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Experiment No. 3. The inlet manifold parasitic current was obtained by making simi lar measurements across the battery stack using a non-chlorinated electrolyte flowing only enough to keep the piping full. These data appear as line 3 in Figure 24-11# and the inlet contribution is the difference between line 2 and 3. Experiment No, 4. The outlet-flow parasitic current was obtained at the normal rate of supply (,v2ml/cm2-min) of non-chlorinated electrolyte to the cells. This filled the return-flow channel system with the proper amount of liquid to produce the current paths to the sump found in an operating battery. Line 4 of Figure 24-11 is a plot of these data, and the outlet contribution is the difference between line 3 and 4. Extrapolation of these data to 19.3 volts per submodule (1.93 volts/cell) and 22.0 volts per submodule (2.20 volts/cell) permitted determination of the projected values for these contributions during discharge and charge, respectively. Table 24-2 summarizes the projected values. The total parasitic current is taken as the sum of the leakage, inlet, and outlet currents. These data were obtained in 3M ZnCl2 at 45°C. Table 24-3 summarizes the projected capacity losses in the submodule caused by these parasitic currents. The 64Ah loss on charge accounts for a 1.7% projected coulombic efficiency loss, while the 38Ah loss on discharge accounts for another 0.7% projected coulombic efficiency loss due to parasitic currents flowing in the stack. Corrosion current measurements were performed in the same manner as the total parasitic and baseline currents, i.e. across the submodule utilizing the normal flow-rate of electrolyte to the cells. The measurements were made however, using chlorinated electrolyte. Figure 24-12 contains plots of the corrosion current data obtained using 3M ZnCl2 at 30°C for chlorine concentrations of 0, 1.0, 1.5, and 2.0 g/f. The data without chlorine (line A) was taken as a measure of the total parasitic plus baseline current and can be compared with line 4 of Figure 24-11. The projected corrosion currents are calculated from the differences between the data with chlorine and data without chlorine extrapolated to the charge and dis charge voltages. From the shape of these curves, it can be deduced that mass diffu sion of dissolved chlorine is controlling and limits the current at the operating 24-17PDF Image | Development of the Zinc-Chlorine Battery for Utility
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