Gas Recombination in Sealed Ni-MHx Cells.-The effects of charge rate, electrolyte saturation level and initial state of charge of positive electrodes consisting of rare earth hydrogen storage alloys on the title process are studied. By determining the differential capacity of Ni(OH)2 electrodes, an improved mathematical model is used for the evaluation of the gas recombination parameters during charge, overcharge, rest, and discharge of the positive-limited title cells. The oxygen recombination on the Ni(OH)2 electrodes can be neglected due to H2O consumption during electrode discharge. Longer overdischarge leads to an increase of pressure in the sealed cell at unsaturated electrolyte level and to recombination of the evolved gas after a subsequent rest and recharge operation. -(ZHU, W.
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