# US 11,444,273 B2 · Method for manufacturing lithium electrode

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- Number: US 11,444,273 B2
- Document ID: US11444273B2
- Status: Granted
- Kind: B2
- Application number: 16/467,923
- Filed: 2018-07-04
- Published: 2019-12-05
- Granted: 2022-09-13
- Earliest claimed: 2017-07-26
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Suk Il Youn; Byoungkuk Son; Junghun Choi; Minchul Jang
- Web page: https://patentgrep.com/patent/US11444273B2

## CPC

- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0423: {Physical vapour deposition}
- H01M 4/0428: {Chemical vapour deposition}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/66: Selection of materials
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- 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 method for preparing a lithium electrode, and in particular, a lithium electrode having a thin and uniform thickness may be prepared by forming a protective layer capable of protecting lithium metal on a substrate first, depositing lithium metal on the protective layer, and then transferring the deposited lithium metal layer on a current collector, for instance a Cu current collector, when preparing a lithium electrode, and a lithium secondary battery using the lithium electrode prepared as above may have enhanced energy density.

## Claims

### Claim 1

A method for preparing a lithium electrode comprising:
(S1) forming a release layer on a first surface of a substrate and forming a release layer on a second surface of the substrate,
wherein the release layer comprises one or more types selected from the group consisting of Si, melamine and fluorine;
(S2) forming a protective layer on the release layer formed on the first surface of the substrate,
wherein the protective layer is consisting of one or more types selected from the group consisting of polyvinylidene fluoride (PVDF), a polyvinylidene fluoride-hexafluoroethylene (PVDF-HFP) copolymer, a cycloolefin copolymer and styrene butadiene rubber-carboxymethyl cellulose (SBR-CMC);
(S3) forming a lithium metal layer by depositing lithium metal on the protective layer; and
(S4) winding a structure formed by subsequently laminating the substrate, the protective layer and the lithium metal layer and then transferring the structure on a current collector using a roll press for the lithium metal layer of the structure to be on the current collector.

### Claim 2 (depends on 1)

The method for preparing the lithium electrode of claim 1, wherein the substrate comprises one or more types selected from the group consisting of polyethylene terephthalate (PET), polyimide (PI), poly(methyl methacrylate) (PMMA), cellulose tri-acetate (TAC), polypropylene, polyethylene and polycarbonate.

### Claim 3 (depends on 1)

The method for preparing the lithium electrode of claim 1, wherein an oligomer block coating is coated on at least the first surface of the substrate.

### Claim 4 (depends on 1)

The method for preparing the lithium electrode of claim 1, wherein depositing lithium metal on the protective layer is performed using a method selected from the group consisting of a vacuum deposition method, chemical vapor deposition method (CVD) and a physical vapor deposition method.

### Claim 5 (depends on 1)

The method for preparing the lithium electrode of claim 1, wherein the lithium metal layer has a thickness of 5 μm to 50 μm.

### Claim 6 (depends on 1)

The method for preparing the lithium electrode of claim 1, wherein the current collector comprises one type selected from the group consisting of copper, aluminum, nickel, titanium, baked carbon and stainless steel.

### Claim 7 (depends on 1)

The method for preparing the lithium electrode of claim 1, the lithium electrode comprising:
the current collector;
the lithium metal layer formed on the current collector; and
the protective layer formed on the lithium metal layer.