TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The electrolyte has a viscosity of 0.5-3 cP. The non-carbon-based negative electrode comprises silicon, silicon oxide having the structure of formula (SiOx), silicon compound of formula (Si-M), tin oxide and/or tin. The non-carbon-based negative electrode comprises silicon powder or silicon oxide.x = 0-2; andM = metal comprising Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb and/or Ti.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium hexafluorophosphate is present at 1.15-2.5 M, preferably 1.3-2 M. The second additive is present at 0.1-5 (preferably 0.2-3) parts by weight.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The ethylene carbonate is present at 5-20 vol.%. The non-aqueous organic solvent further includes an ether-based, carbonate-based, ester-based, ketone-based, alcohol-based, or aprotic solvent comprising dimethoxyethane, bis(2-methoxyethyl)ether, triethylene glycol dimethylether, tetraethylene glycol dimethylether, polyethylene glycol dimethylether, propylene glycol dimethylether, dioxolane, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methylethyl carbonate, ethylmethyl carbonate (preferred), propylene carbonate, butylene carbonate, methyl acetate, ethyl acetate, n-propyl acetate, methylpropionate, ethylpropionate, gamma -butyrolactone, decanolide, valerolactone, mevalonolactone, caprolactone, cyclohexanone, ethanol, isopropyl alcohol, a nitrile of formula (X-CN), dimethylformamide, 1,3-dioxolane and/or sulfolanes. The first additive is fluoroethylene carbonate, difluoroethylene carbonate, chloroethylene carbonate, dichloroethylene carbonate, bromoethylene carbonate, dibromoethylene carbonate, nitroethylene carbonate and/or cyanoethylene carbonate. The first additive is present at 0.1-10 (preferably 1-8) parts by weight.X = 2-20C hydrocarbon group including a double bond, an aromatic ring or an ether bond.