cast on glass or Teflon a slurry was introduced in a porous thin matrix the silver electrode was dipped in the liquid formulation, resulting in a dip-coated electrode. The results favored the binder P as more stable. The resistivities of the most promising films were in the range of 7 to 15 ohm-cm and the silver ion diffusion rates were lower than those obtained with the inorganic separators on the previous task. A few cells with dip-coated electrodes tested at room temperature maintained an OCV of 1.86 V after 31 days to date.
- Electrochemical Energy Storage