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US 10,807,878 B2Granted
Proton-conductive complex oxide and fuel cell using same as electrolyte
AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsJunji Akimoto, Naoki Hamao, Kunimitsu Kataoka
Life of this patent
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Abstract
Provided is a complex oxide that has a space group I-43d, has a high hydrogen content, contains almost no impurity phase, exhibits almost no aluminum substitution in the structure thereof, and is suitable for proton conductivity. This complex oxide is represented by a chemical formula Li7-x-yHxLa3Zr2-yMyO12 (M represents Ta and/or Nb, 3.2<x≤7−y, and 0.25<y<2) and is a single phase of a garnet type structure belonging to a cubic system, and the crystal structure thereof is a space group I-43d.
Claims4
A method for producing a complex oxide, comprising:
- an exchange step of bringing a raw material complex oxide represented by a chemical formula Li7-x-yHxLa3Zr2-yMyO2 (M represents Ta and/or Nb, 0≤x≤3.2, and 0.25<y<2) and a compound having a hydroxy group or a carboxy group into contact with each other to exchange at least some of lithium of the raw material complex oxide and hydrogen of the compound having a hydroxy group or a carboxy group,
- wherein the complex oxide is represented by a chemical formula Li7-x-yHxLa3Zr2-yMyO12 (M represents Ta and/or Nb, 3.2<x≤7−y, and 0.25<y<2) and is a single phase of a garnet type structure belonging to a cubic system,
- wherein a crystal structure thereof is a space group I-43d.
Dependencies are inferred from the claim text.