Electrolyte solution for electric double layer capacitor

Patent metadata

Field	Value
Publication number	US-9111694-B2
Application number	US-201113882584-A
Country	US
Kind code	B2
Filing date	Oct 21, 2011
Priority date	Nov 10, 2010
Publication date	Aug 18, 2015
Grant date	Aug 18, 2015

Abstract

The present invention provides an electric double layer capacitor having a high withstanding voltage, less deterioration, and excellent long-term reliability, especially an effect of suppressing expansion. The present invention relates to an electrolyte solution for an electric double layer capacitor. The solution comprises an electrolyte-salt-dissolving solvent (I) and an electrolyte salt (II). The electrolyte-salt-dissolving solvent (I) contains a fluorine-containing chain ether and a nitrile compound.

First claim

The invention claimed is:

1. An electrolyte solution for an electric double layer capacitor, comprising:
an electrolyte-salt-dissolving solvent (I); and
an electrolyte salt (II),
the electrolyte-salt-dissolving solvent (I) containing a fluorine-containing chain ether and a nitrile compound,
wherein the fluorine-containing chain ether is one or more compounds selected from the group consisting of HCF 2 CF 2 CH 2 OCF 2 CF 2 H, CF 3 CF 2 CH 2 OCF 2 CF 2 H, HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 , CF 3 CF 2 CH 2 OCF 2 CFHCF 3 , HCF 2 CF 2 CH 2 OCH 2 CFHCF 3 , and CF 3 CF 2 CH 2 OCH 2 CFHCF 3 ,
wherein the electrolyte salt (II) is a triethyl methylammonium salt, a tetraethyl ammonium salt, or a spirobipyridinium salt.

2. The electrolyte solution for an electric double layer capacitor according to claim 1 ,
wherein the nitrile compound is a compound represented by the following formula:
R 1 —(CN) n

wherein R 1 represents a C1-C10 alkyl group or a C1-C10 alkylene group; and n is an integer of 1 or 2.

3. The electrolyte solution for an electric double layer capacitor according to claim 2 ,
wherein the nitrile compound is at least one compound selected from the group consisting of acetonitrile, propionitrile, and glutaronitrile.

4. The electrolyte solution for an electric double layer capacitor according to claim 1 ,
wherein the ratio in volume between the nitrile compound and the fluorine-containing chain ether is 10/90 to 99/1.

5. An electric double layer capacitor, comprising:
the electrolyte solution according to claim 1 ;
a positive electrode; and
a negative electrode.

Assignees

• Takahashi Kenzou
• Koh Meiten
• Koyama Mai
• Yamamoto Emi
• Daikin Ind Ltd

Inventors

• Takahashi Kenzou
• Koh Meiten
• Koyama Mai
• Yamamoto Emi

Classifications

• H01G11/60 Primary

  characterised by the solvent · CPC title

• H01G11/58 Primary

  Liquid electrolytes · CPC title

• H01G9/035

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/30

  characterised by their material · CPC title