Effect of Surfactants on the Electrochemical Behavior of the Positive Plate

摘要

The main goal of this research is to improve the performance of positive plate of lead-acid batteryusing surfactants in 0.5 M H2SO4. The use of surfactants aims to increase the ability and the cycle lifeof the positive active material. The electrochemical behavior of pure lead and PbO2 electrodes interfacewas investigated at room temperature by cyclic voltammetry (CV), electrochemical impedancespectroscopy (EIS) and potential-dynamic polarization curves. Scanning electron microscopy (SEM)was used to explore the film layer morphology deposited on the surface of working electrodes. Cyclicvoltammograms of pure lead (Pb) electrode show that in the presence of PS the current peaks of thetransition of PbO2 to PbSO4 and PbO2 to PbSO4 dropped at small concentrations of surfactants. Weobserved a remarkable improvement of the discharge capacity of the PAM for an amount of PSranging between 10 and 50 ppm. EIS results indicate the improvement of mass transport by thedecrease of resistance.In the other hand, the PbSO4 surface layers and the crystal size of PbSO4 changes with impact effect ofsurfactants. As a result of the morphological changes which occurred, the PbO2 films formed arehardly more reducible with PbSO4 and delays the appearance of resistive PbSO4 layers at the materialinterface. As a conclusion, we can say that the electrical performance of the battery increase byextending the life cycle.