Electrode sheet manufacturing apparatus and electrode sheet manufacturing method using electrode sheet manufacturing apparatus

Abstract

The present invention relates to an electrode sheet manufacturing apparatus and an electrode sheet manufacturing method using the same, the apparatus comprising: a winding machine for winding a metal foil; a first coating member located at a rear portion of the winder and coating a first coating material to a predetermined region of the metal foil; and a second coating member that is located between the rewinding device and the first coating member and that coats a second coating material including an electrode active material, in which the coated first coating material and the second coating material do not overlap. A sliding portion can be prevented from being generated outside the electrode.

Description

Technical Field

[0001] This application claims the benefit of priority from Korean Patent Application No. 2023-0187010, filed on December 20, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to an electrode sheet manufacturing apparatus and an electrode sheet manufacturing method using the same. More specifically, the present invention relates to an electrode sheet manufacturing apparatus capable of preventing a slip portion from occurring at a coating portion of an electrode mixture layer coated on a metal foil, and an electrode sheet manufacturing method using the same. Background Art

[0003] Lithium secondary batteries capable of charging and discharging have been widely used as energy sources for wireless mobile devices or wearable devices worn on the body, and are also used as energy sources for electric vehicles and hybrid electric vehicles as alternatives to existing gasoline and diesel vehicles that cause air pollution.

[0004] In order to mass-produce lithium secondary batteries, an electrode sheet is manufactured and divided to form electrodes.

[0005] The general electrode sheet manufacturing process includes the steps of coating the remaining surface of the electrode sheet, excluding the portion where the electrode tab is to be formed, with an electrode active material, and drying and rolling the electrode active material. To use the thus-manufactured electrode sheet for electrode manufacturing, the electrode sheet is cut and then the cut electrode sheet is subjected to a notching process.

[0006] An electrode of a lithium secondary battery includes a coating portion coated with an electrode active material on one or both surfaces of an electrode plate and an uncoating portion not coated with the electrode active material, wherein an electrode tab may be formed at the uncoating portion.

[0007] During the electrode sheet manufacturing process, a phenomenon may occur in which the outer periphery of the coated portion coated with the electrode mixture flows downward before the coated portion dries. This coated portion is called a slip portion. If an electrode sheet including a slip portion (an area where the thickness of the electrode mixture is reduced) is used to manufacture an electrode, and the electrodes and a separator are stacked and laminated, the electrode and separator may separate from each other instead of adhering to each other.

[0008] This phenomenon can reduce the rate at which lithium ions pass through the separator, which can lead to the formation of negative electrode overpotential, severe imbalance in the lithium salt concentration in the electrolyte, and accelerated electrolyte degradation, which can quickly deplete the electrolyte. This can cause lithium precipitation.

[0009] To solve these problems, a method of compensating for the thickness reduction by attaching a CPP film to the sliding portion of the electrode was attempted, but the above problems could not be completely solved.

[0010] Alternatively, an etching process is being developed in which a laser is used to remove the sliding portion during the process of coating the electrode active material, but as the thickness of the electrode active material decreases, the process difficulty may increase and fine pinholes may appear, which may affect the quality of the electrode.

[0011] Patent Document 1 discloses a method of forming a dam coating layer in a shape surrounding a region to be coated with an electrode slurry and coating the region surrounded by the dam coating layer with the electrode slurry to form an electrode mixture layer.

[0012] In Patent Document 1, in order to prevent the electrode slurry from flowing downward, the formation of the sliding portion can be prevented by forming a dam coating at the edge of the electrode slurry, but the process of forming the dam coating and the electrode slurry coating process must be performed separately, which may increase the process time, and the process of filling the area inside the dam coating with the electrode slurry must be performed accurately.

[0013] Patent document 2 relates to an electrode having a binder layer and a method for manufacturing the same, wherein an electrode active material layer is formed on a current collector having an electrode tab formed at one end, a binder layer is formed between the current collector and the electrode active material layer, and a binder layer is formed at each of both ends of the electrode active material layer.

[0014] In Patent Document 2, by applying a binder composition to both ends of a portion to be coated with the electrode slurry before coating the electrode slurry, it is possible to prevent the electrode slurry from falling off the current collector during the current collector cutting process.

[0015] That is, Patent Document 2 does not propose a technology capable of preventing the formation of a sliding portion at the electrode active material layer.

[0016] Therefore, there is a need for a technology that can prevent the formation of a sliding portion on the periphery of a coating portion on which an electrode active material is coated, so that the electrode and the separator adhere to each other across the entire interface therebetween, thereby preventing electrolyte depletion and lithium precipitation, and continuously performing an electrode manufacturing process without delay.

[0017] (Prior art literature)

[0018] (Patent Document 1) Korean Patent Application Publication No. 2023-0006265 (January 10, 2023)

[0019] (Patent Document 2) Korean Patent Application Publication No. 2023-0061044 (May 8, 2023) Summary of the Invention

[0020] Technical issues

[0021] The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrode sheet manufacturing apparatus capable of preventing a slip portion from being formed on the periphery of a coating portion on which an electrode mixture is coated, and an electrode sheet manufacturing method using the same.

[0022] Technical Solution

[0023] In order to achieve the above-mentioned object, the electrode sheet manufacturing device according to the present invention includes: a winding machine (200) configured to wind a metal foil (110); a first coating member (300) located at the rear of the winding machine (200), the first coating member being configured to apply a first coating material (330) to a predetermined area of ​​the metal foil (110); and a second coating member (400) located between the winding machine (200) and the first coating member (300), the second coating member being configured to apply a second coating material (430) containing an electrode active material, wherein the applied first coating material (330) and the applied second coating material (430) do not overlap with each other.

[0024] The first coating material (330) may include a hydrophobic material.

[0025] The first coating material (330) may include a volatile material.

[0026] The electrode sheet manufacturing apparatus may further include a drying member (500) located between the winding machine (200) and the second coating member (400), the drying member being configured to volatilize the first coating material (330).

[0027] Each of the first coating member (300) and the second coating member (400) may be a slot die.

[0028] The first coating member (300) may include at least one first nozzle (310) and a first coating material supply unit (320) configured to supply a first coating material (330) to the first nozzle (310), and the second coating member (400) may include at least one second nozzle (410) and a second coating material supply unit (420) configured to supply a second coating material (430) to the second nozzle (410).

[0029] Each of the first nozzle (310) and the second nozzle (410) may be provided as one, and the first nozzle (310) and the second nozzle (410) may be positioned so as not to overlap each other in the longitudinal direction (x) of the metal foil (110).

[0030] The first nozzle (310) may be provided as one, and the second nozzle (410) may be provided as two, and the first nozzle (310) and the second nozzle (410) may be positioned not to overlap each other in the longitudinal direction (x) of the metal foil.

[0031] Each of the first nozzle (310) and the second nozzle (410) can be set in plurality in a manner spaced apart from each other by a predetermined distance in the width direction (y) of the metal foil (110), and the first nozzle (310) and the second nozzle (410) can be positioned so as not to overlap each other in the longitudinal direction (x) of the metal foil (110).

[0032] The second coating material (430) may include a hydrophilic material.

[0033] The present invention provides an electrode sheet manufacturing method using the above-mentioned electrode sheet manufacturing device. Specifically, the electrode sheet manufacturing method includes the following steps: a first step of supplying a metal foil (110); a second step of coating the metal foil (110) with a first coating material (330) including a hydrophobic material; and a third step of coating the metal foil (110) with a second coating material (430) including an electrode active material, wherein the first coating material (330) and the second coating material (430) are continuously applied to the metal foil (110) in a longitudinal direction (x).

[0034] The first coating material (330) and the second coating material (430) may not overlap each other.

[0035] The electrode sheet manufacturing method may further include a fourth step of drying the metal foil (110) coated with the first coating material (330) and the second coating material (430) after the third step.

[0036] In the second step, the first coating material (330) may be provided in plural in such a manner as to be spaced apart from each other in the width direction (y) of the metal foil (110).

[0037] The second coating material (430) may include a hydrophilic material.

[0038] Furthermore, the present invention can provide various combinations of the above-mentioned solutions.

[0039] Beneficial effects

[0040] It is obvious from the above description that in the electrode sheet manufacturing device according to the present invention and the electrode sheet manufacturing method using the electrode sheet manufacturing device, when the first coating material containing a hydrophobic material is applied to a predetermined area of ​​the metal foil and the second coating material containing a hydrophilic material is applied to the remaining area not coated with the first coating material, the first coating material can be used as a protrusion to prevent the second coating material from flowing downward, thereby preventing a sliding portion from being formed on the periphery of the second coating material.

[0041] In addition, the electrode sheet manufacturing device and the electrode sheet manufacturing method using the electrode sheet manufacturing device according to the present invention have the following advantages: the first coating material contains a volatile material, which can be volatilized and removed during the drying process of the electrode sheet, so there is no need for a separate device or process for removing the first coating material.

[0042] In addition, in the electrode manufactured by the electrode sheet manufacturing device according to the present invention and the electrode sheet manufacturing method using the electrode sheet manufacturing device, the coating portion has no sliding portion, so that the entire area opposite to the diaphragm can be bonded to the diaphragm, thereby preventing electrolyte depletion or lithium ion precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 1 is a perspective view of an electrode sheet manufacturing apparatus according to a first embodiment of the present invention.

[0044] Figure 2 1 is a perspective view of an electrode sheet manufacturing apparatus according to a second embodiment of the present invention.

[0045] Figure 3 1 is a perspective view of an electrode sheet manufacturing apparatus according to a third embodiment of the present invention.

[0046] Figure 4 It is along Figure 3 Cross-sectional views taken along lines A-A', B-B', C-C' and D-D'.

[0047] Figure 5 It is a perspective view of an electrode sheet manufacturing apparatus according to a fourth embodiment of the present invention.

[0048] Figure 6 1 is a perspective view of an electrode sheet manufacturing apparatus according to a fifth embodiment of the present invention.

[0049] Figure 7 is a flow chart of a method for manufacturing an electrode sheet according to the present invention.

[0050] Figure 8 It is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the first embodiment, illustrating the process of forming an electrode.

[0051] Figure 9 It is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the second embodiment, illustrating the process of forming an electrode.

[0052] Figure 10 It is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the third embodiment, illustrating the process of forming an electrode.

[0053] Figure 11 1 is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the third embodiment, illustrating a process of forming electrodes having different shapes.

[0054] Figure 12 is a plan view of an improved electrode sheet, illustrating the process of forming the electrode. DETAILED DESCRIPTION

[0055] Now, the preferred 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 implement the preferred embodiments of the present invention. However, when describing the operating principles of the preferred embodiments of the present invention in detail, when the known functions and configurations incorporated herein may obscure the subject matter of the present invention, their detailed description will be omitted.

[0056] Throughout the drawings, the same reference numerals will be used to refer to components that perform similar functions or operations. Throughout the specification, when it is mentioned that a component is connected to another component, the component may not only be directly connected to the other component, but also be indirectly connected to the other component through another component. In addition, the inclusion of a certain element does not mean the exclusion of other elements, but rather means that these elements may be further included unless otherwise specified.

[0057] Unless otherwise specified, the description embodying elements by definition or addition is applicable to all inventions and does not limit a specific invention.

[0058] In the description and claims of the present application, unless otherwise stated, the singular form is intended to include the plural form.

[0059] In the invention description and claims of this application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" means three cases, namely, the case including A, the case including B, and the case including A and B.

[0060] The metal foil in this specification is an object that is configured in the form of a sheet and on which a first coating material and a second coating material are coated.

[0061] Furthermore, the electrode sheet is defined as a metal foil coated with at least one of a first coating material and a second coating material before being cut.

[0062] In addition, the electrode mixture includes a positive electrode active material or a negative electrode active material, a conductive agent, a binder, a solvent, and additives, and conceptually includes an electrode slurry (electrode mixture before drying).

[0063] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0064] Figure 1 1 is a perspective view of an electrode sheet manufacturing apparatus according to a first embodiment of the present invention.

[0065] like Figure 1 As shown, the electrode sheet manufacturing apparatus according to the first embodiment includes: an unwinder 100 for unwinding a metal foil 110; a winder 200 for winding the metal foil 110; a first coating member 300, which is configured to apply a first coating material 330 to a predetermined area of ​​the metal foil 110 unwound from the unwinder 100; a second coating member 400, which is configured to apply a second coating material 430 containing an electrode active material; and a drying member 500, which is configured to volatilize the first coating material 330.

[0066] Specifically, the unwinder 100 and the winder 200 are configured to continuously or intermittently transfer a wound metal foil 110 in one direction.

[0067] The first coating member 300 includes: a first nozzle 310, which is located at a middle position of the metal foil 110 in the width direction y, so that the first coating material 330 can be continuously coated on the metal foil 110 in the longitudinal direction x; and a first coating material supply unit 320, which is configured to supply the first coating material 330 to the first nozzle 310.

[0068] Here, the first coating material 330 may include a hydrophobic polymer, a hydrophobic solvent and a volatile material, and the hydrophobic polymer may be at least one selected from polybutadiene, polyurethane, polyimide, polyester, polycarbonate, polyphenylene sulfide (PPS), polyolefin, polydimethylsiloxane (PDMS), styrene-butadiene copolymer, (meth)acrylate, polyacrylonitrile (PAN), polytetrafluoroethylene (PTFE) and a mixture thereof.

[0069] The hydrophobic solvent may be at least one selected from propanol, butanol, pentanol, hexanol, ethylene glycol, propylene glycol, diethylene glycol, glycerol, and mixtures thereof.

[0070] The second coating member 400 positioned between the winder 200 and the first coating member 300 includes two second nozzles 410 and a second coating material supply unit 420 configured to supply a second coating material 430 to the second nozzles 410 .

[0071] Here, the second nozzle 410 is preferably positioned not to overlap with the first nozzle 310 in the longitudinal direction x, so as to minimize overlap between the first coating material 330 and the second coating material 430 and enable the second coating material 430 to be continuously coated on the metal foil 110 in the longitudinal direction x.

[0072] The second coating material 430 may be an electrode mixture including an electrode active material, a binder, a conductive agent, an additive, and a solvent, each of which may include a hydrophilic material.

[0073] For example, a polar solvent may be used as the hydrophilic solvent constituting the second coating material 430, and water may be a representative hydrophilic solvent. In addition, the hydrophilic binder may include at least one hydrophilic monomer selected from (meth) acrylic acid, itaconic acid, sodium p-styrenesulfonate, sodium vinylsulfonate, sodium allylsulfonate, sodium 2-methylallylsulfonate, sodium ethyl methacrylatesulfonate, (meth)acrylamide, N-hydroxymethylacrylamide, N,N-dimethylacrylamide, and 2-acrylamide-2-methylpropanesulfonic acid.

[0074] The electrode active material may include a conventional positive electrode active material and a conventional negative electrode active material used for a lithium secondary battery, and the type of the electrode active material is not limited.

[0075] Meanwhile, the first nozzle 310 and the second nozzle 410 may be slot dies capable of extruding the first coating material 330 and the second coating material 430 supplied in the form of electrode slurry to one surface of the metal foil 110 so as to be coated thereon.

[0076] In this way, the first coating material 330 includes a hydrophobic material, and the second coating material 430 includes a hydrophilic material. Therefore, even if the second coating material 430 is added to a portion of the area where the first coating material 330 has been applied, the second coating material 430 can be prevented from being applied to the area where the first coating material 330 has been applied, and thus the second coating material 430 is applied only to the remaining area except for the area where the first coating material 330 has been applied.

[0077] The drying member 500 located between the second coating member 400 and the winder 200 is configured to volatilize the first coating material 330 while drying the second coating material 430 .

[0078] Specifically, the metal foil 110 to which the first coating material 330 and the second coating material 430 have been added is dried while passing through the drying member 500. The drying member 500 may be configured in the form of a chamber through which the metal foil 110 can pass, or may be configured to heat the upper and lower surfaces of the metal foil 110 to dry it.

[0079] Thus, in the present invention, the process of drying the first coating material 330 and the process of drying the second coating material 430 are performed simultaneously, so the manufacturing process is simpler and the manufacturing cost is lower than when the first coating material and the second coating material are dried separately.

[0080] As described above, an uncoated portion from which the first coating material 330 has been removed and a coated portion from which the second coating material 430 has been coated are formed on the metal foil 110 that has passed through the drying member 500 , thereby manufacturing an electrode sheet.

[0081] Despite Figure 1 Although not shown, a support member (not shown) configured to support the metal foil 110 may be further provided below the metal foil 110 , and a first nozzle and a second nozzle may be further provided below the metal foil 110 .

[0082] Figure 2 : is a perspective view of an electrode sheet manufacturing apparatus according to a second embodiment of the present invention. Figure 2 , the electrode sheet manufacturing apparatus according to the second embodiment is the same as the electrode sheet manufacturing apparatus according to the first embodiment except for the positions and numbers of the first nozzle 310 and the second nozzle 410 .

[0083] Specifically, two first nozzles 310 configured to discharge the first coating material 330 are respectively located at both ends of the metal foil 110 in the width direction Y, and one second nozzle 410 is configured to discharge the second coating material 430 .

[0084] Of course, the first nozzle 310 and the second nozzle 410 are positioned so as not to overlap with each other in the longitudinal direction x to minimize overlap between the first coating material 330 and the second coating material 430 .

[0085] Figure 3 is a perspective view of an electrode sheet manufacturing apparatus according to a third embodiment of the present invention, and Figure 4 It is along Figure 3 Cross-sectional views taken along lines A-A', B-B', C-C' and D-D'. Figure 3 , the electrode sheet manufacturing apparatus according to the third embodiment is the same as the electrode sheet manufacturing apparatus according to the first embodiment except for the positions and the number of the first nozzle 310 and the second nozzle 410 .

[0086] Specifically, four first nozzles 310 configured to discharge the first coating material 330 are arranged at both ends of the metal foil 110 in the width direction Y and between the two ends of the metal foil so as to be spaced apart from each other by a predetermined distance; and three second nozzles 410 configured to discharge the second coating material 430 are arranged in the width direction Y of the metal foil 110.

[0087] Of course, the first nozzle 310 and the second nozzle 410 are positioned so as not to overlap with each other in the longitudinal direction x to minimize overlap between the first coating material 330 and the second coating material 430 .

[0088] At the same time, Figure 4 In the embodiment, (a) is the process of the metal foil 110 passing through the first coating member 300 along the Figure 3 (b) is a vertical cross-sectional view taken along the line AA' in the metal foil 110 after it has passed through the first coating member 300 Figure 3 (c) is a vertical cross-sectional view taken along the line BB' in FIG. 4, whereby the first coating material 330 has been applied; (d) is a vertical cross-sectional view taken along the line BB' in FIG. 4, whereby the first coating material 330 has been applied; (e) is a vertical cross-sectional view taken along the line BB' in FIG. Figure 3 A vertical cross-sectional view taken along line CC' in FIG, whereby the second coating material 430 has been applied between the first coating material 330; and (d) is a ... Figure 3 sectional view taken along line DD' in FIG. 3 , whereby the first coating material 330 has been removed.

[0089] Since the first coating material 330 is added to the metal foil 110 to prevent the second coating material 430 from flowing downward, it is preferable to control the discharge amount of the first coating material so that the thickness D1 of the first coating material is equal to or less than the thickness D2 of the second coating material 430 .

[0090] Of course, since the first coating material 330 includes a volatile material and may be volatilized and removed by the drying member 500 , the thickness D1 of the first coating material 330 may be formed to be greater than the thickness D2 of the second coating material.

[0091] Since the second coating material 430 is applied between the first coating material 330, the first coating material 330 can be used as a bump to prevent the second coating material 430 from flowing downward, so that no inclined sliding part is formed on the periphery of the second coating material 430, and the overall thickness of the second coating material 430 is uniform.

[0092] Figure 5 It is a perspective view of an electrode sheet manufacturing apparatus according to a fourth embodiment of the present invention.

[0093] Reference Figure 5, the electrode sheet manufacturing apparatus according to the fourth embodiment is substantially similar to the electrode sheet manufacturing apparatus according to the second embodiment except for its appearance.

[0094] Specifically, in the second embodiment, the first coating material 330 and the second coating material 430 are supplied from the side, whereas in the fourth embodiment, the first coating material 330 and the second coating material 430 are supplied from above.

[0095] Figure 6 : is a perspective view of an electrode sheet manufacturing apparatus according to a fifth embodiment of the present invention. Figure 6 , the electrode sheet manufacturing apparatus according to the fifth embodiment is substantially similar to the electrode sheet manufacturing apparatus according to the third embodiment except for its appearance.

[0096] Specifically, in the third embodiment, the first coating material 330 and the second coating material 430 are supplied from the side, whereas in the fifth embodiment, the first coating material 330 and the second coating material 430 are supplied from above.

[0097] Hereinafter, a method for manufacturing an electrode sheet using the above-mentioned electrode sheet manufacturing apparatus will be described. Figure 7 is a flow chart of a method for manufacturing an electrode sheet according to the present invention, and Figure 8 It is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the first embodiment, illustrating the process of forming an electrode.

[0098] Reference Figure 7 , the electrode sheet manufacturing method according to the present invention includes: a first step of supplying a metal foil; a second step of coating the metal foil with a first coating material including a hydrophobic material; and a third step of coating the metal foil with a second coating material including an electrode active material; and a fourth step of drying the metal foil coated with the first coating material and the second coating material.

[0099] As described above, the first coating material 330 and the second coating material 430 are continuously applied to the metal foil 110 in the length direction, but the first coating material 330 and the second coating material 430 do not overlap each other, and the first coating material 330 is volatilized during the drying process.

[0100] Therefore, if Figure 8 As shown, the electrode sheet 1000 is formed so that the middle of the electrode sheet coated with the first coating material in the width direction is an uncoated portion from which the metal foil 110 is exposed, and coated portions coated with the second coating material 430 are provided on both sides of the uncoated portion.

[0101] When manufacturing an electrode using the electrode sheet 1000 having the above-described shape, the electrode sheet 1000 is cut along the cutting line in the width direction of the electrode sheet 1000 .

[0102] That is, the electrode sheet 1000 is cut in the width direction, and the middle portion of the electrode sheet from which the metal foil 110 is exposed and the coated portion to which the second coating material has been applied are cut along the thick dotted line, thereby obtaining a plurality of electrodes 1100 each having an electrode tab 1110.

[0103] Figure 9 FIG2 is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the second embodiment, showing the process of forming an electrode. Figure 9 When the electrode sheet manufacturing device according to the second embodiment is used, the electrode sheet 1000 is formed so that the two side edges of the electrode sheet that have been coated with the first coating material in the width direction are uncoated portions, from which the metal foil 110 is exposed, and a coated portion that has been coated with the second coating material 430 is provided between the uncoated portions (i.e., in the middle of the electrode sheet).

[0104] When an electrode is manufactured using an electrode sheet 1000 having the above-mentioned shape, the electrode sheet 1000 is cut in the longitudinal direction, and the uncoated portions and coated portions formed on both side edges of the electrode sheet, where the metal foil 110 is exposed, are cut along the thick dotted lines, thereby obtaining a plurality of electrodes 1100 each having an electrode connector 1110.

[0105] Figure 10 FIG3 is a plan view of an electrode sheet manufactured using the electrode sheet manufacturing apparatus according to the third embodiment, showing the process of forming an electrode. Figure 10 When the electrode sheet manufacturing device according to the third embodiment is used, the electrode sheet 1000 is formed so that four areas including the edges on both sides of the electrode sheet in the width direction, which have been coated with the first coating material, are uncoated portions from which the metal foil 110 is exposed, and three coated portions, which have been coated with the second coating material 430, are arranged between the uncoated portions (i.e., in the middle of the electrode sheet).

[0106] When manufacturing an electrode using the electrode sheet 1000 having the above-described shape, the electrode sheet 1000 is cut in the longitudinal direction, and the uncoated portion and the coated portion where the metal foil 110 is exposed are cut along the thick dot-dash lines, thereby obtaining a plurality of electrodes 1100 each having an electrode tab 1110 .

[0107] exist Figure 10 In the electrode sheet 1000 , the sizes of the cut lines indicated by the thick dot-dash lines are different, thereby making it possible to manufacture electrodes 1100 of two different sizes.

[0108] Figure 11 FIG3 is a plan view of an electrode sheet manufactured using an electrode sheet manufacturing apparatus according to a third embodiment, illustrating a process of forming electrodes having different shapes. Figure 11 When the electrode sheet manufacturing device according to the third embodiment is used, the electrode sheet 1000 is formed so that four areas including the edges on both sides of the electrode sheet in the width direction, which have been coated with the first coating material, are uncoated portions from which the metal foil 110 is exposed, and three coated portions, which have been coated with the second coating material 430, are provided between the uncoated portions (i.e., in the middle of the electrode sheet).

[0109] When manufacturing an electrode using the electrode sheet 1000 having the above-described shape, the electrode sheet 1000 is cut in the longitudinal direction, and the uncoated portion and the coated portion where the metal foil 110 is exposed are cut along the thick dot-dash lines, thereby obtaining a plurality of electrodes 1100 each having an electrode tab 1110 .

[0110] Figure 12 1 is a plan view of an improved electrode sheet, showing the process of forming the electrode. Figure 12 , an electrode sheet manufacturing apparatus in which three first nozzles and three second nozzles are alternately arranged can be used to manufacture the electrode sheet 1000. The electrode sheet 1000 is formed so that the three areas where the first coating material ejected from the first nozzle has been applied are uncoated portions from which the metal foil 110 is exposed, and the remaining three areas other than the uncoated portions are coated portions to which the first coating material has been applied.

[0111] When manufacturing an electrode using the electrode sheet 1000 having the above-described shape, the electrode sheet 1000 is cut in the longitudinal direction, and the uncoated portion and the coated portion where the metal foil 110 is exposed are cut along the thick dot-dash lines, thereby obtaining a plurality of electrodes 1100 each having an electrode tab 1110 .

[0112] In the electrodes manufactured through this process, no slipping occurs at the coated portion where the electrode active material has been applied. Therefore, when the electrodes and separator are stacked and laminated, they do not separate from each other, minimizing conventional problems such as increased resistance, electrolyte depletion, and lithium precipitation.

[0113] Those skilled in the art to which the present invention pertains will appreciate that, based on the above description, various applications and modifications are possible within the scope of the present invention.

[0114] (Description of Reference Signs)

[0115] 100: Unwinding machine

[0116] 110: Metal foil

[0117] 200: Winding machine

[0118] 300: First coating member

[0119] 310: First nozzle

[0120] 320: First coating material supply unit

[0121] 330: First coating material

[0122] 400: Second coating member

[0123] 410: Second nozzle

[0124] 420: Second coating material supply unit

[0125] 430: Second coating material

[0126] 500: Dry components

[0127] 1000: Electrode sheet

[0128] 1100: Electrode

[0129] 1110: Electrode connector

[0130] D1: Thickness of the first coating material

[0131] D2: thickness of the second coating material

Claims

1. An electrode sheet manufacturing device, comprising: a winder configured to wind the metal foil; a first coating member located at a rear portion of the winder, the first coating member applying a first coating material to a predetermined area of ​​the metal foil; as well as a second coating member located between the winding machine and the first coating member, the second coating member applying a second coating material including an electrode active material, wherein The applied first coating material and the applied second coating material do not overlap each other.

2. The electrode sheet manufacturing device according to claim 1, wherein: The first coating material includes a hydrophobic material.

3. The electrode sheet manufacturing device according to claim 2, wherein: The first coating material includes a volatile material.

4. The electrode sheet manufacturing device according to claim 3, wherein: A drying member for volatilizing the first coating material is further included between the winder and the second coating member.

5. The electrode sheet manufacturing device according to claim 1, wherein: The first coating member and the second coating member are slot dies.

6. The electrode sheet manufacturing device according to claim 1, wherein: The first coating member includes at least one first nozzle and a first coating material supply unit for supplying the first coating material to the first nozzle, and The second coating member includes at least one second nozzle and a second coating material supply unit for supplying the second coating material to the second nozzle.

7. The electrode sheet manufacturing device according to claim 6, wherein: Each of the first nozzle and the second nozzle is provided in one, and The first nozzle and the second nozzle are positioned so as not to overlap each other in the longitudinal direction (x) of the metal foil.

8. The electrode sheet manufacturing device according to claim 6, wherein: The first nozzle is provided as one and the second nozzle is provided as two, and The first nozzle and the second nozzle are positioned so as not to overlap each other in the longitudinal direction (x) of the metal foil.

9. The electrode sheet manufacturing device according to claim 6, wherein: Each of the first nozzle and the second nozzle is provided in plural in such a manner as to be spaced apart from each other by a predetermined distance in the width direction (y) of the metal foil, and The first nozzle and the second nozzle are positioned so as not to overlap each other in the longitudinal direction (x) of the metal foil.

10. The electrode sheet manufacturing device according to claim 1, wherein: The second coating material includes a hydrophilic material.

11. A method for manufacturing an electrode sheet, comprising the following steps: a first step of supplying a metal foil; a second step of coating the metal foil with a first coating material including a hydrophobic material; as well as a third step of coating the metal foil with a second coating material including an electrode active material, in, The first coating material and the second coating material are continuously applied along the longitudinal direction (x) of the metal foil.

12. The method for manufacturing an electrode sheet according to claim 11, wherein: The first coating material and the second coating material do not overlap each other. 13 . The electrode sheet manufacturing method according to claim 11 , further comprising a fourth step of drying the metal foil coated with the first coating material and the second coating material after the third step.

14. The method for manufacturing an electrode sheet according to claim 12, wherein: In the second step, the first coating material is provided in plural numbers so as to be spaced apart from each other in the width direction (y) of the metal foil.

15. The method for manufacturing an electrode sheet according to claim 12, wherein: The second coating material includes a hydrophilic material.

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