Otsuka Chemical Co., Ltd.

Taiji Nakagawa

Yoshihisa Tokumaru

Shoji Hiketa

Koichi Sorajo

Hirotoshi Iuchi

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

Provided is a production method that enables the production of a composite body of lithium titanate particles and a carbonaceous material, the composite body having excellent electrical characteristics and so on, and the composite body of lithium titanate particles and a carbonaceous material. A method for producing a composite body of lithium titanate particles and a carbonaceous material includes the steps of: preparing a raw material mixture using a titanium compound, a lithium compound, and an oligomer and/or raw material monomer of an alkali-soluble resin; and subjecting the raw material mixture to heat treatment under a non-oxidizing atmosphere to produce the composite body.

Method for producing composite body of lithium titanate particles and carbonaceous material, and composite body of lithium titanate particles and carbonaceous material

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.

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Tokushima, Japan

Taiji Nakagawa