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After "debugging" the cells, fresh electrolyte was put into each cell. Extreme care was taken to minimize contamination of the electrolyte and cells. The electro lyte was circulated over zinc rods to remove any metal impurities. Samples were retained for atomic absorption analysis. The cells were then cycled daily and data recorded until relatively stable cycles again could be achieved, then various test materials were placed into the cells for evaluation. Records specifying the plastic parts in each cell, made from materials other than Kynar and Teflon, were recorded together with cycling data. One of five cells was retained as a control. The cycling data from this cell, constructed entirely from Kynar and Teflon, was used as the base line for comparison with cells containing test materials. Initial electrochemical., evaluation consists of cycling the test cell with spacers and electrode masks made from the materials to be evaluated. The spacers provide a large surface area for exposure to the electrolyte in close proximity to the chlorine sparger and heating element. The masks serve to expose the material to the most active electrochemical treatment within the cells. This is illustrated in Figure 33-3. Gas analysis for , 0^, and 00^ is taken daily during charge cycles as is the pH variation. Any adjustments made to the electrolyte are recorded. Usable coulombic efficiencies for each cell are plotted against cycle number. Atomic absorption and total organic carbon analysis are made periodically to determine leaching and to indicate possible breakdown of the polymer chains. If cell cycling data does not deviate extensively from the control baseline after a test material has been implemented as masks and spacers, an entire cell is constructed from the material and is cycled for 100 data cycles using the same parameters. Final conclusive qualification of any new material is difficult because of the many interrelated operating factors within a battery. Time-in-service is the only true test. During the Phase II program all data will be analyzed pertaining to those materials that have successfully completed the screening and the electrochemical test. This statistical and numerical analysis together with careful interpretation should permit identification of commercially acceptable battery construction materials. 33-6PDF Image | Development of the Zinc-Chlorine Battery for Utility
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