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Nonaqueous electrolyte solution for electric double layer capacitors

An electric double layer capacitor and non-aqueous electrolyte technology, applied in the directions of hybrid capacitor electrolytes, liquid electrolytic capacitors, etc., can solve the problems of increased resistance value of electric storage elements, reduced charge and discharge characteristics of electric double layer capacitors, and high viscosity, and achieved The effect of suppressing the decrease in resistance value and preventing a significant decrease in charge and discharge characteristics

Active Publication Date: 2013-12-11
TAIYO YUDEN KK
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  • Application Information

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Problems solved by technology

[0004] However, although the viscosity of chain sulfone is lower than that of cyclic sulfone, the viscosity becomes quite high at low temperature, especially below zero.
Accompanying this increase in viscosity, the resistance value of the storage element increases beyond the practical range, and as a result, the charge-discharge characteristics of the electric double layer capacitor itself are greatly reduced

Method used

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  • Nonaqueous electrolyte solution for electric double layer capacitors
  • Nonaqueous electrolyte solution for electric double layer capacitors
  • Nonaqueous electrolyte solution for electric double layer capacitors

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Embodiment Construction

[0029] The nonaqueous electrolytic solution for electric double layer capacitors of the present invention is a nonaqueous electrolytic solution obtained by dissolving an electrolyte salt in a nonaqueous solvent, and is characterized in that the nonaqueous solvent is a mixed solvent of a chain sulfone and a cyclic lactone compound .

[0030] The above-mentioned chain sulfone can suitably utilize ethyl isopropyl sulfone (abbreviated as EiPS), dimethyl sulfone (abbreviated as DMS), methyl ethyl sulfone (abbreviated as EMS), diethyl sulfone (abbreviated as DES) ), isopropyl methyl sulfone (abbreviated as MiPS), ethyl isobutyl sulfone (abbreviated as EiBS), isobutyl isopropyl sulfone (abbreviated as iPiBS), sec-butyl isobutyl sulfone (abbreviated as iPsBS ), butyl isobutyl sulfone (abbreviated as BiBS) and so on. These chain sulfones may be used alone or in combination of two or more. In addition, γ-butyrolactone (abbreviated as GBL), γ-valerolactone (abbreviated as GVL), δ-valer...

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Abstract

The purpose of the present invention is to provide a nonaqueous electrolyte solution for electric double layer capacitors (a solution obtained by dissolving an electrolyte salt in a nonaqueous solvent), which is capable of suppressing increase in the resistance of an electricity storage element even in a low temperature environment at 0 DEG C or less and which can be used in a normal temperature environment. This nonaqueous electrolyte solution for electric double layer capacitors is obtained by dissolving an electrolyte salt (cations and anions) in a nonaqueous solvent and is characterized in that the nonaqueous solvent is a mixed solvent of a chain sulfone and a cyclic lactone compound.

Description

technical field [0001] The present invention relates to a non-aqueous electrolytic solution for an electric double layer capacitor. Background technique [0002] An electric double layer capacitor has a built-in storage element impregnated with a non-aqueous electrolyte (a non-aqueous electrolyte obtained by dissolving an electrolyte salt in a non-aqueous solvent). This non-aqueous electrolytic solution generally uses carbonates such as propylene carbonate as a non-aqueous solvent. However, carbonates have the property of decomposing by reacting with water during charging. A non-aqueous electrolytic solution in which a cyclic sulfone such as sulfolane is used as a non-aqueous solvent (see Patent Document 1). [0003] However, cyclic sulfones have a higher viscosity than carbonate esters, and if the viscosity increases, the resistance value of the storage device tends to increase. Therefore, it has been proposed to use dimethyl sulfones with a viscosity lower than that of cy...

Claims

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Application Information

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IPC IPC(8): H01G11/60
CPCH01G11/60H01G11/62Y02E60/13H01G9/145
Inventor 须藤文续木武男长瀬贵俊
Owner TAIYO YUDEN KK
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