Effects of synthesized 4PbO·PbSO4 on the Initial capacity and cycle performance of lead dioxide electrode prepared by cementation leady oxide

The service life of lead-acid batteries is often limited by disintegration of the positive active mass structure. It is known that the latter depends on the phase composition, crystal morphology and paste density. In general, the electrode whose active mass is prepared from 4PbO·PbSO₄ pastes (denoted by 4BS_pas) has about 30% longer cycle lives than those obtained by 3PbO·PbSO₄·H₂O. Therefore, the initial capacity and cycle performance of lead dioxide electrodes prepared from 10, 30 and 50 wt.% 4BS_syn (chemically synthesized 4PbO·PbSO₄) addition with regard to the amount of cementation leady oxide were examined. Lead oxide (denoted by cementation leady oxide) was prepared by the pulverization of sponge lead prepared from a cementation reaction under the conditions of 90°C and 1.0 wt%HCl solution. 4BS_syn crystals were chemically synthesized in 40.1 wt.%H₂SO₄ with \-PbO. Without 4BS_syn, crystals lead dioxide electrode has shown a higher initial capacity than any other 4BS_syn contents and cycle performance was the best although the initial capacity is relatively low for 50 wt.% 4BS_syn.