Ionic liquid and power storage device including the same

Patent metadata

Field	Value
Publication number	US-9171677-B2
Application number	US-201514600135-A
Country	US
Kind code	B2
Filing date	Jan 20, 2015
Priority date	Jun 3, 2011
Publication date	Oct 27, 2015
Grant date	Oct 27, 2015

Abstract

An ionic liquid having high electrochemical stability and a low melting point. An ionic liquid represented by the following general formula (G0) is provided.

In the general formula (G0), R 0 to R 5 are individually any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, a methoxyethyl group, and a hydrogen atom, and A − is a univalent imide-based anion, a univalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, or hexafluorophosphate.

First claim

What is claimed is:

1. An ionic liquid represented by a general formula (G0),

wherein:
one of R 0 and R 5 is any of a methoxy group, a methoxymethyl group, and a methoxyethyl group;
the other of R 0 and R 5 is an alkyl group having 1 to 20 carbon atoms, or a hydrogen atom;
one or two of R 1 to R 4 are any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group;
the others of R 1 to R 4 are each a hydrogen atom; and
A − is a univalent imide-based anion, a univalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, or hexafluorophosphate.

2. The ionic liquid according to claim 1 , wherein A − is any one of univalent anions selected from (C n F 2n+1 SO 2 ) 2 N − (n=0 to 4), (C m F 2m+1 SO 3 )— (m=0 to 4), and CF 2 (CF 2 SO 2 ) 2 N—.

3. The ionic liquid according to claim 1 , wherein the one or two of R 1 to R 4 are each an alkyl group having 1 to 4 carbon atoms.

4. The ionic liquid according to claim 1 , wherein:
R 1 and R 2 are individually any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group, and
R 3 and R 4 are each a hydrogen atom.

5. The ionic liquid according to claim 4 , wherein R 1 and R 2 are individually an alkyl group having 1 to 4 carbon atoms.

6. The ionic liquid according to claim 1 , wherein:
R 1 is any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methyoxyethyl group, and
R 2 to R 4 are each a hydrogen atom.

7. The ionic liquid according to claim 1 , wherein:
R 2 is any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group, and
R 1 , R 3 and R 4 are each a hydrogen atom.

8. A power storage device comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution comprising an ionic liquid represented by a general formula (G0),

wherein:
one of R 0 and R 5 is any of a methoxy group, a methoxymethyl group, and a methoxyethyl group;
the other of R 0 and R 5 is an alkyl group having 1 to 20 carbon atoms, or a hydrogen atom;
one or two of R 1 to R 4 are any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group;
the others of R 1 to R 4 are each a hydrogen atom; and
A − is a univalent imide-based anion, a univalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, or hexafluorophosphate.

9. The power storage device according to claim 8 , wherein A − is any one of univalent anions selected from (C n F 2n+1 SO 2 ) 2 N − (n=0 to 4), (C m F 2m+1 SO 3 )— (m=0 to 4), and CF 2 (CF 2 SO 2 ) 2 N—.

10. The power storage device according to claim 8 , wherein the one or two of R 1 to R 4 are each an alkyl group having 1 to 4 carbon atoms.

11. The power storage device according to claim 8 , wherein:
R 1 and R 2 are individually any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group, and
R 3 and R 4 are each a hydrogen atom.

12. The power storage device according to claim 11 , wherein R 1 and R 2 are individually an alkyl group having 1 to 4 carbon atoms.

13. The power storage device according to claim 8 , wherein:
R 1 is any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methyoxyethyl group, and
R 2 to R 4 are each a hydrogen atom.

14. The power storage device according to claim 8 , wherein:
R 2 is any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group, and
R 1 , R 3 and R 4 are each a hydrogen atom.

15. The power storage device according to claim 8 , wherein the electrolyte solution further comprises an electrolyte salt including a lithium ion.

16. The power storage device according to claim 8 , wherein the power storage device is a lithium-ion capacitor or an electric double layer capacitor.

17. The power storage device according to claim 8 , wherein the power storage device is a lithium-ion secondary battery.

Assignees

• Semiconductor Energy Lab

Inventors

• Ito Kyosuke
• Itakura Toru

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• C07D207/06 Primary

  with radicals, containing only hydrogen and carbon atoms, attached to ring carbon atoms · CPC title