Copper foil with Anti-wrinkle property, electrode comprising same, secondary battery comprising same, and manufacturing method therefor
A technology of copper foil and copper layer, which is applied in the field of preventing copper foil from wrinkling, electrodes including the copper foil, secondary batteries including the electrode, and its manufacturing field, can solve problems such as copper foil difficulties, and achieve reduction of residual Stress, frizz prevention, frizz reduction effect
Pending Publication Date: 2022-01-11
SK NEXILIS CO LTD
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AI Technical Summary
Problems solved by technology
However, curling (curl) occurs as the copper foil becomes thinner, and defects such as tearing or wrinkle (wrinkle) of the copper foil occur due to curling of the edge (Edge) when the copper foil is rolled up. Difficulties with copper foil in the form of very thin film
Method used
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Examples
Experimental program
Comparison scheme
Effect test
manufacture example 1-4 and comparative example 1-4
[0231] Copper foil is manufactured using a foil making machine including an electrolytic cell 10 , a rotating cathode drum 12 disposed in the electrolytic cell 10 , and an anode plate 13 disposed apart from the rotating cathode drum 12 . Electrolyte 11 is copper sulfate solution. The copper ion concentration in electrolytic solution 11 is set as 87g / L, and the concentration of sulfuric acid is set as 110g / L, hydrogen peroxide (H 2 o 2 ) concentration is set to be maintained at 0.05 to 0.08ml / L, the temperature of the electrolyte is set to 55°C, and the current density is set to 60ASD.
[0232] In addition, the arsenic (As) ions (As) contained in the electrolytic solution 11 3+ and As 5+ ), the concentration of chlorine (Cl) and the concentration of organic additives are shown in Table 1 below.
[0233] Among the organic additives, bis-(3-sulfopropyl)-disulfide disodium salt (SPS) was used as gloss agent (component A), polyethylene glycol (PEG) was used as moderator (compon...
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Abstract
Provided in one embodiment of the present invention is a copper foil, which comprises a copper layer having a matte surface and a shiny surface, and an anticorrosive film arranged on the copper layer, and has a residual stress of 0.5-25 MPa on the basis of the absolute value thereof, wherein the copper layer comprises copper and carbon (C), the amount of carbon (C) in the copper layer is 2-20 ppm, the copper layer has a plane (111), a plane (200), a plane (220) and a plane (311) including crystalline particles, the ratio of the diffraction intensity of the plane (220) to the sum of the diffraction intensities of the plane (111), the plane (200), the plane (220) and the plane (311) is 10-40%, and the crystalline particles of the plane (220) have an average particle size of 70-120 nm at room temperature.
Description
technical field [0001] The present invention relates to a copper foil that is prevented from being wrinkled or curled, an electrode including the copper foil, a secondary battery including the electrode, and a manufacturing method thereof. Background technique [0002] A secondary battery is a type of energy converter that converts electrical energy into chemical energy and stores it, and converts the chemical energy into electrical energy when electricity is needed to generate electricity. Since the secondary battery can be recharged, it is also called a rechargeable battery. [0003] Among such secondary batteries, lithium secondary batteries have high operating voltage, high energy density, and excellent lifetime characteristics. In recent years, with the popularization of portable electronic devices such as smartphones and notebooks and the commercialization of electric vehicles, the demand for lithium secondary batteries has increased rapidly. Such a secondary battery...
Claims
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IPC IPC(8): H01M4/66H01M10/0525C25D1/04
CPCH01M4/661H01M10/0525C25D1/04C23C22/24C25D3/38C23C30/00C23C28/02C23C28/023C23C28/30C23C28/32C23C28/322C23C28/34C23C28/341C23C28/345H01M4/663H01M4/667Y02E60/10C25D5/48C23C28/321H01M4/0407H01M10/052H01M10/0567H01M10/0568H01M10/0569H01M2300/0028
Inventor 金善花李颜娜金昇玟
Owner SK NEXILIS CO LTD