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current density at the chlorine bus would be 57.3mft/cm2 and 46.4mA/cm2 at the zinc bus. The voltage losses in the cell were also calculated. The total voltage loss across the chlorine electrode was found to be 7.8mV. The total loss due to the electrode polarizations and electrolyte resistivity was 33.4mV. This left a total of 18.8mV available for losses in the contacts and bus bars, as 2.18V was the standard case value for the charging voltage. The sensitivity of the current-density distribution to changes from the standard- case.values is explored by analyzing the effects of variation of the five major active-cell parameters, as shown in Table 31-3. Table 31-3 CELL PARAMETERS INVESTIGAGED Title Cell width Compound resistivity - gap product Chlorine electrode resistivity - thickness ratio Some of the cell parameters are combined to avoid duplication in presenting the results. For instance, a change in the value of the chlorine-electrode resistivity- thickness ratio, p^/S^, may also be considered as a change in the chlorine-electrode resistivity, p^, when the chlorine-electrode thickness, 8^, is held constant, and vice versa. Figure 31-8 illustrates the current-density curves for changes in the cell width, W. The curve denoted "6cm" represents the standard case, and only the width parameter was varied from the standard case to obtain the other curves. The effect of the cell width on current-density distribution is more evident in Figure 31-9. This curve represents the current density calculated at the chlorine bus — the maximum current density in the cell — as a function of cell width. This curve is parabolic in nature, and indicates the sensitivity of current density to increases in the cell width. Parameter W P '6 te P /5 gg 31-16PDF Image | Development of the Zinc-Chlorine Battery for Utility
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