Electrode current collector, all solid state battery, and method for producing electrode current collector

Patent metadata

Field	Value
Publication number	US-10964953-B2
Application number	US-201916260467-A
Country	US
Kind code	B2
Filing date	Jan 29, 2019
Priority date	Feb 5, 2018
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A main object of the present disclosure is to provide an electrode current collector in which the peel-off of a coating layer and an aluminum oxide layer is inhibited. The present disclosure achieves the object by providing an electrode current collector to be used in an all solid state battery, the electrode current collector comprising: a current collecting layer, an aluminum oxide layer, and a coating layer containing a conductive material, a resin, and an inorganic filler, in this order; and the current collecting layer has a porous structure on a surface of the aluminum oxide layer side.

First claim

What is claimed is:

1. An electrode current collector to be used in an all solid state battery, the electrode current collector comprising:
a current collecting layer, an aluminum oxide layer, and a coating layer disposed in this order, the coating layer containing a conductive material, a resin, and an inorganic filler; and
a surface of the current collecting layer that faces the aluminum oxide layer has a porous structure,

wherein
the porous structure has porous parts having a bottle-neck structure including a large diameter part and a small diameter part which has a diameter that is smaller than a diameter of the large diameter part, and the small diameter part is positioned closer to the surface than the larger diameter part.

2. The electrode current collector according to claim 1 , wherein
the aluminum oxide layer includes an opening, and
the current collecting layer and the coating layer contact with each other in the opening.

3. The electrode current collector according to claim 1 , wherein a thickness of the aluminum oxide layer is in a range of 10 nm to 1000 nm.

4. The electrode current collector according to claim 1 , wherein the current collecting layer contains aluminum.

5. An all solid state battery comprising a cathode current collector, a cathode active material layer, a solid electrolyte layer, an anode active material layer, and an anode current collector in this order, wherein
at least one of the cathode current collector and the anode current collector is the electrode current collector according to claim 1 .

6. The electrode current collector according to claim 1 , wherein the porous structure does not completely penetrate through the current collecting layer.

7. An electrode current collector to be used in an all solid state battery, the electrode current collector comprising:
a current collecting layer, an aluminum oxide layer, and a coating layer disposed in this order, the coating layer containing a conductive material, a resin, and an inorganic filler; and
a side of the current collecting layer, which faces the aluminum oxide layer, has a surface roughness Ra of 0.8 μm or more, and has a porous structure, wherein the porous structure has porous parts having a bottle-neck structure including a large diameter part and a small diameter part which has a diameter that is smaller than a diameter of the large diameter part, and the small diameter part is positioned closer to the surface than the large diameter part.

8. The electrode current collector according to claim 7 , wherein the surface roughness Ra is smaller than a thickness of the current collecting layer.

9. A method for producing an electrode current collector to be used in an all solid state battery, the method comprising:
an aluminum oxide layer forming step of forming an aluminum oxide layer on one surface of a current collecting layer; and
a coating layer forming step of forming a coating layer containing a conductive material, a resin, and an inorganic filler, on one surface of the aluminum oxide layer; and
the one surface of the current collecting layer that faces the aluminum oxide layer has a porous structure,

wherein the porous structure has porous parts having a bottle-neck structure including a large diameter part and a small diameter part which has a diameter that is smaller than a diameter of the large diameter part, and the small diameter part is positioned closer to the surface than the large diameter part; and
the method further comprises a roughing treatment step of roughing the one surface of the current collecting layer before the aluminum oxide layer forming step, and
the roughing treatment is wet etching or dry etching.

10. The method for producing an electrode current collector according to claim 9 , wherein
the current collecting layer contains aluminum; and
the aluminum oxide layer is formed by a boehmite treatment in the aluminum oxide layer forming step.

11. The method for producing an electrode current collector according to claim 9 , wherein the porous structure does not completely penetrate through the current collecting layer.

12. A method for producing an electrode current collector to be used in an all solid state battery, the method comprising:
an aluminum oxide layer forming step of forming an aluminum oxide layer on one surface of a current collecting layer, and
a coating layer forming step of forming a coating layer containing a conductive material, a resin, and an inorganic filler, on one surface of the aluminum oxide layer; and
a surface roughness Ra in the one surface of the current collecting layer is 0.8 μm or more, and has a porous structure, wherein the porous structure has porous parts having a bottle-neck structure including a large diameter part and a small diameter part which has a diameter that is smaller than a diameter of the large diameter part, and the small diameter part is positioned closer to the surface than the large diameter part; and

wherein
the method further comprises a roughing treatment step of roughing the one surface of the current collecting layer before the aluminum oxide layer forming step, and
the roughing treatment is wet etching or dry etching.

13. The method for producing an electrode current collector according to claim 12 , wherein the surface roughness Ra is smaller than a thickness of the current collecting layer.

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsushita Yuki

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/80

  Porous plates, e.g. sintered carriers · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title