Abstract: The invention relates to a compound having a high conductivity for electrons, characterized in that it is of the type ABCO(x-?)Hal(y-?) with a potassium nickel fluorite structure, where x+y=4, and ? and ? lie between ?0.7 and +0.7, and wherein A comprises at least one metal selected from the group consisting of Na, K, Rb, Ca, Ba, La, Pr, Sr, Ce, Nb, Pb, Nd, Sm and Gd, and wherein B comprises at least one metal selected from the same group, and wherein C comprises at least one metal selected from the group consisting of Cu, Mg, Ti, V, Cr, Mn, Fe, Co, Nb, Mo, W and Zr and/or a metal selected from the group consisting of Pt, Ru, Ir, Rh, Pd and Ni, wherein A and B are not identical and wherein A and C are not both Nb and wherein Hal comprises at least one halogen atom selected from the group consisting of F, Cl, Br and I. The invention also describes an electrode for an electrochemical cell; a method for preparing an electrode of this type and an electrochemical cell formed with an electrode of this type.

Abstract: The invention relates to a compound having a high conductivity for electrons, characterized in that it is of the type ABCO(x-&dgr;)Hal(y-&zgr;) with a potassium nickel fluorite structure, where x+y=4, and &dgr; and &zgr; lie between −0.7 and +0.7, and wherein A comprises at least one metal selected from the group consisting of Na, K, Rb, Ca, Ba, La, Pr, Sr, Ce, Nb, Pb, Nd, Sm and Gd, and wherein B comprises at least one metal selected from the same group, and wherein C comprises at least one metal selected from the group consisting of Cu, Mg, Ti, V, Cr, Mn, Fe, Co, Nb, Mo, W and Zr and/or a metal selected from the group consisting of Pt, Ru, Ir, Rh, Pd and Ni, wherein A and B are not identical and wherein A and C are not both Nb and wherein Hal comprises at least one halogen atom selected from the group consisting of F, Cl, Br and I.

Abstract: The invention relates to a mixed oxide material with a high electron conductivity of empirical formula ABOY, where y≠3 and where A comprises at least one metal selected from Na, K, Rb, Ca, Ba, La, Pr, Sr, Ce, Nb, Pb, Nd, Sm and Gd, and B comprises at least one metal selected from the group consisting of Cu, Mg, Ti, V, Cr, Mn, Fe, Co, Nb, Mo, W and Zr, where A and B cannot both be Nb and where the compound SrVO2.5 is excluded. The material may be a perovskite-type material, in which y=3−&dgr; and &dgr;≠0, with values for &dgr; in the range from approximately −0.2 to approximately, −0.05 or in the range from +0.05 to +0.7. The material may also be a Brown-Millerite-type material, for which y=2.5−&xgr; and &xgr; has a value in the range from approximately −0.2 to approximately −0.05 or in the range from +0.05 to approximately 0.3.

Abstract: An electrode suitable for use in a fuel cell, and a fuel cell containing such an electrode, is provided by a unitary sintered porous body containing LiCoO.sub.2. The electrode is produced from a tape of LiCoO.sub.2 powder and a binder. Platelets are cut from the tape and stacked and then sintering is conducted in an atmosphere containing 60-80% air and 40-20% carbon dioxide.