Effect of impregnation method on cycle life of the nickel electrode
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 electrode for nickel-hydrogen cells, the effect of two different methods of electrochemical impregnation on the cycle life of the nickel electrode was investigated. One method was the Pickett (aqueous/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 factor 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.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 7173001
- Report Number(s):
- N-86-31980; NASA-TM-87326; E-3037; NAS-1.15:87326; CONF-860810-43
- Resource Relation:
- Conference: Intersociety energy conversion engineering conference, San Diego, CA, USA, 25 Aug 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRODES
MATERIALS
NICKEL-HYDROGEN BATTERIES
ELECTROCHEMISTRY
FAILURES
SERVICE LIFE
SPACECRAFT POWER SUPPLIES
TESTING
CHEMISTRY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRONIC EQUIPMENT
EQUIPMENT
METAL-GAS BATTERIES
POWER SUPPLIES
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries