Otsuka Chemical Co., Ltd.

Shoji Hiketa

Yoshihisa Tokumaru

Taiji Nakagawa

Akihiro Nabeshima

Akinori Oka

Koichi Sorajo

Masatoshi Uetani

Hiroaki Shima

Yoshinobu Abe

Yoshinobui Abe

Yoshihiro Okada

To provide an electrolytic solution that suppresses increase in the OHion concentration even in the case of electrochemical changes and thereby reduces deterioration or corrosion of resin, rubber, or metal to improve the reliability of an electrochemical device, an electrolyte used in the electrolytic solution, and an electrochemical device comprising the electrolytic solution. The electrolyte, for example, comprises a compound having a cation unit represented by the following formula and an electrolyte (a quaternary ammonium salt or the like). (In the formula, R, R, R, and Rare the same or different and each represent an alkyl group or an alkoxyalkyl group; Rand Rmay together form a ring such as a pyrrolidine ring and a piperidine ring; and Rand Rmay together form a ring such as a pyrrolidine ring and a piperidine ring.)

Electrolyte for electrochemical device, electrolytic solution, and electrochemical device

The present invention provides a nonaqueous electrolytic solution that provides an electric double layer capacitor having excellent durability. The nonaqueous electrolytic solution of the present invention is a nonaqueous electrolytic solution for electric double layer capacitors prepared by dissolving a quaternary ammonium salt as an electrolyte in a nonaqueous solvent, and the nonaqueous electrolytic solution has an alkali metal cation concentration of 0.1 to 30 ppm.

Nonaqueous electrolytic solution for electric double layer capacitors

Provided is a nonaqueous electrolytic solution that provides an electric double layer capacitor having excellent durability. The nonaqueous electrolytic solution is prepared by dissolving a quaternary ammonium salt as an electrolyte in a nonaqueous solvent, and the nonaqueous electrolytic solution comprises a diethylpyrrolidinium salt and/or a 1-ethyl-1,3-dimethylpyrrolidinium salt.

Nonaqueous electrolytic solution for electric double layer capacitor

An additive of the formula (1) for use in electrolytic solutions wherein A is &#x2014;CH(X)&#x2014; or &#x2014;C&#x2550;C(X)&#x2014;, X being hydrogen, halogen, alkyl having 1 to 4 carbon atoms, alkoxycarbonyl having 2 to 5 carbon atoms, benzoyl or alkoxycarbonylalkyl having 3 to 9 carbon atoms, Qand Qare the same or different and are each alkyl having 1 to 6 carbon atoms, alkoxyl having 1 to 4 carbon atoms, alkoxycarbonylalkyl having 3 to 9 carbon atoms or amino having as a substituent alkyl having 1 to 4 carbon atoms, and A, Qand Qmay form a ring structure.

Additives for electrolyte solution and electrolyte solution

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Tokushima, Japan

Shoji Hiketa