Nec Corporation

Sigeyuki Iwasa

Kentaro Nakahara

Jiro Iriyama

Yukiko Morioka

Masaharu Satoh

Masahiro Suguro

A battery, which has excellent safety in an overcharged state and is excellent in low-temperature characteristics and cycle characteristics, is provided. The electrolytic solution of the secondary battery contains a compound which has a diazine N,N'-dioxide structure represented by general formula (1). in which, n, m, n&#x2032;, and m&#x2032; each independently are an integer 0 or larger; the diazine rings and the benzene rings may be condensed alternately or randomly; and substituents R, R, R, R, R, R, R, and Reach independently represent hydrogen atom, halogen atom, or specific group. However, when n is 2 or larger, then Rand Rmay be the same or different, and when n&#x2032; is 2 or larger, then Rand Rmay be the same or different. In addition, these substituents, in cooperation with each other, may form a ring structure.

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Tokyo, Japan

Sigeyuki Iwasa