Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 15, Pages 6567-6572Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.03.050
Keywords
Lead-antimony alloys; Lead-acid batteries; Cellular/dendritic transition; Electrochemical impedance spectroscopy
Funding
- FAEPEX-UNICAMP
- CNPq (The Brazilian Research Council)
- FAPESP (The Scientific Research Foundation of the State of Sao Paulo, Brazil)
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The aim of this article is focused on a comparative experimental study of the electrochemical feature of as-cast Pb-2.2 wt.% Sb alloy with cellular/dendritic transition for applications in the manufacturing of lead-acid battery parts. A water-cooled unidirectional solidification system is used to obtain the alloy samples. Electrochemical impedance spectroscopy (EIS) plots, potentiodynamic polarization curves and equivalent circuit analysis are used to evaluate corrosion resistance in a 0.5 M H(2)SO(4) solution at 25 degrees C. The cellular Pb-2.2 wt.% Sb alloy is found to have a current density which is of about 3 times lower than that of the dendritic Pb-2.2 wt.% Sb alloy. The Pb-2.2 wt.% Sb alloy has lower current density than both the Pb-1 wt.% Sb and the Pb-6.6 wt.% Sb alloys evidencing its potential for application as positive grid material in lead-acid batteries. It is also verified that a conventional casting with low cooling rate of about 0.6 degrees Cs(-1) produces coarser cellular spacings which is more appropriate for the manufacturing of the Pb-2.2 wt.% Sb alloys grids due to its corresponding electrochemical behavior. (C) 2011 Elsevier B.V. All rights reserved.
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