Abstract: A positive active material for an electric cell, said material being constituted by anhydrous copper borate whose formula is Cu.sub.3 B.sub.2 O.sub.6. A method of making such an active material. An electric cell whose positive active material (3) is anhydrous copper borate Cu.sub.3 B.sub.2 O.sub.6, whose negative active material (6) is lithium and whose electrolyte is a solution which is liquid at ambient temperature and whose solvent is an aprotic compound.

Abstract: The invention relates to a positive active material for an electric cell. Such an active material is constituted by a vitreous compound which results from the addition of a small quantity of silica to at least one electrochemically reducible metal oxide. Application to electric cells with non-aqueous electrolyte, the negative electrodes of these cells being based on an alkali or alkali-earth metal.

Abstract: The invention relates to a positive active material for an electric cell with a non-aqueous electrolyte. Said active material is constituted by an oxyphosphate whose formula is Cu.sub.n O.sub.p (PO.sub.4).sub.2,n being an integer greater than 3 and lower than or equal to 6 and p being equal to n-3. Application to lithium primary cells.

Abstract: The invention relates to a cylindrical electric cell in which the negative electrode (8) is a sheet of lithium wound round a current collector (1) which is elastically deformable and is in the form of a cylinder whose directrix is a substantially circular curve with two distinct ends. In accordance with the invention, the two portions of cylinder close to said ends are cut into matching shapes so that they fit into each other, the protruding parts (2) of one portion being accomodated in the recessed parts (3) of the other portion. Application to electric cells whose positive active material is liquid.

Abstract: The invention relates to an air-depolarized primary cell which includes a container (1), a negative electrode (4) disposed against the walls of the container, a positive electrode (3) disposed in the central portion of the container and a ventilation circuit (6, 8, 9, 28) for the positive electrode; a gas-filled space (15) is provided above the negative electrode and the electrolyte for accommodating the negative electrode as it expands during use; the space is delimited by the ventilation circuit, the walls of the container and a wall (26) which is impermeable to oxygen. In accordance with the invention, the periphery of the impermeable wall has a step configuration rim (27, 30) welded to the walls of the container, this avoids cracks damaging the seal (17) between the impermeable wall (26) and the ventilation circuit when the walls of the container (1) are deformed by the expanding negative electrode.