The volume tolerance characteristics of a nickel-hydrogen cell were evaluated by altering the volume of electrolyte within the cell's components. This was done by evaporating increments of water from a cell and evaluating the cell's performance following each removal. The cell selected for this investigation was one that was sensitive to electrolyte volume reductions due to having only one layer of zircar separator. Two complete charge/discharge cycles were carried out ...
An investigation was carried out in an attempt to explain the out-of- family voltage trace associated with one of the 250 A-h lithium thionyl chloride cells used in batteries for selected Centaur missions. The voltage trace was generated during the manufacturing step where electrolyte is added to the cell. The investigation was carried out in several steps. First, discussions were held with the manufacturer, who was able to suggest theories ...
The porosity distributions of sinter plaques manufactured by dry powder and wet slurry processes were measured using an improved conductive imaging microprobe. This study has indicated that the pore size distributions of dry-powder plaques are more uniform than those of the slurry-coated plaques. For the slurry process, porosity distribution depends on many variables (such as slurry viscosity and density, sinter temperature, and processing speed), and the pore size distribution can ...
The destructive physical analysis (DPA) of electrochemical devices is an important part of the overall test. Specific tests have been developed to investigate the degradation mode or the failure mechanism that surfaces during the course of a cell being assembled, acceptance tested, and lifecycle tested. The tests that have been developed are peculiar to the cell chemistry under investigation. Tests are often developed by an individual or group of researchers ...
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