Electrolyte-electrode assembly for a combustible battery

In an electrolyte-electrode assembly for a combustible battery comprising a solid ceramic electrolyte conductive to oxygen ions and impermeable to gas, an electrode comprising a first porous layer of indium oxide doped with tin, said layer being composed of dendrites which form trunks having a diameter between 500 and 10,000 A and whose principal axes are perpendicular to the surface of the electrolyte, and a second porous layer formed of granules of at least one chromite having the formula:

• T.sub.1-y Sr.sub.a Ca.sub.b CrO.sub.3
• in which T is a rare earth or ytrium or a mixture of these elements, y, a and b are numbers between 0 and 1, being able to take the value o and satisfying the equation a + b = y, an improvement wherein said electrode-electrolyte assembly further comprises a continuous layer of ceramic material, conductive to oxygen ions and electrons, interposed between the electrolyte and the electrode and being united with the electrolyte and with the said porous layer of the electrode to form a composite layered assembly therewith, said ceramic material being a solid solution of mineral oxides comprising zirconium oxide, uranium oxide and at least one oxide selected from the group consisting of calcium oxide, magnesium oxide, barium oxide, strontium oxide, scandium oxide, yttrium oxide, ytterbium oxide and oxides of rare earths.