Ceramic-modified, acid-scavenging polyolefin separators
AssigneeAmtek Research International LLC
InventorsWeston J. Wood, Richard W. Pekala
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Abstract
The present disclosure relates to the formation of a freestanding. microporous polyolefin membrane that exhibits both high temperature dimensional stability and acid-scavenging capability. Such membranes can include hydrotalcite particles that can contribute to high temperature dimensional stability and acid scavenging. Such membranes can be used to improve the manufacturability, performance (e.g., cycle life), and safety of energy storage devices such as lithium-ion batteries.
Claims22
A freestanding, microporous polymer membrane for use in an energy storage device, the freestanding, microporous polymer membrane comprising:
- a polyolefin matrix having first and second major surfaces, inorganic particles distributed within the polyolefin matrix and/or coated on one or both of the first and second major surfaces, wherein the inorganic particles comprise acid scavengers.
A freestanding, microporous polymer membrane for use in an energy storage device, the freestanding, microporous polymer membrane comprising:
- a polyolefin matrix having first and second major surfaces;
- a coating disposed on one or both of the first and second major surfaces, wherein the coating comprises inorganic particles;
- and
- an acid scavenger distributed in at least one of the polyolefin matrix or the coating,
- wherein the freestanding, microporous polymer membrane exhibits in-plane high temperature dimensional stability, and wherein the coating weight is less than 6 g/m2.
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Dependencies are inferred from the claim text.