Composition for solid oxide fuel cell sealant, sealant using same and method for preparing same

Patent metadata

Field	Value
Publication number	US-10615434-B2
Application number	US-201615736452-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Sep 15, 2015
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

The present specification relates to a composition for a solid oxide fuel cell sealant including P2O5, a sealant using the same and a method for manufacturing the same.

First claim

The invention claimed is:

1. A composition for a solid oxide fuel cell sealant comprising P 2 O 5 in 5 mol % to 10 mol % based on the content of the whole composition, SiO 2 in 12 mol % to 33 mol % based on the content of the whole composition, and having a softening temperature in a range of 550° C. to 700° C.

2. The composition for a solid oxide fuel cell sealant of claim 1 , further comprising one or more materials selected from the group consisting of SiO 2 , B 2 O 3 , Al 2 O 3 , ZnO, CaO, BaO and SrO.

3. The composition for a solid oxide fuel cell sealant of claim 1 , comprising SiO 2 in 12 mol % to 33 mol %, B 2 O 3 in 25 mol % to 40 mol %, the P 2 O 5 in 5 mol % to 10 mol %, ZnO in 5 mol % to 11 mol %, CaO in 5 mol % to 12 mol % and BaO in 5 mol % to 10 mol %.

4. The composition for a solid oxide fuel cell sealant of claim 1 , further comprising Al 2 O 3 in greater than 0 mol % and less than or equal to 10 mol %.

5. The composition for a solid oxide fuel cell sealant of claim 3 , further comprising SrO in greater than 0 mol % and less than or equal to 13 mol %.

6. The composition for a solid oxide fuel cell sealant of claim 3 , which has a value adding up the content of the CaO and the ZnO in a range of 5 mol % to 20 mol %.

7. The composition for a solid oxide fuel cell sealant of claim 5 , which has a value adding up the content of the BaO and the SrO in a range of 9 mol % to 18 mol %.

8. The composition for a solid oxide fuel cell sealant of claim 1 , which has a coefficient of thermal expansion value in a range of 8×10 −6 /K to 12×10 −6 /K.

9. The composition for a solid oxide fuel cell sealant of claim 1 , which has a glass transition temperature in a range of 450° C. to 600° C. after curing.

10. The composition for a solid oxide fuel cell sealant of claim 1 , which has an adhesion temperature at which viscosity of the composition for a sealant becomes 10 4 dPa·s in a range of 750° C. to 950° C.

11. The composition for a solid oxide fuel cell sealant of claim 1 , which does not include organic substances.

12. A solid oxide fuel cell sealant comprising the composition for a solid oxide fuel cell sealant of claim 1 .

13. A method for manufacturing a sealant for a solid oxide fuel cell comprising:
providing the composition for a solid oxide fuel cell sealant of claim 1 ;
melting the composition for a sealant;
preparing glass for a sealant by slowly cooling the melted composition for a sealant;
preparing powder by crushing the glass for a sealant;
preparing a product for a sealant by placing the powder in a mold and extrusion molding; and
sintering the product for a sealant.

14. A solid oxide fuel cell comprising:
a cell of a solid oxide fuel cell including a fuel electrode, an electrolyte and an air electrode;
the solid oxide fuel cell sealant of claim 12 provided on an upper surface and a lower surface of the cell of the fuel cell; and
a separator provided on an upper surface and a lower surface of the sealant.

15. A method for manufacturing a solid oxide fuel cell comprising:
preparing a cell of a solid oxide fuel cell including a fuel electrode, an electrolyte and an air electrode;
laminating the sealant for a solid oxide fuel cell of claim 12 on an upper surface and a lower surface of the cell of the solid oxide fuel cell; and
heating a laminate laminating the sealant to each of the upper surface and the lower surface of the cell of the solid oxide fuel cell.

Assignees

• Lg Chemical Ltd

Inventors

• Im Sanghyeok
• Shin Dong Oh
• Kim Jong Woo
• Choi Kwangwook

Classifications

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/0282 Primary

  Inorganic material · CPC title

• C03C8/24

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title

• C03C8/08

  containing phosphorus · CPC title

• H01M8/0286

  Processes for forming seals · CPC title