Abstract
Basic studies to clarify the premature capacity loss (PCL) mechanism have been carried out. It was found that PCL is a phenomenon due to the increase of positive plate resistance, especially the interfacial resistance between the positive grid and the positive active material (PAM) by PbSO 4 formation in the corrosion layer. PCL occurred when the adhesion between the grid and the PAM was poor, H 2SO 4 concentration at the interface between the grid and the PAM is high and the corrosion layer mainly consisted of β-PbO 2.
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