Role of tin in the depassivation of PbCaSn alloys maintained in deep discharge conditions of lead/acid batteries
Conference
·
OSTI ID:352619
- Univ. Henri Poincare Nancy 1, Vandoeuvre (France). Lab. de Chimie du Solide Mineral
The tin content of the lead-calcium-tin alloys, used in the positive grids of the lead/acid batteries, must be controlled at a sufficient level to avoid passivation, mainly under deep discharge conditions. The passivation phenomenon is attributed to the formation of a semiconductive PbO layer, growing under a porous superficial layer of PbSO{sub 4}. Electrochemical measurements, as well as TEM and SIMS experiments have established that the PbO growth is controlled by the diffusion of O{sup {minus}{minus}} ions and that tin additions increase the conductivity of the oxide layer. This conductivity could be explained by a mechanism of percolation through a conductive oxide (tin rich oxide as SnO{sub 2}...) network as a result of tin segregation at the PbO grain boundaries.
- OSTI ID:
- 352619
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
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