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battery module. Simultaneously, the graphite machining cost per battery module would be significantly reduced. With the objective of minimizing performance variations and reducing the electrode machining cost, EDA is pursuing the development of larger electrodes. Previous work at this laboratory has shown that significant IR drops exist across the width of -3 the chlorine electrode due to its high resistivity (3.05 x 10 chlorine electrode of 2.563" appears to be close to the optimal width. The alternate method of increasing the electrode area is to increase the electrode height. For example, the use of a 6 " high electrode would represent a 50% increase in electrode area compared to the present 4" electrode. It is generally theorized that an increase in electrode height could increase the rate of corrosion of zinc at the top of the zinc electrodes due to the higher elec trolyte velocity at the top. The extent to which the electrode height can be in creased was experimentally evaluated. The objectives of this study are to deter mine : • the effect of electrolyte-static head • the minimum electrolyte-static head for the current battery • the maximum possible height of the electrode with acceptable coulombic and voltaic performances The results from this investigation will be applied to future peak-shaving battery designs. EXPERIMENTAL APPROACH The effect of the electrolyte-static head on the electrochemical performance of zinc-chlorine cells was examined in a typical EDA test system (Figure 32-1). Elec trolyte of 2M ZnCl^ from the sump was circulated through a constant temperature waterbathandafilterusingamicropump. Theflowwasmonitoredbyaflowmeter and the temperature was controlled at 300C-35°C, Chlorination of the electrolyte on discharge was achieved by use of a gas sparging tube located in the sump. The cell enclosure (case) is an integration of a sump and a test cell (Figure 32-2). The test cell contains two pairs of profiled chlorine electrodes (PG-60) and two pairs of zinc electrodes (ATJ). These electrodes were assembled according to the bipolar comb-type design. 32-2 ohm-cm). The presentPDF Image | Development of the Zinc-Chlorine Battery for Utility
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