HYDROFLUOROCARBON (HFC)-BASED SAFE ELECTROLYTE FOR SECONDARY BATTERIES

An electrolyte composition comprising a solution comprising an active salt; and a solvent portion that comprises a first solvent and a second solvent, wherein the first solvent is a hydrofluorocarbon compound having a structure of CHF, wherein x is from 4 to 10, y is from 1 to 10, z is from 5 to 20, and the z:y ratio is from 2:1 to 10:1.