By L. Thaller, A. Zimmerman
The overview and research said listed below are the results of a undertaking conducted from 1998-2001 in the strength expertise division of the The Aerospace company to ascertain the on hand result of diverse nickel-hydrogen existence checking out courses that were or have been being performed for low Earth orbit (LEO) functions. The biking courses, a few of that are nonetheless in development, have been carried out below diverse sponsorships and conducted at varied trying out facilities.
- facts and knowledge showing during this publication are for informational reasons in simple terms. AIAA and the writer should not accountable for any damage or harm because of use or reliance, nor do AIAA and the writer warrant that use or reliance could be loose from privately owned rights.
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Additional info for Nickel-Hydrogen Life Cycle Testing - Review and Analysis
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.