Electrolyte solution and electrochemical device

Patent metadata

Field	Value
Publication number	US-10460882-B2
Application number	US-201515517268-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Oct 30, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The present invention aims to provide an electrolyte solution containing a quaternary ammonium salt as an electrolyte salt and is capable of providing an electrochemical device having a high capacitance retention and reducing generation of gas. The electrolyte solution of the present invention contains a solvent, a quaternary ammonium salt, and a nitrogen-containing unsaturated cyclic compound. The unsaturated cyclic compound is a nitrogen-containing unsaturated heterocyclic compound. The unsaturated cyclic compound excludes salts of the unsaturated cyclic compound and ionic liquids obtainable from the unsaturated cyclic compound.

First claim

The invention claimed is:

1. An electrolyte solution comprising:
a solvent;
a quaternary ammonium salt; and
a nitrogen-containing unsaturated cyclic compound,
the unsaturated cyclic compound being a nitrogen-containing unsaturated heterocyclic compound,
the unsaturated cyclic compound excluding salts of the unsaturated cyclic compound and ionic liquids obtainable from the unsaturated cyclic compound,
wherein the solvent contains 0.1 to 15 vol % of a sultone, a compound containing a sulfonyl group, a compound containing a sulfinyl group, a compound containing a sulfate group, or a compound containing sulfite group, and
wherein the quaternary ammonium salt is triethylmethylammonium tetrafluoroborate, tetraethylammonium tetrafluoroborate, or spirobipyrrolidinium tetrafluoroborate.

2. The electrolyte solution according to claim 1 ,
wherein the unsaturated cyclic compound accounts for 0.0005 to 5 mass % relative to the electrolyte solution.

3. The electrolyte solution according to claim 1 ,
wherein the unsaturated cyclic compound is at least one selected from the group consisting of pyrrole, pyridine, azirine, azepine, imidazole, pyrazole, oxazole, thiazole, imidazoline, pyrazine, thiazine, and indole, and any of these compounds containing a substituent.

4. The electrolyte solution according to claim 1 , which is intended to be used for an electrochemical device.

5. The electrolyte solution according to claim 1 , which is intended to be used for an electric double-layer capacitor.

6. An electrochemical device comprising:
the electrolyte solution according to claim 1 ;
a positive electrode; and
a negative electrode.

7. The electrochemical device according to claim 6 , which is an electric double-layer capacitor.

Assignees

• Daikin Ind Ltd

Inventors

• Takahashi Kenzou

Classifications

• C07C211/63

  having quaternised nitrogen atoms bound to acyclic carbon atoms · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• C01B35/063

  Tetrafluoboric acid; Salts thereof · CPC title

• C07D207/00

  Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom · CPC title

• H01G11/64

  characterised by additives · CPC title