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
Life of this patent
Estimating the term…
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.
Claims13
A battery separator for a lithium battery comprising:
- at least one dry-process microporous polymer membrane comprising a plurality of co-extruded porous polymer microlayers with a thickness of less than 2 microns;
- and
- at least two other dry-process microporous polymer membranes, wherein
- the at least one dry-process microporous polymer membrane comprising a plurality of co-extruded porous polymer microlayers with a thickness of less than 2 microns and the at least two other dry process microporous polymer membranes are laminated to one another.
A battery separator comprising one or more dry-process microporous polymer co-extruded multi-microlayer-membranes with the microlayers having a thickness of less than 2 microns, wherein
- the one or more dry-process microporous polymer co-extruded multi-microlayer membranes with microlayers having a thickness of less than 2 microns are laminated to at least two other dry-process polymer membranes, which may be a dry-process microporous polymer co-extruded multi-microlayer-membranes with microlayers having a thickness of less than 2 microns, and
- wherein the battery separator provides at least one of the following:
- improved strength in comparison to a conventional trilayer membrane, improved shutdown in comparison to a conventional trilayer membrane, and a reduced propensity to split in comparison to a conventional trilayer membrane.
A separator membrane comprises one or more dry-process co-extruded multi-microlayer polymer membranes laminated to at least two other dry-process polymer membranes, which may be another dry-process co-extruded multi-microlayer polymer membrane, wherein
- the separator membrane exhibits at least one of the following:
- improved strength in comparison to a conventional trilayer membrane, improved puncture strength in comparison to a conventional trilayer membrane, improved shutdown in comparison to a conventional trilayer membrane, and a reduced propensity to split in comparison to a conventional trilayer membrane.
Dependencies are inferred from the claim text.