Composition of a nickelate composite cathode for a fuel cell

Patent metadata

Field	Value
Publication number	US-2017125820-A1
Application number	US-201615175928-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 . 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:
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;
0≦x<1;
1.5≦y≦2.0;
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.

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 one of element A and element B is praseodymium.

7 . The fuel cell of claim 1 wherein one of element C and element D is praseodymium.

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

9 . 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.

10 . 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; 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 ) 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.

12 . 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.

13 . 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.

14 . 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.

15 . 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
wherein:
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;
0≦x<1; and
1.5≦y≦2.0.

16 . The fuel cell of claim 15 wherein one of element Ln and element M1 is praseodymium and element M2 is strontium.

17 . The fuel cell of claim 15 wherein:
0.25≦u≦0.75;
0.25≦v≦0.75; and
0.02≦s≦0.15.

18 . The fuel cell of claim 15 wherein:
0.25≦u≦0.75;
0.25≦v≦0.75; and
0.02≦s≦0.15.

19 . The fuel cell of claim 15 wherein:
element N is copper; and
0.02≦t≦0.30.

20 . The fuel cell of claim 15 wherein one of element A and element B is praseodymium.

21 . The fuel cell of claim 15 wherein:
0.25≦x≦0.75; and
1.8≦y≦2.0.

22 . The fuel cell of claim 15 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.

23 . The fuel cell of claim 15 , wherein said cathode comprises a nickelate composite having the general formula:
Ln 2 NiO 4 -A 1-x B x O y .

24 . The fuel cell of claim 15 , 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 wherein: 0<v<1; 0.9≦u+v<1.1.

25 . The fuel cell of claim 15 , wherein said cathode comprises a nickelate composite having the general formula:
(Ln x M1 v ) n+1 Ni n O 3n+1 -A 1-x B x O y wherein: 0<v<1; 0.9≦u+v<1.1; 1<n.

26 . The fuel cell of claim 15 , 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 wherein: 0≦v<1; 0.9≦u+v<1.1; 0<t≦0.5.

27 . The fuel cell of claim 15 , 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 wherein: 0≦v<1; 0<s<0.3; 0.9≦u+v+s<1.1; 0≦t≦0.5.

28 . 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 -C w D z Ce (1-w-z) O 2-δ
wherein:
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 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.

29 . The fuel cell of claim 28 wherein one of element Ln and element M1 is praseodymium and element M2 is strontium.

30 . The fuel cell of claim 28 wherein:
0.25≦u≦0.75;
0.25≦v≦0.75; and
0.02≦s≦0.15.

31 . The fuel cell of claim 28 wherein:
0.25≦u≦0.75;
0.25≦v≦0.75; and
0.02≦s≦0.15.

32 . The fuel cell of claim 28 wherein:
element N is copper; and
0.02≦t≦0.30.

33 . The fuel cell of claim 28 wherein one of element C and element D is praseodymium.

34 . The fuel cell of claim 28 wherein:
0.05≦w≦0.5;
0.05≦z≦0.5; and
0≦δ≦0.3.

35 . The fuel cell of claim 28 further comprising a cathode barrier

Assignees

• Lg Fuel Cell Systems Inc

Inventors

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

Classifications

• H01M4/8652 Primary

  as mixture · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M4/8817

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

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M4/8657

  layered · CPC title