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US 6,949,315 B1Granted
Shutdown separators with improved properties
OwnerGarrin Samii, Abbas M Samii +1inventors
InventorsGarrin Samii, Abbas M Samii, Dave C. Veno
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OwnerGarrin Samii, Abbas M Samii +1inventors
InventorsGarrin Samii, Abbas M Samii, Dave C. Veno
Estimating the term…
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 is made of UHMWPE having a weight-average molecular weight of 1×106 or more and an inert filler. A second microporous polyolefin battery separator has a shutdown temperature of between 95 and 110 degrees C. and a melt integrity of more than 165 degrees C. It is made from an UHMWPE having a weight-average molecular weight of 1×106 or more, a shutdown (LMWPE) having a weight-average molecular weight of 4500 or less and an inert filler. Both membranes have a thickness of 5–75 microns, a porosity of 30–95%, an air permeability of 1–200 sec/10 cc, an average pore diameter of 0.001 to 1 micron and puncture strength of more than 300 grams/25 {circumflex over (l)}¼ m.
A battery separator comprising a microporous membrane having a thickness of 5 to 175 μm, and a porosity of between 30% and 95%, said microporous membrane comprised of between 85% to 95% by weight of an UHMW polyethylene having a minimum average molecular weight of 1×106, and between 5% and 15% by weight of a TiO2 particulate filler with an average particle size diameter of between 0.001 μm and 1 μm.
A battery separator comprising a microporous membrane having a thickness of 5 to 175 μm, and a porosity of between 30% and 95%, said microporous membrane consisting of between 85% to 95% by weight of an UHMW polyethylene having a minimum average molecular weight of 1×106, and between 5% and 15% by weight of a TiO2 particulate filler with an average particle size diameter of between 0.001 μm and 1 μm.
Dependencies are inferred from the claim text.