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NiH2 Cycle Life StudyCycle life studies have been performed at Eagle Picher Technologies (EPT), on HST Mantech design cells with various pedigrees of slurry and dry sinter processed electrodes, to evaluate peak load voltage performance during generic load profile testing. These tests provide information for determining voltage and capacity fade (degradation) mechanisms, and their impact on nickel hydrogen cell cycle life. Comparison of peak load voltage fade, as a function of State of Charge and cycle life, with capacity data from HST indicates that the cycle life limiting mechanism is due to impedance growth, and formation of a second discharge plateau. With a second plateau on discharge, capacity from the cell is still available, but at an unacceptable low voltage of 0.8 V per cell (17.6 V battery). Data shows that cell impedance increases with cycle number and depth of discharge, as expected.
Document ID
20030031368
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Hollandsworth, Roger P.
(Lockheed Martin Missiles and Space Sunnyvale, CA, United States)
Armantrout, Jon D.
(Lockheed Martin Missiles and Space Sunnyvale, CA, United States)
Rao, Gopalakrishna M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Electronics And Electrical Engineering
Meeting Information
Meeting: 2002 NASA Aerospace Battery Workshop
Location: Huntsville, AL
Country: United States
Start Date: November 19, 2002
End Date: November 21, 2002
Sponsors: NASA Headquarters
Funding Number(s)
CONTRACT_GRANT: NAS5-5000
CONTRACT_GRANT: NAS8-32697
Distribution Limits
Public
Copyright
Public Use Permitted.
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