Separator for redox flow battery and redox flow battery

• US 9,147,903 B2
• Filed: 11/07/2011
• Issued: 09/29/2015
• Est. Priority Date: 04/18/2011
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Hee-Tak
• Primary Examiner(s): Ridley, Basia
• Assistant Examiner(s): WILMOT, CAITLIN M
• Application Number:
  US13/290,916
• Publication Number:
  US 20120263990A1
• Time in Patent Office: 1,422 Days
• Field of Search: 429 50- 52, 429 96-100, 429129-147, 429247-255
• US Class Current: 1/1
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H01M 2008/1095 Fuel cells with polymeric electrolytes
• CPC Class Codes: H01M 2300/0082 Organic polymers
• CPC Class Codes: H01M 2300/0094 in the form of layered products, e.g. coatings
• CPC Class Codes: H01M 8/1023 having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes
• CPC Class Codes: H01M 8/1053 consisting of layers of polymers with at least one layer being ionically conductive
• CPC Class Codes: H01M 8/1067 characterised by their physical properties, e.g. porosity, ionic conductivity or thickness
• CPC Class Codes: H01M 8/188 by recharging of redox couples containing fluids; Redox flow type batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A separator for a redox flow battery and a redox flow battery including the same, and the separator includes a cation conductive film and an anion conductive film disposed on either side of the cation conductive film.

Claims

1. A separator for a redox flow battery, comprising:

a cation conductive film; and

an anion conductive film having a thickness of 5 nm to 100 nm on both sides of the cation conductive film.

2. The separator of claim 1, wherein the anion conductive film comprises an anion conductive polymer having a cation comprising N.

3. The separator of claim 2, wherein the cation of the anion conductive polymer further comprises a pyridinium group, a pyrrolidinium group, an ammonium group, an imidazolium group, or a combination thereof.

4. The separator of claim 1, wherein the anion conductive film comprises an anion conductive polymer, and a cation of the anion conductive polymer comprises a pyridinium group, a pyrrolidinium group, an ammonium group, an imidazolium group, or a combination thereof.

5. The separator of claim 1, wherein the anion conductive film comprises an anion conductive polymer of poly(4-vinyl pyridinium chloride), poly(2-vinyl pyridinium chloride), poly(styrene-b-2-vinylpyridinium chloride), poly(vinyl pyrrolidinium chloride), polydiaryldimethylammoniumchloride, poly(1-methyl-4-vinylpyridinium bromide), poly(methacryloyloxyethyltriethylammoniumbromide), poly(diallylammoniumchloride), poly(diallylammoniumchloride), poly(4-vinyl pyridine), poly(2-methyl-5-vinylpyridine), or a combination thereof.

6. The separator of claim 1, wherein the cation conductive film comprises a cation conductive polymer having a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, or a cation exchange group of a derivative thereof at the side chain.

7. The separator of claim 1, wherein the cation conductive film has a thickness in a range from 20 μ

m to 200 μ

m.

8. A redox flow battery comprising;

an electrode assembly comprising a separator and positive and negative electrodes respectively positioned at both sides of the separator, the separator comprising a cation conductive film, and an anion conductive film having a thickness of 5 nm to 100 nm on both sides of the cation conductive film;

a positive electrode supplier configured to supply a positive active material liquid to the positive electrode; and

a negative electrode supplier configured to supply a negative active material liquid to the negative electrode.

9. The redox flow battery of claim 8, wherein the positive active material is +5-valent to +4-valent vanadium-based compound.

10. The redox flow battery of claim 8, wherein the positive active material is (VO₂)₂SO₄, VO(SO₄), or a combination thereof.

11. The redox flow battery of claim 8, wherein the positive active material liquid comprises a mixed solvent of sulfuric acid and water.

12. The redox flow battery of claim 8, wherein the positive active material liquid has a concentration of the positive active material in a range from 1M to 10M.

13. The redox flow battery of claim 8, wherein the negative active material is a +2-valent to +3-valent vanadium-based compound.

14. The redox flow battery of claim 8, wherein the negative active material is VSO₄, V₂(SO₄)₃, or a combination thereof.

15. The redox flow battery of claim 8, wherein the negative active material liquid comprises a mixed solvent of sulfuric acid and water.

16. The redox flow battery of claim 8, wherein the negative active material liquid has a concentration of the negative active material in a range from 1M to 10M.