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INTRODUCTION Section 28 ACCELERATED TESTING OF POROUS-GRAPHITE CHLORINE ELECTRODES The use of porous-graphite chlorine electrodes has resulted in controversy concern ing battery life. Although the low corrosion rate associated with low pH operation is apparently commensurate with the lifespan requirements, the need exists for an accelerated test to demonstrate that these estimates are realistic. In the past, the documented corrosion levels associated with chlor-alkali diaphragm cells has been a cause of concern when evaluating the potential of the zinc-chlorine battery. Although this concern remains, it has been substantially mitigated by data generated at EDA. The corrosion level demonstrated by the 1.7kWh battery system is thought to be the norm in zinc-chlorine battery operation. A recent concern is the voltaic stability of the "activated" porous-graphite elec trode. Further discussion of this topic follows. Nature of the Active Chlorine Electrode Section 34 of Part V presents the concept of an extended, more highly active surface layer of some finite thickness atop a base matrix. This structure is formed as a result of electrode activation. Removal of this more active layer produces a voltaic penalty, although less than possibly expected. The improvement in performance over virgin PG-60 is not solely due to this surface layer, but also to what appears to be a fundamental modification to the inner electrode matrix. Electrode processing has modified and improved wetting of the porous graphite, and this quite likely plays a major role in the performance of the matrix graphite. 28-1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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