Ion exchanging membrane, method for manufacturing the same, and energy storage device comprising the same

Patent metadata

Field	Value
Publication number	US-10396385-B2
Application number	US-201816079214-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 31, 2017
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

The present invention relates to an ion exchange membrane, a method for manufacturing the same, and an energy storage device including the same, and the ion exchange membrane includes a porous support including a plurality of pores and an ion conductor filling the pores of the porous support, in which the porous support includes micropores having a size of 31 to 1000 μm. The ion exchange membrane may achieve high energy efficiency in the case of being applied to an energy storage device such as a vanadium redox inflow battery due to high charge/discharge cycle durability, high ion-conductivity, and excellent chemical and thermal stability.

First claim

The invention claimed is:

1. An ion exchange membrane comprising:
a porous support including a plurality of pores; and
an ion conductor filling the pores of the porous support,
wherein the porous support includes micropores having a size of 31 to 1000 μm, and wherein the micropores having a size of 31 to 1000 μm constitute 1 to 20% of the total volume of the plurality of pores.

2. The ion exchange membrane of claim 1 , wherein a porosity of the porous support is 45% or higher.

3. The ion exchange membrane of claim 1 , wherein a thickness of the porous support is 1 to 200 μm.

4. The ion exchange membrane of claim 1 , wherein the ion conductor is contained with 30 to 70 wt % with respect to the total weight of the ion exchange membrane.

5. The ion exchange membrane of claim 1 , further comprising:
an ion conductor layer located on one surface or both surfaces of the porous support,
wherein a thickness of the ion conductor layer on one surface is 1 to 30 μm.

6. The ion exchange membrane of claim 5 , wherein the thickness of the ion conductor layer on one surface is 1 to 50 length % with respect to the total thickness of the ion exchange membrane.

7. The ion exchange membrane of claim 1 , wherein the porous support is formed of a plurality of fibers randomly oriented.

8. A method for manufacturing the ion exchange membrane of claim 1 comprising:
preparing a porous support including a plurality of pores; and
filling an ion conductor in the pores of the porous support,
wherein the porous support includes micropores having a size of 31 to 1000 μm, and wherein the micropores having a size of 31 to 1000 μm constitute 1 to 20% of the total volume of the plurality of pores.

9. The method for manufacturing the ion exchange membrane of claim 8 , wherein the preparing of the porous support is performed by any one method selected from the group consisting of carding, garneting, air-laying, wet-laying, melt blowing, spunbonding, and stitch bonding.

10. The method for manufacturing the ion exchange membrane of claim 8 , wherein the filling of the ion conductor in the pores of the porous support includes
preparing the ion conductor in a sheet shape by coating, and melt-impregnating the sheet-shaped ion conductor into the pores of the porous support.

11. The method for manufacturing the ion exchange membrane of claim 10 , wherein the melt-impregnating is performed at 150 to 240° C. in a pressure of 1 to 20 MPa.

12. An energy storage device comprising the ion exchange membrane according to claim 1 .

13. The energy storage device of claim 12 , wherein the energy storage device is a fuel cell.

14. The energy storage device of claim 12 , wherein the energy storage device is a redox flow battery.

Assignees

• Kolon Inc

Inventors

• Lee Eun-Su
• Lee Dong-Hoon
• Kim Na-Young
• Yum Seung-Jib

Classifications

• H01M8/18

  Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells · CPC title

• H01M8/1053

  consisting of layers of polymers with at least one layer being ionically conductive · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M8/0245

  in the form of layered or coated products · CPC title

• H01M8/0241

  Composites · CPC title