Abstract: The invention relates to a process for the preparation of ternary lithium spinels, and to ternary lithium spinels of the general formula LiaMebMn2−bOc. The invention is achieved in accordance with the invention by a process which comprises dissolving a manganese salt in water, adding an oxidant, adding the mixture to an aqueous lithium hydroxide solution containing from 0.1 to 1 % by weight, based on the content of LiOH employed, of seed crystals selected from the group consisting of activated carbon, Aerosil and spine, and separating off, washing and heating the precipitate.

Abstract: A positive electrode for galvanic high-temperature cells with solid negative electrodes based upon Li, Mg, Ca or Al is produced by sintering a heavy metal sulfide (e.g. FeS, CnS), with a heavy metal powder (e.g. Fe, Ni). In the sinter electrode the heavy metal powder present in weight percentage of about 20% to 40% forms a rigid electrically conductive framework in which the active heavy metal sulfide is embedded. The free-pore volume of the electrode is about 50%.