Composite membrane containing ion transfer polymer and method for preparing same

Patent metadata

Field	Value
Publication number	US-10418646-B2
Application number	US-201515509547-A
Country	US
Kind code	B2
Filing date	Sep 23, 2015
Priority date	Sep 23, 2014
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The present specification relates to a composite membrane containing an ion transfer polymer and a method for preparing the same.

First claim

The invention claimed is:

1. A composite membrane comprising:
a first polymer layer composed of an ion transfer polymer or composed of an ion transfer polymer and a stabilizer;
a second polymer layer provided on the first polymer layer and having an ion transfer polymer and a functional additive particle; and
a fourth polymer layer provided on a surface of the second polymer layer that is opposite to the surface on which the first polymer layer is provided,
wherein the fourth polymer layer is composed of an ion transfer polymer, or is composed of an ion transfer polymer and a stabilizer, and
the functional additive particle is at least one of a silicon element-containing particle, a graphite oxide particle, a metal particle, and a metal oxide particle,
wherein a content of the functional additive particle is 60 wt % or more and 80 wt % or less based on a total weight of the second polymer layer, and
wherein the second polymer layer is positioned within a range of 10% or more and 90% or less of a thickness of the composite membrane from an upper surface or a lower surface of the composite membrane.

2. The composite membrane of claim 1 , wherein the second polymer layer has a thickness of 60 μm or more and 150 μm or less.

3. The composite membrane of claim 1 , wherein the first polymer layer is brought into contact with the second polymer layer.

4. The composite membrane of claim 1 , further comprising:
a third polymer layer provided on a surface of the first polymer layer that is opposite to the surface on which the second polymer layer is provided,
wherein the third polymer layer has an ion transfer polymer and a functional additive particle.

5. The composite membrane of claim 4 , wherein the functional additive particle of the second polymer layer and the functional additive particle of the third polymer layer are different from each other.

6. The composite membrane of claim 4 , wherein the second polymer layer and the third polymer layer have a portion where a concentration of the functional additive particle in each thickness direction of the composite membrane is different from those of the other portions.

7. The composite membrane of claim 4 , wherein in the second polymer layer and the third polymer layer, a concentration of the functional additive particle is gradually changed in each thickness direction.

8. The composite membrane of claim 1 , wherein the functional additive particle has a diameter of 1 nm or more and 100 μm or less.

9. The composite membrane of claim 1 , wherein the silicon element-containing particle is a silicon particle, a silica particle, or a silica particle having a sulfonic acid group.

10. The composite membrane of claim 1 , wherein the metal particle or the metal oxide particle comprises at least one of Ag, Ni, Cu, Ti, Pt, and oxides thereof.

11. The composite membrane of claim 1 , wherein at least one layer of the polymer layers comprises two or more ion transfer polymers which are different from each other.

12. The composite membrane of claim 1 , wherein the ion transfer polymers comprised in adjacent polymer layers are the same.

13. The composite membrane of claim 1 , wherein the ion transfer polymer of the first and/or second polymer layer(s) comprises one or more selected from an ion exchange resin of a hydrocarbon; a fluorine-based ion resin; and an anionic resin.

14. An electrochemical cell comprising:
a negative electrode;
a positive electrode; and
the composite membrane according to claim 1 disposed between the negative electrode and the positive electrode.

15. The electrochemical cell of claim 14 , wherein the electrochemical cell is a fuel cell or a redox flow battery.

Assignees

• Lg Chemical Ltd

Inventors

• Moon Sikwon
• Noh Tae Geun
• Jeong Bong Hyun
• Min Geungi
• Lee Jeongbae
• Byun Sujin

Classifications

• H01M8/1051 Primary

  Non-ion-conducting additives, e.g. stabilisers, SiO2 or ZrO2 · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M8/188

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title