NOVELTY - A secondary battery contains an electrolyte solution provided with positive electrode and negative electrode. The negative electrode contains carbon material as negative electrode active material. The electrolyte solution contains ethylene carbonate, alkylated cyclic carbonate (I), electrolytic salt, aromatic compound containing aromatic ring, several bonds between carbon and nitrogen or several bonds between carbon acid component, and unsaturated carbon-bond cyclic carbonate (II) and/or halogenated cyclic carbonate (III).    USE - Secondary battery e.g. lithium ion secondary battery is used for electric tool, electric vehicle and electric power storage system (all claimed). Uses include but are not limited to mobile telephone, digital still camera, notebook personal computer, cordless telephone apparatus, headphone stereo cassette tape recorder, portable ratio, portable television, electric vehicle, hearing aid and portable information terminal.    ADVANTAGE - The secondary battery has high capacity, and suppressed generation of swelling.    DETAILED DESCRIPTION - A secondary battery contains an electrolyte solution provided with positive electrode and negative electrode. The negative electrode contains carbon material as negative electrode active material. The electrolyte solution contains ethylene carbonate, alkylated cyclic carbonate of formula (I), electrolytic salt, aromatic compound containing aromatic ring, several bonds between carbon and nitrogen or several bonds between carbon acid component, and unsaturated carbon-bond cyclic carbonate of formula (II) and/or halogenated cyclic carbonate of formula (III). The content of aromatic compound in electrolytic solution is 0.1-1 wt.%. The content of alkylated cyclic carbonate is more than the content of ethylene carbonate, in electrolyte solution.    R1-R4=H or 1-4C alkyl, in which at least one of R1-R4=alkyl.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of winding electrode component. (Drawing includes non-English language text)    Winding electrode component (20)    Positive electrode (21)    Positive electrode collector (21A)    Negative electrode (22)    Separator (23)