Electrolyte layer-anode composite member for fuel cell and method for producing the same

Patent metadata

Field	Value
Publication number	US-2018205105-A1
Application number	US-201615743289-A
Country	US
Kind code	A1
Filing date	Jul 8, 2016
Priority date	Jul 17, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

An electrolyte layer-anode composite member for a fuel cell includes a solid electrolyte layer containing an ionically conductive metal oxide M 1 , a first anode layer containing an ionically conductive metal oxide M 2 and nickel oxide, and a second anode layer interposed between the solid electrolyte layer and the first anode layer and containing an ionically conductive metal oxide M 3 and nickel oxide. A volume content Cn 1 of the nickel oxide in the first anode layer and a volume content Cn 2 of the nickel oxide in the second anode layer satisfy the relation Cn 1 <Cn 2.

First claim

1 . An electrolyte layer-anode composite member for a fuel cell, comprising:
a solid electrolyte layer containing an ionically conductive metal oxide M 1 ; a first anode layer containing an ionically conductive metal oxide M 2 and nickel oxide; and a second anode layer interposed between the solid electrolyte layer and the first anode layer and containing an ionically conductive metal oxide M 3 and nickel oxide, wherein a volume content Cn 1 of the nickel oxide in the first anode layer and a volume content Cn 2 of the nickel oxide in the second anode layer satisfy a relation Cn 1 <Cn 2 .

2 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 ,
wherein the Cn 1 is 40% to 80% by volume, and the Cn 2 is 50% to 90% by volume.

3 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 ,
wherein the solid electrolyte layer has a thickness Te of 3 to 50 μm, and (T 1 +T 2 )/Te, which is a ratio of a total thickness of a thickness T 1 of the first anode layer and a thickness T 2 of the second anode layer to the thickness Te, is 10 or more.

4 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 ,
wherein the metal oxide M 1 has a perovskite crystal structure represented by A 1 B 1 O 3 , A 1 site contains at least one group 2 element, and B 1 site contains at least one of cerium and zirconium and a rare-earth element.

5 . The electrolyte layer-anode composite member for a fuel cell according to claim 4 ,
wherein the metal oxide M 1 is at least one selected from the group consisting of compounds represented by
BaCe 1-a1 Y a1 O 3-δ   formula (1-1):

(where 0<a1≤0.5, and δ is an oxygen deficiency),
BaZr 1-b1 Y b1 O 3-δ   formula (2-1):

(where 0<b1≤0.5, and δ is an oxygen deficiency), and
BaZr 1-c1-d1 Ce c1 Y d1 O 3-δ   formula (3-1):

(where 0<c1<1, 0<d1≤0.5, and δ is an oxygen deficiency).

6 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 ,
wherein the metal oxide M 2 has a perovskite crystal structure represented by A 2 B 2 O 3 , A 2 site contains at least one group 2 element, and B 2 site contains at least one of cerium and zirconium and a rare-earth element.

7 . The electrolyte layer-anode composite member for a fuel cell according to claim 6 ,
wherein the metal oxide M 2 is at least one selected from the group consisting of compounds represented by
BaCe 1-a2 Y a2 O 3-δ   formula (1-2):

(where 0<a2≤0.5, and δ is an oxygen deficiency),
BaZr 1-b2 Y b2 O 3-δ   formula (2-2):

(where 0<b2≤0.5, and δ is an oxygen deficiency), and
BaZr 1-c2-d2 Ce c2 Y d2 O 3-δ   formula (3-2):

(where 0<c2<1, 0<d2≤0.5, and δ is an oxygen deficiency).

8 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 ,
wherein the metal oxide M 3 has a perovskite crystal structure represented by A 3 B 3 O 3 , A 3 site contains at least one group 2 element, and B 3 site contains at least one of cerium and zirconium and a rare-earth element.

9 . The electrolyte layer-anode composite member for a fuel cell according to claim 8 ,
wherein the metal oxide M 3 is at least one selected from the group consisting of compounds represented by
BaCe 1-a3 Y a3 O 3-δ   formula (1-3):

(where 0<a3≤0.5, and δ is an oxygen deficiency),
BaZr 1-b3 Y b3 O 3-δ   formula (2-3):

(where 0<b3≤0.5, and δ is an oxygen deficiency), and
BaZr 1-c3-d3 Ce c3 Y d3 O 3-δ   formula (3-3):

(where 0<c3<1, 0<d3≤0.5, and δ is an oxygen deficiency).

10 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 , wherein the metal oxide M 1 contains zirconium dioxide doped with at least one selected from the group consisting of calcium, scandium, and yttrium.

11 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 , wherein the metal oxide M 2 contains zirconium dioxide doped with at least one selected from the group consisting of calcium, scandium, and yttrium.

12 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 , wherein the metal oxide M 3 contains zirconium dioxide doped with at least one selected from the group consisting of calcium, scandium, and yttrium.

13 . The electrolyte layer-anode composite member for a fuel cell according to claim 1 , wherein the nickel oxide contained in at least one of the first anode layer and the second anode layer is at least partially reduced to metal nickel.

14 . A method for producing an electrolyte layer-anode composite member for a fuel cell, comprising:
a first step of preparing
a solid electrolyte layer material containing an ionically conductive metal oxide M 1 ,
an anode material A containing an ionically conductive metal oxide M 2 and a nickel compound N 1 , and
an anode material B containing an ionically conductive metal oxide M 3 and a nickel compound N 2 ;
a second step of forming a laminate of a precursor layer of a first anode layer containing the anode material A, a precursor layer of a second anode layer containing the anode material B, and a precursor layer of a solid electrolyte layer containing the solid electrolyte layer material, the precursor layers being deposited on one another in this order; and a third step of firing the laminate to form the first anode layer, the second anode layer, and the solid electrolyte layer, wherein a volume content Cn 1 of the nickel oxide in the first anode layer and a volume content Cn 2 of the nickel oxide in the second anode layer satisfy a relation Cn 1 <Cn 2 .

15 . The method for producing an electrolyte layer-anode composite member for a fuel cell according to claim 14 , further comprising a fourth step of at least partially reducing the nickel oxides contained in the first anode layer and the second anode layer.

16 . A fuel cell comprising:
the electrolyte layer-anode composite member according to claim 1 ; a cathode; an oxidant channel for supplying an oxidant to the cathode; and a fuel channel for supplying a fuel to the anode.

Assignees

• Sumitomo Electric Industries

Inventors

• Takeuchi Hisao
• Matsuura Takashi
• Mizuhara Naho
• Hiraiwa Chihiro
• Awazu Tomoyuki
• Majima Masatoshi

Classifications

• H01M4/8668

  Binders · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/1253 Primary

  the electrolyte containing zirconium oxide · CPC title

• H01M8/126

  the electrolyte containing cerium oxide · CPC title

• H01M2004/8689

  Positive electrodes · CPC title