Copper foil for current collector of lithium secondary battery
A technology for lithium secondary batteries and current collectors is applied in the field of copper foil for current collectors of lithium secondary batteries, which can solve problems such as decreased adhesion and battery capacity, and achieve the effect of excellent peel strength.
Active Publication Date: 2015-04-08
SK NEXILIS CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In other words, in such figure 1 Where the surface of the copper foil 10 shown in (a) is too smooth to provide good adhesion, the active material 20 may separate from the copper foil 10 during battery assembly operations or during battery operation periods, which can reduce battery capacity
Additionally, even if figure 1 In the case where voids 11 are formed at nodule clusters 30 of copper foil as shown in (b), adhesion may also decrease, and charge / discharge current may concentrate at a certain point
Method used
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Embodiment 3
[0037] Example 3 is similar to Example 5, except that the granulation treatment is performed before the anti-corrosion treatment.
Embodiment 4
[0038] Example 4 is similar to Example 5, except that the granulation treatment is performed before the anti-corrosion treatment. However, the current density of the grain formation treatment at this time was 1.2 times that of the conditions of Example 3.
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Abstract
A copper foil for a current collector of a lithium secondary battery is configured such that a nodule cluster having an inter-nodule aspect ratio of 0.001 to 2 is provided at a matte side formed on one surface of the copper foil, in aspect of a crystal structure, a ratio of a texture coefficient of a (200) surface to a sum of texture coefficients of a (111) surface and the (200) surface is 30 to 80%, the copper foil has a water contact angle of 90° or below, and impurity spots existing at the surface of the copper foil have a maximum diameter of 100 μm or less, and a minimal spacing distance between the impurity spots is 1 cm or more.
Description
[0001] Cross References to Related Applications [0002] This application claims priority under 35 USC 119(a) from Korean Patent Application No. 10-2010-0076976 filed in Korea on Aug. 10, 2010, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a copper foil for a current collector of a lithium secondary battery, and more particularly to a copper foil for a current collector of a lithium secondary battery having an improved structure to ensure There is sufficient adhesion between the current collector and the active material of the lithium secondary battery. Background technique [0004] Lithium secondary batteries have many advantages over other types of secondary batteries, such as high energy density, high operating voltage, excellent storage and excellent life, so lithium secondary batteries are widely used in applications such as personal computers, portable Various portable electronic devices su...
Claims
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IPC IPC(8): H01M4/66H01M4/70
CPCH01M4/661C25D1/04C25D3/38H01M4/75H01M10/0525Y02E60/10C23F15/00
Inventor 金旲映李秉光崔乘准
Owner SK NEXILIS CO LTD