Abstract: An activatable lithium/bromine trifluoride electrochemical cell comprising an anode of lithium or lithium alloy, a positive current collector based on carbon black, and an electrolyte based on bromine trifluoride, wherein the quantity of bromine trifluoride is not less than 200 ml per dm.sup.2 of anode area, and that means are provided for causing the electrolyte to circulate through said cell at a linear speed of not less than 0.5 cm/second. Discharge yield is doubled [curve B] compared with a prior art cell [curve A].

Abstract: A lithium and bromine trifluoride electrochemical cell designed to be discharged after being activated and stored, the cell comprising an anode made of lithium or lithium alloy and a positive current collector made of carbon black, and containing at least one compound that is soluble in bromide trifluoride, and is capable of stabilizing the passivation layer of said anode and of blocking corrosion of said anode during storage, the compound being selected from sulfonates and being at a concentration lying in the range 10.sup.-2 moles per liter to 1 mole per liter. After the cell of the invention has been stored, it restores a large fraction of its initial capacity (curve C).

Abstract: A process for preparing a compound using a vanadium oxide derivative for the cathode of a thermal cell. According to the invention, a powdered mixture is produced using vanadium pentoxide, a carbon, and a mixture of alkaline halides; then heat processing is conducted at a temperature ranging from 360.degree. C. to 650.degree. C. for a period ranging from 15 minutes to 2 hours inclusive.A cathode material for a thermal cell is obtained which displays a stable discharge voltage (curve A).

Abstract: A method of producing a solid electrolyte for an electrochemical cell, the cell comprising at least one first complexing polymer presenting in its monomer pattern at least one heteroatom and at least one ionizable alkaline salt complexed in the said polymer, wherein said complexing polymer is mixed with at least one second polymer miscible with the said complexing polymer and having cross-linkable functions; said cross-linkable functions then being physically cross-linked, with the complexing polymer being brought to an essentially amorphous state during said cross-linking operation.The electrolyte obtained can be used in electrochemical cells operating at ambient temperature.

Abstract: A cathode for an electrolyser. It comprises porous conductive material which includes sintered nickel impregnated with a catalyst, characterized in that said catalyst is a molybdate of nickel or iron or mixtures thereof. The invention is used for manufacturing hydrogen by electrolysing an aqueous alkaline solution.

Abstract: A bipolar electrode for an electrolyzer. It is characterized in that the anode surface and the cathode surface of said electrode both comprise a porous conductive material which includes sintered nickel previously impregnated with nickel molybdate. The invention is used for manufacturing hydrogen by electrolyzing an aqueous alkaline solution.

Abstract: A bipolar electrode for an electolyser. It is characterized in that the anode surface and the cathode surface of said electrode both comprise a porous conductive material which includes sintered nickel previously impregnated with nickel molybdate. The invention is used for manufacturing hydrogen by electrolysing an aqueous alkaline solution.

Abstract: An electrolyzer for basic solutions. This electrolyzer is characterized by the fact that the anode comprises a porous conductive material comprising sintered nickel impregnated with a quantity of nickel hydroxide such that the proportion by weight between the nickel hydroxide and the nickel lies between 50 and 75% approximately.