TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The lithium salt is chosen from lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium perchlorate, lithium bis(pentafluoroethylsulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium tris(trifluoromethanesulfonyl)methide, and lithium bis(oxalate)borate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The solvent having fluoro group is chosen from cyclopentanone-containing compound of formula (1), carbonyl group-containing compound of formula: R2-O-C(=O)-O-R1 or R1-C(=O)-O-R2, and oxygen-containing compound of formula (2), preferably fluoroethylene carbonate. The siloxane compound is 1,3-divinyltetramethyldisiloxane.n=1-4;andR1,R2=1-3C hydrocarbyl, and at least one of R1 and R2 includes 1-7 fluorines.Preferred Composition: The non-aqueous electrolyte solution contains solvent having fluoro group (0.5-20 weight%) and solvent having siloxane compound (0.03-7 weight%). Preferred Solvent: The organic solvent is chosen from cyclic carbonate such as propylene carbonate, ethylene carbonate or vinylene carbonate, linear carbonate such as diethyl carbonate, dimethyl carbonate, methylethyl carbonate or dipropyl carbonate, dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, sulforan, ( gamma )-butyrolactone, ethylene sulfite, propylene sulfite, tetrahydrofuran, ethylpropionate and propylpropionate, preferably ethylene carbonate or mixture of ethylene carbonate and propylene carbonate. EXAMPLE - Lithium hexafluorophosphate was added to solvent in which ethylene carbonate, ethylmethyl carbonate and diethyl carbonate were mixed in weight ratio of 3:2:5, to obtain 1M lithium hexafluorophosphate solution. Then, fluoroethylene carbonate (2 weight%) and 1,3-divinyltetramethyldisiloxane (0.5 weight%) were added to the obtained lithium hexafluorophosphate solution, to obtain a non-aqueous electrolyte solution.