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Category :
Languages : en
Pages : 38

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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723736056
Category : Science
Languages : en
Pages : 38

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Samples of nickel fiber mat electrodes were investigated over a wide range of fiber diameters, electrode thickness, porosity and active material loading levels. Thickness' were 0.040, 0.060 and 0.080 inches for the plaque: fiber diameters were primarily 2, 4, and 8 micron and porosity was 85, 90, and 95%. Capacities of 3.5 in. diameter electrodes were determined in the flooded condition with both 26 and 31% potassium hydroxide solution. These capacity tests indicated that the highest capacities per unit weight were obtained at the 90% porosity level with a 4 micron diameter fiber plaque. It appeared that the thinner electrodes had somewhat better performance, consistent with sintered electrode history. Limited testing with two-positive-electrode boiler plate cells was also carried out. Considerable difficulty with constructing the cells was encountered with short circuits the major problem. Nevertheless, four cells were tested. The cell with 95% porosity electrodes failed during conditioning cycling due to high voltage during charge. Discharge showed that this cell had lost nearly all of its capacity. The other three cells after 20 conditioning cycles showed capacities consistent with the flooded capacities of the electrodes. Positive electrodes made from fiber substrates may well show a weight advantage of standard sintered electrodes, but need considerably more work to prove this statement. A major problem to be investigated is the lower strength of the substrate compared to standard sintered electrodes. Problems with welding of leads were significant and implications that the electrodes would expand more than sintered electrodes need to be investigated. Loading levels were lower than had been expected based on sintered electrode experiences and the lower loading led to lower capacity values. However, lower loading causes less expansion and contraction during cycling so that stress on the substrate is reduced.Rogers, Howard H.Glenn Research CenterFIBERS; SUBSTRATE

Author: Doris L. Britton
Publisher:
ISBN:
Category :
Languages : en
Pages : 12

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Author:
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ISBN:
Category : Space vehicles
Languages : en
Pages : 272

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Category : Technology
Languages : en
Pages : 1282

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Category :
Languages : en
Pages : 14

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Author: Jürgen Garche
Publisher: Newnes
ISBN: 0444527451
Category : Science
Languages : en
Pages : 4532

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The Encyclopedia of Electrochemical Power Sources is a truly interdisciplinary reference for those working with batteries, fuel cells, electrolyzers, supercapacitors, and photo-electrochemical cells. With a focus on the environmental and economic impact of electrochemical power sources, this five-volume work consolidates coverage of the field and serves as an entry point to the literature for professionals and students alike. Covers the main types of power sources, including their operating principles, systems, materials, and applications Serves as a primary source of information for electrochemists, materials scientists, energy technologists, and engineers Incorporates nearly 350 articles, with timely coverage of such topics as environmental and sustainability considerations

Author:
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ISBN:
Category :
Languages : en
Pages : 628

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Category : Aeronautics
Languages : en
Pages : 704

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ISBN:
Category : Power resources
Languages : en
Pages : 1510

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