Free Maintenance Lead Acid Batteries in Telecommunication Application

The free maintenance batteries used on telecommunicator applications belong to the very new models produced on that aim. Those are stationary lead acid batteries with grid type pasted. We have used alloys with a reduced content of stibium (less than 2 precentes) and an addition of Selenium (1.25%) in the producing process of the positive and negative grills of those batteries. The active mass was obtained in accordance with usual technologies. The innovation consists in the utilization of the perchloric acid salts and of the another anorganic compound named "S" - both as additions to electrolyte formation-working into ose batteries. The chemical reactions assumed for the electroformation in H2SO4 + HCl04 mxied electrolyte are the followings: Pb²⁺ + SO^2-4 PbSO4 (1) PbSO4 + 2H2O PbO2 + H SO^-4 + 3H⁺ + 2e (2) PbSO4 + 2H⁺ + 2e Pb + 2H⁺ + SO^2-4 (3) PbO2 + Pb + 4HClO4 2Pb(ClO4)2 + 2H2O (4) Pb(ClO4)2 + H2SO4 PbSO4 + 2HClO4 (5) The compound "S" added to the mixed electrolyte H2SO4 + HClO4 has the role of removing the defavorable effects which can occur as a result of the existance of th HClO4 marks into the active mass pores. The fig. 1 and 2 presents the compotament at the polarisation of the alloys used for the grill making of the free maintenace lead-acid batteries in telecommunication application.