Solid oxide electrolyte materials for electrochemical cells

Patent metadata

Field	Value
Publication number	US-2020350595-A1
Application number	US-201816754575-A
Country	US
Kind code	A1
Filing date	Oct 16, 2018
Priority date	Oct 16, 2017
Publication date	Nov 5, 2020
Grant date	—

Abstract

Materials for electrochemical cells are provided. BaZr?0.4#191Ce?0.4#191M?0.2#1910?3#191 compounds, where M represents one or more rare earth elements, are provided for use as electrolytes. PrBa?0.5#191Sr?0.5#191Co?2-x#191Fe?x#191O?5+#1916 is provided for use as a cathode. Also provided are electrochemical cells, such as protonic ceramic fuel cells, incorporating the compounds as electrolytes and cathodes.

First claim

What is claimed is:

1 . A compound having the formula BaZr 0.4 Ce 0.4 M 0.2 O 3 , where M represents one or more rare earth elements.

2 . The compound of claim 1 , having the formula BaZr 0.4 Ce 0.4 Y 0.2−x Yb x O 3 , where 0≤x≤0.2.

3 . The compound of claim 2 , where x=0.1.

4 . The compound of claim 1 , having the formula BaZr 0.4 Ce 0.4 Ho 0.2 O 3 .

5 . A cell comprising: a cathode, an anode, and a solid oxide electrolyte between the anode and the cathode, the solid oxide electrolyte comprising a compound having the formula BaZr 0.4 Ce 0.4 M 0.2 O 3 , where M represents one or more rare earth elements.

6 . The cell of claim 5 , the compound having the formula BaZr 0.4 Ce 0.4 Y 0.2−x Yb x O 3 , where 0≤x≤0.2.

7 . The cell of claim 6 , where x=0.1.

8 . The cell of claim 5 , the compound having the formula BaZr 0.4 Ce 0.4 Ho 0.2 O 3 .

9 . The cell of claim 5 , wherein the cathode comprises a strontium cobalt ferrite perovskite.

10 . The cell of claim 9 , wherein the cathode comprises PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ .

11 . The cell of claim 5 , wherein the anode comprises a cermet.

12 . A cell comprising: a cathode, an anode, and a solid electrolyte between the anode and the cathode, the cathode comprising PrBa 0.5 Sr 0.5 Co 2−x Fe x O 5+δ , where 0.4≤x≤2.

13 . The cell of claim 12 , wherein the cathode comprises an interlayer of the PrBa 0.5 Sr 0.5 Co 2−x Fe x O 5+δ and an overlayer of the PrBa 0.5 Sr 0.5 Co 2−x Fe x O 5+δ on the interlayer, wherein the overlayer has a higher porosity than the interlayer.

14 . A method of forming a bilayer cathode, the method comprising:
forming an interlayer of a cathode material on a solid electrolyte; and forming an overlayer of the cathode material on the interlayer, wherein the overlayer has a higher porosity than the interlayer.

15 . The method of claim 14 , wherein forming the interlayer of the cathode materials comprises depositing a film of the cathode material via a vapor deposition process and forming the overlayer of the cathode material comprises depositing a layer of the cathode material via a solution phase deposition process.

16 . The method of claim 14 , wherein the cathode material is a strontium cobalt perovskite.

17 . The method of claim 16 , wherein the cathode material is PrBa 0.5 Sr 0.5 Co 2−x Fe x O 5+δ , where 0.4≤x≤2.

Assignees

• Univ Northwestern
• Univ Maryland

Inventors

• Haile Sossina M
• Choi Sihyuk
• Kucharczyk Christopher James
• Liang Yangang
• Zhang Xiaohang
• Takeuchi Ichiro

Classifications

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M8/126

  the electrolyte containing cerium oxide · CPC title

• H01M8/1246 Primary

  the electrolyte consisting of oxides · CPC title

• H01M4/861

  with a gradient in the porosity · CPC title

• C01G25/02

  Oxides · CPC title