# US 2019/0198880 A1 · Electrode current collector and all solid state battery

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- Number: US 2019/0198880 A1
- Document ID: US20190198880A1
- Status: Published application
- Kind: A1
- Application number: 16/210,359
- Filed: 2018-12-05
- Published: 2019-06-27
- Earliest claimed: 2017-12-27
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Yuki MATSUSHITA
- Web page: https://patentgrep.com/patent/US20190198880A1

## CPC

- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0562: Solid materials
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- 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 an Al—F bond is present in the aluminum oxide layer.

## 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
an Al—F bond is present in the aluminum oxide layer.

### Claim 2 (depends on 1)

The electrode current collector according to claim 1, wherein the resin contains a fluorine element.

### 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:
a preparing step of preparing a precursor member including a current collecting layer and an aluminum oxide layer; and
a coating layer forming step of forming a coating layer by pasting a composition containing a conductive material, a resin, and an inorganic filler, as well as a fluorine element, on a surface of the aluminum oxide layer side of the precursor member, and followed by conducting a heat treatment; wherein
an Al—F bond is formed in the aluminum oxide layer by the heat treatment in the coating layer forming step.

### Claim 8 (depends on 7)

The method for producing an electrode current collector according to claim 7, wherein a temperature for the heat treatment in the coating layer forming step is 85° C. or more.