Patent ID: 8703329

Claim:
An electrolyte for use in an electrochemical cell having an anode and a cathode, the electrolyte comprising: at least one polar solvent; and a redox shuttle compound in the at least one polar solvent that provides shuttling of current in the cell, the redox shuttle compound corresponding to Formula I: M + X − (I) wherein: M is an alkali metal; and X − is a closo-monocarborate anion of the formula R 1 CB 11 R 2 R 3 R 4 R 5 R 6 R 7 R 8 R 9 R 10 R 11 R 12 , where: R 1 is a polar functional group, the redox shuttle compound being soluble in the at least one polar solvent of the electrolyte, and a plurality of members selected from R 2-12 each comprises a C1-C4 alkyl.