Einfluss von Phosphorsäure auf die Leistung einer Bleisäurezelle mit Antimon‐Gitter unter Ladung und Entladung bei konstanter Stromstärke

Effect of phosphoric acid on the performance of Pb‐1.7%Sb grid of lead‐acid cell is studied in 5 M H 2 SO 4 by cyclic galvanostatic polarization and impedance spectroscopy. An increase in capacitance to a maximum is recorded during the initial stages of the electro‐reduction of PbO 2 into Pb(II) compounds and attributed to concurrent compositional and dimensional changes. These changes include removal of O 2 bubbles, insertion of large amounts of H 2 SO 4 and H 2 O. Efficiency of PbO 2 formation decreases, while its rate of self‐discharge increases with increasing the charging current and in the presence of H 3 PO 4 . The charge capacity increases with increasing the discharging current due to the decrease in the self‐discharge. The charge capacity is lower in the presence of H 3 PO 4 . On increasing the cycle number, the corrodibility of the grid increases, because more layers of the surface Pb are involved in the self‐discharge. H 3 PO 4 significantly retards the effect of cycle number.