Abstract
The influence of standing on positive lead/acid battery active mass was investigated by laboratory scale preparation of two different types of active masses — one containing tribasic lead sulfate (=3BS), another containing tetrabasic lead sulfate (=4BS) — and subsequent monitoring of the changes in phase composition and morphology as a function of stand time. The characterization methods used were powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). In order to ensure the applicability of the results from laboratory tests to real lead/acid battery processes the same phase composition and morphology monitoring was performed with a 3BS paste from a lead/acid battery factory. A continuous recrystallization process and a clear growth of crystal size were observed both in the laboratory and factory 3BS pastes during standing. In the 4BS paste the crystal growth due to rearrangement of the crystals finished after one hour of standing.
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