Power storage device and electronic device

Patent metadata

Field	Value
Publication number	US-10497979-B2
Application number	US-201515513499-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Oct 10, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A power storage device with high capacity is provided. Alternatively, a power storage device with high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a long-life power storage device is provided.
A power storage device is characterized by comprising a separator, a first electrode, a second electrode, an electrolytic solution, in which the separator is provided between the first electrode and the second electrode, the first electrode includes an active material layer and a current collector, the first electrode includes a pair of coating films between which the current collector is sandwiched, the active material layer includes a region in contact with the current collector, the active material layer includes a region in contact with at least one of the pair of coating films, and the electrolytic solution includes an alkali metal salt and an ionic liquid.

First claim

The invention claimed is:

1. A power storage device comprising:
a positive electrode;
a separator;
a negative electrode; and
an electrolytic solution,
wherein the separator is provided between the positive electrode and the negative electrode,
wherein the positive electrode includes a positive electrode active material layer and a positive electrode current collector,
wherein the negative electrode includes a negative electrode current collector, a first negative electrode active material layer facing the positive electrode active material layer with the separator sandwiched therebetween, a second negative electrode active material layer facing the first negative electrode active material layer with the negative electrode current collector sandwiched therebetween, a first coating film in contact with the first negative electrode active material layer, and a second coating film in contact with the second negative electrode active material layer,
wherein the first coating film is formed by reaction between the electrolytic solution and the first negative electrode active material layer, and
wherein the electrolytic solution includes an alkali metal salt and an ionic liquid.

2. The power storage device according to claim 1 ,
wherein the first coating film includes at least one of an element included in the first negative electrode active material layer and an element included in the electrolytic solution, and
wherein the second coating film includes at least one of an element included in the second negative electrode active material layer and an element included in the electrolytic solution.

3. The power storage device according to claim 1 ,
wherein the ionic liquid includes a cation containing a heteroaromatic ring.

4. The power storage device according to claim 1 ,
wherein the ionic liquid includes an imidazolium cation.

5. The power storage device according to claim 1 ,
wherein the ionic liquid includes a butylmethylimidazolium cation.

6. The power storage device according to claim 1 ,
wherein the power storage device operates within at least one of a temperature range of −25° C. to 10° C. and a temperature range of 40° C. to 100° C.

7. An electronic device comprising the power storage device according to claim 1 .

8. A power storage device comprising:
a positive electrode;
a separator;
a negative electrode; and
an electrolytic solution,
wherein the separator is provided between the positive electrode and the negative electrode,
wherein the positive electrode includes a positive electrode active material layer and a positive electrode current collector,
wherein the negative electrode includes a negative electrode current collector, a first negative electrode active material layer facing the positive electrode active material layer with the separator sandwiched therebetween, a second negative electrode active material layer facing the first negative electrode active material layer with the negative electrode current collector sandwiched therebetween, a first coating film in contact with the first negative electrode active material layer, and a second coating film in contact with the second negative electrode active material layer,
wherein the first coating film is formed by reaction between the electrolytic solution and the first negative electrode active material layer,
wherein the electrolytic solution includes an alkali metal salt and an ionic liquid, and
wherein the positive electrode overlaps with the negative electrode, and an end portion of the negative electrode is aligned with or located inward from an end portion of the positive electrode.

9. The power storage device according to claim 8 ,
wherein the first coating film includes at least one of an element included in the first negative electrode active material layer and an element included in the electrolytic solution, and
wherein the second coating film includes at least one of an element included in the second negative electrode active material layer and an element included in the electrolytic solution.

10. The power storage device according to claim 8 ,
wherein the ionic liquid includes a cation containing a heteroaromatic ring.

11. The power storage device according to claim 8 ,
wherein the ionic liquid includes an imidazolium cation.

12. The power storage device according to claim 8 ,
wherein the ionic liquid includes a butylmethylimidazolium cation.

13. The power storage device according to claim 8 ,
wherein the power storage device operates within at least one of a temperature range of −25° C. to 10° C. and a temperature range of 40° C. to 100° C.

14. An electronic device comprising the power storage device according to claim 8 .

15. A power storage device comprising:
a separator;
a first electrode;
a second electrode; and
an electrolytic solution,
wherein the separator is provided between the first electrode and the second electrode,
wherein the first electrode includes an active material layer and a current collector,
wherein the first electrode includes a pair of coating films between which the current collector is sandwiched,
wherein the active material layer includes a region in contact with the current collector,
wherein the active material layer includes a region in contact with at least one of the pair of coating films,
wherein each of the pair of coating films is formed by reaction between the electrolytic solution and the active material layer, and
wherein the electrolytic solution includes an alkali metal salt and an ionic liquid.

16. The power storage device according to claim 15 ,
wherein the pair of coating films includes at least one of an element included in the active material layer and an element included in the electrolytic solution.

17. The power storage device according to claim 15 ,
wherein the ionic liquid includes a cation containing a heteroaromatic ring.

18. The power storage device according to claim 15 ,
wherein the ionic liquid includes an imidazolium cation.

19. The power storage device according to claim 15 ,
wherein the ionic liquid includes a butylmethylimidazolium cation.

20. The power storage device according to claim 15 ,
wherein the power storage device operates within at least one of a temperature range of −25° C. to 10° C. and a temperature range of 40° C. to 100° C.

21. An electronic device comprising the power storage device according to claim 15 .

22. A power storage device comprising:
a separator;
a first electrode;
a second electrode; and
an electrolytic solution,
wherein the separator is provided between the first electrode and the second electrode,
wherein the first electrode includes an active material layer and a current collector,
wherein the first electrode includes a pair of coating films between which the current collector is sandwiched,
wherein the active material layer includes a region in contact with the current collector,
wherein the active material layer includes a region in contact with at least one of the pair of coating films,
wherein each of the pair of coating films is formed by reaction between the electrolytic solution and the active material layer,
wherein the electrolytic solution includes an alkali metal salt and an ionic liquid, and
wherein the second electrode overlaps with the first electrode, and an end portion of the first electrode is aligned with or located inward from an end portion of the second electrode.

23

Assignees

• Semiconductor Energy Lab

Inventors

• Ishikawa Jun
• Narita Kazuhei
• Oguni Teppei
• Uchida Aya

Classifications

• H01M10/0525

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

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01G11/60

  characterised by the solvent · CPC title

• H01M4/366

  as layered products · CPC title