Abstract
Curing of the positive paste is the most time consuming technological procedure in the process of lead‐acid battery manufacture. During curing the following processes take place: Pb oxidation, and oxide recrystallization, grid corrosion, improvement of the paste/grid contact, and drying of the plate. When the temperature is increased and an appropriate humidity cyclogram is chosen, the curing processes are enhanced which allows the duration of the curing process to be reduced from 72 to 48h. However, temperature rise is limited to 65°C because above this temperature, a transformation reaction of to begins. Through the technology we propose for paste preparation from and , batteries were manufactured with high initial capacity and cycle life longer than that of classical plates. formation during paste preparation allows elimination of the upper temperature limit of curing. The present paper is in itself an investigation of the processes during curing of and (with ) pastes at 93°C and water vapor inlet. It was established that is transformed into large crystals which are very slowly oxidized to . That is why such plates have low initial capacity. Curing of pastes under these conditions proceeds very quickly (8–21h). Batteries manufactured with such plates have initial capacity equal to the rated one and cycle life considerably longer than that of batteries produced from pastes.
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