Dendrite preventing separator for secondary lithium batteries
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United States of America Patent
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Jun 27, 1995
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N/A
app pub date -
Nov 17, 1993
filing date -
Nov 17, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Dendrites are prevented from shorting a secondary lithium battery by use of a first porous separator such as porous polypropylene adjacent the lithium anode that is unreactive with lithium and a second porous fluoropolymer separator between the cathode and the first separator such as polytetrafluoroethylene that is reactive with lithium. As the tip of a lithium dendrite contacts the second separator, an exothermic reaction occurs locally between the lithium dendrite and the fluoropolymer separator. This results in the prevention of the dendrite propagation to the cathode.
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