Abstract: The disclosure describes an anode made of a thin metallic foil in discharged condition which is converted into a dense metallic alloy of an alkali metal during the first charge. The disclosure also describes an electrochemical rechargeable battery in discharged condition. The latter comprises an anode made of a thin metallic foil, such as aluminum, magnesium or tin, an electrolyte, for example a polymeric electrolyte, as well as a cathode based on an oxide, a sulfide or an halide, prepared in discharged condition and constituting a source of alkali metal preferably lithium. The cathode should be capable of freeing the alkali metal under a charge so that the latter is introduced into the metallic foil to form an alloy of the alkali metal and of at least a portion of the metal constituting the metallic sheet. To obtain the charged battery, it is merely sufficient to apply a charge during a certain period of time while the anode is being transformed into an alloy.

Abstract: Anode composition based on a mixture of plastic or elastomeric macromolecular material with ionic conduction, an alloy of lithium and particles of a carbon compound of the formula: Li.sub.x C where 0.ltoreq.x<0.3. Anodes so constituted, as well as electrochemical generators with solid electrolytes comprising these anodes. Better utilization of the lithium of the materials of the electrodes.

Abstract: A method and a device for detecting a gaseous anhydride and measuring its concentration in an oxygen-bearing gas. The method comprises the following steps: (a) forming an electrolytic junction by contact between a first solid-electrolyte element containing oxyanions of the anhydride to be detected and a second, 0.sup.