TAILIEUCHUNG - Effect of mixed additives on lead–acid battery electrolyte

This paper describes the corrosion behaviour of the positive and negative electrodes of a lead–acid battery in 5 M H2SO4 with binary additives such as mixtures of phosphoric acid and boric acid, phosphoric acid and tin sulphate, and phosphoric acid and picric acid. The effect of these additives is examined from the Tafel polarisation curves, double layer capacitance and percentage of inhibition efficiency. A lead salt battery has been fabricated replacing the binary mixture with an alternative electrolyte and the above electrochemical parameters have been evaluated for this lead salt battery. The results are explained in terms of Hþ. | ELSEVIER Journal of Power Sources 113 2003 382-387 Effect of mixed additives on lead-acid battery electrolyte Arup Bhattacharya Indra Narayan Basumallick Electrochemical Laboratory Department of Chemistry University of Visva-Bharati Santiniketan 731235 India Abstract This paper describes the corrosion behaviour of the positive and negative electrodes of a lead-acid battery in 5 M H2SO4 with binary additives such as mixtures of phosphoric acid and boric acid phosphoric acid and tin sulphate and phosphoric acid and picric acid. The effect of these additives is examined from the Tafel polarisation curves double layer capacitance and percentage of inhibition efficiency. A lead salt battery has been fabricated replacing the binary mixture with an alternative electrolyte and the above electrochemical parameters have been evaluated for this lead salt battery. The results are explained in terms of H ion transport and the morphological change of the PbSO4 layer. 2002 Elsevier Science . All rights reserved. Keywords Corrosion Picric acid Phosphoric acid Boric acid Tin sulphate Lead-acid battery 1. Introduction During the last two decades the lead-acid battery has been widely used in battery driven vehicles and for storing electrical energy from non-conventional sources. In spite of rapid improvement in its performance and design there remain some problems of the battery which are yet to be solved. These problems have drawn the attention of the battery scientists which has resulted in an annual publication of more than 150 papers in the scientific journals and a good number of patents. The use of additives in the electrolyte is one of the approaches which offers improvement of the battery without much alteration of other factors. The major problem lies with selecting a suitable additive which is chemically thermally and electrochemically stable in highly corrosive environment. Among the additives used so far the most widely investigated is H3PO4 1 2 which has been reported

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