Electrochemical cell with negative active material based on an alkaline or alkaline earth metal

Claim 1

Electrochemical cell the negative active material whereof is based on an alkaline or alkaline earth metal and the electrolyte whereof comprises a solute and at least one solvent selected from among the liquid oxyhalides, said solvent also constituting the positive active material, wherein said electrolyte further contains at least one organic compound of the alkaline or alkaline earth polyorganosulfatometallate type having the general formula M{M'(SO.sub.3 R).sub.i (SO.sub.3 R').sub.j (X).sub.k }.sub.m with i+j+k=n, in which: M is the said alkaline or alkaline earth metal and m its degree of oxidation, M' is selected from among Al, B, Ga, In, V, Sb, Nb, Si, W and Ta, n being its valence, R designates an organic radical of the alkyl, aryl, alkaryl or aralkyl type, with 0≦i<n, R' designates an organic radical of the alkyl, aryl, alkaryl or aralkyl type, with 0≦j<n, i≠0 if j=0 and j≠0 if i=0, X is selected from the group including fluorine, chlorine, bromine and iodine, with 0≦k<n.