| abstract |
A secondary battery comprising: a positive electrode, a negative electrode, and an electrolytic solution containing a sulfonyl compound represented by R1(-O-C(=O)-R2-S(=O) 2 -Rf1) n1 or the like at least one of them. Here, R1 is any one of an n1-valent hydrocarbon group, an n1-valent oxygen-containing hydrocarbon group, an n1-valent halogenated hydrocarbon group, and an n1-valent halogenated oxygen-containing hydrocarbon group. R2 is any one of a divalent hydrocarbon group and a divalent halogenated hydrocarbon group. Rf1 is either a halogen group or a monovalent halogenated hydrocarbon group. n1 is an integer equal to or greater than 2. |