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.
CN1914700AInactive Publication Date: 2007-02-14NISSHINBO IND INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NISSHINBO IND INC
Publication Date
2007-02-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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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