Electrolyte solution for capacitors, electric double layer capacitor, and lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9646773-B2
Application number	US-201314387766-A
Country	US
Kind code	B2
Filing date	Mar 6, 2013
Priority date	Mar 27, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The present invention provides a highly conductive, highly voltage-resistant, and stable liquid electrolyte solution for capacitors which does not coagulate and is free from precipitation of salts in a wide temperature range, particularly at low temperatures, shows excellent electrical characteristics, and has excellent long-term reliability. The present invention also provides an electric double-layer capacitor and a lithium ion capacitor produced using the electrolyte solution for capacitors. The present invention relates to an electrolyte solution for capacitors including: an organic solvent; and a quaternary ammonium salt or lithium salt dissolved in the organic solvent, the organic solvent containing acetonitrile and a chain alkyl sulfonic compound represented by the formula (1):

wherein R 1 and R 2 , which may be the same as or different from each other, each independently represent a straight or branched chain C1-C4 alkyl group.

First claim

The invention claimed is:

1. A lithium ion capacitor produced using an electrolyte solution comprising:
an organic solvent; and
a quaternary ammonium salt or lithium salt dissolved in the organic solvent, the organic solvent containing acetonitrile, a chain alkyl sulfonic compound represented by the formula (1), and sulfolane represented by the formula (2):

wherein R 1 and R 2 , which may be the same as or different from each other, each independently represents a straight or branched chain C1-C4 alkyl group.

2. A lithium ion capacitor produced using an electrolyte solution comprising:
an organic solvent; and
a quaternary ammonium salt or lithium salt dissolved in the organic solvent, the organic solvent containing acetonitrile and a chain alkyl sulfonic compound represented by the formula (1):

wherein R 1 and R 2 , which may be the same as or different from each other, each independently represents a straight or branched chain C1-C4 alkyl group.

Assignees

• Sumitomo Seika Chemicals

Inventors

• Kobayashi Kazuyuki
• Yamamoto Noriko

Classifications

• H01G11/60

  characterised by the solvent · CPC title

• H01G11/54

  Electrolytes · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/62 Primary

  characterised by the solute, e.g. salts, anions or cations therein · CPC title

• H01G11/00

  Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof · CPC title