Additives for overcharge protection in non-aqueous rechargeable lithium batteries
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United States of America Patent
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Jun 13, 2000
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N/A
app pub date -
Feb 25, 1998
filing date -
Sep 26, 1997
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Abstract
Non-aqueous rechargeable lithium batteries can be protected against overcharge abuse by incorporating small amounts of suitable additives into the electrolyte. Additives selected from the group consisting of phenyl-R-phenyl compounds wherein R is an aliphatic hydrocarbon, fluorine substituted biphenyl compounds, and 3-thiopheneacetonitrile can provide superior cycling performance along with satisfactory overcharge protection in high voltage lithium ion batteries. 2,2-diphenylpropane can be a preferred gassing agent additive in batteries equipped with electrical disconnect devices.
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