Effect of gelling on the impedance parameters of Pb/PbSO4 electrode in maintenance-free lead-acid batteries

Vinod, M. P. ; Vijayamohanan, K. (2000) Effect of gelling on the impedance parameters of Pb/PbSO4 electrode in maintenance-free lead-acid batteries Journal of Power Sources, 89 (1). pp. 88-92. ISSN 0378-7753

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0378-7753(00)00380-3

Abstract

The impedance parameters of Pb/PbSO4 electrode in 4.8 M sulfuric acid have been measured potentiostatically under open-circuit conditions over a wide range of frequencies (10-2 to 104 Hz) under both deep-discharged (state-of-charge, SoC=0) and fully charged (SoC=1) conditions. Immobilization of the electrolyte by adding sodium silicate (5 g/l) on the impedance of Pb/PbSO4 electrode shows significant difference in comparison with the flooded system. Four equivalent circuits have been formulated for overcharged and deep-discharged electrodes in gelled and flooded electrolytes, respectively. Impedance parameters are calculated using a phenomenological model, which indicates that in the case of gelled electrolytes, the electrochemical reactions are mass-transfer controlled, in contrast to the flooded electrolyte cells, where the process is known to be charge-transfer controlled. The study provides a non-destructive investigation of the effect of gelling on the electrical performance of sealed maintenance-free lead-acid batteries.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Battery; Gel; Lead-Acid; Impedance
ID Code:68882
Deposited On:07 Nov 2011 05:08
Last Modified:07 Nov 2011 05:08

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