Freestanding microporous separator including a gel-forming polymer
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United States of America Patent
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Jul 1, 2003
Grant Date -
Jan 3, 2002
app pub date -
Feb 5, 2001
filing date -
Feb 4, 2000
priority date (Note) -
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Abstract
A freestanding battery separator includes a microporous polymer web with passageways that provide overall fluid permeability. The polymer web preferably contains UHMWPE and a gel-forming polymer material. The structure of or the pattern formed by the gel-forming polymer material and wettability of the UHMWPE polymer web result in a reduction of the time required to achieve uniform electrolyte distribution throughout the lithium-ion battery. In a first embodiment, the gel-forming polymer material is a coating on the UHMWPE web surface. In a second embodiment, the gel-forming polymer material is incorporated into the UHMWPE web while retaining overall fluid permeability. Both embodiments produce hybrid gel electrolyte systems in which gel and liquid electrolyte co-exist.
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