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US 11,239,532 B2Granted
Battery separators and related methods
AssigneeCelgard, LLC
InventorsLie Shi, Christopher L. Cowger, Heba K. Botros
Life of this patent
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Abstract
Battery separators and methods are disclosed. The battery separator may be used in a lithium battery. The separator may include a microporous membrane laminated to a coated nonwoven. The coating may contain a polymer and optionally, a filler or particles. The methods may include the steps of: unwinding the microporous membrane and the nonwoven, laminating the nonwoven and microporous membrane, and coating the nonwoven before or after lamination.
Claims8
A battery separator for a lithium battery comprising:
- at least one microporous polyolefinic membrane,
- at least one nonwoven layer on at least one side of said microporous membrane, said nonwoven layer being bonded to said microporous membrane,
- wherein said nonwoven layer including comprises (1) at least one ferroelectric polymer selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polytetraethylene glycol diacrylate, and blends containing the foregoing, and (2) polymeric fibers selected from the group of:
- polytrimethylene terephthalate (PTT) fibers, PTT co-polymer fibers, and blends thereof,
- wherein said microporous membrane has a porosity in the range of about 20-80%,
- wherein said microporous membrane has an average pore size in the range of about 0.02 to 2 microns,
- wherein said microporous membrane has a Gurley Number in the range of about 15 to 150 sec.
4 more elements
Dependencies are inferred from the claim text.