TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium salt comprises lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate or lithium bis(fluorosulfonyl)imide. Preferred Composition: The concentration of asymmetric fluorine sulfonamide is 0.01-50 wt.%, lithium salt is 0-15 wt.%, and organic solvent is 40-90 wt.%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The asymmetric fluorine sulfonamide has structure of formula (F-S(=O)2-N-Li+-S(=O)2-Rf1) or (F-S(=O)2-N-Li+-S(=O)2-(CF2)3CF3). The SEI film-forming accelerating agent is selected from vinylene carbonate, fluoro ethylene ester, chloro-ethylene, propane, styrene-butadiene, alkyl sulfonic acid, tetra-alkyl-di-alkenyl siloxane of formula (=(CH2)n-Si(R7)(R9)-O-Si(R8)(R10)-(CH2)n=) or siloxane of formula (I), and (vinyl benzene sulfonyl) perfluoro alkyl sulfonic acid imine salt. The organic solvent is cyclic carbonate, chain linear carbonate, carboxylic acid ester, or cyclic lactone. The cyclic carbonate is selected from ethylene carbonate, or propylene carbonate, the linear chain carbonate is selected from dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, and dipropyl carbonate, the carboxylic acid ester is selected from methyl methacrylate, , CF3CO2CF3 (MA), CH3CO2CH2CH3 (EA), CF3CO2CF2CF3 (EA), CH3CO2CH2CF3 (TFEA), CF3CO2CH2CH3 (ETFA), CH3CH2CO2CH3 (MP), CF3CF2CO2CF3 (MP). The nonaqueous electrolyte further comprises functional additive i.e. SEI film-forming accelerating agent such as anti-over-charging additive, flame retardant and stabilizing agent. The non-aqueous electrolyte comprises beta-propiolactone, beta-butyrolactone as an organic solvent of a cyclic lactone, gamma-butyrolactone, alpha-methyl-gamma-butyrolactone, gamma-valerolactone, delta-valerolactone, gamma-caprolactone, or epsilon-hexyl lactone.Rf1=Cn1F2n1+1, H(CF2CF2CF2)m1CF2CF2, or F(CF2CF2O)m1CF2CF2;n1=1-8;m1=1-6;n=1-5;R7-R10+C=6-24C alkoxy or 6-24C alicyclic, preferably R7, R8 are CH3, and R9, R10 are CH3CH2;n2=0-8;M+=lithium ion, quaternary ammonium cation, phosphonium cation or sulfonium cation;R11-R17+C=1-12C alkyl -(CH2) n3CN, -(CH2)n3CO2R18, -(CH2CH2O)x1(CH2)y1CH3, -CH2O(CH2)y1CH3,-(CH2CH2O)xRF1, or -(CH2CH2S)x1RF1;R18=1-4C alkyl;RF1=Cn3F2n3+1;x1=1-12;y1=0-4;andn3=1-8..