Back to results
US 12,763,334 B2Granted
Copper foil capable of preventing tear or wrinkle defects, electrode comprising the same, secondary battery comprising the same, and method for manufacturing the same
AssigneeSK Nexilis Co., Ltd.
InventorsShan Hua Jin, Min Seok Yoon
Life of this patent
Estimating the term…
Abstract
According to one embodiment of the present disclosure, there is provided a copper foil including a copper film including 99.9 wt % or more of copper, wherein the copper foil has a first stress factor in a range of 2.8 to 3.2, a second stress factor in a range of 2.5 to 3.0, and a third stress factor in a range of 3.5 to 4.5, and a method for manufacturing the copper foil.
Claims3
A copper foil comprising a copper film including 99.9 wt % or more of copper,
- wherein the copper foil has a first stress factor of 2.8 or more, a second stress factor of 2.5 or more, and a third stress factor of 3.5 or more,
- wherein the first stress factor is calculated by Equation 1,
- first
-
- stress
-
- factor
- =
- A
- /
- A
- ′
- +
- B
- /
- B
- ′
- +
- C
- /
- C
- ′
- ,
- [
- Equation
-
- 1
- ]
- the second stress factor is calculated by Equation 2,
- second
-
- stress
-
- factor
- =
- A
- /
- B
- +
- A
- ′
- /
- B
- ′
- ,
- [
- Equation
-
- 2
- ]
- and
- the third stress factor is calculated by Equation 3 below,
- third
-
- stress
-
- factor
- =
- A
- /
- C
- +
- A
- ′
- /
- C
- ′
- ,
- [
- Equation
-
- 3
- ]
- wherein A in Equation 1 is a stress at 50% elongation in a machine direction (MD direction),
- A′ in Equation 1 is a stress at 50% elongation in a transverse direction (TD direction),
- B in Equation 1 is a stress at 10% elongation in the MD direction,
- B′ in Equation 1 is a stress at 10% elongation in the TD direction,
- C in Equation 1 is a stress at 5% elongation in the MD direction, and
- C′ in Equation 1 is a stress at 5% elongation in the TD direction.
76 more elements
Dependencies are inferred from the claim text.