Method for manufacturing anode for cable-type secondary battery, anode manufactured thereby, and cable-type secondary battery including same anode

Patent metadata

Field	Value
Publication number	US-11223037-B2
Application number	US-201816606389-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 1, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A method for manufacturing an anode for a cable-type secondary battery, includes forming a lithium-containing electrode layer on the outer surface of a wire-type current collector; and surrounding the outer surface of the lithium-containing electrode layer with a substrate for forming a polymer layer spirally, and pressing the outside of the substrate for forming a polymer layer to form a polymer layer on the lithium-containing electrode layer, wherein the polymer layer includes a hydrophobic polymer, an ion conductive polymer, and a binder for binding the hydrophobic polymer and the ion conductive polymer with each other. An anode obtained from the method and a cable-type secondary battery including the anode are also provided.

First claim

What is claimed is:

1. A method for manufacturing an anode for a cable-type secondary battery, comprising the steps of:
forming a lithium-containing electrode layer on the outer surface of a wire-type current collector; and
surrounding the outer surface of the lithium-containing electrode layer with a spirally wound substrate for forming a polymer layer, and tetra-lateral pressing the outside of the substrate for forming a polymer layer to form a polymer layer on the lithium-containing electrode layer,
wherein the polymer layer comprises a hydrophobic polymer, an ion conductive polymer, and a binder for binding the hydrophobic polymer and the ion conductive polymer with each other,
wherein the wire-type current collector is rotated around a longitudinal direction of the wire-type current collector while carrying out the tetra-lateral pressing, and
wherein the tetra-lateral pressing is carried out by co-rotating one or more press members that are in contact with the outside of the substrate for forming the polymer layer.

2. A method for manufacturing an anode for a cable-type secondary battery, comprising the steps of:
forming a lithium-containing electrode layer on the outer surface of a wire-type current collector;
surrounding the outer surface of the lithium-containing electrode layer with a spirally wound transfer film, wherein the transfer film has a release film and a polymer layer formed on one surface of the release film, and the polymer layer is in contact with the outer surface the lithium-containing electrode layer;
tetra-lateral pressing the outside of the transfer film to transfer the polymer layer to the lithium-containing electrode layer; and
removing the release film,
wherein the polymer layer comprises a hydrophobic polymer, an ion conductive polymer, and a binder for binding the hydrophobic polymer and the ion conductive polymer with each other,
wherein the wire-type current collector is rotated around a longitudinal direction of the wire-type current collector while carrying out the tetra-lateral pressing, and
wherein the tetra-lateral pressing is carried out by co-rotating one or more press members that are in contact with the outside of the transfer film for forming the polymer layer.

3. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the substrate for forming a polymer layer is a transfer film having a release film and a polymer layer formed on one surface of the release film; or a polymer layer film.

4. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein one or more press members are spaced apart from each other at the same interval.

5. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the pressing is carried out at a temperature of 80-100° C. under a pressure of 1.0-1.5 kg/cm 2 .

6. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the polymer layer has a thickness of 0.1-20 μm.

7. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the weight ratio of the hydrophobic polymer to the ion conductive polymer is 10:90 to 90:10.

8. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the binder is used in an amount of 0.1-2 parts by weight based on 100 parts by weight of the total weight of the polymer layer.

9. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the hydrophobic polymer is selected from polydimethylsiloxane (PDMS), polyacrylonitrile (PAN), polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE) and a combination thereof.

10. The method for manufacturing an anode for a cable-type secondary battery according to claim 1 , wherein the ion conductive polymer is selected from polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyethylene oxide (PEO) and a combination thereof.

11. The method for manufacturing an anode for a cable-type secondary battery according to claim 2 , wherein the release film is made of polyethylene terephthalate (PET).

12. A cable-type secondary battery, comprising:
an internal electrode extended along a longitudinal direction;
a separator layer formed to surround the internal electrode; and
an external electrode formed to surround the outer surface of the separator layer,
wherein the external electrode is the anode manufactured by the method for manufacturing an anode for a cable-type secondary battery according to claim 1 ,
wherein two or more external electrodes are disposed in parallel with each other on the outside of the separator layer in the longitudinal direction.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Jung-Hun
• Kang Dong-Hyeon
• Kang Sung-Joong
• Son Byoung-Kuk
• Uhm In-Sung
• Lee Dong-Chan
• Lee Yong-Hee
• Jang Min-Chul

Classifications

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M2004/025

  with shapes other than plane or cylindrical · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/75

  Wires, rods or strips · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title