TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: In the secondary battery, the positive electrode and the negative electrode are laminated via a separator (23) containing a polymer compound, where the separator has a multi-layer structure composed of a laminate of two or more kinds of the polymer compounds in the thickness direction, or a single-layer structure composed of two or more kinds of the polymer compounds having a different composition from each other in the thickness direction. In the secondary battery, an open circuit voltage in a fully charged state is 4.25-6 V.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The aryl skeleton is naphthalene, biphenyl, phenanthrene, fluorene or heterofluorene. In (I), the number of nitrogen-containing functional groups is greater than or equal to 2. In the nitrogen-containing aryl compound, the aryl ring contains two or more rings, and one or more nitrogen-containing functional groups are bonded to every ring of at least two rings of the two or more rings, and a value counted from a carbon atom in the ring to which one of the nitrogen-containing functional groups is bonded to a carbon atom in other ring to which the other nitrogen-containing function group is bonded such that the number of carbon atoms becomes the smallest is 2-4. The content of the nitrogen-containing aryl compound in the electrolytic solution is 0.001-10 wt.%. The electrolytic solution contains a nonaqueous solvent, where the nonaqueous solvent contains, as a halogenated cyclic carbonate, at least one of 4-fluoro-1,3-dioxolan-2-one and 4,5-difluoro-1,3-dioxolan-2-one. The content of the halogenated cyclic carbonate in the nonaqueous solvent is 0.01-30 wt.%. The nitrogen-containing aryl compound contains at least one naphthalene compound of formula (II)-(IV), biphenyl compound of formula (V)-(VI), anthracene compound of formula (VII)-(XI) or a metal containing compound of formula (XII) or (XIII).X1-X35 = X;Y1-Y35, R1-R27 = Y1, provided that arbitrary two or more of X1-X29, Y1-Y29, R1-R27 may be bonded to each other to form a ring structure;z1-z35 = z;a1-a9, b1-b12, c1-c12, d7, d8 = greater than or equal to 0, provided that the sum of a1 and a2, the sum of a3 and a4 is greater than or equal to 1, the sum of a5, a6 and a7 is greater than or equal to 1, the sum of a8 and a9 is greater than or equal to 1 and the sum of b6 and c6 is greater than or equal to 0;d3, d4 = greater than or equal to 3; andM = C, O, S, Se or Te.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer compound contains at least one member consisting of polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, aramid, polyamide-imide, polyamide, polyimide, polyether imide or polyacrylonitrile.