TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The overlithiated transition metal oxide comprises metal compounds of formulae (xLi2MO3-(1-x)LiM1aO2) (IV), (x1Li2MnO3-(1-x)LiNia1Cob1Mnc1O2) (V), (x2Li2MO3-yLiM1aO2-zLi1+dM1b2-dO4) (VI), (Li(Lix3Mey1)O2+d1), (VII) and (Li(Lix4Nia1Cob1Mnc1)O2+d2) (VIII). The silicon-based negative active material comprises silicon, silicon oxide (SiOx), where x is 0 or 2, and/or Si-Z alloy, where Z includes alkali metal, alkali earth metal, a Group 11 element, a Group 12 element, a Group 13 element, a Group 14 element, a Group 15 element, a Group 16 element, a transition metal, and/or a rare earth element, and is not silicon. The silicon-based negative active material has a nano-structure having a dimension of at least one region of less than 500 nm. The nano-structure has a structure comprising nanoparticle, nanopowder, nanowire, nanorod, nanofiber, nanocrystal, nanodot, and/or nanoribbon. The electrolyte further comprises an additive comprising tris(trimethylsilyl) phosphate, lithium difluorooxalatoborate, vinylcarbonate, propanesultone, succinitrile, lithium tetrafluoroborate, a silane compound, and/or a silazane compound. The electrolytic solution further comprises: a carbonate-based compound including a chain carbonate compound and a fluoro carbonate compound; an ester-based compound; an ether-based compound; a ketone-based compound; an alcohol-based compound; and/or an aprotic solvent. The fluorocarbonate compound is present in an amount of 1-30 vol.%. Each of the silane compound and the silazane compound has a functional group capable of forming of a siloxane bond.x = 0 or 1;M = metal comprising Period 4 transition metals and Period 5 transition metals having a mean oxidation number of +4;M1a = metal comprising Period 4 transition metals and Period 5 transition metals having a mean oxidation number of +3;x1 = 0 or 1;a1-c1 = 0 or 1, where the sum of a1, b1 and c1 is 1;x2, y, z = 0 or 1, where the sum of x2, y and z is 1;d = 0-0.33;M1b = metal comprising Period 4 transition metals and Period 5 transition metals having a combined mean oxidation number of +3 or +4;x3 = 0 or 1, where the sum of x3 and y1 is 1;d = less than or equal to 0-0.1;Me = metal comprising Mn, V, Cr, Fe, Co, Ni, Zr, Re, Al, B, Ge, Ru, Sn, Ti, Nb, Mo, or Pt;x4, a1, b1, c1 = 0 or 1; andd2 = less than or equal to 0-0.1, where the sum of x4, a1, b1 and c1 is 1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fluorinated ether solvent comprises ether compounds of formulae (Rf1-O-Rf2) (I), (Rf1-O-R) (II) and (Rf1-O-(R1a-O)n-Rf2) (III). The fluorinated ether solvent comprises 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (HCF2CF2CH2OCF2CF2H), HCF2CF2CH2OCF2CH3, CF3CF2CH2OCF2CF2H, CF3CF2CH2OCF2H, HCF2CF2OCH2CF3, HCF2CF2CH2OCF2CFHCF3, CF3CF2CH2OCF2CFHCF3, HCF2CF2CH2OCH2CFHCF3, CF3CF2CH2OCH2CFHCF3, and/or HCF2CF2CH2OCH3. The fluorinated ether solvent is present in an amount of 3-70 vol.%, preferably 10 vol.% or more. The functional group is acryl, amino, epoxy, methoxy, or vinyl. The additive is present in an amount of 0.01-10 wt.%.Rf1, Rf2 = linear or branched 1-12C fluoroalkyl group having at least one hydrogen atom substituted with a fluoro group;R = linear or branched 1-12C alkyl;R1a = linear or branched 1-5C alkylene; andn = 1-5. Preferred Definitions:    Rf1, Rf2 = fluoroalkyl group comprising HCF2-, CF3-, HCF2CF2-, CH3CF2-, CF3CH2-, CF3CF2-, (CF3)2CH-, HCF2CF2CH2-, CF3CH2CH2-, HCF2CF2CF2CH2-, HCF2CF2CF2CF2CH2-, CF3CF2CH2-, CF3CFHCF2CH2-, HCF2CF(CF3)CH2-, or CF3CF2CH2CH2-;    R = alkyl comprising -CH3, -C2H5, -C3H7, or -CH(CH3)CH3; and    R1a = alkylene comprising -CH2-, -CH2CH2-, or -CH2CH2CH2-.