Composition of a nickelate composite cathode for a fuel cell

Patent metadata

Field	Value
Publication number	US-2017125822-A1
Application number	US-201615175913-A
Country	US
Kind code	A1
Filing date	Jun 7, 2016
Priority date	Oct 28, 2015
Publication date	May 4, 2017
Grant date	—

Abstract

In some embodiments, a solid oxide fuel cell comprising an anode, an electrolyte, cathode barrier layer, a nickelate composite cathode separated from the electrolyte by the cathode barrier layer, and a cathode current collector layer is provided. The nickelate composite cathode includes a nickelate compound and second oxide material, which may be an ion conductor. The composite may further comprise a third oxide material. The composite may have the general formula (Ln u M1 v M2 s ) n+1 (Ni 1-t N t ) n O 3n+1 -A 1-x B x O y —C w D z Ce (1-w-z) O 2-δ , wherein A and B may be rare earth metals excluding ceria.

First claim

We claim:

1 . In a fuel cell having a cathode comprising a lanthanide nickelate, a method of inhibiting the formation of a lanthanide oxide phase by forming the cathode from a composition comprising a lanthanide nickelate and a second oxide material which adsorbs an oxide formed from the lanthanide.

2 . The method of claim 1 comprising doping an A-site of the nickelate with a rare earth metal.

3 . The method of claim 2 comprising doping the A-site of the nickelate with a rare earth metal and an alkaline earth metal.

4 . The method of claim 2 comprising doping a B-site of the nickelate with one or more transition metals.

5 . The method of claim 1 comprising doping the B-site of the nickelate with one or more transition metals.

6 . The method of claim 1 wherein the lanthanide nickelate comprises praseodymium.

7 . The method of claim 1 wherein the second oxide material comprises rare earth metals with a general formula of A (1-x) B x O y , wherein element A and element B are different rare earth metals excluding cerium.

8 . The method of claim 7 wherein the second oxide material conducts ions.

9 . The method of claim 7 wherein one or element A or element B is praseodymium.

10 . The method of claim 1 wherein the second oxide material comprises rare earth metals with a general formula of (C w D z )Ce (1-w-z) O 2 , wherein element C and element D are different rare earth metals excluding cerium.

11 . The method of claim 10 , wherein the second oxide material conducts ions.

12 . The method of claim 10 wherein one of element C or element D is praseodymium.

13 . The method of claim 10 wherein the composition further comprises a third oxide material of rare earth metals with a general formula of A (1-x) B x O y , wherein element A and element B are different rare earth metals excluding cerium.

14 . The method of claim 13 wherein one of element A or element B is praseodymium.

Assignees

• Lg Fuel Cell Systems Inc

Inventors

• Jung Hwa Young
• Jung Minjae
• Liu Zhien
• Goettler Rich

Classifications

• H01M2004/8689

  Positive electrodes · CPC title

• H01M4/8817 Primary

  Treatment of supports before application of the catalytic active composition (coated porous composites H01M8/0245) · CPC title

• H01M4/8663

  Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers · CPC title

• H01M8/0236

  Glass; Ceramics; Cermets · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title