Liquid Electrolyte Composition, and Electrochemical Cell Comprising Said Electrolyte Composition

A liquid electrolyte composition for an electrochemical cell is provided. The liquid electrolyte composition includes the following components: (A) sulfur dioxide; (B) at least one salt. The salt containing an anionic complex with 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 from group 12 in the periodic table, m represents 1 or 2, Z is a central ion selected from among the group consisting of aluminum and boron. R1 and R2 each represents a monovalent hydrocarbon group; L1, L2 and L3 each independently represents an aliphatic or aromatic bridge group, the bridge group along with the central ion Z and with two oxygen atoms bound to the central ion Z and to the bridge group forming a ring.