Overcharge protection for electrochemical cells
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United States of America Patent
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Issued Date -
Mar 29, 2007
app pub date -
Sep 14, 2006
filing date -
Sep 26, 2005
priority date (Note) -
Abandoned
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Abstract
The invention relates to an improvement in a cell which is normally susceptible to damage from overcharging comprised of a negative electrode, a positive electrode, and an electrolyte comprised of an overcharge protection salt carried in a carrier or solvent. Representative overcharge protection salts are embraced by the formula: M.sub.aQ where M is an electrochemically stable cation selected from the group consisting of alkali metal, alkaline earth metal, tetraalkylammonium, or imidazolium groups, and Q is a borate or heteroborate cluster and a is the integer 1 or 2.
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