Microlayer membranes, improved battery separators, and methods of manufacture and use
AssigneeCelgard, LLC
InventorsKang Karen Xiao, Eric Joseph Penegar, Takahiko Kondo, Robert Nark, Eric Robert White, Xiaomin Zhang, Kristoffer K. Stokes
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Abstract
In accordance with at least selected embodiments, a battery separator or separator membrane comprises one or more co-extruded multi-microlayer membranes optionally laminated or adhered to another polymer membrane. The separators described herein may provide improved strength, for example, improved puncture strength, particularly at a certain thickness, and may exhibit improved shutdown and/or a reduced propensity to split.
Claims6
A battery separator for a lithium battery comprising:
- at least one dry-process microporous separator membrane or sub-membrane comprising a plurality of co-extruded porous polymer microlayers or nanolayers,
- at least one other dry-process microporous polymer membrane;
- wherein the at least one dry-process microporous separator membrane or sub-membrane and the at least one other dry-process microporous polymer membrane are laminated to each other or to a microporous polymer membrane.
A battery separator for a lithium battery comprising:
- at least one microporous separator membrane or sub-membrane comprising a plurality of co-extruded porous polymer microlayers or nanolayers,
- wherein the at least one microporous separator membrane or sub-membrane is laminated to a microporous polymer membrane,
- wherein at least one of said separator membranes or sub-membranes of polymer microlayers or nanolayers has at least three microlayers or nanolayers.
A battery separator for a lithium battery comprising:
- at least one microporous separator membrane or sub-membrane comprising a plurality of co-extruded porous polymer microlayers or nanolayers,
- wherein the at least one microporous separator membrane or sub-membrane is laminated to a microporous polymer membrane,
- wherein at least one of said separator membranes or sub-membranes of polymer microlayers or nanolayers has at least three microlayers or nanolayers, and
- wherein at least one of said separator membranes or sub-membranes of polymer microlayers or nanolayers is made of one or more polyolefins.
Dependencies are inferred from the claim text.