Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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0> zo < cc 1- z UJ oz o o UJ z tE O X o PRESSURE (atmosphere-absolute) Figure 24-10. Showing constant temperature relation­ ship between dissolved chlorine gas and gas phase pressure. Test made with 3M ZnCl^ electrolyte. Parasitic and Corrosion Losses* • During the early stages of this program it became evident that there were differ­ ences in the performance of individual submodule assemblies. It also was apparent that obtainable efficiencies were below the target objectives. Hence it was de­ cided to evaluate the magnitude and possible sources of coulombic losses in the system. Parasitic current measurements were performed on individual unit cells, on pairs of cells, and across the complete battery stack. The measurements were taken at several constant applied voltages below the decomposition potential of ZnCl^ using dechlorinated electrolyte under both flow and non-flow conditions. Described below are four experiments designed to evaluate the following parasitic losses: • baseline currents (not considered a loss) • intercell leakage currents • inlet-manifold parasitic currents • outlet-flow parasitic currents 24-15

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