# US 2019/0245210 A1 · Electrode current collector, all solid state battery, and method for producing electrode current collector

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- Number: US 2019/0245210 A1
- Document ID: US20190245210A1
- Status: Published application
- Kind: A1
- Application number: 16/260,467
- Filed: 2019-01-29
- Published: 2019-08-08
- Earliest claimed: 2018-02-05
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Yuki MATSUSHITA
- Web page: https://patentgrep.com/patent/US20190245210A1

## CPC

- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 4/82: Multi-step processes for manufacturing carriers for lead-acid accumulators
- H01M 10/052: Li-accumulators
- H01M 10/0562: Solid materials
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/80: Porous plates, e.g. sintered carriers
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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.

## Claims

### Claim 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 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.

### Claim 2

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
a surface roughness Ra in the aluminum oxide layer side of the current collecting layer is 0.8 μm or more.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

The electrode current collector according to claim 1, wherein the current collecting layer contains an Al element.

### Claim 6 (depends on 1)

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.

### Claim 7

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 side 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 side of the aluminum oxide layer; and
the current collecting layer has a porous structure on a surface of the aluminum oxide layer side.

### Claim 8

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 side 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 side of the aluminum oxide layer; and
a surface roughness Ra in the aluminum oxide layer side of the current collecting layer is 0.8 μm or more.

### Claim 9 (depends on 7)

The method for producing an electrode current collector according to claim 7, further comprising a roughing treatment step of roughing a surface of the current collecting layer before the aluminum oxide layer forming step.

### Claim 10 (depends on 7)

The method for producing an electrode current collector according to claim 7, wherein
the current collecting layer contains an Al element; and
the aluminum oxide layer is formed by a boehmite treatment in the aluminum oxide layer forming step.