Abstract: An accelerated cyclic test for the positive electrode in lead-acid battery has been carried out for studying the effect of some additives on the behaviour of the positive active materials. Two mixed additives selected was found to be more effective, with which the capacity of the active materials was enhanced by 10-15% and the number of the charge-discharge cycles was increased from 19 to 26. The structure and electrochemical properties of the active materials have been investigated by the x-ray differaction, scanning electron microscopy and cyclic voltammetric measurements.It was shown that addition of cobalt ion increases the content of α-PbO₂,addition of phosphate makes the crystallite of the active materials finer, but addition of silicide and fibre only partly strengthens the mechanical property of the material. The effect of PO₄^3-, Co²⁺ ions on cyclic voltammetry of the lead positive electrode has been discussed as well.