Tin-clad substrates for use as current collectors, batteries comprised thereof and methods for preparing same
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United States of America Patent
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Jun 24, 2003
Issued Date -
N/A
app pub date -
Dec 7, 2000
filing date -
Mar 15, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a current collector for a battery which comprises a lead or lead alloy substrate and a thin cladding of tin, batteries utilizing such a current collector and methods for manufacturing such batteries. Preferably the tin cladding is composed of substantially pure tin and the concentration of the tin cladding relative to the weight of the current collector (i.e., the combined weight of the substrate and cladding) is less than 4% by weight. The tin cladding forms a noncontinuous layer over the outer surface of the substrate such that there are interspersed regions of lead and tin at the current collector surface. Batteries utilizing such current collectors exhibit marked improvement in performance compared to similar cells composed of tin alloys. In particular, batteries using current collectors of the present design offer superior cycle life and shelf life performance.
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