KR101386675B1 - A Fabricating Method of A Current Collector for a battery comprising a Metal Mesh - Google Patents

Abstract

The invention provides a base substrate; Providing a metal mesh layer comprising a plurality of metal mesh patterns and holes positioned between the metal mesh patterns; Forming an adhesive layer on the metal mesh layer; And positioning the adhesive layer on the base substrate and compressing the adhesive layer, wherein the active material is applied onto the metal mesh layer through the holes of the metal mesh layer. By increasing the contact area between the layer and the active material, it is possible to suppress detachment of the active material from the current collector, thereby improving cycle life characteristics of the battery.

Description

A fabricating method of a current collector for a battery comprising a metal mesh

The present invention relates to a method for manufacturing a battery current collector including a metal mesh layer, and more particularly, to a method for manufacturing a current collector for battery including a metal mesh layer capable of preventing detachment of an active material.

As miniaturization and light weight of portable electronic devices have recently advanced, the necessity for miniaturization and high capacity of batteries used as driving power sources thereof is increasing. In particular, the lithium secondary battery has an operating voltage of 3.6 V or more, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for portable electronic devices, and rapidly expands in terms of high energy density per unit weight. There is a trend.

Lithium secondary batteries generate electrical energy by oxidation and reduction reactions when lithium ions are intercalated / deintercalated at the positive and negative electrodes. A lithium secondary battery is prepared by using a material capable of reversibly intercalating / deintercalating lithium ions as an active material of a positive electrode and a negative electrode, and filling an organic electrolyte or a polymer electrolyte between the positive electrode and the negative electrode.

A lithium secondary battery includes an electrode assembly in which a negative electrode plate and a positive electrode plate are wound in a form such as a jelly-roll with a separator interposed therebetween, a can containing the electrode assembly and the electrolyte, and a can of the can It consists of a cap assembly assembled to the top.

In this case, the negative electrode plate and the positive electrode plate may be formed by coating each active material, that is, a negative electrode active material or a positive electrode active material on each current collector, for example, a negative electrode current collector or a positive electrode current collector.

However, in such a lithium secondary battery, the active material is detached from the current collector while repeating the charging and discharging of several tens to hundreds of times, thereby deteriorating battery efficiency.

Korea Patent Publication 10-2010-0090068

An object of the present invention is to provide a method for manufacturing a current collector for secondary batteries that can prevent the positive electrode active material or negative electrode active material from being detached from the negative electrode current collector or the positive electrode current collector.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

The present invention provides a base substrate to solve the above-mentioned problems; Providing a metal mesh layer comprising a plurality of metal mesh patterns and holes positioned between the metal mesh patterns; Forming an adhesive layer on the metal mesh layer; And positioning the adhesive layer on the base substrate and compressing the adhesive layer.

The metal mesh layer may include a first metal mesh layer and a second metal mesh layer, and the forming of the adhesive layer on the metal mesh layer may include forming a first adhesive layer on the first metal mesh layer. And forming a second adhesive layer on the second metal mesh layer, wherein the first adhesive layer is located on a first surface of the base substrate, and the second adhesive layer is a second layer of the base substrate. Provided is a method of manufacturing a current collector for a battery located on a surface.

In addition, the present invention after the step of providing the metal mesh layer, the step of pre-processing the metal mesh layer; And it provides a method for manufacturing a current collector for a battery further comprising a first washing step of washing the pre-treated metal mesh layer.

The present invention also provides a method for manufacturing a current collector for a battery, further comprising a second washing step of washing the metal mesh layer on which the adhesive layer is formed, after forming the adhesive layer on the metal mesh layer.

According to another aspect of the present invention, the step of providing the metal mesh layer includes: providing a pole master including a mesh having a shape corresponding to a shape of a metal mesh layer to be manufactured; At least any one of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co), and alloys thereof dissolved in an electrolytic solution is electrodeposited Electrodepositing the metal mesh by electrodeposition; An electrodeposited layer peeling step of peeling the metal mesh from the mesh; And it provides a method for manufacturing a current collector for a battery comprising an electrodeposition layer washing step of washing the peeled electrodeposition layer.

Further, in the present invention, the providing of the metal mesh layer is a step of providing a metal mesh layer including a protective film, and after placing the metal mesh layer on the adhesive layer and compressing the metal mesh layer from the metal mesh layer. It provides a method of manufacturing a current collector for a battery further comprising the step of removing the protective film.

In addition, the providing of the metal mesh layer including the protective film in the present invention, in the electrodeposition layer peeling step, by applying an adhesive to the protective film, after laminating it on top of the metal mesh formed on the mesh, The protective film and the metal mesh are peeled off at the same time, or the method for manufacturing a current collector for a battery, characterized in that attached to the protective film on the metal mesh washed through the electrodeposition layer washing step.

In addition, the present invention provides a method for manufacturing a current collector for a battery in which an active material is applied to the base substrate through the holes located between the metal mesh patterns.

As described above, according to the present invention, the active material is applied on the metal mesh layer through the holes of the metal mesh layer, thereby increasing the contact area of the metal mesh layer and the active material, thereby suppressing detachment of the active material from the current collector. Thus, the cycle life characteristics of the battery can be improved.

In addition, in the present invention, since the active material is also applied to the adhesive layer through holes located between the metal mesh patterns, the active material may be more firmly coated according to the adhesive property of the adhesive layer.

1 is an exploded cross-sectional view illustrating an electrode assembly of a typical lithium secondary battery.
2A is a cross-sectional view illustrating a current collector for a secondary battery according to a first embodiment of the present invention, and FIG. 2B is a cross-sectional view illustrating a current collector for a secondary battery according to a second embodiment of the present invention.
FIG. 3A is a schematic perspective view showing a mesh type cathode drum of the apparatus for manufacturing a metal mesh according to the present invention, FIG. 3B is a sectional view showing a part of the mesh cathode drum, FIG. 3C is a cross- FIG. 3D is a process flow chart showing a method of manufacturing a metal mesh according to the present invention. FIG.
4A to 4D are cross-sectional views illustrating a method of manufacturing a current collector for a secondary battery according to the present invention.
5A is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a first embodiment of the present invention, and FIG. 5B is a process illustrating a method of manufacturing a current collector for a secondary battery according to the first embodiment of the present invention. 5C is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a second embodiment of the present invention.
6A is a schematic configuration diagram for manufacturing a secondary battery current collector according to a modification of the first embodiment of the present invention, and FIG. 6B is a method of manufacturing a current collector for secondary batteries according to a modification of the first embodiment of the present invention. 6C is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a modification of the second embodiment of the present invention.
FIG. 7A is a view showing an example of a metal mesh layer according to the present invention, and FIG. 7B is a view showing another example of a metal mesh layer according to the present invention.
8A is a cross-sectional view showing a current collector for a secondary battery according to a third embodiment of the present invention, FIG. 8B is a cross-sectional view showing a current collector for a secondary battery according to a fourth embodiment of the present invention, and FIG. It is sectional drawing which shows the electrical power collector for secondary batteries which concerns on 5th Example.
9A is a photograph showing a cross section of a metal mesh pattern of a secondary battery current collector according to a third embodiment of the present invention, and FIG. 9B is a cross section of a metal mesh pattern of a current collector for secondary batteries according to a fourth embodiment of the present invention. 9C is a photograph showing a cross section of a metal mesh pattern of a current collector for a secondary battery according to a fifth embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. ≪ RTI ID = 0.0 >

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded cross-sectional view illustrating an electrode assembly of a typical lithium secondary battery.

Referring to FIG. 1, an electrode assembly 1 of a general lithium secondary battery includes a first electrode 10 (hereinafter referred to as an anode), a second electrode 20 (hereinafter referred to as a cathode), and separators 2a and 2b. ).

In this case, the electrode assembly 1 may have the positive electrode 10, the negative electrode 20, and the separators 2a and 2b stacked and wound to form a jelly roll.

Hereinafter, the configuration of the electrode assembly will be described in detail.

First, the separator may include a first separator 2b positioned between the anode 10 and the cathode 20 and a second separator 2a positioned below or above the two electrodes 10 and 20. The two electrodes stacked and wound are interposed in abutting part to prevent a short circuit between the two electrodes. In this case, the separator may be formed of a thermoplastic resin such as polyethylene (PE), polypropylene (PP), and the like, but the present invention is not limited to the material of the separator.

Next, the positive electrode 10 is a positive electrode current collector 11 that collects electrons generated by a chemical reaction and transfers them to an external circuit, and a slurry for the positive electrode including a positive electrode active material is coated on one or both surfaces of the positive electrode current collector 11. Consisting of positive electrode active material layers 12a and 12b.

In addition, the anode 10 may include an insulating member 13 formed to cover at least one of both ends of the cathode active material layers 12a and 12b.

In addition, one side or both sides of both ends of the positive electrode current collector 11 is not coated with a slurry for the positive electrode including the positive electrode active material, so that the positive electrode non-coating portion is formed, where the positive electrode current collector 11 is exposed, and the positive electrode non-coating portion is formed on the positive electrode non-coating portion. Electrodes collected in the whole 11 are transferred to an external circuit, and a positive electrode tab 14, which may be formed of a thin plate made of nickel or aluminum, is bonded.

In this case, a protective member 14a may be provided at an upper surface of the portion where the positive electrode tab 14 is bonded.

The positive electrode current collector 11 may be stainless steel, nickel, aluminum, titanium or alloys thereof, or a surface treated with carbon, nickel, titanium, or silver on the surface of aluminum or stainless steel, among which aluminum or aluminum An alloy is preferable and the material of the positive electrode current collector 11 is not limited in the present invention.

The cathode active material of the cathode active material layer includes a cathode active material capable of reversibly intercalating and deintercalating lithium ions. Representative examples of the cathode active material include LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , and LiMn ₂ O _4. Or lithium-transition metal oxides such as LiNi1-x-yCo xMyO ₂ (0 ≦ x ≦ 1, 0 ≦ y ≦ 1, 0 ≦ x + y ≦ 1, M is a metal such as Al, Sr, Mg, La, etc.) May be used, but the type of the cathode active material is not limited in the present invention.

Next, the negative electrode 20 includes a negative electrode current collector 21 for collecting electrons generated by a chemical reaction and delivering the electrons to an external circuit, and a negative electrode slurry including a negative electrode active material on one or both surfaces of the negative electrode current collector 21. It consists of the negative electrode active material layers 22a and 22b apply | coated.

In addition, the negative electrode 20 may include an insulating member 23 formed to cover at least one of both ends of the negative electrode active material layers 22a and 22b.

In addition, one side or both sides of both ends of the negative electrode current collector 21 is not coated with the negative electrode slurry containing the negative electrode active material, so that the negative electrode non-coating portion is formed to expose the negative electrode current collector 21 as it is, and the negative electrode non-coating portion has a negative electrode Electrodes collected in the current collector 21 are transferred to an external circuit, and a negative electrode tab 24, which may be formed of a thin plate made of nickel, is bonded.

A protective member 24a may be provided at an upper surface of a portion at which the negative electrode tab 24 is bonded.

As the negative electrode current collector 21, a surface treated with carbon, nickel, titanium, silver on the surface of stainless steel, nickel, copper, titanium or alloys thereof, copper or stainless steel, and the like, and among them, copper or copper An alloy is preferable and the material of the negative electrode current collector 23a is not limited in the present invention.

The negative electrode active material of the negative electrode active material layer may include a negative electrode active material capable of intercalating and deintercalating lithium ions, and the negative electrode active material may be a crystalline or amorphous carbon or a carbon-based negative electrode active material of a carbon composite. However, the present invention is not limited to the type of the negative electrode active material.

As described above, the negative electrode and the positive electrode are coated with respective active materials, that is, the negative electrode active material or the positive electrode active material, on each current collector, for example, the negative electrode current collector or the positive electrode current collector, to function as a secondary battery.

However, in such a secondary battery, the charging and discharging are repeated several tens to hundreds of times, and as the charging and discharging are repeated, the active material is detached from the current collector due to deterioration of the active material and the like, thereby degrading battery efficiency.

Hereinafter, the structure of the current collector for secondary batteries according to the present invention will be described. In this case, the secondary battery current collector according to the present invention may be a negative electrode current collector or a positive electrode current collector as described above, the secondary battery in the present invention is a concept including all kinds of secondary batteries capable of repeating the charging and discharging For example, it may be a secondary battery including the electrode assembly as shown in FIG. 1 described above.

2A is a cross-sectional view illustrating a current collector for a secondary battery according to a first embodiment of the present invention, and FIG. 2B is a cross-sectional view illustrating a current collector for a secondary battery according to a second embodiment of the present invention.

First, referring to FIG. 2A, the secondary battery current collector 100 according to the first embodiment of the present invention includes a base substrate 110.

The base substrate 110 may vary depending on whether the current collector is a positive electrode current collector or a negative electrode current collector.

For example, when the current collector is a positive electrode current collector, the base substrate 110 may include carbon, nickel, titanium, or silver on the surface of stainless steel, nickel, aluminum, titanium, or an alloy thereof, aluminum, or stainless steel. The thing etc. which were processed can be used, Among these, aluminum or an aluminum alloy is preferable.

In addition, when the current collector is a negative electrode current collector, the base substrate 110 is a surface treatment of carbon, nickel, titanium, silver on the surface of stainless steel, nickel, copper, titanium or their alloys, copper or stainless steel The thing etc. can be used and a copper or copper alloy is preferable among these.

Subsequently, referring to FIG. 2A, the secondary battery current collector 100 according to the first embodiment of the present invention may include the first metal mesh layer 130a and the base positioned on the first surface of the base substrate 110. The second metal mesh layer 130b is disposed on the second surface of the substrate 110.

The metal mesh layers 130a and 130b may be formed of at least one of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co), and alloys thereof. Although it may be made, the present invention is not limited to the material of the metal mesh layer.

However, in the present invention, it is preferable that the metal mesh layer also serves as a current collector inherent to a secondary battery. When the current collector is a positive electrode current collector, the metal mesh layer is preferably aluminum or an aluminum alloy. When the current collector is a negative electrode current collector, the metal mesh layer is preferably copper or a copper alloy.

At this time, the first metal mesh layer 130a includes a first hole 132a located between the first metal mesh patterns 131a, and the second metal mesh layer 130b includes a plurality of And a second hole 132b located between the two metal mesh patterns 131b.

Subsequently, referring to FIG. 2A, the secondary battery current collector 100 according to the first embodiment of the present invention is positioned between the first surface of the base substrate 110 and the first metal mesh layer 130a. The first adhesive layer 120a and the second adhesive layer 120b are disposed between the second surface of the base substrate 110 and the second metal mesh layer 130b.

More specifically, the first adhesive layer is located between the first surface of the base substrate 110 and the first metal mesh pattern 131a, and the second adhesive layer is located between the second surface of the base substrate 110 And is located between the second metal mesh patterns 131b.

The first adhesive layer 120a and the second adhesive layer 120b are for attaching the metal mesh layer on the base substrate 110. The first adhesive layer and the second adhesive layer may be solder layers, May be made of lead (Pb), tin (Sn), zinc (Zn), indium (In), cadmium (Cd), bismuth (Bi)

That is, the secondary battery current collector 100 according to the first embodiment of the present invention includes metal mesh layers 130a and 130b formed on the first and second surfaces of the base substrate 110, respectively. The mesh layer includes a plurality of metal mesh patterns 131a and 131b and holes 132a and 132b positioned between the metal mesh patterns 131a and 131b, respectively, wherein the base substrate and the metal mesh layer It includes an adhesive layer (120a, 120b) for attaching.

As described above, in a secondary battery having a general structure, as charging and discharging are repeated several tens to hundreds of times, due to deterioration of the active material, the active material is detached from the current collector, and battery efficiency is lowered.

However, in the present invention, a metal mesh layer is attached to the current collector to be coated with the active material, more specifically, the base substrate through an adhesive layer, and the metal mesh layer includes holes 132a and 132b positioned between the metal mesh patterns. Therefore, an active material is applied onto the metal mesh layer through the holes 132a and 132b, thereby increasing the contact area between the metal mesh layer and the active material, thereby suppressing detachment of the active material from the current collector, Cycle life characteristics can be improved.

In addition, in the present invention, the active material is applied on the metal mesh layer, in this case, the active material is also applied to the base substrate through a hole located between the metal mesh pattern.

That is, by including the region in which the active material is in direct contact with the base substrate, it is possible to prevent access of electrons and the like to be restricted by the adhesive layer in the charge and discharge process of the secondary battery.

Next, referring to FIG. 2B, the secondary battery current collector 200 according to the second embodiment of the present invention includes a base substrate 210 and a metal mesh layer 230 positioned on the base substrate 210. The metal mesh layer 230 includes a plurality of metal mesh patterns 231 and holes 232 positioned between the metal mesh patterns 231.

In addition, the secondary battery current collector 200 according to the second embodiment of the present invention includes an adhesive layer 220 positioned between the base substrate 210 and the metal mesh pattern 231.

As described above, in the secondary battery, for example, the positive electrode may apply the positive electrode active material to one side or both sides of the positive electrode current collector.

That is, the secondary battery current collector 200 according to the second embodiment of the present invention is an embodiment in which the metal mesh layer 230 is formed only on one surface of the base substrate 210. Therefore, in the present invention, the metal mesh layer is It can be formed in the 1st surface and / or 2nd surface of a base base material.

Since the current collector for the secondary battery according to the second embodiment may be the same as the current collector for the secondary battery according to the first embodiment except as described above, a detailed description thereof will be omitted.

Hereinafter, a method of manufacturing a current collector for a secondary battery according to the present invention will be described.

FIG. 3A is a schematic perspective view showing a mesh type cathode drum of the apparatus for manufacturing a metal mesh according to the present invention, FIG. 3B is a sectional view showing a part of the mesh cathode drum, FIG. 3C is a cross- FIG. 3D is a process flow chart showing a method of manufacturing a metal mesh according to the present invention. FIG.

3A and 3B, the mesh-type cathode drum 40 of the apparatus for manufacturing a metal mesh according to the present invention includes a rotating shaft 41b which is centered for rotation and a cylindrical shaft 41b which surrounds the rotating shaft 41b and has a constant width The branch includes a cylindrical drum 41a.

At this time, a chain connected to a motor that provides a rotational force to rotate the drum 41a may be coupled to one end of the rotation shaft 41b.

On the other hand, a mesh 42 having a shape to be manufactured is formed on the surface of the drum 40. At this time, the mesh 42 may be formed in a net shape having a plurality of hexagons connected to each other, and may be formed in a honeycomb shape, but the shape of the mesh may be a square, a triangle, a pentagon, But the shape of the mesh is not limited in the present invention.

The mesh 42 may be formed of a single metal or an alloy depending on the component of the electrolytic solution to be plated and may be integrally formed with the cylindrical drum 41a by directly processing the surface of the cylindrical drum 41a, Or by attaching to the surface of the cylindrical drum 41a a mesh 50 which is formed into a weaving type or a batch type which is formed by weaving a thread with a metal wire.

3A and 3B, an insulating layer 43 is disposed in a space between the mesh 42 and the mesh 42, and the insulating layer is made of a plastic such as an epoxy resin, a Teflon-based resin, Resin.

In this case, the insulating layer 43 may be formed in the space between the mesh and the mesh by forming a mesh 42 having a desired shape on the surface of the cylindrical drum 41a as described above, The insulating material may be applied by a vapor deposition method and planarized by a known chemical mechanical polishing (CMP) process.

Thereafter, a metal mesh layer (not shown) is formed on the mesh 42 on the surface of the mesh-type cathode drum through the mesh-type cathode drum 40 by the electroplating process, and the metal mesh layer (not shown) So that the metal mesh can be formed by the electrolytic process.

The mesh type negative electrode drum corresponds to a pole master. In the present invention, the pole master includes a mesh having a shape corresponding to the shape of the metal mesh layer to be fabricated so that the metal mesh layer can be formed by the electrolytic process. And may be of a drum type as shown in FIG. 3A, or may be of a flat plate type. Accordingly, in the present invention, the pole master for the electrolytic process may be a drum type or a flat type.

That is, the electric pole master according to the present invention includes a base plate and a mesh formed on the base plate and having a shape corresponding to the shape of the metal mesh layer to be manufactured. When the shape of the base plate is a drum shape, The pole master according to the present invention may be a drum type, and when the shape of the base plate is a flat type, the pole master according to the present invention may be a flat type.

Hereinafter, formation of the metal mesh layer through the mesh type negative electrode drum as described above will be described.

Referring to FIG. 3C, the continuous electric apparatus for manufacturing a metal mesh according to the present invention includes an electrolytic bath 34 for containing an electrolytic solution to be plated, and an electrolytic bath 34 for electrolytically supplying a part of electrolytic solution to the electrolytic bath 34 An anode basket (31) formed so as to be completely immersed in the electrolytic solution of the electrolytic bath (34) and formed in a shape corresponding to the mesh type cathode drum (40) ).

The electrolyte is formed of at least one of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co) and alloys thereof to form a metal mesh layer according to the present invention. It may be made of any one material, but does not limit the type of the electrolyte in the present invention.

3C, the electrolytic bath 34 has a semicylindrical shape which is drilled downward at the central lower surface. In the electrolytic bath 34, an electrolytic solution to be plated is formed on the surface of the mesh-type cathode drum 40 Lt; / RTI >

A structure in which the auxiliary tank 30 containing the electrolytic solution overflowing from the electrolytic bath 34 is formed in the lower part of the electrolytic bath 34 and the electrolytic solution is accommodated is constructed by a dual structure of the electrolytic bath 34 and the auxiliary tank 30 .

Therefore, about half of the rotating, mesh-like cathode drum 40 is immersed in the electrolytic bath 34, and the electrolytic solution injected from the electrolytic solution spraying channel 32, which will be described later, The electrolytic solution is stirred and the electrolytic solution overflowing the electrolytic bath 34 is received in the auxiliary tank 30 while the electrolytic solution is stirred by injecting the electrolytic solution in the electrolytic solution injection path 32.

The electrolytic bath 34 is provided with a mesh-type cathode drum 40 which is immersed in the electrolytic solution by about half of the electrolytic solution.

The mesh type negative electrode drum 40 is connected to a cathode of an applied power source and includes a rotating shaft 41b which is centered for rotation and a cylindrical drum 41a which surrounds the rotating shaft 41b and has a constant width .

Although not shown in the drawing, a power supply device for supplying a negative (-) voltage from the rectifier is provided at one end of the rotary shaft 41b, and a rotating force is applied to the other end of the cylindrical drum 41a to rotate the cylindrical drum 41a The motor can be coupled.

Accordingly, when power is applied to the motor to generate rotational power, the rotational power is transmitted to the rotating shaft 41b to rotate the cylindrical drum 41a.

3A, on the surface of the cylindrical drum 41a, a mesh 42 having a shape corresponding to a plurality of holes (132a and 132b in FIG. 2A) included in a metal mesh to be manufactured is formed In the embodiment of the present invention, the mesh 42 may be formed in a net shape in which a plurality of hexagons are connected to each other so as to have a honeycomb shape.

This will refer to the bar described with reference to FIG. 3A, and therefore, a detailed description of the mesh type cathode drum will be omitted.

A cathode basket 31 formed of an insoluble anode (+) or titanium (Ti) is provided under the mesh cathode drum 40.

The anode basket 31 is formed so as to have an arc shape in which the anode basket 31 is completely immersed in the electrolytic solution of the electrolytic cell 34 and is half-cut so as to correspond to the mesh-type cathode drum 40,

A metal cluster (33) having the same composition as the electrolytic solution of the electrolytic bath (34) can be accommodated inside the anode basket (31).

The metal clusters 33 are enclosed in a detachment prevention net that prevents the metal clusters 33 from being released into the electrolytic bath 34 from the inside of the anode basket 31.

The metal clusters 33 are melted in the electrolytic solution of the electrolytic bath 34 with the same mass of metal as the electrolytic solution of the electrolytic bath 34 to thereby adjust the amount and concentration of the electrolytic solution plated on the surface of the cylindrical drum 41a Can be performed.

Therefore, when a current is applied to the anode basket 31, positive ions dissolved from the metal clusters 33 move to the surface of the cylindrical drum 41a and are electrodeposited to be plated.

An electrolyte injection path 32 for injecting an electrolyte to stir the electrolytic solution of the electrolytic bath 34 may be formed at the lower end of the electrolytic bath 34 and more specifically at the center of the lower end of the anode basket 31, The injection path 32 may be formed of a cylindrical plastic pipe having a long inside and communicating with the inside of the electrolytic bath 34.

Therefore, when the electrolytic solution is injected into the electrolytic bath 34 through the electrolytic solution injecting channel 32, the electrolytic solution in the electrolytic bath 34 is agitated and the hydrogen generated from the mesh type negative electrode drum 40 H ₂ ) gas can be smoothly removed.

Although not shown in the drawing, the continuous electrophotographic apparatus may further include a circulation-filtering means. The circulation-filtering means circulates the electrolytic solution in the auxiliary tank 30 to the electrolytic bath 34, However, since this is a general configuration, a detailed description will be omitted below.

3C, a guide roller 51 for peeling the metal mesh 50 to be plated on the outer circumferential surface of the cylindrical drum 41a is provided at the upper right portion of the mesh type cathode drum 40 And a washing tub 60 for washing the surface of the metal mesh 50 may be provided.

A winding roller 70 may be provided on the right side of the washing tub 60 and the winding roller 70 may continuously wind the washed metal mesh 50 while passing through the washing tub 60.

Hereinafter, a method of manufacturing the metal mesh using the continuous electric pole apparatus will be described with reference to FIG. 3D.

First, the electrolytic solution in the electrolytic bath 34 is energized by an applied power source to cause electrolysis to occur, and the electrolytic solution is injected into the electrolytic bath 34 by the electrolytic solution injection channel 32, The electrolytic solution stirring step (S10) is carried out. However, in the present invention, the electrolytic solution stirring step is optional and may be omitted in some cases.

After the electrolytic solution stirring step S10 is performed, a drum rotating step S20 is performed to rotate the mesh-type cathode drum 40 installed in the electrolytic bath 34. At this time, in the case of the drum rotation step, it corresponds to a case where the pole master is a drum type, and may be omitted when the pole master is a flat plate type.

Since at least one material of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co) and their alloys dissolved in the electrolyte, for example, copper Electrodepositing (Cu) on the upper surface of the mesh to perform the electrodeposition step (S30) to form a metal mesh layer.

The current density in the electrodeposition step S30 may be 0.1 to 30 mA / cm < 2 >. However, the present invention does not limit the current density range. Depending on the substance to be electrodeposited, .

 For example, a range of 0.1 to 1 mA / cm < 2 > may be in a range where the electrodeposition of copper (Cu) is actively generated, and a range of 3 to 15 mA / May be a range in which electrodeposition is actively generated.

It is also preferable to perform the electrodeposition of the metal mesh layer within a certain temperature range of the electrolyte solution so that the electrodeposition of the metal mesh layer can be more actively deposited in the current density range.

For example, the copper (Cu) or nickel (Ni) may actively perform electrodeposition when the temperature of the electrolytic solution is 10 to 50 ° C. However, the temperature of the electrolytic solution is not limited in the present invention.

After the electrodepositing step S30 is completed according to the above conditions, a metal mesh layer is formed on the outer surface of the mesh-type cathode drum 40, more specifically, on the mesh (42 of FIG. 3B).

After the electrodepositing step S30, an electrodeposited layer peeling step (S40) for peeling the metal mesh layer from the outer surface of the mesh-type cathode drum 40, specifically, the mesh, is continued.

The electrodeposited layer peeling step (S40) advances while the metal mesh layer attached to the outer surface of the mesh type cathode drum (40) is guided to the upper right by the rotation of the guide roller (51).

More specifically, an adhesive is applied to a protective film (not shown) such as PET, PC, PMMA and the like, laminated on the metal mesh layer formed on the mesh of the mesh type negative electrode drum, And the metal mesh layer are peeled at the same time, and the metal mesh 50 can be formed by the electrolytic process.

After the electrodeposition layer peeling step S40, three steps of electrodeposition layer S50 are performed in which the metal mesh 50 separated from the mesh cathode drum 40 is dipped in the washing tank 60 and washed with water, The metal mesh 50 washed three times by the number of electrodeposited layers (S50) is wound on the take-up roller 70, and the metal mesh winding step S60 is performed.

When all the above steps are completed, the metal mesh 50 can be stored in the wound state on the take-up roller 70, and it can be applied to various fields by cutting the metal mesh 50 according to the required length and shape.

On the other hand, in the step of peeling the electrodeposition layer, an adhesive is applied to a protective film (not shown) and laminated on the metal mesh layer formed on the mesh of the mesh type negative electrode drum, It is also possible to separate only the metal mesh layer from the mesh of the mesh type negative electrode drum without a separate protective film. However, it is also possible to separate the metal mesh layer from the mesh of the mesh type negative electrode drum In this case, since the thickness of the metal mesh layer is thin, it is difficult to handle in the process. Therefore, the metal mesh 50 washed by the three electrodeposition step (S50) may be attached to a separate protective film.

As described above, in the present invention, the metal mesh layer may be formed through the continuous electric pole apparatus for manufacturing the metal mesh, and the metal mesh layer formed may be used as the metal mesh layer of the current collector as described above.

4A to 4D are cross-sectional views illustrating a method of manufacturing a current collector for a secondary battery according to the present invention. Hereinafter, a method of manufacturing a current collector for a secondary battery according to the present invention will be described based on the method of manufacturing a current collector for a secondary battery according to the first embodiment of the present invention of FIG. 2A.

First, referring to FIG. 4A, the metal mesh layer 130 is manufactured through the metal mesh manufacturing apparatus as described above.

Meanwhile, in the above description, the metal mesh layer is manufactured by the electroforming method through the continuous electrodeposition device. Alternatively, the metal mesh layer may be manufactured by weaving or machining, But not limited to,

In this case, the width d1 of the metal mesh layer 130 may be 1 to 500 μm, the thickness d2 of the metal mesh layer may be 1 to 500 μm, and the distance between the metal mesh pattern 130 and the metal mesh pattern That is, the size of the hole 132 located between the metal mesh patterns 131 may be 1 μm to 3 mm, but these numerical values are not limited in the present invention.

Referring to FIG. 4A, an adhesive layer 120 is formed on one surface of the metal mesh layer 130.

The adhesive layer 120 may be a solder layer, and the solder layer may be formed by a known electrolytic plating method or electroless plating method. However, the method of forming the solder layer in the present invention is not limited thereto.

At this time, the thickness d3 of the adhesive layer may be 1 to 20 占 퐉, but the numerical values are not limited thereto.

Next, referring to FIG. 4B, a base substrate 110 is prepared.

The base substrate is intended to function as a current collector of a secondary battery. As described above, when the current collector is a positive electrode current collector, the base substrate 110 is made of stainless steel, nickel, aluminum, titanium, or an alloy thereof. , Surface treated with carbon, nickel, titanium, silver, etc. on the surface of aluminum or stainless steel, and when the current collector is a negative electrode current collector, the base substrate 110 is made of stainless steel, nickel, What surface-treated carbon, nickel, titanium, silver on the surface of copper, titanium, or their alloys, copper, or stainless steel, etc. can be used.

At this time, the thickness d4 of the base substrate 110 may be 1 to 100 탆, but the numerical values are not limited thereto.

Next, referring to FIG. 4C, a metal mesh layer having an adhesive layer formed on one surface thereof is placed on the base substrate, and then the metal mesh layer is pressed on the base substrate through a pressing roller.

More specifically, a first metal mesh layer 130a having a first adhesive layer 120a formed on one surface thereof is placed on the first surface of the base substrate, and a second metal mesh layer 130b having a second adhesive layer 120b formed on one surface thereof 130b are positioned on the second surface of the base substrate and then the metal mesh layer is pressed through a pressing roller to form a first metal mesh layer on the first surface of the base substrate, A second metal mesh layer may be formed on two sides.

At this time, in order to improve adhesion characteristics between the adhesive layer and the base material, it is preferable to apply a certain temperature to the first metal mesh layer and the second metal mesh layer, have.

As a result, a battery current collector including the metal mesh layer according to the present invention can be manufactured,

That is, as shown in Figure 4d, the secondary battery current collector 100 according to the first embodiment of the present invention is a metal mesh layer 130a, respectively formed on the first and second surfaces of the base substrate 110, 130b), wherein the metal mesh layer includes a plurality of metal mesh patterns 131a and 131b and holes 132a and 132b positioned between the metal mesh patterns, respectively, wherein the base substrate and the metal mesh Adhesive layers 120a and 120b for attaching the layers are included.

Hereinafter, a method of manufacturing the current collector for secondary batteries according to the present invention will be described in more detail.

5A is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a first embodiment of the present invention, and FIG. 5B is a process illustrating a method of manufacturing a current collector for a secondary battery according to the first embodiment of the present invention. 5C is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a second embodiment of the present invention. However, the method of manufacturing the current collector for a secondary battery according to the second embodiment of the present invention may be the same as the method of manufacturing the first embodiment described above, except as will be described later. Reference is made.

First, referring to FIGS. 5A and 5B, in the method of manufacturing the current collector for a secondary battery according to the first embodiment of the present invention, the metal mesh layer 1021 is manufactured through the metal mesh manufacturing apparatus as described above. A metal mesh layer is provided (S100).

At this time, as described above, the metal mesh layer may include holes between the metal mesh pattern and the metal mesh pattern, which are as described above, and thus a detailed description thereof will be omitted.

On the other hand, as shown in Figure 5a, in the secondary battery current collector according to the first embodiment of the present invention, in order to supply the metal mesh layer to the first surface and the second surface of the base substrate, the supply portion of the metal mesh layer 1020a and 1020b may be located on the first and second surfaces of the base substrate, respectively.

That is, a metal mesh layer first supply portion 1020a for providing a first metal mesh layer on the first surface of the base substrate and a metal mesh layer second supply portion 1020b for providing a second metal mesh layer on the second surface of the base substrate, Gt; 1020b. ≪ / RTI >

Since the processes of the first metal mesh layer and the second metal mesh layer are the same, the first metal mesh layer and the second metal mesh layer are not distinguished from each other and are referred to as a metal mesh layer do.

Next, the metal mesh layer is pretreated (S110).

The pretreatment may be a general chemical pretreatment. The chemical pretreatment may be performed by immersing the object material, that is, the metal mesh layer, into an acidic or alkaline solution, such as pickling and degreasing, , Contaminants, impurities, and the like.

In the present invention, the pretreatment may be a chemical pretreatment method by immersing the metal mesh layer in the pretreatment water tanks 1021a and 1021b containing the pretreatment solution. However, the method of pretreatment in the present invention is not limited thereto, , The pre-processing step may be omitted.

Next, the pretreated metal mesh layer is subjected to a first water washing step (S120).

The first water washing step is a step for removing the pretreatment solution used in the pretreatment step and may be performed by immersing the metal mesh layer in the first water storage tank 1022a or 1022b containing the water wash solution. However, the method of washing in the present invention is not limited, and if necessary, the first washing step may be omitted.

Next, an adhesive layer is formed on the metal mesh layer (S130).

The adhesive layer may be a solder layer, and the solder layer may be formed by a known electrolytic plating method or electroless plating method by immersing the metal mesh layer in a plating water tank 1023a, 1023b containing a plating liquid However, the method of forming the solder layer in the present invention is not limited thereto.

At this time, a first adhesive layer may be formed on the first metal mesh layer, and a second adhesive layer may be formed on the second metal mesh layer.

On the other hand, at the time of forming the adhesive layer by the method of immersing the metal mesh layer in the plating water tanks 1023a and 1023b of the step S130 shown in FIG. 5A, both surfaces of the first metal mesh layer, that is, And an adhesive layer may be formed on both surfaces of the second metal mesh layer, that is, on the first and second surfaces.

Of course, in the present invention, the adhesive layer may be formed on both sides of the metal mesh layer. However, in the present invention, it is sufficient that the adhesive layer is formed only on at least one side. .

On the other hand, it is obvious that the adhesive layer can be selectively formed only on one side by known printing method, vapor deposition method or the like.

Next, a second water washing step of washing the metal mesh layer 1022 with the adhesive layer is performed (S140).

The second water rinsing step is a step of washing the plating solution or the like used in the adhesive layer forming step and may be performed by immersing the metal mesh layer in the second water storage tank 1024a or 1024b containing the rinsing solution , But the method of washing in the present invention is not limited, and if necessary, the second washing step may be omitted.

Next, the metal mesh layer on which the adhesive layer is formed is dried (S150).

The drying step may be hot air drying in the hot air drying furnaces 1025a and 1025b, but the drying method is not limited in the present invention, and the drying step may be omitted if necessary.

5A and 5B, a base substrate 1011 prepared from the base substrate supplying unit 1010 is provided (S160).

The base substrate 1011 may vary depending on whether the current collector is a positive electrode current collector or a negative electrode current collector. As described above, the detailed description thereof will be omitted.

On the other hand, as described above, in the current collector for secondary batteries according to the first embodiment of the present invention, in order to supply the metal mesh layer to the first surface and the second surface of the base substrate, the supply portion 1020a, 1020b) may be located on the first side and the second side of the base substrate, respectively.

That is, a metal mesh layer first supply portion 1020a for providing a first metal mesh layer on the first surface of the base substrate and a metal mesh layer second supply portion 1020b for providing a second metal mesh layer on the second surface of the base substrate, (1020b) through which a first metal mesh layer comprising a first adhesive layer is provided on a first side of a base substrate and a second metal mesh layer comprising a second adhesive layer on a second side of the base substrate, Can be provided.

Next, the metal mesh layer 1022 including the adhesive layer is placed on the base substrate, and the metal mesh layer 1022 is pressed by the pressing rollers 1130a and 1130b (S170).

In a current collector for a secondary battery according to a first embodiment of the present invention, a first metal mesh layer including a first adhesive layer is disposed on a first surface of a base substrate, and a second adhesive layer is included on a second surface of the base substrate. After positioning the second metal mesh layer, the first metal mesh layer and the second metal mesh layer are formed on the first surface and the second surface of the base substrate through the pressing roller, respectively, through the first adhesive layer and the second adhesive layer, respectively. Each can be compressed to.

At this time, in order to improve adhesion characteristics between the adhesive layer and the metal mesh layer, it is preferable to apply a certain temperature to the first metal mesh layer and the second metal mesh layer, .

As a result, a current collector for a battery including the metal mesh layer according to the first embodiment of the present invention can be manufactured.

That is, as shown in Figure 4d, the secondary battery current collector 1031 according to the first embodiment of the present invention includes a metal mesh layer formed on the first and second surfaces of the base substrate, respectively, Each of the mesh layers includes a plurality of metal mesh patterns and holes located between the metal mesh patterns, and the mesh layer includes an adhesive layer for attaching the base substrate and the metal mesh layer.

Next, referring to FIG. 5C, in the method of manufacturing the current collector for a secondary battery according to the second embodiment of the present invention, as described above, the metal mesh layer 2021 is manufactured through the metal mesh manufacturing apparatus, and the metal mesh is manufactured. Provide a layer.

At this time, as described above, the metal mesh layer may include holes between the metal mesh pattern and the metal mesh pattern, which are as described above, and thus a detailed description thereof will be omitted.

On the other hand, as shown in Figure 5c, in the current collector for a secondary battery according to a second embodiment of the present invention the metal mesh layer of any one of the first surface and the second surface of the base substrate, for example, In order to supply to the first surface, the supply portion 2020a of the metal mesh layer may be located only on the first surface of the base substrate.

That is, it includes a metal mesh layer supply portion 1020a for providing a metal mesh layer on the first surface of the base substrate.

As described above, in the secondary battery, for example, the positive electrode may apply the positive electrode active material to one side or both sides of the positive electrode current collector.

That is, the method of manufacturing the secondary battery current collector according to the second embodiment of the present invention is an embodiment in which the metal mesh layer is formed only on one surface of the base substrate. And / or on the second surface.

Next, the metal mesh layer is pretreated.

The pretreatment may be a chemical pretreatment method by immersing the metal mesh layer in a pretreatment water tank 2021a containing a pretreatment solution.

Next, a first washing step of washing the pretreated metal mesh layer is performed.

The first water rinsing step may be performed by immersing the metal mesh layer in the first water storage tank 2022a in which the water wash solution is stored.

Next, an adhesive layer is formed on the metal mesh layer.

The adhesive layer may be a solder layer, and the solder layer may be formed by a known electrolytic plating method or electroless plating method by dipping the metal mesh layer in a plating water tank 2023a containing a plating liquid.

Next, the metal mesh layer 2022 on which the adhesive layer is formed is subjected to a second water washing step.

The second water rinsing step may be performed by immersing the metal mesh layer in a second water storage tank 2024a containing a water wash solution.

Next, the metal mesh layer on which the adhesive layer is formed is dried.

The drying step may be hot air drying in the hot air drying furnace 2025a.

5C, a base material 2011 prepared from the base material supplying portion 2010 is provided.

The base substrate 2011 may vary depending on whether the current collector is a positive electrode current collector or a negative electrode current collector. As described above, the detailed description thereof will be omitted.

On the other hand, as described above, in the current collector for secondary batteries according to the second embodiment of the present invention, in order to supply the metal mesh layer to the first surface of the base substrate, the supply portion 2020a of the metal mesh layer of the base substrate It may be located only on the first side.

Next, the metal mesh layer 2022 including the adhesive layer is placed on the base substrate, and the metal mesh layer 2022 is pressed by the pressing rollers 2130a and 2130b.

In the current collector for secondary batteries according to the second embodiment of the present invention, the metal mesh layer including the adhesive layer is positioned on the first surface of the base substrate, and then the metal mesh layer is attached to the base substrate through a pressing roller. It can be pressed on the first surface of the.

At this time, in order to improve adhesion characteristics between the adhesive layer and the metal mesh layer in the pressing of the metal mesh layer, it is preferable to apply a constant temperature, and the predetermined temperature may be 150 to 500 ° C.

As a result, a battery current collector including the metal mesh layer according to the second embodiment of the present invention can be manufactured.

That is, as shown in Figure 2b, the secondary battery current collector 2031 according to the second embodiment of the present invention includes a metal mesh layer formed on the first surface of the base substrate, the metal mesh layer is a plurality of metal A hole is positioned between the mesh pattern and the metal mesh pattern. In this case, an adhesive layer for attaching the base substrate and the metal mesh layer is included.

6A is a schematic configuration diagram for manufacturing a secondary battery current collector according to a modification of the first embodiment of the present invention, and FIG. 6B is a method of manufacturing a current collector for secondary batteries according to a modification of the first embodiment of the present invention. 6C is a schematic configuration diagram for manufacturing a current collector for a secondary battery according to a modification of the second embodiment of the present invention. However, the method of manufacturing the current collector for secondary batteries according to the modification of the first embodiment of the present invention may be the same as the method of manufacturing the first embodiment described above. In addition, a method of manufacturing a current collector for a secondary battery according to a modification of the second embodiment of the present invention may be the same as the method of manufacturing the modification of the first embodiment described above, except as will be described later. Reference will be made to FIG. 6B.

First, referring to FIGS. 6A and 6B, a method of manufacturing a current collector for a secondary battery according to a modification of the first embodiment of the present invention may include a metal mesh layer including a protective film through the metal mesh manufacturing apparatus as described above. 1112 to provide a metal mesh layer including a protective film (S200).

As described above, in the step of peeling the electrodeposited layer for producing the metal mesh layer, an adhesive is applied to the protective film, laminated on the metal mesh layer formed on the mesh of the surface of the mesh type negative electrode drum, The film and the metal mesh layer can be simultaneously peeled off.

Alternatively, it is also possible to separate only the metal mesh layer from the mesh of the mesh cathode drum without a separate protective film. In this case, in order to facilitate handling in the process, the metal mesh, It may be used by being attached to a protective film.

The method of manufacturing a current collector for a secondary battery according to a modification of the first embodiment of the present invention corresponds to using the metal mesh layer including the protective film.

6A and 6B, the metal mesh layer may include a hole between the metal mesh pattern and the metal mesh pattern, which is as described above, and thus a detailed description thereof will be omitted.

On the other hand, as shown in Figure 6a, in the current collector for secondary batteries according to a modification of the first embodiment of the present invention, in order to supply the metal mesh layer to the first surface and the second surface of the base substrate, a metal mesh layer The supply units 1120a and 1120b may be positioned on the first and second surfaces of the base substrate, respectively.

That is, a metal mesh layer first supply portion 1120a for providing a first metal mesh layer on the first surface of the base substrate and a metal mesh layer second supply portion 1120b for providing a second metal mesh layer on the second surface of the base substrate, Gt; 1120b. ≪ / RTI >

Since the processes of the first metal mesh layer and the second metal mesh layer are the same, the first metal mesh layer and the second metal mesh layer are not distinguished from each other and are referred to as a metal mesh layer do.

Next, the metal mesh layer is pretreated (S210).

The pretreatment may be a chemical pretreatment method by immersing the metal mesh layer in a pretreatment water tank 1121a or 1121b containing a pretreatment solution.

Next, a first washing step of washing the pretreated metal mesh layer is performed (S220).

The first water rinsing step may be performed by immersing the metal mesh layer in the first water storage tank 1122a or 1122b containing the water wash solution.

Next, an adhesive layer is formed on the metal mesh layer (S230).

The adhesive layer may be a solder layer, and the solder layer may be formed by an electrolytic plating method or an electroless plating method known by a method of immersing the metal mesh layer in a plating water tank 1123a or 1123b containing a plating liquid .

At this time, a first adhesive layer may be formed on the first metal mesh layer, and a second adhesive layer may be formed on the second metal mesh layer.

Next, the metal mesh layer 1122 on which the adhesive layer is formed is subjected to a second water washing step (S240).

And the second water rinsing step may be performed by immersing the metal mesh layer in the second water storage tank 1124a or 1124b containing the water wash solution.

Next, the metal mesh layer on which the adhesive layer is formed is dried (S250).

The drying step may be hot air drying in the hot air drying furnaces 1125a and 1125b.

6A and 6B, a base substrate 1111 prepared from the base substrate supplying unit 1110 is provided (S260).

The base substrate 1111 may vary depending on whether the current collector is a positive electrode current collector or a negative electrode current collector. As described above, the detailed description thereof will be omitted.

On the other hand, as described above, in the current collector for secondary batteries according to a modification of the first embodiment of the present invention, in order to supply the metal mesh layer to the first surface and the second surface of the base substrate, the supply portion of the metal mesh layer ( 1120a and 1120b may be located on the first and second surfaces of the base substrate, respectively.

That is, it is possible to provide a first metal mesh layer comprising a first adhesive layer on a first side of a base substrate, and a second metal mesh layer on a second side of the base substrate comprising a second adhesive layer.

Next, the metal mesh layer 1122 including the adhesive layer is placed on the base substrate, and the metal mesh layer 1122 is pressed by the pressing rollers 1130a and 1130b (S270).

In positioning the metal mesh layer including the adhesive layer on the base substrate, an adhesive layer positioned on the opposite surface on which the protective film is placed is placed on the base substrate.

In a current collector for secondary batteries according to a modification of the first embodiment of the present invention, a first metal mesh layer including a first adhesive layer is positioned on a first surface of a base substrate, and a second adhesive layer is included on a second surface of the base substrate. After positioning the second metal mesh layer, the first metal mesh layer and the second metal mesh layer through the pressing roller, respectively through the first adhesive layer and the second adhesive layer, the first surface and the second surface of the base substrate Each surface can be pressed.

At this time, in order to improve adhesion characteristics between the adhesive layer and the metal mesh layer, it is preferable to apply a certain temperature to the first metal mesh layer and the second metal mesh layer, .

On the other hand, the current collector 1113 for the secondary battery, which proceeds to step S270, since the metal mesh layer includes the protective film, the protective film is included on the opposite surface of the metal mesh layer not adhered to the base substrate.

Therefore, in the method of manufacturing a secondary battery current collector according to a modification of the first embodiment of the present invention, the protective film is removed from the metal mesh layer at the end of use (S280).

On the other hand, compared with the first embodiment, the modified example of the first embodiment is because the protective film is included on the upper portion of the metal mesh layer, more specifically, the upper surface of the opposite side of the metal mesh layer not adhered to the base substrate The protection characteristics and storage characteristics of the current collector for secondary batteries may be easy.

As a result, a battery current collector including a metal mesh layer according to a modification of the first embodiment of the present invention can be manufactured.

Next, referring to FIG. 6C, a method of manufacturing a current collector for a secondary battery according to a modification of the second exemplary embodiment of the present invention may include a metal mesh layer 2121 including a protective film, and a metal including a protective film. Provide a mesh layer.

At this time, as described above, the metal mesh layer may include holes between the metal mesh pattern and the metal mesh pattern, which are as described above, and thus a detailed description thereof will be omitted.

On the other hand, as shown in Figure 6c, in the current collector for a secondary battery according to a modification of the second embodiment of the present invention the metal mesh layer is one of the first surface and the second surface of the base substrate, for example For example, in order to supply to the first surface, the supply portion 2120a of the metal mesh layer may be located only on the first surface of the base substrate.

That is, it includes a metal mesh layer supply part 2120a for providing a metal mesh layer on the first surface of the base substrate.

As described above, in the secondary battery, for example, the positive electrode may apply the positive electrode active material to one side or both sides of the positive electrode current collector.

That is, the method of manufacturing the secondary battery current collector according to the modification of the second embodiment of the present invention is an embodiment in which a metal mesh layer is formed only on one surface of the base substrate. It may be formed on one side and / or the second side.

Next, the metal mesh layer is pretreated.

The pretreatment may be a chemical pretreatment method by immersing the metal mesh layer in a pretreatment water tank 2121a containing a pretreatment solution.

Next, a first washing step of washing the pretreated metal mesh layer is performed.

The first water rinsing step may be performed by immersing the metal mesh layer in a first water storage tank 2122a containing a water-washing solution.

Next, an adhesive layer is formed on the metal mesh layer.

The adhesive layer may be a solder layer, and the solder layer may be formed by a known electrolytic plating method or electroless plating method by dipping the metal mesh layer in a plating water tank 2123a containing a plating liquid.

Next, the metal mesh layer 2122 on which the adhesive layer is formed is washed with water.

The second water rinsing step may be performed by immersing the metal mesh layer in a second water storage tank 2124a containing a water-washing solution.

Next, the metal mesh layer on which the adhesive layer is formed is dried.

The drying step may be hot air drying conducted in the hot air drying furnace 2125a.

Subsequently, referring to FIG. 6C, a base substrate 2111 prepared from the base substrate supplying portion 2110 is provided.

The base substrate 2111 may vary depending on whether the current collector is a positive electrode current collector or a negative electrode current collector. As described above, the detailed description thereof will be omitted.

On the other hand, as described above, in the current collector for secondary batteries according to a modification of the second embodiment of the present invention, in order to supply the metal mesh layer to the first surface of the base substrate, the supply portion 2120a of the metal mesh layer is a base It may be located only on the first side of the substrate.

Next, the metal mesh layer 2122 including the adhesive layer is placed on the base substrate, and the metal mesh layer 2122 is pressed by the pressing rollers 2130a and 2130b.

In the current collector for secondary batteries according to a modification of the second embodiment of the present invention, the metal mesh layer including the adhesive layer is positioned on the first surface of the base substrate, and then the metal mesh layer is attached to the metal mesh layer through the adhesive layer. It can be pressed onto the first surface of the base substrate.

At this time, in order to improve adhesion characteristics between the adhesive layer and the metal mesh layer in the pressing of the metal mesh layer, it is preferable to apply a constant temperature, and the predetermined temperature may be 150 to 500 ° C.

On the other hand, as described above, since the metal mesh layer includes a protective film in the current collector 2131 for the secondary battery, the protective film is included on the opposite side of the base mesh and the non-bonded metal mesh layer. have.

Therefore, in the method of manufacturing the current collector for secondary batteries according to the modification of the second embodiment of the present invention, the protective film is removed from the metal mesh layer at the end of use.

On the other hand, compared with the second embodiment, the modification of the second embodiment is because the protective film is included on the upper portion of the metal mesh layer, more specifically, the upper surface of the opposite side of the metal mesh layer not adhered to the base substrate The protection characteristics and storage characteristics of the current collector for secondary batteries may be easy.

As a result, a battery current collector including a metal mesh layer according to a modification of the second embodiment of the present invention can be manufactured.

FIG. 7A is a view showing an example of a metal mesh layer according to the present invention, and FIG. 7B is a view showing another example of a metal mesh layer according to the present invention.

As shown in FIG. 7A, the planar shape of the metal mesh layer according to the present invention may be a substantially rectangular shape. As shown in FIG. 7B, the planar shape of the metal mesh layer according to the present invention may be substantially hexagonal.

As described above, in the case where the metal mesh layer according to the present invention is manufactured through the continuous electric pole apparatus for manufacturing a metal mesh, the continuous electric pole apparatus includes a cylindrical drum, and depending on the shape of the mesh formed on the surface of the cylindrical drum, The shape of the metal mesh layer can be determined.

That is, the mesh of the shape to be manufactured is formed on the surface of the cylindrical drum of the continuous electric pole apparatus, and the mesh may be formed in a net shape in which a plurality of hexagons are connected to each other, When the shape of the mesh is a hexagon, the planar shape of the metal mesh layer is also a hexagon, and when the shape of the mesh is a quadrangle, the shape of the metal mesh layer may be a square, a triangle, The planar shape of the projection lens may be a rectangle. However, the shape of the metal mesh layer is not limited in the present invention.

8A is a cross-sectional view showing a current collector for a secondary battery according to a third embodiment of the present invention, FIG. 8B is a cross-sectional view showing a current collector for a secondary battery according to a fourth embodiment of the present invention, and FIG. It is sectional drawing which shows the electrical power collector for secondary batteries which concerns on 5th Example.

In this case, the current collectors for secondary batteries according to the third to fifth embodiments may be the same as the current collectors for secondary batteries according to the first embodiment, except as described below.

First, referring to FIG. 8A, the secondary battery current collector 300 according to the third exemplary embodiment of the present invention may include metal mesh layers 330a and 330b formed on the first and second surfaces of the base substrate 110, respectively. The metal mesh layer may include a plurality of metal mesh patterns 331a and 331b and holes 332a and 332b positioned between the metal mesh patterns, respectively, wherein the base substrate and the metal mesh layer may be formed. The adhesive layers 120a and 120b for attaching are included.

In this case, the shape of the metal mesh pattern of the secondary battery current collector according to the third embodiment of the present invention may be different from that of the first embodiment.

More specifically, the first metal mesh pattern 331a of the first metal mesh layer 330a includes the lower end portion 331a ₂ and the upper end portion 331a ₁ , and the second metal mesh layer 330b includes the second metal mesh pattern 331a, pattern that (331b) is larger than the width of the lower end (331b _2), and an upper end comprising a (331b _1), wherein, each of the upper end of (331a _1, 331b ₁₎ the lower end is the width of each (331a _2, 331b ₂₎ .

That is, in the present invention, the width of the upper end portions 331a ₁ and 331b ₁ is greater than the width of the lower end portions 331a ₂ and 331b ₂ , thereby desorbing the active material applied onto the metal mesh layer through the holes 332a and 332b. It can prevent more efficiently.

In the present invention, the reference of the upper and lower ends is based on the surface of the base substrate to which the respective metal mesh layers are bonded, that is, the first metal mesh pattern is formed with the upper and lower ends And the second metal mesh pattern can be divided into an upper portion and a lower portion based on the second surface of the base substrate.

Next, referring to FIG. 8B, the secondary battery current collector 400 according to the fourth exemplary embodiment of the present invention may include metal mesh layers 430a and 430b formed on the first and second surfaces of the base substrate 110, respectively. The metal mesh layer includes a plurality of metal mesh patterns 431a and 431b and holes 432a and 432b positioned between the metal mesh patterns, respectively, wherein the base substrate and the metal mesh layer It includes an adhesive layer (120a, 120b) for attaching.

In this case, the shape of the metal mesh pattern of the secondary battery current collector according to the fourth embodiment of the present invention may be different from that of the first embodiment.

More specifically, the first metal mesh pattern 431a of the first metal mesh layer 430a includes a lower end portion 431a ₂ and an upper end portion 431a ₁ , and the second metal mesh layer 430b ' pattern that (431b) is larger than the width of the lower end (431b _2), and an upper end comprising a (431b _1), wherein, each of the upper end of (431a _1, 431b ₁₎ the lower end is the width of each (431a _2, 431b ₂₎ .

That is, in the present invention, the width of the upper end portions 431a ₁ and 431b ₁ is greater than the width of the lower end portions 431a ₂ and 431b ₂ , thereby desorbing the active material applied onto the metal mesh layer through the holes 432a and 432b. It can prevent more efficiently.

At this time, as shown in Figure 8b, the current collector for secondary batteries according to the fourth embodiment of the present invention may have a form that increases in width from the lower end of the metal mesh pattern to the upper end, thereby, on the metal mesh layer The capacity of the secondary battery can be increased by ensuring the space where the active material can be applied to the maximum while preventing the detachment of the applied active material more efficiently.

In the present invention, the reference of the upper and lower ends is based on the surface of the base substrate to which the respective metal mesh layers are bonded, that is, the first metal mesh pattern is formed with the upper and lower ends And the second metal mesh pattern can be divided into an upper portion and a lower portion based on the second surface of the base substrate.

Next, referring to FIG. 8C, the secondary battery current collector 500 according to the fifth exemplary embodiment of the present invention may include metal mesh layers 530a and 530b formed on the first and second surfaces of the base substrate 110, respectively. Wherein the metal mesh layer includes a plurality of metal mesh patterns 531a and 531b and holes 532a and 532b positioned between the metal mesh patterns, respectively, wherein the base substrate and the metal mesh layer It includes an adhesive layer (120a, 120b) for attaching.

In this case, the shape of the metal mesh pattern of the secondary battery current collector according to the fifth embodiment of the present invention may be different from that of the first embodiment.

More specifically, the first metal mesh pattern 531a of the first metal mesh layer 530a includes the lower end portion 531a ₂ and the upper end portion 531a ₁ , and the second metal mesh layer 530b includes the second metal mesh pattern 531a, pattern (531b) is smaller than the width of the lower end (531b _2), and an upper end comprising a (531b _1), wherein, each of the upper end of (531a _1, 531b ₁₎ the lower end is the width of each (531a _2, 531b ₂₎ .

That is, in the present invention, the width of the upper end portions 531a ₁ and 531b ₁ is smaller than the width of the lower end portions 531a ₂ and 531b ₂ , thereby applying the active material applied onto the metal mesh layer through the holes 532a and 532b. This can be done more easily.

In this case, although the sectional shapes of the upper ends 531a ₁ and 531b ₁ are shown in a semicircular shape in FIG. 8c, the sectional shapes of the upper ends are not limited within a range in which the width of the upper ends is smaller than the width of the lower ends .

In the present invention, the reference of the upper and lower ends is based on the surface of the base substrate to which the respective metal mesh layers are bonded, that is, the first metal mesh pattern is formed with the upper and lower ends And the second metal mesh pattern can be divided into an upper portion and a lower portion based on the second surface of the base substrate.

9A is a photograph showing a cross section of a metal mesh pattern of a secondary battery current collector according to a third embodiment of the present invention, and FIG. 9B is a cross section of a metal mesh pattern of a current collector for secondary batteries according to a fourth embodiment of the present invention. 9C is a photograph showing a cross section of a metal mesh pattern of a current collector for a secondary battery according to a fifth embodiment of the present invention.

As shown in Figs. 9A to 9C, the shape of the metal mesh pattern of the metal mesh layers 330a, 430a, and 530a can be manufactured as described in Figs. 8A to 8C.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100, 200, 300, 400: current collector for secondary batteries
110: base substrate 120a, 120b, 220: adhesive layer
130a, 130b, 230, 330a, 330b, 430a, 430b: metal mesh layer
131a, 131b, 231, 331a, 331b, 431a, 431b: metal mesh pattern
132a, 132b, 232, 332a, 332b, 332a, 332b: holes

Claims (12)

Providing a base substrate;
Providing a metal mesh layer comprising a plurality of metal mesh patterns and holes positioned between the metal mesh patterns;
Forming an adhesive layer on the metal mesh layer; And
Positioning and bonding the adhesive layer on the base substrate,
The adhesive layer is a solder layer, the solder layer is made of lead (Pb), tin (Sn), zinc (Zn), indium (In), cadmium (Cd), bismuth (Bi), or an alloy thereof The manufacturing method of the electrical power collector for batteries. The method according to claim 1,
The metal mesh layer is made of at least one of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co) and alloys thereof. Method of manufacturing a current collector for a battery. delete The method according to claim 1,
Wherein the metal mesh layer comprises a first metal mesh layer and a second metal mesh layer,
Wherein forming the adhesive layer on the metal mesh layer comprises forming a first adhesive layer on the first metal mesh layer and forming a second adhesive layer on the second metal mesh layer,
And the first adhesive layer is located on a first surface of the base substrate, and the second adhesive layer is located on a second surface of the base substrate. The method according to claim 1,
After providing the metal mesh layer,
Pretreating the metal mesh layer; And a first washing step of washing the pretreated metal mesh layer. 6. The method of claim 5,
After the step of forming the adhesive layer on the metal mesh layer,
And a second washing step of washing the metal mesh layer on which the adhesive layer is formed. The method according to claim 1,
Wherein providing the metal mesh layer comprises:
Providing a pole master comprising a mesh having a shape corresponding to a shape of a metal mesh layer to be manufactured;
At least any one of copper (Cu), silver (Ag), chromium (Cr), nickel (Ni), iron (Fe), cobalt (Co), and alloys thereof dissolved in an electrolytic solution is electrodeposited Electrodepositing the metal mesh by electrodeposition;
An electrodeposited layer peeling step of peeling the metal mesh from the mesh; And
A method for manufacturing a current collector for a battery comprising an electrodeposition layer washing step of washing the exfoliated electrodeposition layer. The method of claim 7, wherein
Providing the metal mesh layer comprises providing a metal mesh layer comprising a protective film,
Placing a metal mesh layer on the adhesive layer, and after the step of pressing, further comprising the step of removing the protective film from the metal mesh layer. The method of claim 8,
Wherein the step of providing the metal mesh layer comprising the protective film comprises:
Wherein the step of peeling the electrodeposited layer comprises the step of applying an adhesive to the protective film, laminating the protective film on the metal mesh formed on the mesh, and peeling the protective film and the metal mesh at the same time,
The method of manufacturing a current collector for a battery, characterized in that the step of attaching a protective film on the metal mesh washed through the electrodeposition layer washing step. The method according to claim 1,
A method of manufacturing a current collector for a battery, wherein an active material is applied to the base substrate through the holes positioned between the metal mesh patterns. The method according to claim 1,
Wherein the metal mesh pattern includes a lower end portion and an upper end portion,
The width of the upper end is larger than the width of the lower end of the current collector manufacturing method. The method according to claim 1,
Wherein the metal mesh pattern includes a lower end portion and an upper end portion,
Method of manufacturing a current collector for a battery, characterized in that the width of the metal mesh pattern increases from the lower end to the upper end.

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