By Dana Bell
Air strength shades Vol 1: 1926-42
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Additional resources for Air Force Colors 1926-1942
On a yearly basis for the Air-Force-supported cycling at Crane, and on a less frequent basis for the NASA Space Station cycling, the staff at Crane prepared extensive reports covering the historical trends of temperature, pressure, voltage, and recharge ratios (RR) for each test pack undergoing testing. In the Aerospace review of the failures that were listed for the 70 test packs cycled under these sponsors, 23 different packs reached their failure criteria. These tests were cycled at different temperatures and DODs.
In all cases, electrodes that did not evidence excessive swelling or damage were selected for this test. 6 X-ray Analysis of Discharged Active Material Samples of active material from each of the segments were then submitted for xray analysis. 3). That material was identified via xray analysis as nickel oxide-hydroxide. The x-ray analysis from each of the four segments did not reveal any of the deactivated form of nickel hydroxide that was seen earlier. 0, but was not dischargeable. 7 Other Tests and Examinations Following the testing reported above, samples were submitted for several other analyses and tests, including scanning electron microscopy (SEM), elemental dispersion analysis using x rays (EDAX), optical photomicroscopy, electrochemical voltage spectroscopy (EVS), thermogravimetric analysis (TGA), and further chemical analysis.
1 . 0 . . . . 5 Potential vs. 6 Fig. 4. Electrochemical voltage spectroscopy trace on a sample of used plate material. 3 Unusual F o r m of Capacity D e g r a d a t i o n on Cell Cycled to 65 % D O D DPA studies of a failed cell revealed a form of capacity degradation that had not been identified before. The cell (manufactured by EaglePicher in Joplin), which was part of an accelerated life cycle test, had failed after about 1200 cycles at 65% DOD because of low end-of-discharge voltage.