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Contribution to the improvement of VRLA batteries for cycling applications

Abstract : The perfonnances and life of the VRLA battery for cycling application were improved by applying a mechanical pressure on the e1ectrode stack with help of a new separator (AJS). The mechanical properties of AJS allow the transfer of a mechanical pressure to the electrodes throughout the cell life that limits the free space. Thus, while the negative active material is compacted, the positive active material develops a structure with a skeleton robust against discharge and large voids allowing a better utilisation over the whole plate thickness. The positive grid corrosion decreases and the mechanical stack stabilisation allowed by AJS reduces dramatically the effects associated with positive grid growth. The association of phosphoric acid with AJS improves the cell perfomance at high discharge currents for a while provided the cells are adequately charged. With cycling, the effect of phosphoric acid disappears. The oxygen recombination in AJS cells is slow but sufficient for cycling life over 1000 cycles. The oxygen transfer takes place across the gas space and through gas channels in the separator that are freed of their electrolyte by an oxygen overpressure.
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https://hal.univ-lorraine.fr/tel-01746862
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Marion Perrin. Contribution to the improvement of VRLA batteries for cycling applications. Other. Université Henri Poincaré - Nancy 1, 2001. English. ⟨NNT : 2001NAN10185⟩. ⟨tel-01746862⟩

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