Ionic liquid and power storage device including the same

Patent metadata

Field	Value
Publication number	US-9997806-B2
Application number	US-201715440964-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Jun 3, 2011
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

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 formula (G0),

wherein R 0 and R 5 are individually any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group,
wherein two of R 1 to R 4 are each an alkyl group having 1 to 20 carbon atoms,
wherein the others of R 1 to R 4 are each a hydrogen atom,
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 − , and
wherein a cyclic quaternary ammonium molecule of the formula (G0) does not have a symmetry.

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

3. The ionic liquid according to claim 1 , wherein R 5 is an alkyl group having one carbon atom.

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

wherein R 0 and R 5 are individually any of an alkyl group having 1 to 20 carbon atoms, a methoxy group, a methoxymethyl group, and a methoxyethyl group,
wherein two of R 1 to R 4 are each an alkyl group having 1 to 20 carbon atoms,
wherein the others of R 1 to R 4 are each a hydrogen atom,
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 − , and
wherein a cyclic quaternary ammonium molecule of the formula (G0) does not have a symmetry.

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

6. The power storage device according to claim 4 , wherein R 5 is an alkyl group having one carbon atom.

7. The power storage device according to claim 4 ,
wherein the electrolyte solution further comprises an electrolyte salt including a lithium ion.

8. The power storage device according to claim 4 , wherein the power storage device is a capacitor.

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

10. The power storage device according to claim 4 , 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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01G11/52

  Separators · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01G11/60

  characterised by the solvent · CPC title