Abstract
After formation, the positive plates of lead acid batteries are washed and dried. When they are dried at temperatures above 70°C in a drying chamber oven they lose part of their energy. In this paper this phenomenon is called thermopassivation. The thermopassivation is measured by the difference between the galvanostatic discharge potential curves of the thermopassivated and unpassivated plates. The dependences of thermopassivation on the temperature of drying, hold time of the plates in solution, current density, pretreatment of thermopassivated plates in solution, and the number of charge‐discharge cycles are determined. It is concluded that the thermopassivation may be due to the semiconductor properties of the nonstoichiometric corrosion layer of the plate and its contact with the crystals of the active mass, as well as the contact of the active mass with the solution in the pores.
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