Compound having a high conductivity for electrons, electrode for an electrochemical cell which comprises this compound, method for preparing an electrode and electrochemical cell

Method for preparing an electrode for an electrochemical cell, comprising the steps of providing a suitable substrate and forming a continuous layer of a material with high conductivity for electrons on the substrate by applying a mixture of the corresponding material, one or more binders and at least one solvent, followed by the removal of the solvent, if appropriate followed by a heat treatment, wherein a continuous layer is formed on the substrate which comprises one or more compounds having a good storage capacity and a high conductivity for electrons, which is of the type ABCO(x-δ)Hal(y-ξ) with a potassium nickel fluorite structure, where x+y=4, and δ and ξ 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.