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Measurements on the solubility of chlorine in ZnCl^ electrolyte at various pressures and temperatures support the general theories very well. However, any verification of the assumed improvement in stack performance with reduced chlorine concentration is difficult to find in the test data. Perhaps it is masked by other prominent variables. Special experiments employing a wider range of vacuum and temperature will be conducted during Phase II to test the assumption that chlorine concentration does affect the rate of corrosion of zinc plate, and thus the coulombic efficiency of a cell. In summary, the significant results of the submodule test program can be highlighted as-—follows-;......—......—......—......-.......-......—.....-—.....—........—..... • • ® • REFERENCE There is wide variation in performance of unit cells in any submodule stack. This variation is not consistent and is detrimental to submodule performance. The restrictions on operating parameters and on electrolyte concen tration swing were too severe to achieve the specified charge capa city at an acceptable efficiency. Coulombic charge inefficiencies vary with time, being much higher with longer cycles. Improvements in coulombic efficiency by operating at reduced pressure (and thus at reduced chlorine concentrations) could not be demonstrated by the data collected to date. 24-1. Jung Kim and Jacob Jorne, "Mass Transfer of Dissolved Chlorine to a Rotating-Zinc Hemisphere in ZnCl2 Solution". J. Electrochem, Soc., January, 1978, p. 125. 24-24PDF Image | Development of the Zinc-Chlorine Battery for Utility
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