Electrolytic copper foil proof against tear or wrinkle defects, electrode comprising same, secondary battery comprising same, and manufacturing method therefor
AssigneeSK Nexilis Co., Ltd.
InventorsSeung Min Kim, In Soo Jung, Young Tae Kim, Sang Hyun Jun
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Abstract
An embodiment of the present disclosure provides an electrolytic copper foil, which comprises a copper layer and has a valley mean roughness of 0.8 to 12.5, a texture coefficient of (220) face (TC(220)) of 0.49 to 1.28, a tensile strength of 25 to 51 kgf/mm2, and a weight deviation in lateral direction of 3% or less.
Claims12
An electrolytic copper foil that has a valley mean roughness of 0.8 to 12.5, a (220) texture coefficient [TC(220)] of 0.49 to 1.28, a tensile strength of 25 kgf/mm2 to 51 kgf/mm2, and a width direction weight deviation of 3% or less, the electrolytic copper foil comprising a copper layer,
- wherein a difference in surface roughness (Rz) between both surfaces of the electrolytic copper foil is 0.65 μm or less as measured according to JIS B 0601-2001 standards,
- wherein the width direction weight deviation is calculated according to Equation 1 below, and the valley mean roughness is calculated according to Equation 2 below:
- width direction weight deviation (%)=(standard deviation of weight/arithmetic mean of weight)×100, and [Equation 1]
- valley mean roughness(VMR)=[maximum valley depth of roughness profile (Rv)]/[surface roughness(Ra)] [Equation 2].
An electrode for a secondary battery, comprising:
- an electrolytic copper foil;
- and
- an active material layer disposed on the electrolytic copper foil,
- wherein the electrolytic copper foil includes a copper layer and has a valley mean roughness of 0.8 to 12.5, a (220) texture coefficient [TC(220)] of 0.49 to 1.28, a tensile strength of 25 kgf/mm2 to 51 kgf/mm2, and a width direction weight deviation of 3% or less,
- wherein a difference in surface roughness (Rz) between both surfaces of the electrolytic copper foil is 0.65 μm or less as measured according to JIS B 0601-2001 standards, and
- the width direction weight deviation is calculated according to Equation 1 below, and the valley mean roughness is calculated according to Equation 2 below:
- width direction weight deviation (%)=(standard deviation of weight/arithmetic mean of weight)×100, and [Equation 1]
- valley mean roughness(VMR)=[maximum valley depth of roughness profile (Rv)]/[surface roughness(Ra)] [Equation 2].
Dependencies are inferred from the claim text.