Patent ID: 7300718

Claim:
An electrolyte-electrode joined assembly comprising a solid electrolyte which is interposed between a first electrode and a second electrode, said first electrode functioning as one of an anode and a cathode, and said second electrode functioning as the other of said anode and said cathode, wherein said first electrode is a porous member which has pores for allowing a gas to flow therethrough and which has recesses and projections disposed at an end surface on a side facing said solid electrolyte, wherein said pores have opening diameters of 1 to 20 μm in a two-dimensional cross section; a flattening layer is provided between said first electrode and said solid electrolyte, said recesses being filled therewith, said projections being buried therewith, and said flattening layer having a flat end surface on a side facing said solid electrolyte; said flattening layer has a thickness which is set to be an average value of said opening diameters of said pores in said two-dimensional cross section, wherein said flattening layer has a thickness of 1 to 20 μm and; and said flattening layer has a porosity which is smaller than that of said first electrode.