Mixed conductors of graphite, processes for their preparation and their use, notably for the production of electrodes for electrochemical generators, and new electrochemical generators

Claim 1

Electrochemical generator comprising a negative electrode containing an alkali metal such as Li, Na, K, Rb or Cs either in the metallic state or in the form of an alloy with another metal, and an electrolyte permitting conduction of ions of said alkali metal, wherein the positive electrode contains a compound M x .sbsb.1 C n (M' y X z ) in which M is the same alkali metal as that of the negative electrode; x 1 is zero or comprised between zero and a value depending on the affinity of the selected alkali metal for the corresponding compound of formula C n (M' y X z ); y and z have values corresponding to the indices defining the relative proportions of the metal and non-metallic atoms respectively in the formula of the corresponding product M' y X z ; n has a value equal to or higher than a minimum value which is a function of the initial binding energy between graphite and the corresponding compound M' y X z , this value not exceeding however that corresponding to the formation of continuous monomolecular graphite layers interposed between the layers of the compound M' y X z in the corresponding compound C n (M' y X z ).