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8 i tf> 0> H Z tu c c 3 o zo «o e c O o Figure 24-13. Experimentally determined corrosion rate of zinc by dissolved chlo rine as a function of chlorine concen tration. Note: Test conduted with 3M ZnCl2 electrolyte at 30°C. The corrosion current values were utilized to predict coulombic losses while charg ing and discharge at 1.5g/£ and 1.5g/i. chlorine concentrations, respectively, in the cell gap. The percentage losses are based on a theoretical charge capacity 2 density of 196mAh/cm . Summation of the corrosion current and parasitic current data predicts a round-trip coulombic efficiency of 87.3% or 78.6% depending upon the normalized value of the corrosion current used, i.e. either (1.31mA/cm^)/g/l or (2.36mA/cm^)/g/l. Weight Distribution of Zinc Deposit From the beginning, the performance efficiencies of submodule #3 were below expec tations. Voltage monitoring revealed that there was a spread in the efficiencies of each of the ten unit cells in this submodule. Cell number 9 showed the lowest 012 CHLORINE CONCENTRATION • 24-20PDF Image | Development of the Zinc-Chlorine Battery for Utility
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