Lithium electrode, method for manufacturing same, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11735717-B2
Application number	US-202217988226-A
Country	US
Kind code	B2
Filing date	Nov 16, 2022
Priority date	Dec 4, 2017
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A lithium electrode and a lithium secondary battery including the same. By using an olefin-based ion conducting polymer as a protective layer-forming material of a lithium electrode having a protective layer formed on a lithium metal layer, the lithium electrode may be protected from moisture or open air during a lithium electrode preparation process, lithium dendrite formation and growth from the lithium electrode may be prevented, and performance of a battery using the lithium electrode may be enhanced.

First claim

The invention claimed is:

1. A lithium electrode comprising:
a lithium metal layer; and
a protective layer formed on at least one surface of the lithium metal layer,
wherein the protective layer comprises an olefin-based ion conducting polymer, and
wherein the olefin-based ion conducting polymer comprises polyethylene naphthalate.

2. The lithium electrode of claim 1 , wherein the protective layer has an ion conductivity of 10 −6 S/cm to 10 −1 S/cm.

3. The lithium electrode of claim 1 , wherein the protective layer has a thickness of 0.01 μm to 50 μm.

4. The lithium electrode of claim 1 , further comprising:
a current collector,
wherein the lithium metal layer is formed on one surface of the current collector.

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

6. A method for preparing a lithium electrode comprising:
transferring a lithium metal layer or a protective layer,
wherein the protective layer comprises an olefin-based ion conducting polymer formed therein, and
wherein the olefin-based ion conducting polymer comprises polyethylene naphthalate.

7. The method for preparing a lithium electrode of claim 6 , comprising:
(S 1 ) forming a protective layer by coating an olefin-based ion conducting polymer on a substrate;
(S 2 ) forming a lithium metal layer by depositing lithium metal on the protective layer; and
(S 3 ) transferring the lithium metal layer on a current collector.

8. The method for preparing a lithium electrode of claim 6 , comprising:
(P 1 ) forming a protective layer by coating an olefin-based ion conducting polymer on a substrate; and
(P 2 ) transferring the protective layer on a lithium metal layer.

9. The method for preparing a lithium electrode of claim 8 , wherein the lithium metal layer comprises rolled lithium.

10. The method for preparing a lithium electrode of claim 7 , wherein a release layer is formed on at least one surface of the substrate.

11. The method for preparing a lithium electrode of claim 8 , wherein a release layer is formed on at least one surface of the substrate.

12. The method for preparing a lithium electrode of claim 10 , wherein the release layer comprises one or more selected from the group consisting of Si, melamine and fluorine.

13. The method for preparing a lithium electrode of claim 11 , wherein the release layer comprises one or more selected from the group consisting of Si, melamine and fluorine.

14. A lithium secondary battery comprising the lithium electrode of claim 1 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Youn Suk Il
• Son Byoungkuk
• Choi Junghun
• Choi Woongchul
• Jang Minehul

Classifications

• H01M4/1395 Primary

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

• H01M4/366

  as layered products · CPC title

• H01M4/661

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title