To provide a secondary battery capable of enhancing cycle characteristics and a preservation property.
The secondary battery is provided with a cathode 21 and an anode 22 together with the electrolyte solution impregnated in a separator 23 fitted between the cathode 21 and the anode 22. The solvents of the electrolyte solution include nitrile compound containing a site where a nitrile group and an electron-attracting group (such as -C(=O)-) are directly coupled with each other. As compared with the case in which no such nitrile compounds are contained, or other nitrile compounds are contained, chemical stability of the electrolyte solution is improved, so that decomposition reaction of the electrolyte solution is restrained at charging and discharging.
COPYRIGHT: (C)2010,JPO&INPIT
Hiroyuki Yamaguchi
Tadahiko Kubota
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Yasushi Santanzaki
Masao Hasebe