Study of the operation of Lead-Acid Battery Electrodes under hybrid battery-electrolyzer cycling profiles
Résumé
Flooded bead-acid batteries start producing oxygen and hydrogen during the final stages of the charge and the subsequent overcharge. The collection of the produced hydrogen allows increasing the overall energy efficiency and transforms the system into a hybrid device typically referenced as “Battolyzer” (battery-electrolyzer). The present work explores the feasibility of the above approach throughout a detailed study of the long-term ageing process of flooded tubular lead-acid cells subjected to various rates of discharge and overcharge emulating four different scenarios of Battolyzer use, starting from 70% Depth of Discharge cycling to nearly continuous water electrolysis. The combined results from the electrochemical and corrosion studies showed that the Battolyzer cells degradation is driven by the corrosion of the positive current collectors. The progressing of the corrosion process is strongly correlated with the amount of hydrogen produced. The increase of the depth of discharge results in minor decrease of the corrosion current indicating that the battery functionality of the Battolyzer is more advantageous than the continuous water electrolysis.
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