Electrode current collector

Patent metadata

Field	Value
Publication number	US-2026088305-A1
Application number	US-202319109346-A
Country	US
Kind code	A1
Filing date	Oct 19, 2023
Priority date	Oct 19, 2022
Publication date	Mar 26, 2026
Grant date	—

Abstract

An electrode current collector that includes a current collector body and a polymer layer formed on the current collector body, where the polymer layer includes a copolymer containing a first thiophene unit having a hydrocarbon group with 10 or more carbon atoms and a second thiophene unit having a hydrocarbon group with 9 or less carbon atoms, and the electrode current collector can exhibit excellent electrical characteristics, including low resistance, in a normal state in a secondary battery or the like, and can ensure stability through an increase in resistance in an abnormal state. Also provided are uses of the electrode current collector.

First claim

1 . An electrode current collector, comprising:
a current collector body; and a polymer layer formed on the current collector body, wherein the polymer layer comprises a copolymer containing a first thiophene unit having a hydrocarbon group with 10 or more carbon atoms, and a second thiophene unit having a hydrocarbon group with 9 or less carbon atoms.

2 . The electrode current collector according to claim 1 , wherein the hydrocarbon group is a linear or branched alkyl group, alkenyl group, or alkynyl group.

3 . The electrode current collector according to claim 1 , wherein the number of carbon atoms of the hydrocarbon group of the first thiophene unit is in a range of 10 to 20, and the number of carbon atoms of the hydrocarbon group of the second thiophene unit is in a range of 3 to 9.

4 . The electrode current collector according to claim 1 , wherein the copolymer comprises the thiophene unit having a hydrocarbon group with 10 or more carbon atoms and the thiophene unit having a hydrocarbon group with 9 or less carbon atoms in an amount of 80 mol % or more.

5 . The electrode current collector according to claim 1 , 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 in a range of 0.01 to 100.

6 . The electrode current collector according to claim 1 , 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 group with 10 or more carbon atoms, where at least one of R 1 and R 2 is the hydrocarbon 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 R 3 and R 4 are each independently hydrogen or the hydrocarbon group with 10 or more carbon atoms, where at least one of R 3 and R 4 is the hydrocarbon group with 10 or more carbon atoms;

wherein, R 5 and R 6 are each independently hydrogen or a hydrocarbon group with 9 or less carbon atoms, where at least one of R 5 and R 6 is the hydrocarbon 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 L 4 are each independently a single bond, an alkylene group, or an alkylidene group, and R 7 and R 8 are each independently hydrogen or the hydrocarbon group with 9 or less carbon atoms, where at least one of R 7 and R 8 is the hydrocarbon group with 9 or less carbon atoms.

7 . The electrode current collector according to claim 1 , wherein the copolymer further comprises a third thiophene unit having a polar functional group.

8 . The electrode current collector according to claim 7 , 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 4 is a single bond, an alkylene group, or an alkylidene group, L 3 is an alkylene group or an alkylidene group, R 5 is hydrogen or an alkyl group, and n is a number in a range of 1 to 10.

9 . The electrode current collector according to claim 7 , 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, where 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, and R 12 and R 13 are each independently hydrogen or the polar functional group, where at least one of R 12 and R 13 is the polar functional group.

10 . The electrode current collector according to claim 7 , wherein the third thiophene unit in the copolymer is included in an amount such that 1 mol to 500 mol of the first and second thiophene units exist per mole of the third thiophene unit.

11 . The electrode current collector according to claim 1 , wherein ΔR1 of Equation 1 below is 100 Ω·cm/° C. or more:

Δ
⁢
R
⁢
1

=

Max
⁢

{

(

R

n
+
5

/

R
n

)

/
5

}

[

Equation
⁢

1

]

wherein, R n is the DC resistance at any temperature n° C. within a range of 25° C. to 135° C., and R n+5 is the DC resistance at a temperature ((n+5° C.)) 5° C. higher than the temperature n° C., and Max {(R n+5 /R n )/5} is the maximum value among the (R n+5 /R n )/5 values confirmed within the temperature range of 25° C. to 135° C.

12 . The electrode current collector according to claim 11 , wherein the temperature of R n at which ΔR1 is confirmed is more than 80° C.

13 . The electrode current collector according to claim 1 , wherein ΔR2 of Equation 2 below is 10 Ω/° C. or more:

Δ
⁢
R
⁢
2

=

Max
⁢

{

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M2004/021

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

• H01M10/0525

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

• H01M4/667 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title