Zone Processes at the Formation of the Lead Acid Battery Positive Plate

You are not logged in. Log in

The processes during formation at different current densities of the positivelead acid battery plates prepared with different phase compositions ofthe paste were studied. At the formation a PbO₂ zone is formed. The directionof its growth in the plate depends on the phase composition of the paste, thecurrent density, the pH of the solution, the paste density, etc. It was foundthat at formation with a high current density of the plates with high sulfationpastes, the PbO₂ zone grows in the interior of the plate first and then toits surfaces. At formation with a low current density of the plates with lowsulfation pastes this process is inverse. A diagram of chemical and electrochemicalreactions which take place in a reaction layer is presented. The directionof the PbO₂ zone growth depends on the direction of H⁺ and SO₄^2– ionflows which keep electroneutrality of the solution in the reaction layer. Whenthe H⁺ and SO₄^2– ion flows enter the reaction layer the PbO₂ zone grows inthe surface layers of the plate and vice versa, when they go out of the reactionlayer the PbO₂ zone grows first in the interior of the plate.

©1980 The Electrochemical Society, Inc.