Powder for solid oxide fuel cell air electrode, and method for manufacturing said powder for solid oxide fuel cell air electrode

A method of producing a powder for an air electrode in a solid oxide fuel cell, the powder having a perovskite-type single phase crystal structure represented by a following general formula:

• A11-xA2xBO3-δ,
• where the element A1 is at least one selected from the group consisting of La and Sm, the element A2 is at least one selected from the group consisting of Ca, Sr, and Ba, the element B is at least one selected from the group consisting of Mn, Fe, Co, and Ni, 0<x<1, and the δ is an oxygen deficiency amount,
• the method comprising:
• a slurry preparing step of mixing different kinds of metal compounds in a powder form each containing one of the element A1, the element A2, and the element B, with a dispersion medium, to prepare a slurry in which an average particle diameter of the metal compounds is 0.5 μm or more and 2 μm or less,
• an adding step of adding a granulating agent to the slurry,
• a drying step of removing the dispersion medium in the slurry after the adding step, to obtain a dry powder, and
• a baking step of baking the dry powder, wherein
• in the slurry subjected to the drying step, a total concentration of the different kinds of metal compounds is 10 mass % or more and below 25 mass %.