LIQUID ELECTROLYTE COMPOSITION AND ELECTROCHEMICAL CELL HAVING THE SAME

The invention relates to a liquid electrolyte composition for an electrochemical cell. The electrolyte composition comprises the following components: (A) sulfur dioxide; (B) at least one salt, wherein the salt comprises an anionic complex having at least one bidentate ligand and the salt corresponds to formula (I) or formula (II). M is a metal cation selected from the group consisting of alkali metals, alkaline earth metals, and metals of Group 12 of the periodic table. And m is 1 or 2. Z represents a central ion selected from the group consisting of aluminum and boron. R1 and R2 are each a single-bond hydrocarbon group and are independently from each other selected from the group consisting of a C1-C8 alkyl group, a C2-C10 alkenyl group, a C2-C10 alkynyl group, a C6-C12 cycloalkyl group, and a C6-C12 aryl group; l1, L2 and L3 are each independently of one another an aliphatic or aromatic bridge group, wherein the bridge group forms a ring with a central ion Z and with two oxygen atoms bonded to the central