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Nickel-hydrogen battery self-discharge mechanism and methods for its inhibitionA review of our studies on the elucidation of the self-discharge mechanism of the Ni/H2 battery and methods to inhibit this phenomena is presented. The results show that (1) the rate of heat generation from nickel hydroxide powders and from electrodes increases with increase of hydrogen pressure, simultaneously, the open-circuit potential of the nickel hydroxide electrode is shifted in a negative direction more rapidly, indicating the transformation of NiOOH to Ni(OH)2; (2) heat generation rates measured in the microcalorimeter are considerably faster for electrolyte starved electrodes than for electrolyte-flooded electrodes; (3) there is a good correlation between the extent of self-discharge, as determined by heat generation in microcalorimetric measurement and capacity change; and (4) the self-discharge in Ni/H2 battery occurs via direct reduction of the active material by pressurized hydrogen. The addition of cadmium to the electrode reduces the self-discharge.
Document ID
19930048970
Document Type
Conference Paper
Authors
Visintin, Arnaldo (NASA Headquarters Washington, DC United States)
Anani, Anaba (NASA Headquarters Washington, DC United States)
Srinivasan, Supramaniam (NASA Headquarters Washington, DC United States)
Appleby, A. J. (Texas A & M Univ. College Station, United States)
Lim, Hong S. (Hughes Aircraft Co., Electron Dynamics Div., Torrance CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Hydrogen storage materials, batteries, and electrochemistry; Proceedings of the Symposium, Phoenix, AZ, Oct. 14-17, 1991 (A93-32963 12-25)
Subject Category
INORGANIC AND PHYSICAL CHEMISTRY
Distribution Limits
Public
Copyright
Other