ELECTRODE, POWER STORAGE DEVICE, AND ELECTRONIC EQUIPMENT

• US 20160204437A1
• Filed: 01/05/2016
• Published: 07/14/2016
• Est. Priority Date: 01/09/2015
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tajima, Ryota, MOMO, Junpei, YAMAKAJI, Masaki
• Granted Patent: US 10,770,729 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A flexible power storage device or a power storage device of which the capacity and cycle characteristics do not easily deteriorate even when the power storage device is curved is provided. An electrode in which an active material layer, a current collector, and a friction layer are stacked in this order is provided. Furthermore, a power storage device that includes the electrode as at least one of a positive electrode and a negative electrode is provided.

Claims

1. An electrode comprising:

a current collector;

an active material layer; and

a friction layer,

wherein the active material layer is on one side of the current collector, and the friction layer is on the other side of the current collector, and

wherein friction force acting on a surface of the friction layer is smaller than friction force acting on a surface of the current collector.

2. The electrode according to claim 1, wherein the friction layer comprises an organic film.

3. The electrode according to claim 2, wherein the organic film comprises fluororesin.

4. The electrode according to claim 1, wherein the friction layer comprises an inorganic film.

22. A power storage device comprising:

a first electrode;

a second electrode;

a third electrode;

a fourth electrode; and

an electrolytic solution,

wherein each of the first electrode and the second electrode is the electrode according to claim 1,

wherein each of the third electrode and the fourth electrode comprises an active material layer and a current collector overlapping with each other,

wherein the first electrode and the second electrode are configured to operate as one of a positive electrode and a negative electrode,

wherein the third electrode and the fourth electrode are configured to operate as the other of the positive electrode and the negative electrode,

wherein the friction layer in the first electrode is in contact with the friction layer in the second electrode,

wherein a side of the first electrode with the active material layer faces a side of the third electrode with the active material layer, and

wherein a side of the second electrode with the active material layer faces a side of the fourth electrode with the active material layer.

23. The power storage device according to claim 22, wherein a coefficient of static friction between the friction layer in the first electrode and the friction layer in the second electrode is smaller than a coefficient of static friction between the current collector in the first electrode and the current collector in the second electrode.

24. The power storage device according to claim 22, further comprising a flexible exterior body,

wherein the flexible exterior body encloses the first electrode, the second electrode, the third electrode, the fourth electrode, and the electrolytic solution.

25. The power storage device according to claim 22, wherein the flexible exterior body comprises a film.

5. A power storage device comprising:

a first electrode;

a second electrode; and

an electrolytic solution,

wherein the first electrode comprises a current collector, an active material layer, and a friction layer,

wherein the active material layer is on one side of the current collector, and the friction layer is on the other side of the current collector,

wherein friction force acting on a surface of the friction layer is smaller than friction force acting on a surface of the current collector,

wherein the first electrode is configured to operate as one of a positive electrode and a negative electrode, and

wherein the second electrode is configured to operate as the other of the positive electrode and the negative electrode.

6. The power storage device according to claim 5,

wherein the first electrode includes a first portion and a second portion,

wherein each of the first portion and the second portion includes the current collector, the active material layer, and the friction layer,

wherein the first portion and the second portion overlap with each other, and

wherein the friction layer in the first portion and the friction layer in the second portion are in contact with each other.

7. The power storage device according to claim 6, wherein a coefficient of static friction between the friction layer in the first portion and the friction layer in the second portion is smaller than a coefficient of static friction between the current collector in the first portion and the current collector in the second portion.

8. The power storage device according to claim 6, wherein a coefficient of static friction between the friction layer in the first portion and the friction layer in the second portion is less than or equal to 0.05.

9. The power storage device according to claim 5,

wherein the first electrode includes a first portion and a second portion,

wherein the first portion includes the current collector and the active material layer,

wherein the second portion includes the current collector, the active material layer, and the friction layer,

wherein the first portion and the second portion overlap with each other, and

wherein the current collector in the first portion and the friction layer in the second portion are in contact with each other.

10. The power storage device according to claim 9, wherein a coefficient of static friction between the current collector in the first portion and the friction layer in the second portion is smaller than a coefficient of static friction between the current collector in the first portion and the current collector in the second portion.

11. The power storage device according to claim 5,

wherein the second electrode comprises a second current collector, a second active material layer, and a second friction layer,

wherein the second active material layer is on one side of the second current collector, and the second friction layer is on the other side of the second current collector, and

wherein friction force acting on a surface of the second friction layer is smaller than friction force acting on a surface of the second current collector.

12. The power storage device according to claim 11,

wherein the second electrode includes a third portion and a fourth portion,

wherein each of the third portion and the fourth portion includes the second current collector, the second active material layer, and the second friction layer,

wherein the third portion and the fourth portion overlap with each other, and

wherein the second friction layer in the third portion and the second friction layer in the fourth portion are in contact with each other.

13. The power storage device according to claim 12, wherein a coefficient of static friction between the second friction layer in the third portion and the second friction layer in the fourth portion is smaller than a coefficient of static friction between the second current collector in the third portion and the second current collector in the fourth portion.

14. The power storage device according to claim 11,

wherein the second electrode includes a third portion and a fourth portion,

wherein the third portion includes the second current collector and the second active material layer,

wherein the fourth portion includes the second current collector, the second active material layer, and the second friction layer,

wherein the third portion and the fourth portion overlap with each other, and

wherein the second current collector in the third portion and the second friction layer in the fourth portion are in contact with each other.

15. The power storage device according to claim 14, wherein a coefficient of static friction between the second current collector in the third portion and the second friction layer in the fourth portion is smaller than a coefficient of static friction between the second current collector in the third portion and the second current collector in the fourth portion.

16. The power storage device according to claim 5, further comprising a separator between the first electrode and the second electrode.

17. The power storage device according to claim 16,

wherein the friction layer in the first electrode and the separator are in contact with each other, and

wherein a coefficient of static friction between the friction layer in the first electrode and the separator is smaller than a coefficient of static friction between the current collector in the first electrode and the separator.

18. The power storage device according to claim 5, wherein the power storage device has an accordion fold structure.

19. The power storage device according to claim 5, wherein the power storage device has a wound structure.

20. The power storage device according to claim 5, further comprising a flexible exterior body,

wherein the flexible exterior body encloses the first electrode, the second electrode, and the electrolytic solution.

21. The power storage device according to claim 20, wherein the flexible exterior body comprises a film.

26. The power storage device according to claim 5, wherein the power storage device has flexibility.

27. Electronic equipment comprising:

the power storage device according to claim 5; and

a housing having a curved portion.

28. Electronic equipment comprising:

the power storage device according to claim 5; and

a flexible housing.