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Analysis of Pressure Variations in a Low-Pressure Nickel-Hydrogen Battery - Part 1.
MedLine Citation:
PMID:  22423175     Owner:  NLM     Status:  Publisher    
A low pressure nickel-hydrogen battery using either a metal hydride or gaseous hydrogen for H(2) storage has been developed for use in implantable neuroprosthetic devices. In this paper, pressure variations inside the cell for the gaseous hydrogen version are analyzed and correlated with oxygen evolution side reaction at the end of charging, the recombination of oxygen with hydrogen during charging and a subsequent rest period, and the self-discharge of the nickel electrode. About 70% of the recombination occurred simultaneously with oxygen evolution during charging and the remaining oxygen recombined with hydrogen during the 1(st) hour after charging. Self-discharge of the cell varies linearly with hydrogen pressure at a given state of charge and increased with increasing battery charge levels. The coulometric efficiency calculated based on analysis of the pressure-time data agreed well with the efficiency calculated based on the current-time data. Pressure variations in the battery are simulated accurately to predict coulometric efficiency and the state of charge of the cell, factors of extreme importance for a battery intended for implantation within the human body.
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:  2012-3-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101524266     Medline TA:  J Power Sources     Country:  -    
Other Details:
Languages:  ENG     Pagination:  429-435     Citation Subset:  -    
Department of Chemical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
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