The nickel electrode has been identified as the life limiting component for individual pressure vessel (IPV) nickel-hydrogen cells when cycled under a low earth orbit (LEO) cycle regime at deep depths of discharge. As a part of an overall program to develop a long life nickel elektrode for nickel-hydrogen cells, the effect of two different methods of electrochemcial impregnation on the cycle life of the nickel electrode was investigated. One method was the Pickett (acqueous/ethanolic) process. The other was the modified Bell (aqueous) process. The plaques for both impregnation methods were made by sintering dry carbonyl nickel powder in a reducing atmosphere. The plaques contain a nickel screen substrate. Electrodes made from both processes were cycle tested in Air Force design IPV nickel-hydrogen cells. The only factors different for this test was the method of plaque impregnation; all other factors were the same. The cells were cycled to failure under a 90 min LEO cycle regime at a deep depth of discharge (80 percent DOD). Failure for this test was defined to occur when the cell voltage degraded to 1.0 V prior to the completion of the 35 min discharge.
Effect of impregnation method on cycle life of the nickel electrode
Einfluss der Impraegnierungsmethode auf die Zykluslebensdauer der Nickel-Elektrode
1986
5 Seiten, 6 Bilder, 1 Tabelle, 9 Quellen
Conference paper
English
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