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The zinc-deposit distribution was then calculated for the standard case where the resistance presented by the zinc electrode was included in the analysis. The zinc- deposit thickness variation was found to be 20.2% across the total width of the cell, i.e. a negligible decrease when compared to the 20.9% variation found when the zinc electrode was assumed to be an equipotential surface. Further, it was found that by the end of the first 10 minutes of charge, the resistance presented by the zinc electrode had decreased to a value one order of magnitude less than that of the chlorine electrode. Consequently, the assumption of an equipotential zinc surface did not significantly affect the accuracy of the analysis. EXPERIMENTAL INVESTIGATIONS In addition to the zinc-deposit resistivity and density measurements already noted, other measurements were made to confirm the calculated zinc-deposit thickness dis tribution. All of these measurements were conducted on nine zinc deposits peeled off in unbroken plates from test-cell substrates. These cells were charged for seven hours under substantially the same conditions as the standard -case parameter values. Micrometer measurements on the plates revealed that the zinc deposits consistently were thicker at the chlorine-bus side of the cell than at the zinc-bus side. How ever, the surface roughness of the zinc did not allow accurate measurement. Weight measurements were therefore employed. Discs, 0.25 in. diameter, were punched on each side of the plates. Figure 31-14 indicates the position of the discs with re spect to the plates. The center-line distance between the discs represents approx imately 80% of active cell width. Results of the weight measurements are shown in Table 31-5. The average weight variation across the width of the plates is 17.7% + 3.8%. DISCUSSION In the previous section an analytical technique was developed which may be used to calculate the variation in current density across the width of zinc-chlorine cells. This technique was then modified to calculate the effect of the current-density distribution on zinc electrodeposition. Experiments were also performed to deter mine the accuracy of these calculations. 31-24PDF Image | Development of the Zinc-Chlorine Battery for Utility
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