Electric double layer capacitor

An electric double layer capacitor and electrolyte technology, applied in electrolytic capacitors, capacitors, hybrid capacitors, etc., can solve the problems of reduced electrical conductivity, narrow potential window, difficult operation, etc., and achieve the effect of excellent charging and discharging performance and reducing internal impedance.

Inactive Publication Date: 2007-02-14
NISSHINBO IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, an electric double layer capacitor using a solid quaternary salt as the above-mentioned electrolyte salt has the problem that the quaternary salt is easily precipitated at low temperature, especially at an extremely low temperature of -20° C. or lower, and even if the quaternary salt does not precipitate , will also lead to a significant decrease in conductivity, which is the problem
[0009] In the case of using dialkylimidazolium salts belonging to ionic liquids in order to solve the above problems, the mixed system with inorganic salts is very sensitive to moisture in the air, and it is difficult to handle, and the melting point of imidazolium salts itself is not Not as low as desired, in addition, its potential window is narrow, which is its disadvantage

Method used

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Examples

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Embodiment

[0085] Hereinafter, the present invention will be described more specifically by giving synthesis examples, examples, and comparative examples, but the present invention is not limited to the following examples.

Synthetic example 1

[0086] [Synthesis Example 1] Synthesis of Compound (2)

[0087]

[0088] Mix 100 ml of diethylamine (manufactured by Kanto Chemical Co., Ltd.) and 85 ml of 2-methoxyethyl chloride (manufactured by Kanto Chemical Co., Ltd.), put the resulting mixed solution in an autoclave, and react at 100°C 24 hours. At this time, the internal pressure is 0.127MPa (1.3kgf / cm 2 ). After 24 hours, 200 ml of an aqueous solution in which 56 g of potassium hydroxide (manufactured by Katayama Chemical Industry Co., Ltd.) was dissolved was added to the mixture of the precipitated crystals and the reaction solution, and the organic layer separated into two layers was separated using a separating funnel. Furthermore, 100 ml of dichloromethane (manufactured by Wako Pure Chemical Industries, Ltd.) was added, and extraction operation was performed twice. The separated organic layers were combined, washed with saturated brine, dried by adding potassium carbonate (manufactured by Wako Pure Chemical I...

Synthetic example 2

[0091] [Synthesis Example 2] Synthesis of Compound (11)

[0092]

[0093] 100 ml of 2.0 M dimethylamine-THF solution (manufactured by Aldrich) and 9.1 ml of 2-methoxyethyl chloride (manufactured by Kanto Chemical Co., Ltd.) were mixed and reacted in an autoclave at 100° C. for 12 hours. At this time, the internal pressure is 0.36MPa (3.7kgf / cm 2 ). After 12 hours, crystals formed in the reaction solution were removed by filtration, and the filtrate was distilled to remove most of THF to obtain a transparent liquid of a dimethyl-2-methoxyethyl mixture.

[0094] To this liquid was added 8.0 ml of methyl iodide (manufactured by Wako Pure Chemical Industries, Ltd.) under ice-cooling, and the ice bath was removed, followed by stirring overnight. The obtained reactant was distilled under reduced pressure to obtain 3.04 g of oily 2-methoxyethylethyldimethylammonium iodide.

[0095] Then, weigh 2.28g of silver tetrafluoroborate, add 30ml of mixed solvent of chloroform: acetonitr...

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Abstract

Disclosed is an electric double layer capacitor which is excellent in rate characteristics and low-temperature characteristics while having a high capacitance even when an electrolyte solution containing a high-concentration ionic liquid is used. Specifically disclosed is an electric double layer capacitor comprising a pair of polarizable electrodes and an electrolyte solution. As the polarizable electrodes, there is used one mainly composed of an activated carbon which has the peak in the micropore radius distribution determined by the MP method within a range from 5.0×10 -10 to 1.0×10 -9 m. As the electrolyte solution, there is used an ionic liquid having a concentration of more than 2.0 mol / L.

Description

technical field [0001] The present invention relates to electric double layer capacitors. Background technique [0002] Non-aqueous electric double layer capacitors are expected to be used as energy storage devices for electric vehicles, auxiliary power supplies, etc. because they can be charged and discharged at high currents. [0003] Conventional non-aqueous electric double layer capacitors are composed of a positive electrode mainly composed of carbonaceous materials such as activated carbon, a polarizable electrode for the negative electrode, and a non-aqueous electrolyte. Performance and electrostatic capacity have a great influence. [0004] A nonaqueous electrolytic solution is composed of an electrolytic salt and a nonaqueous organic solvent, and various studies on combinations of these electrolytic salts and a nonaqueous organic solvent are currently being conducted. [0005] In particular, as electrolyte salt, quaternary ammonium salt (Patent Document 1: JP-A No...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058H01G9/038H01G9/035H01G11/24H01G11/58H01G11/62
CPCH01G11/58Y02T10/7022H01G9/035H01G9/058Y02E60/13H01G11/62H01G11/24H01G9/038Y02T10/70H01G11/34H01G11/22
Inventor 吉田浩佐藤贵哉增田现小谷美嗣饭塚俊辅
Owner NISSHINBO IND INC
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