阅读说明：本技术 制造电解铜箔的装置 (Apparatus for manufacturing electrolytic copper foil ) 是由 文载元 韩亨锡 庾亨均 彭纪薰 于 2018-11-07 设计创作，主要内容包括：根据本发明的制造电解铜箔的装置,该装置包括：电解池,该电解池包含电解液；内鼓,该内鼓安装在电解液中以部分浸没；外鼓,该外鼓形成为与内鼓的表面接触；对电极,该对电极位于电解池中同时与内鼓隔开预定距离；以及电源单元,该电源单元用于将内鼓和对电极电连接在一起。(An apparatus for manufacturing an electrolytic copper foil according to the present invention comprises: an electrolytic cell containing an electrolyte; an inner drum installed in the electrolyte to be partially submerged; an outer drum formed to contact a surface of the inner drum; a counter electrode located in the electrolytic cell while being spaced apart from the inner drum by a predetermined distance; and a power supply unit for electrically connecting the inner drum and the counter electrode together.)

1. An apparatus for manufacturing an electrolytic copper foil, the apparatus comprising:

an electrolytic cell containing an electrolyte;

an inner drum mounted to be partially immersed in the electrolyte;

an outer drum in contact with a surface of the inner drum;

a counter electrode positioned in the electrolytic cell and positioned a predetermined distance apart from the inner drum; and

a power supply unit electrically connected between the inner drum and the counter electrode.

2. The apparatus of claim 1, wherein:

the outer drum has a hollow tubular shape, and the inner drum is inserted into the outer drum.

3. The apparatus of claim 1, wherein:

the outer drum has a surface formed with a plurality of protrusions each having a predetermined shape.

4. The apparatus of claim 3, wherein:

the height of the protrusions is 0.5 to 10 μm.

5. The apparatus of claim 3, wherein:

the plurality of protrusions are arranged in such a manner that a predetermined interval is interposed between the respective protrusions.

6. The apparatus of claim 5, wherein:

the spacing between the protrusions is 5 to 100 μm.

7. The apparatus of claim 3, wherein:

a cross section of the protrusion taken in a direction perpendicular to the surface of the inner drum is a polygonal shape including a triangular shape and a quadrangular shape or a curved shape including a hemispherical shape.

8. The apparatus of claim 1, wherein:

the outer drum is formed of a conductive material.

9. The apparatus of claim 8, wherein:

the conductive material is any one selected from the group consisting of: ti-based material, Zr-based material, Fe-based material, Ni-based material, Pb-based material, C-based material, Si-based material or alloy thereof; or a conductive polymer material.

Technical Field

Cross Reference to Related Applications

This application claims priority and benefit from korean patent application No.10-2017-0148728, filed in the korean intellectual property office at 11/9/2017, the entire contents of which are incorporated herein by reference.

The present invention relates to an apparatus for manufacturing a copper foil, and more particularly, to an apparatus for manufacturing an electrolytic copper foil.

Background

The copper foil may be mainly used as a current collector of a secondary battery or a Printed Circuit Board (PCB). Such a copper foil has a small thickness and can be obtained by a method of immersing a drum in an electrolytic solution and precipitating copper. That is, the drum is immersed in an electrolytic solution containing copper ions, a current is allowed to flow in a pair of electrodes, and a copper thin film precipitated on the surface of the drum is separated, thereby obtaining a copper foil. In this case, the copper foil can be continuously manufactured by the rotation of the drum.

Meanwhile, the copper foil is produced on the surface of the drum and then separated, and is affected by the surface state of the drum.

That is, when there are foreign substances on the surface of the drum, the shape of the foreign substances may be transferred to the surface of the copper foil having a small thickness, or the grain growth of the copper may be non-uniform. Therefore, in a state where the other surface of the copper foil is in contact with the surface of the drum, one surface of the copper foil exposed to the air is not in contact with the other surface of the copper foil separated from the surface of the drum, and thus the surfaces of the copper foils have different shapes from each other.

When the copper foils have different surface characteristics, the surfaces of the copper foils may have different glossiness, and a difference in adhesion may occur. In particular, when a copper foil is used as a current collector of a secondary battery, the adhesion of an active material formed on the copper foil is reduced, resulting in a reduction in electrical characteristics of the secondary battery.

In order to solve these problems, as post-processing, a surface etching method, an additional coating method, or the like is performed, but the cost and the processing time are increased.

Disclosure of Invention

[ problem ] to

The present invention has been made in an effort to provide an apparatus for manufacturing an electrolytic copper foil, which can easily manufacture copper foils having surfaces of various shapes, if necessary, without additional post-processing.

[ solution ]

An exemplary embodiment of the present invention provides an apparatus for manufacturing an electrolytic copper foil, including: an electrolytic cell containing an electrolytic solution; an inner drum mounted to be partially immersed in the electrolyte; an outer drum in contact with a surface of the inner drum; a counter electrode positioned in the electrolytic cell and positioned to be spaced apart from the inner drum by a predetermined distance; and a power supply unit electrically connected between the inner drum and the counter electrode.

The outer drum may have a hollow tubular shape, and the inner drum may be inserted into the outer drum.

The outer drum may have a surface formed with a plurality of protrusions each having a predetermined shape.

The height of the protrusions may be 0.5 μm to 10 μm.

The plurality of protrusions may be arranged in such a manner that a predetermined interval is interposed between the respective protrusions.

The interval between the protrusions may be 5 μm to 100 μm.

A cross section of the protrusion taken in a direction perpendicular to the surface of the inner drum may be a polygonal shape including a triangular shape and a quadrangular shape or a curved shape including a hemispherical shape.

The outer drum may be formed of a conductive material.

The conductive material may be any one selected from the group consisting of: ti-based material, Zr-based material, Fe-based material, Ni-based material, Pb-based material, C-based material, Si-based material or alloy thereof; or a conductive polymer material.

[ advantageous effects ]

As in the present invention, when an outer drum is used, a copper foil can be manufactured without performing additional processing.

Further, by diversifying the shape of the roughness formed on the surface of the outer drum, copper foils having various surface characteristics can be easily manufactured.

Drawings

Fig. 1 is a schematic view illustrating an apparatus for manufacturing an electrolytic copper foil according to an exemplary embodiment of the present invention.

Fig. 2 is a cross-sectional view of a protrusion according to an exemplary embodiment of the present invention.

Fig. 3 is a view describing the arrangement of protrusions according to an exemplary embodiment of the present invention.

Fig. 4 is a view for describing a method of manufacturing a copper foil using the apparatus for manufacturing an electrolytic copper foil of fig. 1.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the invention. The present invention may, however, be embodied in many different forms and is not limited to the exemplary embodiments described herein.

For clarity of description of the present disclosure, portions that are not relevant to the description will be omitted, and like portions will be denoted by like reference numerals throughout the specification. In addition, "first", "second", "third", and the like may be used in order to avoid confusion between components.

In addition, the size and thickness of each component shown are randomly expressed for convenience of explanation, but the present invention is not limited thereto.

Hereinafter, an apparatus for manufacturing an electrolytic copper foil according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic view showing an apparatus for manufacturing an electrolytic copper foil according to an exemplary embodiment of the present invention, fig. 2 is a sectional view of a protrusion according to an exemplary embodiment of the present invention, and fig. 3 is a view describing the arrangement of a protrusion according to an exemplary embodiment of the present invention.

As shown in fig. 1, an apparatus 100 for manufacturing an electrolytic copper foil according to an exemplary embodiment of the present invention includes: a first rotating drum 10, an electrolytic bath 20 containing an electrolyte 22 and a second rotating drum 30, the first rotating drum 10 being partially immersed in the electrolyte 22.

In the apparatus 100 for manufacturing an electrolytic copper foil, a metal is precipitated in the form of a thin film on the surface of an electrode by allowing a current to flow between two electrodes, and the precipitated metal is separated from the electrode, thereby obtaining a metal thin film. The first drum 10 may be a metal, i.e. a negative electrode with copper precipitated.

The first rotating drum 10 includes an inner drum 10a and an outer drum 10 b. The outer drum 10b may have a hollow tubular shape, and the inner drum 10a may be inserted into the outer drum 10 b. In this case, it is preferable to insert the inner drum 10a into the outer drum 10b such that the outer surface of the inner drum 10a is in direct contact with the inner surface of the outer drum 10 b.

Therefore, the outer drum 10b may be formed by inserting the inner drum 10a into the outer drum 10b after the outer drum 10b is separately formed or by attaching a plate-shaped metal to the outside of the inner drum 10a to surround the outside of the inner drum 10 a.

In this case, the outer drum 10b may surround the inner drum 10a while closely adhering to the inner drum 10 a. The outer drum 10b may have a thickness (e.g., 1mm to 50mm) that may form roughness.

Meanwhile, one surface of the outer drum 10b has a rough pattern, and the rough pattern may be a pattern in which protrusions each have a predetermined shape and are regularly arranged.

As shown in fig. 2 and 3, the protrusions 12 may have a height that forms a pattern in the battery foil, and may be arranged with a space interposed therebetween. As an example, the protrusions 12 protrude from the surface of the outer drum 10b at a height H of 0.5 μm to 10 μm, and the interval S between adjacent protrusions may be 5 μm to 100 μm.

The cross-section of the protrusions 12 taken in a direction perpendicular to the surface of the inner drum may be a polygonal shape such as a triangle and a quadrangle, or a curved shape such as a hemisphere, an ellipse, and a circle.

The protrusions 12 may be formed in various ways. According to the desired shape of the protrusion 12, the protrusion may be formed by selectively using: for example, a mechanical polishing method, a polishing method, or the like is used for etching a metal; a deposition method in which a non-conductive material is disposed at a position opposite to a desired pattern on a conductive material, and partial deposition is performed; patterning, wherein a polymer frame is filled with a metal and the polymer is burned at high temperature to leave only the metal; and photolithography, in which a metal thin film is applied onto a precise polymer pattern and the polymer is removed to form a metal thin film pattern.

Referring to fig. 1, since the first drum 10 is rotated in a state where the first drum 10 is immersed in the electrolyte, as a material of the first drum 10, a corrosion-resistant and high-strength material, which is any one selected from the group consisting of: a metal material (such as a Ti-based material, a Zr-based material, an Fe-based material, a Ni-based material, or a Pb-based material), a non-metal material (such as a C-based material or a Si-based material), or an alloy thereof, or a conductive polymer material. In this case, the inner drum 10a and the outer drum 10b may be formed of different metals, but are not limited thereto, and may be formed of the same metal.

The electrolytic bath 20 contains an electrolyte 22 to form a copper foil, and a counter electrode 24 may be installed in the electrolytic bath 20. The counter electrode 24 is installed to face the negative electrode, and may be a cathode (cathode) of opposite polarity to the negative electrode.

The electrolyte 22 may be filled to contact the lower surface of the first rotary drum 10, and preferably, the electrolyte is filled to a height at which the contact area with the lower surface of the first rotary drum is maximum.

The counter electrode 24 may be formed along an outer circumferential surface of the first drum 10 having a circular cross section, and may have a hemispherical cross section in the form of surrounding a lower portion of the first drum 10. The counter electrode 24 is positioned to be spaced apart from the first drum 10 by a predetermined distance, and the electrolyte 22 may flow therebetween. The electrolyte 22 may be supplied by an externally installed pump 40 and may be circulated.

The electrolytic solution 22 may be an electrolytic solution containing copper sulfate as a main component, and the copper foil may be deposited by the reactions represented by the reaction formulae (i), (ii), and (iii).

(i)CuSO ₄+2e ^-+2H ⁺→Cu+H ₂SO ₄(reaction in a Drum)

(ii)H ₂O→2H ⁺+1/2O ₂+2e (reaction in counter electrode)

(iii)CuSO ₄+H ₂O→Cu+H ₂SO ₄+1/2O ₂(bulk reaction)

The thickness of the copper foil may vary depending on the concentration of the electrolyte 22, current density, etc., and for example, the thickness of the copper foil may be 5 μm to 100 μm.

The copper foil continuously discharged from the first drum 10 is wound around the second drum 30. A plurality of rollers (not shown) may be disposed between the first rotating drum 10 and the second rotating drum 30 to control the tension of the copper foil wound around the second rotating drum 30.

When the above-described apparatus for manufacturing an electrolytic copper foil is used, the copper foil 50 having a roughened surface can be manufactured.

Fig. 4 is a view for describing a method of manufacturing a copper foil using the apparatus for manufacturing an electrolytic copper foil of fig. 1.

Referring to fig. 4, an electrolytic solution 22 having copper sulfate as a main component is filled in the electrolytic bath 20, and the first rotary drum 10 is installed such that the lower portion of the first rotary drum 10 is partially immersed in the electrolytic solution of the electrolytic bath 20.

Further, when the first rotary drum 10 and the counter electrode 24 are electrically connected to each other and current is allowed to flow therebetween through the power supply unit 1000, copper is precipitated on the surface of the first rotary drum 10 by a reaction represented by the above reaction formula.

Copper is continuously precipitated during the rotation of the first drum 10, formed in a thin film form on the surface of the first drum 10, and wound around the second drum 30, thereby manufacturing a copper foil roll.

As in the above-described exemplary embodiments, by using the first rotary drum 10 including the outer drum having a specific pattern, the specific pattern formed on the surface of the outer drum can be transferred to the surface of the copper foil.

Since such roughness is uniformly formed on the surface of the copper foil, it is possible to prevent the surface of the conventional drum from being uneven due to the transfer of the polishing trace. Therefore, there is no additional process for treating the surface of the copper foil.

In addition, the uniform roughness formed on the surface of the copper foil can prevent the adhesive force of the copper foil from being reduced due to the uneven surface of the copper foil.

Therefore, the copper foil can be easily manufactured using the outer drum having the protrusions whose arrangement and shape are changed according to the desired adhesiveness and glossiness of the copper foil in consideration of various characteristics.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various changes and modifications can be made within the scope of the claims, the detailed description, and the attached drawings, and these changes naturally fall within the scope of the present invention.

< description of reference >

10: first rotary drum

10 a: inner drum

10 b: outer drum

20: electrolytic cell

30: second rotary drum

40: pump and method of operating the same

50: copper foil