TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The electrolyte contains lithium salts chosen from lithium hexafluoro phosphate, lithium tetrafluoro borate, lithium hexafluoro arsenate, lithium hexafluoro antimonate, lithium perchlorate, lithium aluminum chlorate and/or LiN(CkF2k+1SO2)(CmF2m+1SO2).k,m=1 or 2.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The compound (C) contains biphenyl, terphenyl or their partially hydrogenated groups. The electrolyte liquid contains 0.05-5 mass% of each of disulfonate compound (I) and compound (C). The electrolyte liquid further contains a cyclic monosulfonate of formula (II) and a cyclic disulfonate of formula (III).n=0-2;R5-R10=hydrogen, (un)substituted 1-12C alkyl, (un)substituted 1-6C fluoroalkyl or 1-6C polyfluoroalkyl group;Q=oxygen, methylene group or single bond;A=(un)substituted 1-5C alkylene group, carbonyl group, sulfinyl group, 1-5C polyfluoroalkylene group, (un)substituted 1-5C fluoroalkylene group, group chosen from (un)substituted 1-5C alkylene, polyfluoroalkylene or fluoroalkylene group in which at least 1 C-C bond becomes C-O-C bond;andB=(un)substituted 1-5C alkylene group, 1-5C polyfluoroalkylene group or (un)substituted 1-5C fluoroalkylene group.The electrolyte liquid contains vinylene carbonate and/or its derivatives. The aprotic solvent is chosen from cyclic and linear carbonates, aliphatic carboxylate esters, gamma-lactone, cyclic and linear ethers and/or their fluorinated derivatives. The cathode of the secondary battery contains graphite or amorphous carbon, or lithium metal as cathode active material. SPECIFIC COMPOUNDS - The compound (C) is chosen from thiophene, furan, cyclohexyl benzene, cyclopentyl benzene, cumene, 1,3-diisopropyl benzene, diphenyl ether, 3-phenoxy toluene, 2,3-benzofuran, 4-biphenylyl acetate, 4-biphenynyl benzoate, 2-biphenynyl methyl carbonate, 4-biphenynyl methyl carbonate, 1,2-diphenoxy ethane, 1-(4-biphenyl oxy)-2-phenoxy ethane and/or 1-(2-biphenyl oxy)-2-phenoxy ethane.