Abstract: The active material is constituted by an alkali metal in the zero valent state which alkali metal is inserted into an insertion compound. The insertion compound receiving the alkali metal has an ordered three-dimensional lattice structure and is constituted by at least one intermetallic compound having polyatomic anionic clusters with atoms chosen from the group constituted by gallium, boron and aluminum, and with structuring counter ions chosen from the group constituted by alkaline earth and alkali ions.

Abstract: An electrochemical cell which has a negative electrode (1) including an alkali or alkali-earth metal dissolved in liquid ammonia, a positive electrode (2), an electrolyte (3), and a separator (4). The positive electrode (2) is constituted by a solution in ammonia of a chalcogen or of a chalcogenide or of an emulsion or suspension in ammonia of a solid compound suitable for intercalating the metal of the negative electrode (1). Said electrolyte (3) includes a solution of an iodide of an alkali or alkali-earth metal.The invention is used in the field of reversible high-power electric cells operating at low temperatures.

Abstract: An electric cell with a non-aqueous electrolyte. The cell includes a positive electrode whose active material is suitable for inserting the negative active material dynamically, a negative electrode whose active material includes at least one alkali metal, and an electrolyte, wherein said positive electrode includes at least one compound whose general formula is MX.sub.4 R.sub.n T.sub.p, where M represents an element chosen from among silicon, germanium, tin and lead, X represents sulphur, selenium or tellurium, R and T represent an element chosen from among copper, silver, manganese, iron, cobalt and nickel, n being greater than or equal to 0 and less than or equal to 4, p being greater than or equal to 0 and less than or equal to 2. The invention is used in connection with button type electric cells.

Abstract: An electric cell with a non-aqueous electrolyte. The cell includes a positive electrode whose active material is suitable for inserting the negative active material dynamically, a negative electrode whose active material includes at least one alkali metal, and an electrolyte, wherein said positive electrode includes at least one compound whose general formula is MX.sub.4 R.sub.n T.sub.p, where M represents an element chosen from among silicon, germanium, tin and lead, X represents sulphur, selenium or tellurium, R and T represent an element chosen from among copper, silver, manganese, iron, cobalt and nickel, n being greater than or equal to 0 and less than or equal to 4, p being greater than or equal to 0 and less than or equal to 2. The invention is used in connection with button type electric cells.

Abstract: A secondary electric cell which includes: a non-aqueous electrolyte, a negative electrode whose active material includes at least one alkali metal in contact with the electrolyte, and a positive electrode whose active material is suitable for intercalating the active material of the negative electrode, wherein said positive electrode includes an active compound or solid solution whose general formula is M.sub.x X, R.sub.y X.sub.3 where:M is an element chosen from lead and tin;R is an element chosen from bismuth and antimony; andX is an element chosen from sulphur and selenium, with x having a value lying between 0 and 1 (inclusive), and y having a value lying between 0 and 2 (inclusive). Such cells may be used in watches or pacemakers.

Abstract: A lithium electric cell. Said electric cell includes a positive electrode (1) and a negative electrode (2) in contact with a liquid electrolyte impregnates in a separator (3). The positive electrode comprising an active compound whose general formula is Li.sub.x Fe.sub.2 S.sub.z with x lying between 0 and 2, and z being not less than 3.

Abstract: The invention relates to a sodium-sulphur electric cell. It comprises a cathode tank containing sulphur, a solid electrolyte tube being disposed in this tank and containing sodium, said cathode tank being lined with a continuous strip of felt or fabric, more particularly of graphite wound in a spiral one of whose ends is in contact with the wall of the cathode tank, at least one of the turns of said spiral having a plurality of holes, the other end of the strip being in contact with either the electrolyte tube or a conductive grid surrounding the tube and disposed at a predetermined distance from that tube. The invention is implemented in electric vehicles.

Abstract: The invention relates to an electric cell of the sodium-sulphur type particularly adapted for undergoing complete recharging. It comprises a cathode tank containing sulphur, an anode tank containing sodium, these reagents being separated by a solid electrolyte tube disposed in said cathode tank fitted with graphite felt washers ensuring cathode collection of the current generated, wherein said electrolyte tube is surrounded by a grating which is connectable to the negative terminal of the recharging current source by means of a resistor. The invention is used in cells for electric vehicles.

Abstract: The invention relates to an electric cell of the sodium-sulphur type, suitable more particularly for undergoing a complete recharge. It comprises a cathode tank containing sulphur, an anode tank containing sodium, these reagents being separated by a solid electrolyte tube disposed in said cathode tank which is fitted with graphite felt washers ensuring cathode collection of the current generated, wherein some washers are disposed to have an edge distant from the wall of said electrolyte tube in order to avoid depositing sulphur on said tube during recharging. The invention is used in electric cells for electric vehicles.