TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The ionizable lithium salt comprises anion such as fluorine ion, chlorine ion, bromine ion, iodine ion, nitrate ion, dicyanamide ion, tetrafluoroborate ion, perchlorate ion, hexafluorophosphate anion, bis(trifluoromethyl)tetrafluoro phosphate ion ((CF3)2PF4-), tris(trifluoromethyl)trifluorophosphate ((CF3)3PF3-), tetra(trifluoromethyl)difluorophosphate ((CF3)4PF2-), penta(trifluoromethyl) fluorophosphates ion ((CF3)5PF-), hexa(trifluoromethyl) phosphate ion ((CF3)6P-), triflate anion (CF3SO3-), perhalogenated alkylsulfonate such as (CF3CF2SO3-), bis(trifluoromethanesulfone)imide ion ((CF3SO2)2N-), bis(fluorosulfonyl)imide anion ((FSO2)2N-), CF3CF2(CF3)2CO-, tris(pentafluorosulfanyl)methanide anion ((SF5)3C-), tris((trifluoromethyl)sulfonyl)methanide anion ((CF3SO2)3C-), perfluorooctanesulfonate anion (CF3(CF2)7SO3-), trifluoroethanoate anion (CF3CO2-), acetate ion (CH3CO2-), thiocyanate anion, and bis(perfluoroethylsulfonyl)imide ion ((CF3CF2SO2)2N-).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The amide compound (I) is N-methoxy-N-methyl-2,2,2-trifluoroethyl carbamate, N-methoxy-N-methyl-2-fluoroethyl carbamate, N-methoxy-N-methyl pentafluoropropyl carbamate, N-methoxy-N-methyl-2 -(perfluorohexyl)ethylcarbamate and N-methoxy-N-methyl 6-(perfluorobutyl)hexylcarbamate. The sulfone compound is sulfone compound of formula (II), ethane sultone, propane sultone, butane sultone, ethene sultone, propene sultone and/or butene sultone. The amide compound and the ionizable lithium salt are in eutectic form. The organic solvent is ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethylmethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, gamma -butyrolactone gamma -lactone, gamma -valerolactone, gamma -caprolactone, sigma -valerolactone and/or epsilon -caprolactone. The non-aqueous electrolyte further comprises additive comprising vinylene carbonate, fluorinated ethylene carbonate, ethylene sulfite, divinylsulfone and/or dimethyl sulfide.R1 = 1-5C alkylene or alkenylene; andn = not defined.Preferred Composition: The concentration of the sultone compound is 0.01-10 pts. wt. based on 100 pts. wt. of the total non-aqueous electrolyte. The molar ratio of amide compound and the ionizable lithium salt is 1-8:1. The concentration of the organic solvent is 50-200 pts. wt. based on 100 pts. wt. amide compound. EXAMPLE - No suitable example given.