Some nickel-iron, and nickel-metal hydride, cell cycling results
- SRI International, Menlo Park, CA (United States)
- Weaver Consulting, Palo Alto, CA (United States)
Some cycling experiments were performed on two kinds of cells: Nickel-Iron and Nickel-Metal-Hydride. A nominal 200 Ampere-hour Nickel-Iron battery was obtained from Eagle-Picher, Inc. and its initial capacity was determined by cycling at the manufacturer`s recommended regime. A single cell was removed from the battery and placed in a cell case designed to provide for quantitative assay of all gases evolved. After determining that no change in ampere-hour capacity of the cell had occurred as a result of the handling of the cell, the cell capacity was reduced to 15 ampere-hours in a negative-positive-negative configuration by removal of plates and by cutting the remaining plates to approximately one-half the original area. The resultant cell displayed the calculated capacity. At this time the charging regime was changed to include high rate DC, up to 6 C, and various forms of non-DC charging, again at high rates. During these experiments, careful assay of the instantaneous quantities of hydrogen and oxygen were performed using gas chromatography. No significant effects of kinds of charging currents upon quantities of gases evolved were found. Very difficult-to-interpret results representing the quantity of gas evolved as a function of state of charge were observed. The well-known ruggedness of the Edison couple was observed during the study which subjected the cell to three year`s worth of time and many non-standard and otherwise abusive charging conditions; the capacity of the cell did not change during all of this. Some Nickel-Metal-Hydride cells were subjected to cycling experiments. The cells were of generic manufacture intended for use in lap-top computers; the capacity was at the 2 ampere-hour level. Pressure versus state-of-charge results at various temperatures are presented.
- OSTI ID:
- 69727
- Report Number(s):
- CONF-950121--; ISBN 0-7803-2459-5
- Country of Publication:
- United States
- Language:
- English
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