Power storage device and electronic device

• US 10,497,979 B2
• Filed: 09/30/2015
• Issued: 12/03/2019
• Est. Priority Date: 10/10/2014
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Ishikawa, Jun, Narita, Kazuhei, Oguni, Teppei, Uchida, Aya
• Primary Examiner(s): Chmielecki, Scott J.
• Application Number:
  US15/513,499
• Publication Number:
  US 20180233780A1
• Time in Patent Office: 1,525 Days
• Field of Search: None
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/60 characterised by the solvent
• CPC Class Codes: H01G 11/62 characterised by the solute, e.g. salts, anions or cations therein
• CPC Class Codes: H01G 11/64 characterised by additives
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2300/0045 Room temperature molten salts comprising at least one organic ion
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 4/662 Alloys collectors of lead alloys H01M4/685
• CPC Class Codes: H01M 4/663 containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02E 60/13 : Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

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.

Claims

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. The power storage device according to claim 22,

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.

24. The power storage device according to claim 22,

wherein the ionic liquid includes a cation containing a heteroaromatic ring.

25. The power storage device according to claim 22,

wherein the ionic liquid includes an imidazolium cation.

26. The power storage device according to claim 22,

wherein the ionic liquid includes a butylmethylimidazolium cation.

27. The power storage device according to claim 22,

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.

28. An electronic device comprising the power storage device according to claim 22.