Kcf Technologies Co., Ltd.

Sk Nexilis Co., Ltd.

Seung-Min Kim

Dae-Young Kim

Dae-young Kim

Jeong-Gil Lee

Soo-Yeol Kim

An electrolytic copper foil for a lithium secondary battery, which is applied as a negative electrode current collector of a lithium secondary battery, wherein when a correlation between a thermal treatment temperature of the electrolytic copper foil for a lithium secondary battery, which corresponds to a variable x, and an elongation increment ratio of the electrolytic copper foil for a lithium secondary battery, which corresponds to a variable y, is expressed as y=ax+b (100&#x2264;x&#x2264;200) on an x-y two-dimensional graph, the 'a' value is in the range of 0.0009 to 0.0610.

Electrolytic copper foil for lithium secondary battery and lithium secondary battery comprising the same

An electrolytic copper foil for a lithium secondary battery, which is applied as a negative electrode current collector of a lithium secondary battery, wherein after a thermal treatment at 300&#xb0; C. for 30 minutes, the electrolytic copper foil for a lithium secondary battery has an elongation of 5% to 30%.

An electrolytic copper foil for a lithium secondary battery, wherein a curl indicator C of the electrolytic copper foil, which is defined as 1.21&#x394;R+1.12&#x394;Cr+0.01&#x394;G, is 0 or above and 4.0 or below, where &#x394;R corresponds to an absolute value of a difference between roughness measured on a first surface of the electrolytic copper foil for a lithium secondary battery and roughness measured on a second surface thereof, &#x394;Cr corresponds to an absolute value of a difference between a chrome-deposited amount of an anti-corrosion layer formed on the first surface of the electrolytic copper foil for a lithium secondary battery and a chrome-deposited amount of an anti-corrosion layer formed on the second surface, and &#x394;G corresponds to an absolute value of a difference between glossiness measured on the first surface of the electrolytic copper foil for a lithium secondary battery and glossiness measured on the second surface.

An electrolytic copper foil for a lithium secondary battery has yield strength of 30 kgf/mmto 60 kgf/mm, a surface area ratio of 1 to 3, and a weight deviation of 3% or below.

Growing community of inventors

Osan-si, South Korea

Seung-Min Kim