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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effect due to static-head height. Similar results were obtained in an 8" electrode test cell. Coulombic Efficiency vs. Static Head. The normalized coulombic efficiencies (defined as the accumulated coulombs at each discharge step to the total discharge coulombs) 222 at the three discharged steps, i.e. 30mA/cm , 20mA/cm , and lOmA/cm , over a wide range of static head heights for a 4" electrode are tabulated in Table 32-2. With the chlorine concentration of 2.4-2.5g/f during charge and 2.1-2.2g/£ during discharge, the total coulombic efficiencies are approximately 67%, independent of the static head height, and the effect of electrolyte-static head on the coulombic efficiency is insignificant. The normalized coulombic efficiency at each discharge step was also found to be independent of the electrolyte static-head height, within experimental error. The normalized coulombic efficiency at the third discharge 2 step, i.e. 10mA/cm , is equivalent to the total coulombic efficiency. Table 32-2 COULOMBIC EFFICIENCY VS. ELECTROLYTE-STATIC HEAD FOR THE 4" ELECTRODE CELL Electrolyte Static Head (inch) 0.10 0.30 0.50 Q.50 0.80 1.8 3.1 4.1 4.1 Total Coulombic Efficiency (%) 66.1 67.2 67.06 67.4 66.5 66.8 66.8 66.0 65.8 Normalized Coulombic Efficiency at discharge step of: 22 30mA/cm 20mA/cm 10mA/cm' ^Defined as the accumulated coulombs at the respective discharge step over the total coulombs. 32-7 86.8 97.9 91 97.4 100 91 89 97.8 90.5 97.5 91.8 97.8 93 86.8 86 100 100 100 100 97.8 100 98.4 100 97.9 100 97.4 100

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