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This expression was used to determine the distribution of zinc across the cell for the standard case. However, two calculations are presented. In the first calcu lation, the assumption that the zinc electrode is an equipotential surface is again utilized. In the second, the resistance of the zinc electrode is included, because this resistance is significant at the initiation of charge. An expression defined as the zinc-electrode resistivity-thickness ratio, is derived to provide for the inclusion of a zinc-electrode resistance term in the distributed parameter equations. This expression which represents the parallel combination of the electrode-substrate resistance and the zinc-deposit resistance is Parameter Title electrode-substrate resistivity electrode-substrate thickness zinc-deposit resistivity zinc-deposit thickness Standard-Case Value 1.0mf2-cm 0,05cm 0.012mQ-cm initially 0 P 6 pd 6d s s P z 6 z (48) The title and standard-case values for these parameters are listed in Table 31-4. Table 31-4 ZINC-ELECTRODE RESISTIVITY-THICKNESS RATIO PARAMETERS The standard-case value of the zinc-deposit resistivity is approximately twice that of the theoretical resistivity of zinc metal. The standard-case value was deter mined from laboratory measurements made on several zinc deposits which were peeled from test cells. By substituting the zinc-electrode resistive component into the differential cir cuit model of the single cell (Figure 31-6), the resulting equations remain essen tially the same. The only change from equation 26 is the expression for m2. The new 31-21PDF Image | Development of the Zinc-Chlorine Battery for Utility
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