Journal of Applied Electrochemistry

, Volume 27, Issue 6, pp 720–730 | Cite as

Influence of antimony ions and PbSO4 content in the corrosion layer on the properties of the grid/active mass interface in positive lead–acid battery plates



Antimony in lead/antimony alloys is known to have a beneficial influence on the capacity and cycle life of lead–acid battery positive plates. The present work shows that Sb3O93− ions formed on oxidation of PbSb alloys improve the capacity of the Pb/PbO2 electrode, whilst SbOSO4− ions have an adverse effect and passivate this electrode. A mechanism of the influence of these ions is proposed based on the gel–crystal concept for the structure of PbO2. The paper also discusses the effect of PbSO4 formed at the grid/PAM interface on the capacity. It has been established that the major part of the PbSO4 crystals are oxidized to PbO2 within a few cycles. There still remain a certain number of PbSO4 crystals which border narrow pores and are oxidized at a very slow rate, thus preserving their influence even after 10 discharge–charge cycles. It has also been found that the higher the density of PAM the stronger the adverse effect of PbSO4 in the grid/PAM interface on the capacity. All these phenomena are related to the PCL effect and methods to suppress them are proposed.


Oxidation Adverse Effect Cycle Life Antimony Major Part 
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© Chapman and Hall 1997

Authors and Affiliations

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    • 1
    • 1
  1. 1.Central Loboratory of Electrochemical Power SourcesBulgarian Academy of SciencesSofiaBulgaria

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