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CHLORINE BUS CHLORINE ELECTRODE ZINC BUS ZINC ELECTRODE Figure 31-3. Schematic illustration of voltage drops in a zinc-chlorine cell, showing ohmic polarizations in the buses (Vp,) , electrode-bus contacts (Vf and Vx) , electrodes (Vg and Vz), and the electrolyte (Ve). The zinc- and chlo rine-electrode polarizations are V0 and Vp, respectively. are fabricated of graphite. However, within minutes after the initiation of charge, the zinc-electrode resistance decreases significantly. This is due to the electro deposition of highly-conductive zinc on this electrode. Consequently, the zinc electrode is assumed to be an equipotential surface. The IR-free polarizations at the chlorine and zinc electrodes are represented by and V , respectively. The voltage loss in the electrolyte across the inter electrode gap is represented by V . For modeling purposes, all three polarizations are fused into one resistive component. The necessary assumption is that the IR- free polarizations conform to Ohm's law. Figure 31-4, a typical cell-polarization plot, illustrates the validity of this assumption. The IR-free polarization is represented as the difference between the total and ohmic polarization curves. It may be observed that the ohmic polarization curve is linear with an intercept at 2.12 volts, the open-circuit voltage (O.C.V.) of 31-5PDF Image | Development of the Zinc-Chlorine Battery for Utility
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