Method for manufacturing lithium electrode

Patent metadata

Field	Value
Publication number	US-2019319255-A1
Application number	US-201816467200-A
Country	US
Kind code	A1
Filing date	Jul 4, 2018
Priority date	Jul 26, 2017
Publication date	Oct 17, 2019
Grant date	—

Abstract

A method for manufacturing a lithium electrode, more particularly, a method for manufacturing a lithium electrode having a thin and uniform thickness by, when manufacturing the lithium electrode, first forming a protective layer capable of protecting lithium metal on the surface treated substrate with a plasma and corona process, and depositing lithium metal on the protective layer and then transferring the deposited lithium metal layer to a current collector. The energy density of the lithium secondary battery manufactured using the lithium electrode thus manufactured can be improved.

First claim

1 . A method of manufacturing a lithium electrode, comprising the following steps of,
(S1) surface-treating a first surface of a substrate by a plasma and corona process; (S2) coating a polymer for protecting lithium metal on the surface-treated substrate to form a protective layer; (S3) depositing lithium metal on the protective layer to form a lithium metal layer; and (S4) transferring the lithium metal layer with the protective layer to a current collector.

2 . The method of manufacturing the lithium electrode according to claim 1 , wherein the plasma and corona process is performed at a power of 0.6 kW or more and less than 1.5 kW.

3 . The method of manufacturing the lithium electrode according to claim 1 , wherein the substrate comprises at least one selected from the group consisting of polyethylene terephthalate (PET), polyimide (PI), poly(methylmethacrylate) (PMMA), cellulose tri-acetate (TAC), polypropylene, polyethylene and polycarbonate.

4 . The method of manufacturing the lithium electrode according to claim 1 , wherein the substrate has a release layer formed on at least the first surface thereof.

5 . The method of manufacturing the lithium electrode according to claim 4 , wherein the release layer comprises at least one selected from the group consisting of Si, melamine and fluorine.

6 . The method of manufacturing the lithium electrode according to claim 1 , wherein at least the first surface of the substrate is coated with oligomer block coatings.

7 . The method of manufacturing the lithium electrode according to claim 1 , wherein the deposition is performed by a method selected from the group consisting of evaporation deposition, chemical vapor deposition (CVD) and physical vapor deposition.

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

9 . The method of manufacturing the lithium electrode according to claim 1 , wherein the protective layer comprises at least one selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoroethylene copolymer, cycloolefin polymer, and styrene butadiene rubber-carboxymethyl cellulose (SBR-CMC).

10 . The method of manufacturing the lithium electrode according to claim 1 , wherein the current collector comprises one selected from the group consisting of copper, aluminum, nickel, titanium, sintered carbon, and stainless steel.

11 . The method of manufacturing the lithium electrode according to claim 1 , wherein the lithium electrode comprises
the current collector; the lithium metal layer formed on the current collector; and the protective layer formed on the lithium metal layer.

Assignees

• Lg Chemical Ltd

Inventors

• Youn Suk Il
• Son Byoungkuk
• Choi Junghun
• Jang Minchul

Classifications

• H01M4/1395 Primary

  of electrodes based on metals, Si or alloys · CPC title

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• H01M4/0428 Primary

  Chemical vapour deposition · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title