TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The non-aqueous electrolyte solution further contains 7-18C aromatic compound and diethyl carbonate, and cyclic-sulfonate-ester compound, disulfonic-acid ester compound, nitrile compound and/or phosphorus-containing compound of formula (1).R1-R3=1-12C alkyl optionally substituted by fluorine atom, preferably 2-8C;andn=0-6, preferably 0, 1 or 2.Preferred Content: The content of cyclic carbonate is 0.001-8 wt.% in non-aqueous electrolyte solution. The non-aqueous electrolyte solution contains preferably, 10-18C aromatic compound. The content of 7-18C aromatic compound is 0.001-5 wt.% in non-aqueous electrolyte solution. The content of diethyl carbonate is 10-90 volume% with respect to total content of non-aqueous electrolyte solution. The content of cyclic-sulfonate-ester compound, disulfonic-acid ester compound, nitrile compound and/or phosphorus-containing compound is 0.001-5 wt.% with respect to total content of non-aqueous electrolyte solution. The content of fluorinated cyclic carbonate is 0.001-10 wt.% in non-aqueous electrolyte solution, preferably 0.01-4 wt.%. Preferred Compound: The cyclic carbonate is vinylene-carbonate compound, vinyl ethylene carbonate compound and/or methylene ethylene carbonate compound, preferably vinylene-carbonate and vinyl ethylene carbonate. The 7-18C aromatic compound is biphenyl, alkyl biphenyl, terphenyl, partial hydrogenated component of terphenyl, cyclohexylbenzene, t-butylbenzene, t-amyl benzene, diphenylether and/or dibenzofuran. The cyclic-sulfonate-ester compound is 1,3-propane sultone, 1,4-butane sultone, 1,3-propene sultone and/or 1,4-butene sulfone. The disulfonic-acid ester compound is ethaediol disulfonate, 1,2-propanediol disulfonate, 1,3-propanediol disulfonate, 1,3-butanediol disulfonate and/or 1,4-butanediol disulfonate. The nitrile compound is acetonitrile, propionitrile, butyronitrile, valeronitrile, crotononitrile, 3-methyl crotononitrile, malononitrile, succinonitrile, glutaro nitrile, adiponitrile and/or fumaronitrile. The fluorinated cyclic carbonate is cis-4,5-difluoro 1,3-dioxolane-2-one, trans-4,5-difluoro 1,3-dioxolane-2-one and/or 4,4-difluoro 1,3-dioxolane-2-one. Preferred Battery: A non-aqueous electrolyte solution battery has cathode which occlude-discharge lithium ion, anode and non-aqueous electrolyte solution. The cathode contains occlusion and dischargeable metallic compounds of carbonaceous material and lithium. Anode includes lithium-transition metal composite oxide material. Preferred Property: The high-voltage battery formed using the non-aqueous electrolyte solution has charging final voltage of 4.3 V or more. EXAMPLE - Vinylene carbonate (in wt.pts) (2), cis-4,5-difluoro 1,3-dioxolane-2-one (1) and mixture (97) containing ethylene carbonate and ethylmethyl carbonate were mixed. Subsequently, dried lithium phospho-fluoride (LiPF) was dissolved in the obtained mixture to obtain non-aqueous electrolyte solution. A battery was formed using the obtained solution. The battery had excellent cycle characteristics and discharge storing characteristics.