Ionic liquid, nonaqueous electrolyte, and power storage device

Patent metadata

Field	Value
Publication number	US-9252459-B2
Application number	US-201213719542-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	Dec 23, 2011
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A nonaqueous electrolyte of the present invention includes an ionic liquid including a first alicyclic quaternary ammonium cation having one or more substituents, a second alicyclic quaternary ammonium cation having an alicyclic skeleton that is the same as an alicyclic skeleton of the first alicyclic quaternary ammonium cation, and a counter anion to the first alicyclic quaternary ammonium cation and the second alicyclic quaternary ammonium cation and an alkali metal salt. In the second alicyclic quaternary ammonium cation, one of substituents bonded to a nitrogen atom in the alicyclic skeleton is a substituent including a halogen element. In the ionic liquid, the amount of a salt including the second alicyclic quaternary ammonium cation is less than or equal to 1 wt % per unit weight of the ionic liquid, or is less than or equal to 0.8 wt % per unit weight of the nonaqueous electrolyte.

First claim

What is claimed is:

1. An ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G1);
an alicyclic quaternary ammonium cation represented by General Formula (G2); and
an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, and hexafluorophosphate,
wherein an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G2) is more than 0 wt % and less than or equal to 1 wt % per unit weight of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G1) and the salt including the alicyclic quaternary ammonium cation represented by General Formula (G2),

wherein, in Chemical Formula 1, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,

wherein, in Chemical Formula 2, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.

2. A nonaqueous electrolyte comprising:
an ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G1);
an alicyclic quaternary ammonium cation represented by General Formula (G2); and
an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, and hexafluorophosphate, and
an alkali metal salt,

wherein, in the ionic liquid, an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G2) is more than 0 wt % and less than or equal to 1 wt % per unit weight of the ionic liquid,

wherein, in Chemical Formula 3, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,

wherein, in Chemical Formula 4, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.

3. The nonaqueous electrolyte according to claim 2 , wherein the alkali metal salt is a lithium salt.

4. A power storage device comprising a positive electrode, a negative electrode, and the nonaqueous electrolyte according to claim 2 .

5. The ionic liquid according to claim 1 , wherein the anion is bis(fluorosulfonyl) amide.

6. An ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G3);
an alicyclic quaternary ammonium cation represented by General Formula (G4); and
an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, and hexafluorophosphate,
wherein an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G4) is more than 0 wt % and less than or equal to 1 wt % per unit weight of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G3) and the salt including the alicyclic quaternary ammonium cation represented by General Formula (G4),

wherein, in Chemical Formula 5, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,
wherein, in Chemical Formula 5, R 6 and R 7 each represent an alkyl group having 1 to 4 carbon atoms, and
wherein in Chemical Formula 5, R 6 and R 7 do not comprise halogen,

wherein, in Chemical Formula 6, R 1 to R 5 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,
wherein, in Chemical Formula 6, R 6 represents an alkyl group having 1 to 4 carbon atoms, and
wherein, in Chemical Formula 6, X represents halogen.

7. The ionic liquid according to claim 6 , wherein the amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G4) is more than 0 wt % and less than or equal to 0.8 wt % per unit weight of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G3) and the salt including the alicyclic quaternary ammonium cation represented by General Formula (G4).

8. A power storage device comprising a positive electrode, a negative electrode, and the ionic liquid according to claim 6 .

9. The power storage device according to claim 8 , further comprising a lithium salt.

10. An electrical appliance comprising the power storage device according to claim 8 .

11. An ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G7);
an alicyclic quaternary ammonium cation represented by General Formula (G8); and
an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sufonic acid anion, tetrafluoroborate, and hexafluorophosphate,
wherein an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G8) is more than 0 wt % and less than or equal to 1 wt % per unit weight of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G7) and the salt including the alicyclic quaternary ammonium cation represented by General Formula (G8),

wherein, in Chemical Formula 7, R 1 to R 4 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,

wherein, in Chemical Formula 8, R 1 to R 4 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.

12. The ionic liquid according to claim 11 , wherein the anion is bis(fluorosulfonyl)amide anion.

13. A nonaqueous electrolyte comprising:
an ionic liquid comprising:
an alicyclic quaternary ammonium cation represented by General Formula (G7);
an alicyclic quarternary ammonium cation represented by General Formula (G8); and
an anion selected from any of a monovalent imide-based anion, a monovalent methide-based anion, a perfluoroalkyl sulfonic acid anion, tetrafluoroborate, and hexafluorophoshate, and
an alkali metal salt,

wherein, in the ionic liquid, an amount of a salt including the alicyclic quaternary ammonium cation represented by General Formula (G8) is more than 0 wt % and less than or equal to 1 wt % per unit weight of ionic liquid,

wherein, in the Chemical Formula 9, R 1 to R 4 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,

wherein, in Chemical Formula 10, R 1 to R 4 each represent a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.

14. The nonaqueous electrolyte according to claim 13 , wherein the alkali metal salt is a lithium salt.

15. A power storage device comprising a positive electrode, a ne

Assignees

• Semiconductor Energy Lab
• Semiconductor Energy Co Ltd

Inventors

• Itakura Toru
• Ito Kyosuke
• Yokoi Rie
• Ishikawa Jun

Classifications

• H01M2300/0045

  Room temperature molten salts comprising at least one organic ion · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title