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Electrode Height (inch) 4 4 6 6 6 8 8 8 Electrolyte-Static Head (inch) 0.30 0.30 0.38 0.38 4.25 0.38 0.60 2.50 Total Coulombic Efficiency (%) at One Step Discharge 30mA/cm2 67 67 67 67 67 68 66 66 Table 32-3 COULOMBIC EFFICIENCY VS. ELECTROLYTE-STATIC HEAD FOR THE 4", 6", AND 8" ELECTRODE CELLS Table 32-3 shows the total coulombic efficiencies obtained during constant current 2 discharges, i.e. 30mA/cm , using various static head heights for the 4", 6", and 8" electrode cells. The effect of static head height on the coulombic efficiency was found to be insignificant at any of the three electrode heights. Charge Capacity vs. Static Head. The effect of static head on the maximum charge capacity was determined for a 4" electrode cell. Under the conditions tested, the 2 maximum capacity obtained lies in the neighborhood of 190mAh/cm , i.e. 6 hours charge 2 at 30mA/cm , independent of the static heads of 0.10" and 4.10" tested. Effect of Electrode Height Voltage-Time Profile vs. Electrode Height. Generally, a voltage-time profile pro vides a good measure of the gross effect of electrode-height on the cell performance. Figure 32-4 compares the one step discharge profile for the 4", 6", and 8" high electrode cells. The discharge profile for a 4" electrode cell with a 0.30" static head is used as a standard for comparison. The discharge profiles for the 6" and 8" electrode cells show the usual characteristics of flat plateau and sharp tailing at the termination of discharge, and are essentially identical to that of the 4" elec trode cell. These results indicate that an increase of electrode-height from the basic 4" to 6" and 8", i.e. a 50-100% area increase, causes neither a significant loss in voltaic performance nor maldistribution of current density. 32-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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