Modeling Performance Degradation in Nickel Hydrogen Cells
AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
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With the increasing use of nickel hydrogen cells and batteries, degradation models and cycle life predictions can be valuable if they are valid. This report reviews previous studies of the expansion characteristics of nickel electrodes, as well as early efforts to predict cycle life as a function of depth of discharge. The results of these earlier studies are then used to suggest a more accurate degradation model for nickel electrodes. Preliminary experimental studies have focused on electrodes of the type used in typical flight hardware. The objective is to explore the stiffness of electrodes as they are cycled to different depths of discharge and different concentrations of KOH. Electrodes of different plaque strengths, loading levels of active material, and amounts of cobalt additives will eventually be investigated. The ultimate goal is to more accurately predict the cycle life of a cell as affected by design parameters.
- Inorganic Chemistry
- Physical Chemistry
- Electrochemical Energy Storage