Composition of a nickelate composite cathode for a fuel cell

Patent metadata

Field	Value
Publication number	US-10115973-B2
Application number	US-201615175913-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Oct 28, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

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 (LnuM1vM2s)n+1(Ni1-tNt)nO3n+1-A1-xBxOy—CwDzCe(1-w-z)O2-δ, wherein A and B may be rare earth metals excluding ceria.

First claim

We claim:

1. A method of inhibiting the formation of a lanthanide oxide phase in a fuel cell having a cathode comprising a lanthanide nickelate, said method comprising:
forming the cathode from a composition comprising a lanthanide nickelate and a second oxide material which adsorbs an oxide formed from the lanthanide,
wherein said lanthanide nickelate comprises 50-70% of the cathode by weight, and
wherein the composition has a general formula of:
(Ln u M1 v M2 s ) n+1 (Ni 1-t ) n O 3n+1 -A 1-x B x O y -C w D z Ce (1-w-z) O 2-δ ,

where Ln is a rare earth metal, 0<u≤1, M1 is a rare earth metal different from Ln, 0≤v<1, M2 is an alkaline earth metal, 0<s<0.3, 0.9≤u+v+s<1.1, N is one or more transitions metals, 0≤t≤0.5, 1≤n≤3, A is a rare earth metal except for Ce, B is a rare earth metal which is both different from A and exclusive of Ce, 0<x<1, 1.5≤y≤2.0, C is rare earth metal, 0<w<0.75, D is a rare earth metal which is different from C, 0<z<0.75, and 0≤δ<0.5.

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

3. The method of claim 1 wherein the second oxide material conducts ions.

4. The method of claim 1 wherein one or element A or element B is praseodymium.

5. The method of claim 1 wherein one of element C or element D is praseodymium.

Assignees

• Lg Fuel Cell Systems Inc

Inventors

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

Classifications

• H01M4/8663

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

• H01M4/8673

  Electrically conductive fillers · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M4/8657

  layered · CPC title