Perforated current collectors for storage batteries and electrochemical cells, having improved resistance to corrosion
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United States of America Patent
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Oct 12, 2004
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N/A
app pub date -
May 26, 2000
filing date -
May 26, 2000
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Expired
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Abstract
A process for enhancing chemical stability and corrosion resistance is described for perforated current collectors made by continuous production processes for use in electrochemical cells, including storage batteries such as lead-acid batteries. The process relies on utilizing a strip processing method, selected from the group of reciprocating expansion, rotary expansion and punching, to perforate the solid metal strip to form a grid or mesh, as a deformation treatment. The perforation-deformation treatment is followed in rapid succession by a heat-treatment to obtain a recrystallized microstructure in the current collector and optionally by quenching to rapidly reduce the temperature to below approximately 80.degree. C. The process yields an improved microstructure consisting of a high frequency of special low .SIGMA. CSL grain boundaries (>50%), exhibiting significantly improved resistance to intergranular corrosion and cracking. Perforated current collectors produced with this process from a solid lead-alloy strip exhibit superior growth and corrosion properties when employed as positive grids in a lead-acid battery.
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