EFFECT OF PERFLUOROALKYLSULFONATE ON THE DISCHARGE BEHAVIOR OF PBO2 ELECTRODES IN SULFURIC-ACID-SOLUTION

Amine perfluoroalkylsulfonate (FC-99) is seen as a prospective additiv e for lead/acid battery positive plates. Accordingly, its effect on th e electrochemical behaviour of PbO2 electrodes in 5 M H2SO4 is studied by cyclic voltammetry, charge/discharge cycling and scanning electron microscopy. For sulfuric acid solution with FC-99, the discharge capa city of the PbO2 electrode is increased, but the cycle life is reduced . These effects are attributed to adsorption of FC-99 on the electrode surface. The latter changes the morphology of the PbO2 crystals to en large the electrode surface area, but weakens the contact between the positive active material and the substrate metal.