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Effect of Cobalt Additive, KOH Concentrations, and Types of Nickel Electrodes on Storage Behavior of Nickel-Hydrogen Cells
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English
Abstract
Open circuit storage tests of discharged Ni/H2 cells have been carried out at 20°C to understand effects of cell design parameters on capacity fading with storage and determine capacity fading mechanism. Cell design parameters studied include variations in the electrode substrate (dry powder or wet slurry sinter), active material impregnation technique (alcoholic or aqueous bath), cobalt additive concentrations (4 to 10%), KOH concentration (26 or 31%), and cell precharge (nickel or H2). Precharge had the most dominant effect of all parameters. When cells had nickel precharge, virtually no fading was observed with storage up to 188 days, while gradual fading was observed with all H2 precharged cells. Tendency of capacity fading of these cells depended on KOH concentration, impregnation technique, and cobalt concentration. Cell pressure changes with storage were consistent with build-up of electrochemically undischargeable active material with capacity fading. Overcharging at low temperature (0°C) was effective in partial recovery of capacity but low-earth-orbit cycling had a minimal effect.
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Citation
Lim, H., "Effect of Cobalt Additive, KOH Concentrations, and Types of Nickel Electrodes on Storage Behavior of Nickel-Hydrogen Cells," SAE Technical Paper 929110, 1992, https://doi.org/10.4271/929110.Also In
References
- Lim H. S. Stadnick S. J. “Effect of precharge on Ni/H 2 cell storage capacity,” J. Power Sources 27 69 1989
- Lim H. S. Verzwyvelt S. A. “Effects of Electrodes and Cell Design Variables on Capacity Fading of a Ni/H 2 Cell on Storage” Proc. 25th Intersociety Energy Conversion Engineering Conference Aug. 1990 3 7
- Zimmerman A. H. The Electrochemical Society Fall Meeting Hollywood, Florida October 15-20 1989
- Lim H. S. Verzwyvelt S. A. “Electrochemical Behavior of Heavily Cycled Nickel Electrodes in Ni/H 2 Cells Containing Electrolytes of Various KOH Concentrations” The Electrochemical Society Fall Meeting Hollywood, Florida October 15-20 1989