Shutdown separators with improved properties

Details Shutdown separators with improved properties Shutdown separators with improved properties

2007-12-07

2010-02-16

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

C429S129000, C429S142000, C429S145000

Reexamination Certificate

active

07662518

ABSTRACT:
A microporous polyolefin battery separator membrane is extremely high in porosity, high in puncture strength, very low in shrinkage and with shutdown temperature of 130-140 degrees C. and melt integrity greater than 165 degrees C. It consists of 20-30% by weight of a UHMW polyethylene having Mw of 1×106or higher, 60-70% by weight of a HDPE having average Mw of between 200,000-500,000 and 5-15% by weight of TiO2with an average particle size of less than 0.2 microns.

REFERENCES:
patent: 5641565 (1997-06-01), Sogo
patent: 6372379 (2002-04-01), Samii et al.

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