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Section 29 INTRODUCTION TO PART V The overall objective of the joint EPRI-EDA project is the commercialization of a high-efficiency, cost-effective, zinc-chlorine battery for peak-shaving applica tions. Extensive development is required to meet this objective. Analytical and experimental work performed during Phase I is reported here as Part V of this re port. Generally, the work reported here was directed toward improved electrode performance, higher electrochemical efficiencies, and development of alternative cost-effective construction materials. Following these introductory pages of Section 29, there are eight separate sections, each dealing with a particular phase of this development work. Section 30 reports on an investigation into the volumetric changes and the acidity properties of zinc chloride electrolytes under certain conditions. This, together with the work reported in Section 37, is important in formulating an optimum elec trolyte for maximum battery performance and efficiency. Together, Section 31 and 32 report on fundamental studies that seek to optimize electrode size. The proper width for a chlorine electrode in a comb-type bipolar cell is influenced by the effects that current distributions across the face have on cell performance. The proper height for an electrode in this type cell is in fluenced by a complex interaction of hydraulic and chemical-corrosion parameters. The work reported in these two sections will not only help establish the maximum size of flat-plate type electrodes to be used in future cells but will assist in improving the mathematical models used to study cell-efficiency parameters. Sections 33 and 34 report on continuing efforts to qualify improved materials of construction for the zinc-chlorine battery system. Large quantities of plastics and graphite will be needed in commercial-sized batteries. Section 33 describes the work done to identify low-cost plastic compounds to replace expensive fluorine- based polymers used in laboratory systems. A number of different plastics are needed that can be economically processed and will withstand the corrosive effects of the chlorinated electrolyte without releasing contaminants that adversely affect 29-1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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