Microporous membrane, methods for making such film, and the use of such film as battery separator film
AssigneeToray Tonen Specialty Separator Godo Kaisha
InventorsPatrick Brant, Derek W. Thurman, Daniel P. Cherney
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Abstract
Embodiments of the present invention generally relate to microporous membrane, methods for making microporous membrane, and the use of microporous membrane as battery separator film. More particularly, the invention relates to a microporous polymeric membrane including a paraxylylene polymer or copolymer, particularly in combination with a polymeric microporous membrane. The paraxylylene polymer or copolymer can be formed on or laminated to the microporous polymeric membrane.
Claims25
A microporous membrane comprising a paraxylylene polymer or copolymer.
The microporous membrane claim of 1, wherein the concentration of the paraxylylene polymer or copolymer that varies in the thickness direction of the membrane.
A microporous membrane comprising a 0.1 to 5.0 wt. % paraxylylene polymer or copolymer and a 95.0 to 99.9 wt. % of a microporous polyolefin membrane substrate, based on the weight of the membrane, wherein the paraxylylene polymer or copolymer comprises fluorine and the microporous polyolefin substrate comprises 1 wt. % to 20 wt. % of polyethylene having an Mw >1.0×106;
- and 80 wt. % to 99 wt. % of polyethylene having an Mw ≦1.0×106, based on the weight of the substrate, the membrane having a shutdown temperature of >145° C. and an MD/TD shrink ratio measured at 130° C.>0.95 and a TD heat shrinkage at 130° C.≦2.5% and MD heat shrinkage at 130° C.≦2.5.
A method for producing a microporous membrane comprising combining at least a first paraxylylene polymer or copolymer and a microporous polymeric membrane substrate.
A battery comprising an anode, a cathode, an electrolyte, and a separator situated between the anode and the cathode, the separator comprising:
- a microporous polymeric membrane comprising a paraxylylene polymer or copolymer.
Dependencies are inferred from the claim text.