Anion exchange polymers and anion exchange membranes incorporating same
US-2017252707-A1 · Sep 7, 2017 · US
Triblock copolymer based anion exchange membranes (AEMs) as separators in electrochemical devices
US10910656B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10910656-B2 |
| Application number | US-201816052973-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 2, 2018 |
| Priority date | Aug 4, 2017 |
| Publication date | Feb 2, 2021 |
| Grant date | Feb 2, 2021 |
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Abstract
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The present disclosure is directed to triblock copolymer based anion exchange membranes (AEMs) and methods for making same. The membranes are useful as separators in electrochemical devices, such as fuel cells, electrolyzers, and redox flow batteries.
First claim
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What is claimed is: 1. An acid stable anion exchange membrane (AEM) comprising: a chloromethylated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) triblock copolymer, wherein a chloromethylation reaction yielding the chloromethylated SEBS triblock copolymer comprises chlorobenzene; and one or more functionalizing cations. 2. The acid stable AEM of claim 1 , wherein the one or more functionalizing cations comprise at least one trimethylamine (TMA) cation. 3. The acid stable AEM of claim 1 , wherein a molar ratio of styrene to (ethylene-ran-butylene) is from 30:70 to 55:45. 4. The acid stable AEM of claim 1 , wherein a perm-selectivity is at least about 70%. 5. A redox flow battery comprising the acid stable AEM of claim 1 , wherein a current efficiency of the redox flow battery is at least about 97%. 6. The acid stable AEM of claim 1 , having a chloride ion conductivity at 70° C. of less than about 30 mS/cm. 7. The acid stable AEM of claim 1 , having an ion exchange capacity of less than about 1.75 mmol/g. 8. A method for preparing an acid stable anion exchange membrane (AEM) comprising: chloromethylating a polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) triblock copolymer, wherein the chloromethylating comprises dissolving the SEBS triblock copolymer in chlorobenzene to form a mixture and allowing the mixture to react at about 80° C. for about 7 days; and functionalizing the SEBS triblock copolymer with at least one cation. 9. The method of claim 8 , wherein the functionalizing is conducted at about 30° C. and for about 2 days. 10. The method of claim 8 , wherein the at least one cation is a trimethylamine (TMA) cation. 11. The method of claim 8 , wherein a molar ratio of styrene to (ethylene-ran-butylene) is from 30:70 to 55:45.
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obtained by introduction of active groups capable of ion-exchange into compounds of the type C08J5/2231 · CPC title
of elements or alloys · CPC title
of vinyl aromatic monomers and conjugated dienes · CPC title
by recharging of redox couples containing fluids; Redox flow type batteries · CPC title
Liquid depolarisers · CPC title
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- What does patent US10910656B2 cover?
- The present disclosure is directed to triblock copolymer based anion exchange membranes (AEMs) and methods for making same. The membranes are useful as separators in electrochemical devices, such as fuel cells, electrolyzers, and redox flow batteries.
- Who is the assignee on this patent?
- Wang Zhongyang, Parrondo Javier, Ramani Vijay K, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H01M8/0221. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 02 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).