Alkaline storage battery with a negative zinc electrode

A storage battery, comprising at least one positive electrode and a negative zinc electrode in contact with an electrolyte via at least one electrolyte-impregnated separator, clamped against two respective bipolar screens supported by a sealing frame;

• wherein the positive electrode is in contact with a first electrolyte having a predetermined volume and composition via at least one first separator, wherein the negative electrode is in contact with a second electrolyte having a predetermined volume and composition different from those of the first electrolyte via at least one second separator, wherein the first and second electrolytes are separated by a membrane forming a zincate and optionally aluminate filter, said membrane defining a positive compartment and a negative compartment;
• wherein said membrane has a given anionic conductivity for at least 90% of the through-current of OH− anions, and wherein said membrane is based on polyoxyethylene or polyoxymethylene modified by exchange groupings of the quarternary ammonium type.