Composition of a nickelate composite cathode for a fuel cell

Patent metadata

Field	Value
Publication number	US-10115974-B2
Application number	US-201615175928-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 (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. A fuel cell comprising:
an anode;
an electrolyte;
a cathode; and
a cathode current collector, wherein said cathode comprises a nickelate composite having 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:
(Ln u M1 v M2 s ) n+1 (Ni 1-t N t ) n O 3n+1 comprises approximately 50 wt % to approximately 70 wt % of the cathode;
element Ln is a rare earth metal;
0<u≤1;
element M1 is a rare earth metal different from element Ln;
0≤v≤1;
element M2 is an alkaline earth metal;
0≤s≤0.3;
0.9≤u+v+s<1.1;
1≤n;
element N is one or more transition metals;
0≤t≤0.5;
element A is a rare earth metal excluding cerium;
element B is a rare earth metal different from element A excluding cerium;
one of element A and element B is praseodymium;
0<x<1;
1.5≤y≤2.0;
element C is a rare earth metal;
element D is a rare earth metal different from element C;
one of element C and element D is praseodymium;
0<w≤0.75;
0<z≤0.75; and
0≤δ≤0.5.

2. The fuel cell of claim 1 wherein one of element Ln and element M1 is praseodymium and element M2 is strontium.

3. The fuel cell of claim 2 wherein:
0.25≤u≤0.75;
0.25≤v≤0.75; and
0.02≤s≤0.15.

4. The fuel cell of claim 1 wherein:
0.25≤u≤0.75;
0.25≤v≤0.75; and
0.02≤s≤0.15.

5. The fuel cell of claim 1 wherein:
element N is copper; and
0.02≤t≤0.30.

6. The fuel cell of claim 1 wherein:
0.05≤w≤0.5;
0.05≤z≤0.5; and
0≤δ≤0.3.

7. The fuel cell of claim 1 further comprising a cathode barrier disposed between said cathode and said electrolyte, wherein said cathode barrier comprises a co-doped ceria with a general formula:
C w D z Ce (1-w-z) O 2-δ
wherein:
element C is a rare earth metal;
0<w≤0.75;
element D is a rare earth metal different from element C;
0<z≤0.75; and
0≤δ≤0.5.

8. The fuel cell of claim 1 , wherein said cathode comprises a nickelate composite having the general formula:
Ln 2 NiO 4 -A 1-x B x O y -C w D z Ce (1-w-z) O 2-δ
wherein:
element C is a rare earth metal;
0<w<0.75;
0<z<0.75; and
0≤δ<0.5.

9. The fuel cell of claim 1 wherein said cathode comprises a nickelate composite having the general formula:
(Ln u M1 v ) 2 NiO 4 -A 1-x B x O y -C w D z Ce (1-w-z) O 2-δ
wherein:
0<v<1;
0.9≤u+v<1.1;
0<w<0.75;
0<z<0.75; and
0≤δ<0.5.

10. The fuel cell of claim 1 , wherein said cathode comprises a nickelate composite having the general formula:
(Ln u M1 v ) n+1 Ni n O 3n+1 -A 1-x B x O y -C w D z Ce (1-w-z) O 2-δ
wherein:
0<v<1;
0.9≤u+v<1.1;
1<n;
0<w<0.75;
element D is a rare earth metal different from element C;
0<z<0.75; and
0≤δ<0.5.

11. The fuel cell of claim 1 , wherein said cathode comprises a nickelate composite having the general formula:
(Ln u M1 v ) 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:
0≤v<1;
0.9≤u+v<1.1;
1≤n;
0<t≤0.5;
0<w<0.75;
0<z<0.75; and
0≤δ<0.5.

12. The fuel cell of claim 1 , wherein said cathode comprises a nickelate composite having 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
0≤v<1;
0<s<0.3;
0<w<0.75;
0<z<0.75; and
0≤δ<0.5.

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

• H01M8/12 Primary

  operating at high temperature, e.g. with stabilised ZrO2 electrolyte · CPC title

• H01M4/9033 Primary

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title

• H01M4/8652

  as mixture · CPC title

• H01M4/8657

  layered · CPC title