Film electrode, resin layer forming ink, inorganic layer forming ink, and electrode printing apparatus

Patent metadata

Field	Value
Publication number	US-11909031-B2
Application number	US-202218060045-A
Country	US
Kind code	B2
Filing date	Nov 30, 2022
Priority date	Mar 6, 2017
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A disclosed film electrode includes an electrode base, and an active material layer formed on the electrode base, and a resin layer adhering to at least one of a peripheral portion of the active material layer and a surface of the active material layer in a direction extending along a plane of the electrode base.

First claim

The invention claimed is:

1. An electrode, comprising:
an electrode base;
an active material layer formed on the electrode base; and
a polymer resin film layer adhering to at least one of a peripheral portion of the active material layer and a surface of the electrode base around the active material layer in a direction extending along a plane of the electrode base, wherein a resin in the polymer resin film layer is an acrylic compound having a (poly)ethylene oxide skeleton or an acrylic compound having a side chain soluble with respect to an electrolyte.

2. The electrode according to claim 1 , wherein the polymer resin film layer is an electrical insulating film and has at least one partial opening for ionic permeability.

3. The electrode according to claim 1 , wherein the polymer resin film layer is formed on both an entire surface of the active material layer, and the surface of the electrode base around the active material layer in the direction extending along the plane of the electrode base.

4. The electrode according to claim 1 , wherein the polymer resin film layer is selectively formed on one of a surface of a thin portion having a thickness of at least 20% of an average thickness of the active material layer, and a defect site penetrating through to the surface of the electrode base present in the active material layer.

5. The electrode according to claim 1 , wherein the active material layer is present in a vicinity of an end face of the electrode base, and
wherein the polymer resin film layer partially permeates the active material layer that is present in the vicinity of the end face of the electrode base.

6. The electrode according to claim 1 , wherein the polymer resin film layer has microscopic openings.

7. The electrode according to claim 1 , wherein the polymer resin film layer is formed on an entire surface of the active material layer.

8. The electrode according to claim 1 , wherein except for a terminal portion of the electrode base, at least one side of an electrode peripheral portion has
a length of the electrode base>a length of the active material layer.

9. The electrode according to claim 1 , wherein the polymer resin film layer is selectively formed in the vicinity of a terminal end of the electrode base by a liquid ejection head configured to eject a polymer resin film layer forming ink for forming the polymer resin film layer.

10. A method for manufacturing the electrode of claim 1 , the method comprising:
forming the active material layer on the electrode base, and
forming the polymer resin film layer on at least one of the peripheral portion of the active material layer and the surface of the electrode base around the active material layer in the direction extending along the plane of the electrode base.

11. The method according to claim 10 , wherein the active material layer is formed by applying an active material layer forming ink, and
drying the active material layer forming ink.

12. The method according to claim 10 , wherein the polymer resin film layer is formed by applying a polymer resin film layer forming ink comprising the resin, and
curing the polymer resin film layer forming ink.

13. The method according to claim 10 , wherein the polymer resin film layer is selectively formed in the vicinity of a terminal end of the electrode base by a liquid ejection head configured to eject a polymer resin film layer forming ink for forming the polymer resin film layer.

14. The method according to claim 12 , wherein the polymer resin film layer forming ink further comprises a soluble salt.

15. The method according to claim 12 , wherein the polymer resin film layer forming ink further comprises a blowing agent.

16. The method according to claim 12 , wherein the polymer resin film layer forming ink is obtained by dissolving at least one of the resin and a precursor of the resin in a liquid, and
the polymer resin film layer forming ink has viscosity of 150 mPa·s or less at room temperature and a surface tension that is in a range of 15 to 75 mN/m.

17. The method according to claim 16 , wherein the precursor comprises a polymerization initiator configured to initiate polymerization upon irradiation with at least one of ionizing radiation and infrared radiation, and a polymerizable compound.

18. The method according to claim 12 , wherein the polymer resin film layer forming ink at least comprises:
the resin,
a binding material, and
a solvent;
wherein the resin is dispersed in the solvent, the binding material is dispersed in the solvent or dissolved in the solvent, and the polymer resin film layer forming ink has viscosity of 150 mPa·s or less at room temperature and a surface tension that is in a range of 15 to 75 mN/m.

19. The electrode according to claim 1 , wherein ion permeability is achieved by adding a blowing agent to the resin, and heating the resin having the blowing agent after coating.

20. The electrode according to claim 1 , wherein ion permeability is achieved by adding a soluble salt to the resin, and immersing the resin having the soluble salt, after coating, in an electrolytic solution to dissolve the salt to form openings and pores.

Assignees

• Masuzawa Masahiro
• Ushirogochi Toru
• Yanagita Hideo
• Zama Yuu
• Yoshida Aya
• Takeuchi Shigeo
• Hirowatari Anna
• Kimura Okitoshi
• Matsuoka Kohji
• Takauji Keigo
• Ohkimoto Miku
• Ricoh Co Ltd

Inventors

• Masuzawa Masahiro
• Ushirogochi Toru
• Yanagita Hideo
• Zama Yuu
• Yoshida Aya
• Takeuchi Shigeo
• Hirowatari Anna
• Kimura Okitoshi
• Matsuoka Kohji
• Takauji Keigo
• Ohkimoto Miku

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/13 Primary

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

• H01M4/8832

  Ink jet printing · CPC title