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US 12,580,214 B2Granted
Electrochemical membrane
AssigneeW. L. Gore & Associates, Inc.
InventorsJoshua Bartels, Navya Jagarlamudi
Life of this patent
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Abstract
This disclosure relates to polymer electrolyte membranes, and in particular, to a composite membrane having at least two reinforcing layers comprising a microporous polymer structure and a surprisingly high resistance to piercing. This disclosure also relates to composite membrane-assemblies and electrochemical devices comprising the composite membranes of the disclosure, and to methods of manufacture of the composite membranes.
Claims30
A composite membrane for an electrochemical device, comprising:
- a) at least two reinforcing layers, each of said at least two reinforcing layers comprising a microporous polymer structure;
- and
- b) an ion exchange material (IEM) at least partially imbibed within the microporous polymer structure of the at least two reinforcing layers and rendering the microporous polymer structure occlusive;
- wherein the composite membrane has a thickness at 0% RH of at least 10 μm;
- and
- wherein the microporous polymer structure is present in a total content of at least 15 vol % based on the total volume of the composite membrane, wherein the normalized total content of microporous polymer structure within the composite membrane is at least 3.5 μm based on the total area of the composite membrane,
- wherein the normalized total content of the microporous polymer structure within the composite membrane is calculated with the following formula:
- [
- ∑
- M
- mps
-
- 1
-
- in
-
- each
-
- reinforcing
-
- layer
- /
- A
- composite
-
- membrane
- (
- g
- ·
- m
- -
- 2
- )
- matrix
-
- skeletal
-
- density
- mps
-
- 1
- (
- g
- ·
- cm
- -
- 3
- )
- +
- ∑
- M
- mps
-
- 2
-
- in
-
- each
-
- reinforcing
-
- layer
- /
- A
- composite
-
- membrane
- (
- g
- ·
- m
- -
- 2
- )
- matrix
-
- skeletal
-
- density
- mps
-
- 2
- (
- g
- ·
- cm
- -
- 3
- )
- +
- …
- +
- ∑
- M
- mps
-
- N
-
- in
-
- each
-
- reinforcing
-
- layer
- /
- A
- composite
-
- membrane
- (
- g
- ·
- m
- -
- 2
- )
- matrix
-
- skeletal
-
- density
- mps
-
- N
- (
- g
- ·
- cm
- -
- 3
- )
- ]
- ·
- 10
- -
- 6
-
- m
- 3
- cm
- 3
- wherein mps1 is microporous polymer structure 1, mps2 is microporous polymer structure 2, mpsN is microporous polymer structure N (if there are N different types of microporous polymer structures within the composite membrane).
140 more elements
Dependencies are inferred from the claim text.