Electrode, power storage device, electronic device, and manufacturing method of electrode

Patent metadata

Field	Value
Publication number	US-11322745-B2
Application number	US-201514879330-A
Country	US
Kind code	B2
Filing date	Oct 9, 2015
Priority date	Oct 15, 2014
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Provided is an electrode including a current collector and an active material layer. The active material layer includes an active material, a film including silicone, a conductive additive, and a binder. The active material is in the form of a particle. The film including silicone covers at least part of the active material.

First claim

What is claimed is:

1. An electrode comprising:
a current collector; and
an active material layer,
wherein the active material layer includes an active material, a film of silicone, a conductive additive, and a binder,
wherein the active material comprises a first active material particle and a second active material particle,
wherein the film of silicone covers and is in contact with at least a part of the first active material particle,
wherein the film of silicone is any one of a linear polymer, a circular polymer and a branched polymer,
wherein the binder covers the part of the first active material particle with the film of silicone interposed between the binder and the part of the first active material particle,
wherein the first active material particle comprises a first region in contact with the second active material particle,
wherein the first active material particle comprises a second region in contact with the conductive additive, and
wherein the first active material particle comprises a third region in contact with the binder.

2. The electrode according to claim 1 , wherein the active material includes at least one of graphite, silicon, and silicon monoxide.

3. The electrode according to claim 1 , wherein the film of silicone includes a hydrophobic functional group.

4. The electrode according to claim 3 , wherein the hydrophobic functional group includes at least one of a phenyl group, an alkyl group, an alkoxy group, a carbonyl group, and an ester group.

5. The electrode according to claim 1 , wherein the film of silicone includes a hydrophilic functional group.

6. A power storage device comprising:
a first electrode; and
a second electrode,
wherein the first electrode is one of a positive electrode and a negative electrode,
wherein the second electrode is another one of the positive electrode and the negative electrode,
wherein the first electrode includes a current collector and an active material layer,
wherein the active material layer includes an active material, a silicone film, a conductive additive, and a binder,
wherein the active material comprises a first active material particle and a second active material particle,
wherein the silicone film covers and is in contact with at least a part of the first active material particle,
wherein the silicone film is any one of a linear polymer, a circular polymer and a branched polymer,
wherein the binder covers the part of the first active material particle with the silicone film interposed between the binder and the part of the first active material particle,
wherein the first active material particle comprises a first region in contact with the second active material particle,
wherein the first active material particle comprises a second region in contact with the conductive additive, and
wherein the first active material particle comprises a third region in contact with the binder.

7. An electronic device comprising:
the power storage device according to claim 6 ; and
at least one of a display panel, a light source, an operation key, a speaker, and a microphone.

8. The electrode according to claim 1 , wherein a thickness of the film of silicone is less than or equal to 5 nm.

9. The electrode according to claim 8 , wherein the thickness of the film of silicone is greater than or equal to 0.1 nm.

10. The power storage device according to claim 6 , wherein a thickness of the silicone film is less than or equal to 5 nm.

11. The power storage device according to claim 10 , wherein the thickness of the silicone film is greater than or equal to 0.1 nm.

12. An active material layer comprising:
an active material;
a silicone film;
a conductive additive; and
a binder,
wherein the active material comprises a first active material particle and a second active material particle,
wherein the silicone film covers and is in contact with at least a part of the first active material particle,
wherein the silicone film is any one of a linear polymer, a circular polymer and a branched polymer,
wherein the binder covers the part of the first active material particle with the silicone film interposed between the binder and the part of the first active material particle,
wherein a thickness of the silicone film is less than or equal to 5 nm,
wherein the first active material particle comprises a first region in contact with the second active material particle,
wherein the first active material particle comprises a second region in contact with the conductive additive, and
wherein the first active material particle comprises a third region in contact with the binder.

13. The active material layer according to claim 12 , wherein the thickness of the silicone film is greater than or equal to 0.1 nm.

14. The active material layer according to claim 12 , wherein the active material includes at least one of graphite, silicon, and silicon monoxide.

15. The active material layer according to claim 12 , wherein a material of the silicone film is a polymer having a hydrophobic functional group.

16. The active material layer according to claim 15 , wherein the hydrophobic functional group includes at least one of a phenyl group, an alkyl group, an alkoxy group, a carbonyl group, and an ester group.

17. The active material layer according to claim 12 , wherein a material of the silicone film is silicone having a hydrophilic functional group.

18. The power storage device according to claim 6 , further comprising:
a solid electrolyte between the first electrode and the second electrode.

19. The power storage device according to claim 6 , wherein the binder includes at least one of carboxymethyl cellulose and styrene-butadiene rubber.

20. The electrode according to claim 1 , wherein a material of the film of silicone has a polymer structure formed from dehydration condensation of silanol groups.

21. The power storage device according to claim 6 , wherein a material of the silicone film has a polymer structure formed from dehydration condensation of silanol groups.

22. The active material layer according to claim 12 , wherein a material of the silicone film has a polymer structure formed from dehydration condensation of silanol groups.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya
• Kuriki Kazutaka
• Nakagawa Ai

Classifications

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title