This study aims to investigate the effect of an alumina-silicate
additive on the performances of the positive active material in
lead acid battery. It is found that the addition of mineral additive in
the paste before oxidation influences the composition and the capacity
of the PAM after oxidation. We observed a remarkable
improvement of the discharge capacity of the PAM for an amount of
additive ranging between 1 and 5 %. This may be explained by the
fact that at this concentration of mineral, nanosized particles of
PbO2 with amorphous character are obtained. This PAMs contain
more structural water which makes faster the diffusion of the
proton through the gel zones. In addition, the mineral additive with
its high porosity facilitates the transport of the electrolyte
throughout the positive active mass. The use of this mineral at the
industrial scale could be of great interest in the technology of lead
acid battery.