Current collector

Patent metadata

Field	Value
Publication number	US-2026094842-A1
Application number	US-202319112911-A
Country	US
Kind code	A1
Filing date	Oct 19, 2023
Priority date	Oct 19, 2022
Publication date	Apr 2, 2026
Grant date	—

Abstract

A current collector that includes a current collector body and a polymer layer formed on the current collector body, wherein the polymer layer can include a conductive polymer and a conductive material. The current collector can exhibit excellent electrical properties, including low resistance, in a normal state, and can ensure stability through an increase in resistance, and the like, in an abnormal state. Also provided are uses of the current collector.

First claim

1 . A current collector, comprising:
a current collector body; and a polymer layer formed on the current collector body, wherein the polymer layer comprises a conductive polymer and a conductive material.

2 . The current collector according to claim 1 , wherein an electrode active material in the polymer layer is present in an amount of 10 wt % or less.

3 . The current collector according to claim 1 , wherein the conductive polymer comprises a first thiophene unit having a hydrocarbon functional group with 10 or more carbon atoms, and a second thiophene unit having a hydrocarbon functional group with 9 or less carbon atoms.

4 . The current collector according to claim 3 , wherein the hydrocarbon functional group is a linear or branched alkyl group, alkenyl group, or alkynyl group.

5 . The current collector according to claim 3 , wherein the hydrocarbon functional group of the first thiophene unit has the number of carbon atoms in a range of 10 to 20, and the hydrocarbon functional group of the second thiophene unit has the number of carbon atoms in a range of 3 to 9.

6 . The current collector according to claim 3 , wherein the conductive polymer comprises the thiophene unit having a hydrocarbon functional group with 10 or more carbon atoms and the thiophene unit having a hydrocarbon functional group with 9 or less carbon atoms in an amount of 80 mol % or more.

7 . The current collector according to claim 3 , wherein a ratio M2/M1 of the mole number M2 of the second thiophene unit to the mole number M1 of the first thiophene unit is within a range of 0.01 to 100.

8 . The current collector according to claim 3 , wherein the first thiophene unit is represented by Formula 1 below, and the second thiophene unit is represented by Formula 3 below:

wherein R 1 and R 2 are each independently hydrogen or a hydrocarbon functional group with 10 or more carbon atoms, and wherein at least one of R 1 and R 2 is the hydrocarbon functional group with 10 or more carbon atoms, or R 1 and R 2 are linked to each other to form a divalent functional group of Formula 2 below:

wherein L 1 and L 2 are each independently a single bond, an alkylene group, or an alkylidene group, and wherein R 3 and R 4 are each independently hydrogen or the hydrocarbon functional group with 10 or more carbon atoms, and wherein at least one of R 3 and R 4 is the hydrocarbon functional group with 10 or more carbon atoms:

wherein R 5 and R 6 are each independently hydrogen or a hydrocarbon functional group with 9 or less carbon atoms, and wherein at least one of R 5 and R 6 is the hydrocarbon functional group with 9 or less carbon atoms, or R 5 and R 6 are linked to each other to form a divalent functional group of Formula 4 below:

wherein L 3 and La are each independently a single bond, an alkylene group, or an alkylidene group, wherein R 7 and R 5 are each independently hydrogen or the hydrocarbon functional group with 9 or less carbon atoms, and wherein at least one of R 7 and R 8 is the hydrocarbon functional group with 9 or less carbon atoms.

9 . The current collector according to claim 3 , wherein the conductive polymer further comprises a third thiophene unit having a polar functional group.

10 . The current collector according to claim 9 , wherein the polar functional group is a carboxyl group, a hydroxy group, an amino group, a cyano group, a nitro group, an ether group, or a functional group of Formula 5 below:

wherein L 5 is a single bond, an alkylene group, or an alkylidene group, wherein L 6 is an alkylene group or an alkylidene group, wherein R 9 is hydrogen or an alkyl group, and wherein n is a number in a range of 1 to 10.

11 . The current collector according to claim 9 , wherein the third thiophene unit is represented by Formula 6 below:

wherein R 10 and R 11 are each independently hydrogen or a polar functional group, and wherein at least one of R 10 and R 11 is the polar functional group, or R 10 and R 11 are linked to each other to form a divalent functional group of Formula 7 below:

wherein L 7 and L 8 are each independently a single bond, an alkylene group, or an alkylidene group, wherein R 12 and R 13 are each independently hydrogen or the polar functional group, and wherein at least one of R 12 and R 13 is the polar functional group.

12 . The current collector according to claim 9 , wherein the third thiophene unit in the conductive polymer is included in an amount such that 1 mol to 500 mol of the first and second thiophene units exist per 1 mol of the third thiophene unit.

13 . The current collector according to claim 1 , wherein R of Equation A below is 100 or more:

R
=

R

M
⁢
A
⁢
X

/

R

M
⁢
I
⁢
N

[

Equation
⁢

A

]

wherein R MAX is the maximum value of the EIS resistance of the polymer layer confirmed in a temperature range of 25° C. to 135° C., and R MIN is the minimum value of the EIS resistance of the polymer layer confirmed in a temperature range of 25° C. to 135° C.

14 . The current collector according to claim 13 , wherein R MAX is 9,000 ohms or more.

15 . The current collector according to claim 13 , wherein the temperature at which R MAX is confirmed is within a range of 80° C. to 135° C., and the temperature at which R MIN is confirmed is within a range of 25° C. to 80° C.

16 . The current collector according to claim 1 , wherein the conductive material is carbon particles, carbon fibers, graphene, graphite, carbon black, or carbon nanotubes.

17 . The current collector according to claim 1 , wherein the conductive material is surface-treated with a polyphenol-based compound.

18 . An electrode, comprising:
the current collector according to claim 1 ; and

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Song In Taek
• Kwon Soon Ho
• Park Sung Bin
• Kim Min Gyu
• Cho Woo Hyung
• Kang Joon Koo
• Kim Ki Hwan
• Park Eun Kyoung
• Koh Jong Kwan
• Choi Hyun Ju
• Yang Hee Myeong

Classifications

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• C08F28/06

  by a heterocyclic ring containing sulfur · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title