Abstract: The invention relates to novel non-aqueous electrolyte compositions comprising: a) a sodium-containing compounds of the general formula NaMFX and b) a solvent system comprising a first solvent component i) which comprises propylene carbonate and one or more further organo carbonate-containing solvents, and a second solvent component ii) which comprises one or more glycol diethers and/or one or more glycol ether acetates; wherein the molar ratio of propylene carbonate:one or more glycol diethers and/or one or more glycol ether acetates is in the range 1:0.1 to 1:3.

Abstract: The invention relates to electrodes comprising doped nickelate-containing compositions comprising a first component-type comprising one or more components with an O3 structure of the general formula: AaM1vM2wM3xM4yM5zO2 wherein A comprises one or more alkali metal selected from sodium, lithium and potassium M1 is nickel in oxidation state 2+, M2 comprises one or more metals in oxidation state 4+, M3 comprises one or more metals in oxidation state 2+, M4 comprises one or more metals in oxidation state 4+, and M5 comprises one or more metals in oxidation state 3+ wherein 0.85?a?1; 0<v<0.

Abstract: The invention relates to electrodes comprising doped nickelate-containing compositions comprising a first component-type comprising one or more components with an 03 structure of the general formula: AaM1vM2wM3xM4yM5zO2 wherein A comprises one or more alkali metal selected from sodium, lithium and potassium M1 is nickel in oxidation state 2+, M2 comprises one or more metals in oxidation state 4+, M3 comprises one or more metals in oxidation state 2+, M4 comprises one or more metals in oxidation state 4+, and M5 comprises one or more metals in oxidation state 3+ wherein 0.855?a?1; 0<v<0.

Abstract: The invention relates to electrodes comprising doped nickelate-containing compositions comprising a first component-type comprising one or more components with an 03 structure of the general formula: AaM1V M2W M3X M4y M5Z O2 wherein A comprises one or more alkali metal selected from sodium, lithium and potassium; M1 is nickel in oxidation state 2+, M2 comprises one or more metals in oxidation state 4+, M3 comprises one or more metals in oxidation state 2+, M4 comprises one or more metals in oxidation state 4+, and M5 comprises one or more metals in oxidation state 3+ wherein 0.85?a?1; 0<v<0.

Abstract: The invention relates to electrodes comprising doped nickelate-containing compositions comprising a first component-type comprising one or more components with an 03 structure of the general formula: AaM1VM2WM3XM4yM5ZO2 wherein A comprises one or more alkali metal selected from sodium, lithium and potassium; M1 is nickel in oxidation state 2+, M2 comprises one or more metals in oxidation state 4+, M3 comprises one or more metals in oxidation state 2+, M4 comprises one or more metals in oxidation state 4+, and M5 comprises one or more metals in oxidation state 3+ wherein 0.85?a?1; 0<v<0.

Abstract: The present invention relates to a mixed metal oxide exhibiting perovskite-type structural characteristics in which there are cations of Ba, Ca or Sr, a rare earth metal and Fe, Cr, Cu, Co or Mn present in three different coordination sites or a composition thereof, to a cathode composed of the mixed metal oxide or composition thereof and to a solid oxide fuel cell comprising the cathode.