This report presents the physical property and performance data, including silver migration rates, for a matrix of model cells built to evaluate commercially available cellulosic separations for the alkaline silver-zinc rechargeable chemistry.Physical property data were initially used to screen the separations which would be used in model cell evaluations. Nine types of cellulosic materials were then built into sets of thirteen each nominal 28 Ah model cells which were identical except for the separation used. The number of layers of separation in each case was selected to give a constant internal stack pressure. Seven cells were placed on 100% depth-of-discharge (DOD) cycling, five were placed on thirty day wet stand at full charge with 100%DOD cycling, and one cell from each set was removed after initial formation for baseline destructive physical analysis (DPA). During cycling, cells were also removed at intervals for DPA.The separations selected included six varieties of cellophane film and three of sausage casing. The intent of the program was to determine whether cell performance for a given cellulosic material could be tied to its physical properties, so that theseproperties could be used as a predictive basis for selection of separation to be used in future Fleet applications, particularly for batteries for undersea platforms.
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