[PDF] Development Of Zinc Electrodes And Inorganic Separators For Large Size Silver Zinc Batteries eBook

Author : Allen Charkey
Publisher :
Page : 21 pages
File Size : 39,51 MB
Release : 1976
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ISBN :

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During the nineteen month period of this contract both 40Ahr and 850Ahr (NR-1) size silver-zinc cells were designed, fabricated and tested to evaluate improved zinc electrode structures and inorganic separators developed by ERC. The 40Ahr cell groups have completed cycling and have achieved 150-300 cycles depending on the cell construction. The NR-1 batteries have completed 150-300 days of testing on both float and deep discharge regimes with the testing continuing. Three NR-1 and three DSRV (525Ahr) cells have been fabricated with the most promising design and have been delivered to NAD-Crane for life test evaluation. The most promising design from data obtained in both 40Ahr and 850Ahr cells appears to be a combination of FSC and ERC 2002 inorganic separator with KT separator on the negative electrode. The various negative plate additives investigated did improve performance in cells with FSC separators but did not show an additional improvement when tested in cells with inorganic and FSC separators in combination.

Author : Roberto Serenyi
Publisher :
Page : 50 pages
File Size : 20,61 MB
Release : 1994
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ISBN :

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Substantial increases in the cost effectiveness and range of naval underwater vehicles are possible by virtue of advances made, in this program, to silver-zinc, vehicle propulsion batteries. To improve battery cycle life and energy density, Electro-Permeable Membranes (EPMs) were used (1) as additives and/or as coatings for the negative electrodes and (2) as coatings for conventional separator materials' Also, bismuth oxide was tested as an additive to the negative electrodes and P2291-40/20, a radiation-grafted polyethylene film, as a separator used in conjunction with silver-treated cellophane. EPMs used as negative-electrode additives and also as coatings for Celgard 2500 microporous polypropylene greatly improved cells. Cells with EPMs used as coatings for the negative electrodes failed rapidly because of an error in formulation. Cells with 10 percent bismuth oxide in the negative electrodes exhibited substantially lower capacity than the standard cells and were removed from the test. Cells with radiation-grafted polyethylene separators provided fewer cycles than the standard cells, with 5 percent higher capacity and 6 percent lower utilization of active materials by cycle 60. However, the slightly better capacity of these cells, realized due to the additional space available for active materials, does not compensate for their generally unimpressive performance. Silver-zinc batteries, Bismuth oxide, Electro-Permeable Membranes (EPMS), Polyethylene separators, Electrode additives and coatings.