IMPEDANCE ANALYSIS OF POSITIVE ELECTRODE FOR A LEAD-ACID-BATTERY

The electrochemical performance of the formed positive electrode after long term storage at various conditions has been studied by the imped ance analysis. The polarization curves of the positive electrodes indi cated that the formation of lead sulfate increases during the storage and the sulfate formes the interface of positive grid and active mater ial. When the formed positive electrode was stored under a high humidi ty atmosphere, the passivation film was formed at the interface. The s imulation of the equivalent circuit showed that the resistivity of the grid/active material interface increases by the passive film. The sim ulated results agreed well with the experimental results.