SO2-BASED ELECTROLYTE FOR RECHARGEABLE BATTERY CELL AND RECHARGEABLE BATTERY CELL COMPRISING THE SAME

The invention relates to an SO₂-based electrolyte for a rechargeable battery cell, containing at least one first conducting salt having formula (I), wherein M is a metal selected from the group consisting of alkali metals, alkaline earth metals, metals of group 12 of the periodic table of elements and aluminum; x is an integer from 1 to 3; the substituents R¹, R², R³ and R⁴ are independently selected from the group consisting of C₁-C₁₀ alkyl, C₂-C₁₀ alkenyl, C₂-C₁₀ alkynyl, C₃-C₁₀ cycloalkyl, C₆-C₁₄ aryl and C₅-C₁₄ heteroaryl; and wherein Z is aluminum or boron. Furthermore, the invention relates to a rechargeable battery cell (2), containing an electrolyte according to at least one of the aforementioned claims, an active metal, at least one positive electrode (4), at least one negative electrode (5) and a housing (1).