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operated battery, i.e. the 1.7kWh unit, is insignificant. This observation is based upon visual inspection of filters utilized in this and other battery systems. Although not a quantitative measure, it is based upon repeated observation with consistent results and therefore takes on a meaningful level of significance. Newly assembled batteries may exhibit significant levels of graphitic debris due to the manufacturing and assembly process. Filtration or a simple electrolyte change serves to handle this situation quite satisfactorily. When operating continuously, a battery system essentially handles carbonaceous debris "automatically". By this it is meant that the small amount of particulate material being generated is continuously being corroded to CO^ chemically. This purely chemical corrosion, it would appear, will enable the battery to be "self cleaning" in this regard so long as operation tinder proper conditions is maintained. It remains for this study, once underway, to further document this premise. Estimation of "Acceptable" Corrosion Level The maximum tolerable steady-state rate of carbon dioxide evolution for a system with chlorine electrodes, 80 mils in thickness, may be calculated approximately as follows: Total CO^ evolution possible (O.OSin)•(2.54cm/in)•(1cm*2)•(lg/cm3 of PG-60)•(24£ COs/mole) 12 g of graphite/mole 2 400ml CO^/cm of electrode Presuming that 10% of the electrode can be consumed and converted to CO2 without causing performance deterioration in 2000 cycles, then each square centimeter of electrode surface could generate (0.1)•(400ml 00^)72000 cycles = 0.02ml CO^/cycle 22 The amount of chlorine evolved per cm during charge of 200mAh/cm is (0.2Ah)•(1.32g Cl2/Ah)•(24i/mole)/(71g Cl2/mole) = 89ml Cl2/cycle 28-4PDF Image | Development of the Zinc-Chlorine Battery for Utility
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