AUXILIARY ELECTRODE FOR CHARGE CONTROL OF SEALED NICKEL-CADMIUM BATTERIES.
Quarterly rept. no. 3, 15 Dec 64-14 Mar 65,
EDISON (THOMAS A) INDUSTRIES BLOOMFIELD NJ PRIMARY BATTERY DIV
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For platinized cloth auxiliary electrodes the quantity of electrolyte is critical with too little electrolyte the O2 reduction polarization curve is concave upward, with too much it shows a good plateau and voltage at low currents, but falls off prematurely and sharply. For VCB or WCB Black the optimum amount is about 0.13 .01 gram of 30 KOH per square inch. Contamination by CO2 adversely affects performance, but with the optimum quantity of KOH,conversion of 30 equivalent to carbonate can be tolerated. As O2 reduction electrodes unplatinized cloths are only 15 5o 110 as good as platinized ones. Platinized cloths moistened with 30 KOH catalyze the H2 plus O2 reaction at a moderate rate. Techniques have been worked out for modifying commercial hermetically sealed cells to allow incorporation of cloth auxiliary electrodes. Author