By Jim Sullivan
In colour and black and white pictures
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2 Summary A test pack of cells that was part of a stress test at NASA MSFC experienced an abbreviated cycle life prior to failure caused by the inability to deliver 65% of the nameplate capacity. Two cells from this test pack were made available to Aerospace for examination. One of the cells was checked to verify its low capacity and also checked for internal short circuits. When our results were found to be in agreement with the results obtained at NASA MSFC, the cell was opened and put through the standard set of destructive physical analyses.
It has been found that the bending strength of these electrodes increases abruptly when the active material expands to the point that it pushes against the walls of the pores within the electrodes. Under certain cycling conditions, this pressure can cause the electrodes to grow in thickness and ultimately reduce the cycle life of the cells. A full report of these studies was presented at the 1998 NASA Battery Workshop. 26 Expansion of the electrodes is attributed to the very low density of one of the crystalline phases that results when cells are discharged after being overcharged.
65 g/cm 3 void. This can be converted to grams per square centimeter based on the porosity values of dry powder plaque material. By comparing the "original" theoretical capacity with the values determined from the chemical analyses, one can calculate the amount of extra active material. This value was found to agree to within 1% or 2% with the amount to be expected from the corrosion estimated from the pressure rise during cycling. In this example, the utilization of active material (both the original material that contains cobalt and also the non-cobalt-containing material resulting from corrosion of the nickel substrate) remains relatively high.