Current collector

Patent metadata

Field	Value
Publication number	US-2026038843-A1
Application number	US-202318996828-A
Country	US
Kind code	A1
Filing date	Aug 2, 2023
Priority date	Aug 2, 2022
Publication date	Feb 5, 2026
Grant date	—

Abstract

A current collector and a use thereof is disclosed. The current collector is capable of forming an electrode, which does not affect performance and operation of a secondary battery by exhibiting, in a normal state, excellent electrical characteristics including low resistance, and can ensure stability by blocking, in an abnormal state, energization of an electrode assembly through resistance increase, and a use thereof. An electrode, an electrode assembly and a secondary battery comprising the current collector are also described.

First claim

1 . A current collector, comprising:
a current collector main body; and a polymer layer on one or both sides of the current collector main body, wherein the polymer layer comprises a conductive copolymer.

2 . The current collector according to claim 1 wherein a DC resistance of the current collector is 10,000Ω·cm or less at 25° C.

3 . The current collector according to claim 1 wherein an AC impedance of the current collector resistance is 1,000Ω or less at 25° C.

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

Δ
⁢
R
⁢
1

=

Max
⁢

{

(

R

n
+
5

/

R
n

)

/
5

}

[

Equation
⁢

1

]

wherein, the R n is a DC resistance at any temperature n° C. within a range of 25° C. to 135° C., and the R n+5 is a DC resistance at a temperature 5° C. higher than the temperature n° C., and the 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.

5 . The current collector according to claim 4 , wherein the temperature of R n at which the ΔR1 is identified is more than 80° C.

6 . The current collector according to claim 1 , wherein a ΔR2 value according to Equation 2 below is 10Ω/° C. or more:

Δ
⁢
R
⁢
2

=

Max
⁢

{

(

R

z
+
5

/

R
z

)

/
5

}

[

Equation
⁢

2

]

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

7 . The current collector according to claim 6 , wherein the temperature of R z at which the ΔR2 is identified is 80° C. or more.

8 . The current collector according to claim 1 , wherein an absolute value of according to Equation 3 is less than 10%:

Δ
⁢
R
⁢
3

=

1
⁢
0
⁢
0
×

(

C
1

-

C
2

)

/

C
1

[

Equation
⁢

3

]

wherein, the C 1 is a discharged capacity at 25° C., and the C 2 is a discharged capacity after storage at 70° C. for 60 hours.

9 . The current collector according to claim 1 , wherein an absolute value of ΔR4 according to Equation 4 below is 50% or more:

Δ
⁢
R
⁢
4

=

1
⁢
0
⁢
0
×

(

C
1

-

C
3

)

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M2200/106

  PTC · CPC title

• H01M4/663

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

• H01M4/667 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• C08G2261/1424

  containing ether groups, including alkoxy · CPC title