Cell structure, method for manufacturing the same, and fuel cell

Patent metadata

Field	Value
Publication number	US-10424801-B2
Application number	US-201515525104-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Nov 13, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

A cell structure includes a cathode, an anode, and a protonically conductive solid electrolyte layer between the cathode and the anode. The solid electrolyte layer contains a compound having a perovskite structure and containing zirconium, cerium, and a rare-earth element other than cerium. If the solid electrolyte layer has a thickness of T, the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the cathode, ZrC/CeC, and the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the anode, ZrA/CeA, satisfy ZrC/CeC>ZrA/CeA, and ZrC/CeC>1.

First claim

The invention claimed is:

1. A cell structure comprising:
a cathode;
an anode; and
a protonically conductive solid electrolyte layer between the cathode and the anode, wherein
the solid electrolyte layer comprises a compound having a perovskite structure and containing zirconium, cerium, and a rare-earth element other than cerium, and
if the solid electrolyte layer has a thickness of T,
the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the cathode, Zr C /Ce C , and the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the anode, Zr A /Ce A , satisfy Zr C /Ce C >Zr A /Ce A , and Zr C /Ce C >1.

2. The cell structure according to claim 1 , wherein
the elemental ratio Zr C /Ce C ≥2, and
the elemental ratio Zr A /Ce A <2.

3. The cell structure according to claim 1 , wherein the compound is represented by formula (1):
A1Zr x Ce y B1 1-x-y O 3-δ

(where A1 is an alkaline earth metal element; B1 is a rare-earth element other than cerium; 0.4<x≤0.6; 0<y≤0.4; and δ is an oxygen deficiency).

4. A fuel cell comprising the cell structure according to claim 1 ,
wherein the fuel cell has an oxidant channel for supplying an oxidant to the cathode and a fuel channel for supplying a fuel to the anode.

5. A method for manufacturing a cell structure, comprising:
a first step of providing a cathode material, an anode material, and solid electrolytes, the solid electrolytes including a compound Z represented by formula (2):
A2Zr x1 Ce y1 B2 1-x1-y1 O 3-δ

(where A2 is an alkaline earth metal element; B2 is a rare-earth element other than cerium; x1/y1>1; 0.4≤x1≤1; 0≤y1≤0.5; and δ is an oxygen deficiency) and a compound C represented by formula (3):
A3Zr x2 Ce y2 B3 1-x2-y2 O 3-δ

(where A3 is an alkaline earth metal element; B3 is a rare-earth element other than cerium; x1/y1>x2/y2; 0≤x2<0.5; 0.4≤y2≤1; and δ is an oxygen deficiency);
a second step of forming the anode material into an anode shape;
a third step of depositing the compound C on a surface of the formed anode material;
a fourth step of depositing the compound Z on a surface of the deposited compound C and sintering the compounds C and Z to form a solid electrolyte layer; and
a fifth step of depositing the cathode material on a surface of the solid electrolyte layer and sintering the cathode material.

Assignees

• Sumitomo Electric Industries

Inventors

• Higashino Takahiro
• Noda Yohei
• Hiraiwa Chihiro
• Mizuhara Naho
• Tawarayama Hiromasa
• Takeuchi Hisao
• Majima Masatoshi

Classifications

• H01M8/1213

  characterised by the electrode/electrolyte combination or the supporting material · CPC title

• H01M8/12

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

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M8/02

  Details (electrodes H01M4/86 - H01M4/98) · CPC title

• H01M8/04201

  Reactant storage and supply, e.g. means for feeding, pipes · CPC title