TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The positive electrode contains lithium composite metal oxide and/or lithium-containing olivine type phosphate as active material. The negative electrode contains carbon material and/or metallic compound capable of occluding and discharging lithium, lithium metal, or lithium alloy, as active material.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The content of compound (I) is 0.001-10 %mass in the nonaqueous electrolyte. Compound (I) is 2-butyne-1,4-diyl diacrylate, 2-butyne-1,4-diyl-bis(2-methyl acrylate), 3-hexyne-2,5-diyl diacrylate, and/or 3-hexyne-2,5-diyl-bis(2-methyl acrylate). The nonaqueous solvent contains a cyclic carbonate and a linear ester. The volume ratio of cyclic carbonate and linear ester is 10:90-45:55. The cyclic carbonate is vinylene carbonate, vinyl ethylene carbonate, 4-ethynyl-1,3-dioxolan-2-one, 4-fluoro-1,3-dioxolan-2-one, trans/cis-4,5-difluoro-1,3-dioxolan-2-one, ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, and/or 2,3-butylene carbonate. The linear ester is methyl ethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, methyl butyl carbonate, ethyl propyl carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, dibutyl carbonate, pivalic acid ester, methyl propionate, ethyl propionate, and/or ethyl acetate. The nonaqueous electrolyte further contains sultone compound, partially hydrogenated terphenyl, phosphate ester, aromatic compound having branched alkyl group, cyclic sulfite compound, isocyanate compound, cyclic acid anhydride, and/or nitrile compound. The electrolytic salt is lithium salt or onium salt, preferably lithium hexafluorophosphate, lithium difluorophosphate, lithium monofluorophosphate, lithium tetrafluoroborate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(pentafluoroethylsulfonyl)imide, lithium bis(fluorosulfuryl)imide, difluoro bis(oxalato-O,O')lithium phosphate, and/or tetrafluoro(oxalato-O,O')lithium phosphate. The concentration of electrolytic salt is 0.3-2.5M with respect to nonaqueous solvent. Preferred Definitions:    R1-R10=H or methyl.