Electrode Having Improved Safety and Method of Manufacturing the Same

Patent metadata

Field	Value
Publication number	US-2024204199-A1
Application number	US-202117916937-A
Country	US
Kind code	A1
Filing date	Nov 17, 2021
Priority date	Apr 15, 2021
Publication date	Jun 20, 2024
Grant date	—

Abstract

A an electrode having an improved safety,including: a current collector including a main body and an electrode tab formed at one side of the main body; a conductive coating layer which is formed on at least one surface of the current collector and includes a conducting polymer of which resistance increases when a temperature rises; and an electrode mixture layer which is formed on the conductive coating layer. Herein, the conductive coating layer is formed on a region including both the main body and the electrode tab.

First claim

1 . An electrode comprising:
a current collector including a main body and an electrode tab formed at one side of the main body; a conductive coating layer which is formed on at least one surface of the current collector and includes a conducting polymer of which resistance increases when a temperature rises; and an electrode mixture layer which is formed on the conductive coating layer, wherein the conductive coating layer is formed on a region including both the main body and the electrode tab.

2 . The electrode of claim 1 , wherein the conducting polymer includes a polythiophene-based polymer including at least one functional group of alkyl group, carboxyl group, hydroxy group, amine group, nitro group, ether group, or carbonyl group.

3 . The electrode of claim 1 , wherein the conducting polymer includes at least one of a polymerized unit represented by a following chemical formula 1 or a polymerized unit represented by a following chemical formula 2:

wherein each of R 1 and R 2 is independently a hydrogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a carboxyl group, a hydroxy group, an amine group, a nitro group, an ether group or a carbonyl group; and

wherein X is a functional group represented by a following chemical formula 3:

wherein Q is an oxygen or sulfur atom, R is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, and p is a natural number equal to or greater than 1.

4 . The electrode of claim 3 , wherein the polymerized unit represented by the chemical formula 2 is represented by a following chemical formula 4:

wherein each of L 1 and L 2 is independently a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, and each of R 3 and R 4 is independently a hydrogen, an alkyl group having 1 to 20 carbon atoms, a carboxyl group, a hydroxy group, an amine group, a nitro group, an ether group, or a carbonyl group.

5 . The electrode of claim 1 , wherein a thickness of the conductive coating layer is in a range of 10 nm to 5 μm.

6 . The electrode of claim 1 , wherein a pencil hardness of the conductive coating layer is in a range of 8B to 2H.

7 . The electrode of claim 1 , wherein the electrode mixture layer is formed on a region including the main body.

8 . An electrode assembly having a structure where at least one positive electrode and at least one negative electrode are laminated in a state that a separator is interposed therebetween,
wherein a positive electrode tab formed on the positive electrode and a negative electrode tab formed on the negative electrode are joined by welding, and wherein at least one of the positive electrode or the negative electrode is the electrode according to claim 1 .

9 . A secondary battery comprising the electrode assembly according to claim 8 and an electrolyte.

10 . A method of manufacturing an electrode, the method comprising:
preparing a current collector including a main body and an electrode tab formed at one side of the main body; coating a coating liquid, which is obtained by dissolving a conducting polymer of which resistance increases when a temperature rises, in an organic solvent, on the current collector; forming a conductive coating layer by drying the current collector having the coating liquid coated thereon; and forming an electrode mixture layer by coating an electrode mixture layer including an electrode active material, on the conductive coating layer, wherein the coating liquid is coated on a region including both the main body and the electrode tab.

11 . The method of claim 10 , wherein the conducting polymer includes at least one of a polymerized unit represented by a following chemical formula 1 or a polymerized unit represented by a following chemical formula 2:

wherein each of R 1 and R 2 is independently a hydrogen, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a carboxyl group, a hydroxy group, a amine group, a nitro group, an ether group or a carbonyl group; and

wherein X is a functional group represented by a following chemical formula 3:

wherein Q is an oxygen or sulfur atom, R is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, and p is a natural number equal to or greater than 1.

12 . The method of claim 11 , wherein the polymerized unit represented by the chemical formula 2 is represented by a following chemical formula 4:

wherein each of L 1 and L 2 is independently a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, and each of R 3 and R 4 is independently a hydrogen, an alkyl group having 1 to 20 carbon atoms, a carboxyl group, a hydroxy group, an amine group, a nitro group, an ether group, or a carbonyl group.

13 . The method of claim 10 , wherein a pencil hardness of the conductive coating layer is in a range of 8B to 2H.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kwon Soon Ho
• Park Sung Bin
• Jo Mi Ru
• Kang Joon Koo
• Kim Ki Hwan
• Kang Hyeong Seop

Classifications

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0525

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