Abstract: The electrolyte is constituted by a conductive vitreous compound having the formula aP.sub.2 S.sub.5, bLi.sub.2 S, cLiX, where X represents chlorine, bromine, or iodine, and where a, b, and c are numbers chosen so that the ratio b/(a+b) lies between 0.61 and 0.70, and so that the ratio c/(a+b+c) is less than or equal to a limit corresponding to the solubility in vitreous phase of LiX in the compound aP.sub.2 S.sub.5, bLi.sub.2 S, with the positive active material comprising 20% to 80% by volume solid electrolyte together with an electron conductor, the improvement wherein a substance chosen from the halogens and the chalcogens is included in the electrolyte in order to produce an in situ chemical reaction at the lithium electrolyte interface thereby creating an ionically conductive bonding layer comprising a lithium halogenide or chalcogenide.

Abstract: The sealing between the terminal (1) and the metal wall (2) is provided by a glass seal (3). At least that portion of the terminal which comes into contact with the glass seal is covered with a layer of at least one electrically insulating oxide (4).

Abstract: A primary cell of high specific energy in which the anode active material (16) is an alkali metal and the cathode active material is sulphur oxychloride which simultaneously acts as an electrolyte solvent, said electrolyte further containing a dissolved salt and a co-solvent. The co-solvent is chosen from among phosphoryl chloride and benzoyl chloride; the dissolved salt is lithium tetrachloroaluminate.

Abstract: The invention relates to a solid positive active material for electric cells whose negative active material is an alkali metal. In accordance with the invention, said positive material is a compound formed by two oxides, namely, bismuth oxide Bi.sub.2 O.sub.3 and cupric oxide CuO. Application to lithium cells.