Cycle-life improvement of Zn/NiOOH cells by the addition of Ca(OH) sub 2 to the zinc electrode

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The addition of Ca(OH){sub 2} to the zinc electrode of Zn/NiOOH cells was investigated in order to determine its effect on reducing the rate of Zinc redistribution. Cells containing 0, 10, 25, and 40 mol% Ca(OH){sub 2} in the zinc electrode were constructed and tested. Ca(OH){sub 2} was found to form a calcium zincate complex with the zincate-supersaturated KOH solution created during the discharge half-cycle. As Ca(OH){sub 2} is insoluble in the electrolyte, the formation of this complex (containing two Zn atoms to one Ca) significantly reduces the Zinc redistribution rate. Electrodes with only 10% Ca(OH){sub 2} were found to … continued below

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Pages: (151 p)

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Jain, R.; McLarnon, F. R. & Cairns, E. J. August 1, 1989.

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The addition of Ca(OH){sub 2} to the zinc electrode of Zn/NiOOH cells was investigated in order to determine its effect on reducing the rate of Zinc redistribution. Cells containing 0, 10, 25, and 40 mol% Ca(OH){sub 2} in the zinc electrode were constructed and tested. Ca(OH){sub 2} was found to form a calcium zincate complex with the zincate-supersaturated KOH solution created during the discharge half-cycle. As Ca(OH){sub 2} is insoluble in the electrolyte, the formation of this complex (containing two Zn atoms to one Ca) significantly reduces the Zinc redistribution rate. Electrodes with only 10% Ca(OH){sub 2} were found to contain insufficient Ca(OH){sub 2} to complex with enough Zinc to make a dramatic improvement on cycle life. The 25%-Ca(OH){sub 2} electrodes, however, were found to retain their capacity beyond 150 deep discharge cycles, with indication that further Zinc redistribution would occur very slowly. The Zinc utilization of the Ca-containing electrodes showed dramatic improvement over the Ca-free zinc electrodes. 23 refs., 49 figs., 7 tabs.

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Pages: (151 p)

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NTIS, PC A08/MF A01 - OSTI; GPO Dep.

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  • Other Information: Thesis (M.S.)

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  • Other: DE90004040
  • Report No.: LBL-25332
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5194778
  • Archival Resource Key: ark:/67531/metadc1053282

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  • August 1, 1989

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  • Jan. 22, 2018, 7:23 a.m.

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Jain, R.; McLarnon, F. R. & Cairns, E. J. Cycle-life improvement of Zn/NiOOH cells by the addition of Ca(OH) sub 2 to the zinc electrode, report, August 1, 1989; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1053282/: accessed May 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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