Nineteen different designs of nickel electrodes were tested in Ni/H2 boiler plate cells in an accelerated low earth orbit cycle regime to the end of their life. The failure analyses of these cells showed that the major performance changes due to the cycling wasa severe reduction of their high rate discharge capability rather than an absolute capacity reduction. Many physical changes of the nickel electrodes were observed after the cycling test. These changes include dimensional expansion, sinter rupture, loose black powdering of the active material, morphology changes, active material migration, increase of pore volume, change of pore distribution, and increase of surface area. All of these were caused by active material expansion with cycling. Among these changes, the morphology change which involves migration of active material away from the current collecting nickel sinter appears to be that most responsible for the reduction of the rate capability.


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    Title :

    Long life nickel electrodes for a nickel-hydrogen cell: 3. Results of an accelerated test and failure analysis


    Additional title:

    Langlebige Nickelelektroden fuer eine Nickel-Wasserstoff-Zelle: III. Ergebnisse eines beschleunigten Tests und Ausfallanalysen


    Contributors:


    Publication date :

    1984


    Size :

    7 Seiten, 18 Bilder, 1 Tabelle, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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