Document Detail

Analysis of Pressure Variations in a Low-Pressure Nickel-Hydrogen Battery- Part 2: Cells with Metal Hydride Storage.
MedLine Citation:
PMID:  22711974     Owner:  NLM     Status:  Publisher    
A sub-atmospheric pressure nickel hydrogen (Ni-H(2)) battery with metal hydride for hydrogen storage is developed for implantable neuroprosthetic devices. Pressure variations during charge and discharge of the cell are analyzed at different states of charge and are found to follow the desorption curve of the pressure composition isotherm (PCI) of the metal hydride. The measured pressure agreed well with the calculated theoretical pressure based on the PCI and is used to predict the state of charge of the battery. Hydrogen equilibration with the metal hydride during charge/discharge cycling is fast when the pressure is in the range from 8 to 13 psia and slower in the range from 6 to 8 psia. The time constant for the slower hydrogen equilibration, 1.37h, is similar to the time constant for oxygen recombination and therefore pressure changes due to different mechanisms are difficult to estimate. The self-discharge rate of the cell with metal hydride is two times lower in comparison to the cell with gaseous hydrogen storage alone and is a result of the lower pressure in the cell when the metal hydride is used.
B K Purushothaman; J S Wainright
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Publication Detail:
Journal Detail:
Title:  Journal of power sources     Volume:  206     ISSN:  0378-7753     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-6-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101524266     Medline TA:  J Power Sources     Country:  -    
Other Details:
Languages:  ENG     Pagination:  421-428     Citation Subset:  -    
Department of Chemical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
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