Shim plate and die coater including same

Abstract

According to an exemplary embodiment of the present invention, there is provided a shim plate configured to discharge electrode slurry in a first direction, the shim plate including a base extending in a second direction perpendicular to the first direction, a separator connected to the base and protruding from the base in the first direction, wings connected to both ends of the base in the second direction, and guides connected to each wing and protruding from the wing toward the separator in the second direction, wherein the length of each guide in the second direction is within a range of 4 mm to 50 mm.

Description

[Technical Field]

[0001] The present invention relates to a shim plate and a die coater including the same. This application claims the benefit of Korean Application No. 2023-0039617, filed on March 27, 2023, which is incorporated herein by reference in its entirety. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing cost per unit capacity of secondary batteries. As the driving range of battery electric vehicles (BEVs) has increased to the same level as fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] Electrodes of secondary batteries are the most important components of secondary batteries in terms of energy density. Secondary battery electrodes can be formed through a coating process, a roll press process, a drying process, a slitting process, and a notching process. Among these processes, the coating process is a process of applying a slurry containing an active material onto an electrode plate, and can be performed using a die coater. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the technical concept of the present invention is to provide a shim plate with improved reliability and a die coater including the same. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention for solving the above-mentioned problems, there is provided a shim plate configured to discharge electrode slurry in a first direction, the shim plate including a base extending in a second direction perpendicular to the first direction, a separator connected to the base and protruding from the base in the first direction, wings connected to both ends of the base in the second direction, and guides connected to each wing and protruding from the wing toward the separator in the second direction, wherein the length of each guide in the second direction is within a range of 4 mm to 50 mm.

[0006] The length of each guide in the second direction is 20 mm or less.

[0007] The length of each guide in the second direction is 10 mm or less.

[0008] According to an exemplary embodiment, there is provided a die coater including: a first die including a manifold to which an electrode slurry is supplied; and a shim plate disposed on the first die and including a slit as a path through which the slurry is discharged, the shim plate including: a base extending in a second direction perpendicular to the first direction in which the slurry is discharged; wings connected to ends of the base in the second direction; and guides connected to the wings and protruding from the wings toward a center of the base in the second direction, the base partially covering the manifold.

[0009] The width of the manifold exposed from the base in the first direction is within a range of 5 mm to 50 mm.

[0010] The width of the manifold exposed from the base in the first direction is 20 mm or less.

[0011] The width of the manifold exposed from the base in the first direction is 10 mm or less.

[0012] The length of each guide in the second direction is within a range of 4 mm to 50 mm.

[0013] The length of each guide in the second direction is 20 mm or less.

[0014] The length of each guide in the second direction is 10 mm or less.

[0015] According to an exemplary embodiment, there is provided a die coater including: a first die including a manifold to which an electrode slurry is supplied; and a shim plate disposed on the first die and including a slit as a path through which the slurry is discharged, the shim plate including a base extending in a second direction perpendicular to the first direction in which the slurry is discharged, wings connected to ends of the base in the second direction, and guides connected to the wings and protruding from the wings toward a center of the base in the second direction, the length of each guide in the second direction being within a range of 4 mm to 50 mm.

[0016] The length of each guide in the second direction is 10 mm or less.

[0017] The length of the base in the first direction is within a range of 25 mm to 100 mm.

[0018] The length of the base in the first direction is 50 mm or more. [Effects of the Invention]

[0019] According to an exemplary embodiment of the present invention, the length of each guide of the shim plate is within a range of 4 mm to 50 mm, and the width of the base of the shim plate is greater than the length of each guide, thereby preventing the shim plate from being deformed due to fine alignment of the shim plate.

[0020] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a die coater according to an exemplary embodiment. [Figure 2] FIG. 1 is an exploded perspective view of a die coater according to an exemplary embodiment. [Figure 3] FIG. [Figure 4] 1 shows a shim plate placed on the first die. [Figure 5] 10 is a graph illustrating an effect of a shim plate according to an exemplary embodiment. [Figure 6] 1 is a flowchart illustrating a method for manufacturing a secondary battery according to an exemplary embodiment. [Figure 7] 1 is a diagram illustrating a method for manufacturing a secondary battery according to an exemplary embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concepts of the terms to best describe his own invention.

[0023] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0024] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0025] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and therefore the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0026] (First embodiment) FIG. 1 is a perspective view of a die coater 100 according to an exemplary embodiment.

[0027] FIG. 2 is an exploded perspective view of a die coater 100 according to an exemplary embodiment.

[0028] 1 and 2, die coater 100 may include a first die 110, a second die 120, and a shim plate 130. According to an exemplary embodiment, die coater 100 may be configured to dispense an electrode slurry. According to an exemplary embodiment, die coater 100 may be configured to coat an electrode plate with the electrode slurry.

[0029] The electrode slurry can be used to manufacture electrodes for secondary batteries. The electrode slurry can include an electrode active material, a conductive material, a binder, and a solvent. The electrode slurry can be manufactured by dissolving the electrode active material, the conductive material, the binder, and the like in a solvent. The solvent can disperse the electrode active material and the like. The solvent can be an aqueous solvent or a non-aqueous solvent. The solvent can include any one of dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, and mixtures thereof. The amount of solvent used can be determined based on the target viscosity of the slurry. Parameters for determining the amount of solvent used include the coating thickness of the slurry, production yield, and workability.

[0030] The positive electrode active material is a material capable of undergoing an electrochemical reaction. The positive electrode active material can be a lithium transition metal oxide. Examples of the positive electrode active material include layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; and lithium manganese oxides with the chemical formula LiNi 1-y M y Lithium nickel-based oxide represented by O2 (where M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≦y≦0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+z Ni 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e(Here, -0.5 ≤ z ≤ 0.5, 0.1 ≤ b ≤ 0.8, 0.1 ≤ c ≤ 0.8, 0 ≤ d ≤ 0.2, 0 ≤ e ≤ 0.2, b + c + d < 1, M is any one of Al, Mg, Cr, Ti, Si and Y, and A is any one of F, P and Cl) lithium nickel cobalt manganese composite oxide; and chemical formula Li 1+x M 1-y M’ y PO 4-z X z (Here, M is a transition metal, more specifically, any one of Fe, Mn, Co and Ni, M’ is any one of Al, Mg and Ti, X is any one of F, S and N, -0.5 ≤ x ≤ +0.5, 0 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.1) and may include any one of olivine-type lithium metal phosphates represented by the formula.

[0031] The negative electrode active material may include carbon such as graphitizable carbon and graphite-based carbon. The negative electrode active material may include, for example, Li x Fe2O3 (0 ≤ x ≤ 1), Li x WO2 (0 ≤ x ≤ 1), Sn x Me 1-x Me’ y O z (Here, Me is any one of Mn, Fe, Pb and Ge, Me’ is any one of Al, B, P, Si, Group 1 elements of the periodic table, Group 2 elements, Group 3 elements and halogens; 0 < x ≤ 1; 1 ≤ y ≤ 3; 1 ≤ z ≤ 8) and may include metal composite oxides such as. The negative electrode active material may include, for example, lithium metal; lithium alloy; silicon-based alloy; and tin-based alloy. The negative electrode active material may include metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, and Bi2O5. The negative electrode active material may also include conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like. [[ID=​The conductive material may be conductive without inducing chemical changes in the final secondary battery. Examples of the conductive material include graphite such as natural graphite and artificial graphite; carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fiber and metal fiber; metal powders such as carbon fluoride, aluminum, and nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; polyphenylene derivatives, etc.

[0033] The binder can improve the bond between the active material and the conductive material and the bonding strength to the electrode plate. Examples of binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, and various copolymers.

[0034] A sheet-like electrode can be formed by applying an electrode slurry containing an electrode active material onto an electrode plate, drying it, and rolling it to form an electrode mixture layer. The electrode slurry can be applied to the electrode plate using a coating die. The coating die can be, for example, a slot die. The electrode plate can be a positive electrode plate or a negative electrode plate, and the electrode active material can be a positive electrode active material or a negative electrode active material.

[0035] The thickness of the positive electrode plate may be within a range of approximately 3 μm to approximately 500 μm. The positive electrode plate may not induce chemical changes in the final secondary battery and may have high conductivity. The positive electrode plate may include, for example, any one of stainless steel, nickel, titanium, calcined carbon, and aluminum. The positive electrode plate may also include stainless steel surface-treated with carbon, nickel, titanium, silver, or the like. The surface of the positive electrode plate may include a micro-textured structure to enhance the adhesion of the active material. The shape of the positive electrode plate may include any one of a film, sheet, foil, net, porous material, foam, and nonwoven fabric.

[0036] The thickness of the negative electrode plate may be in the range of about 3 μm to about 500 μm. The negative electrode plate may not induce chemical changes in the final secondary battery and may have high conductivity. The negative electrode plate may include any one of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and aluminum-cadmium alloy. The negative electrode plate may also include stainless steel surface-treated with carbon, nickel, titanium, silver, or the like. The surface of the negative electrode plate may include a micro-textured structure to enhance the adhesion of the active material. The shape of the negative electrode plate may include any one of a film, sheet, foil, net, porous material, foam, and nonwoven fabric.

[0037] The shim plate 130 may be interposed between the first die 110 and the second die 120. The first die 110 may contact the bottom surface of the shim plate 130. The second die 120 may contact the top surface of the shim plate 130.

[0038] Hereinafter, the technical concept of the present invention will be described based on an embodiment in which the first die 110 and the second die 120 are separate and distinct elements, as described above. Based on what is described herein, a person skilled in the art can easily arrive at an embodiment in which the first die 110 and the second die 120 are integrated to form an integrated die.

[0039] According to an exemplary embodiment, the first die 110 and the second die 120 may have shapes that are symmetrical to each other. According to an exemplary embodiment, the first die 110 and the second die 120 may each have a shape that is approximately a truncated square pyramid, but is not limited to such.

[0040] The first die 110 may include a manifold 111 and holes 110H connected to the manifold 111. The electrode slurry may flow into the manifold 111 through the holes 110H. After the electrode slurry fills the manifold 111, the electrode slurry may be discharged to the outside of the die coater 100. The electrode slurry may be discharged from the manifold 111 to the outside through slits 130S1 and 130S2 of the shim plate 130.

[0041] The manifold 111 may have a well shape having a predetermined depth from the top surface of the first die 110. The manifold 111 may include a first side 111S1 and a second side 111S2 that are substantially parallel to each other. The first side 111S1 may be in the direction in which the electrode slurry is discharged. The second side 111S2 may be opposite to the first side 111S1. The manifold 111 may include an inclined surface connected to the first side 111S1, thereby allowing the electrode slurry to be stably discharged from the die coater 100.

[0042] (Second embodiment) FIG. 3 is a plan view of the shim plate 130. As shown in FIG.

[0043] FIG. 4 shows a shim plate 130 positioned on the first die 110 .

[0044] Referring to FIGS. 3 and 4, the shim plate 130 is disposed on the first die 110 .

[0045] Referring to FIG. 3, the shim plate 130 may include a base 131 , a separator 133 , wings 135 , and a guide 137 .

[0046] The X direction may be the ejection direction of the electrode slurry. The Y direction may be substantially perpendicular to the X direction. The Z direction may be substantially perpendicular to both the X direction and the Y direction. The Z direction may be the thickness direction of the shim plate 130.

[0047] According to an exemplary embodiment, the base 131 may extend in the Y direction. The Y direction may also be referred to as the longitudinal direction of the base 131. The base 131 may partially overlap the manifold 111 in the Z direction. The base 131 may partially cover the manifold 111 in the Z direction.

[0048] According to an exemplary embodiment, the separator 133 may be coupled to the base 131. The separator 133 may protrude from the base 131 in the X direction. As a non-limiting example, the separator 133 may be located at the center of the base 131 in the Y direction. The separator 133 may separate the slit 130S1 and the slit 130S2. The separator 133 may separate the areas into which the slurry is discharged.

[0049] According to an exemplary embodiment, the shim plate 130 may include two or more separators, resulting in three or more slits, such that the two or more separators may evenly divide the space between the guides 137 to provide slits with substantially the same width in the Y direction.

[0050] According to an exemplary embodiment, the wings 135 may be connected to both ends of the base 131 in the Y direction. The length of the wings 135 in the X direction may be greater than the length L1 of the base 131 in the X direction. The side of the wings 135 perpendicular to the X direction may form a coplanar surface CS with the side of the base 131 perpendicular to the X direction. The coplanar surface CS may be opposite the portion of the shim plate 130 in which the slits 130S1 and 130S2 are formed.

[0051] According to an exemplary embodiment, the guide 137 may protrude in the Y direction from the wing 135. The guide 137 may determine the width of each of the slits 130S1 and 130S2 in the Y direction. Depending on the length L2 of the guide 137, the width of the entire area on the electrode plate where the electrode slurry is applied may be determined.

[0052] According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be in the range of approximately 25 mm to approximately 100 mm. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 30 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 35 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 40 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 45 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 50 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 55 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 60 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 65 mm or more. According to an exemplary embodiment, the length L1 of the base 131 in the X direction may be approximately 70 mm or more.

[0053] According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be in the range of approximately 4 mm to approximately 50 mm. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 45 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 40 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 35 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 30 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 25 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 20 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 15 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 10 mm or less. According to an exemplary embodiment, the length L2 of each guide 137 in the Y direction may be approximately 5 mm or less.

[0054] According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be in the range of 5 mm to 50 mm. Experimental examples have confirmed that when the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 is 5 mm or more, the discharge performance of the coating die 100 (see FIG. 1) is not limited by the shim plate 130. Experimental examples have also confirmed that when the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 is less than 5 mm, the discharge performance of the coating die 100 (see FIG. 1) is reduced. The distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be the width of the manifold 111 exposed by the base 131 in the X direction.

[0055] According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 45 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 40 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 35 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 30 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 25 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 20 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 15 mm or less. According to an exemplary embodiment, the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 may be 10 mm or less.

[0056] After the shim plate 130 is placed on the first die 110, the position of the shim plate 130 can be precisely aligned for precise coating. Conventional shim plates are easily deformed during fine alignment due to lack of rigidity. Here, the longer the length of each guide in the Y direction and the smaller the length of the base in the X direction, the more easily the shim plate can deform. Because shim plates are precisely manufactured and expensive products, frequent deformation of the shim plate significantly increases the production costs of secondary batteries.

[0057] According to an exemplary embodiment, the length L2 in the Y direction of each guide 137 is within a range of approximately 4 mm to approximately 50 mm, and the distance D in the X direction between the base 131 and the first side 111S1 of the manifold 111 is within a range of 5 mm to 50 mm, thereby preventing deformation of the shim plate 130. This can improve the reliability of the die coater 100 and the economy of the coating process.

[0058] 5 is a graph illustrating the effect of the shim plate according to an exemplary embodiment. In FIG. 5, the horizontal axis represents the position in the Y direction in the coating die, and the vertical axis represents the discharge rate. The position and the discharge rate are each expressed in arbitrary units (au).

[0059] 3 and 5, it was confirmed that the discharge rate-position profile was substantially the same between the experimental example in which the length L2 of each guide 137 in the Y direction was 4 mm and the comparative example in which the length L2 of each guide in the Y direction was 150 mm. According to an exemplary embodiment, by sufficiently shortening the length L2 of each guide 137 in the Y direction, the mechanical reliability of the shim plate 130 can be improved without changing the discharge rate characteristics.

[0060] (Third embodiment) FIG. 6 is a flowchart illustrating a method for manufacturing a secondary battery according to an exemplary embodiment.

[0061] FIG. 7 is a diagram illustrating a method for manufacturing a secondary battery according to an exemplary embodiment.

[0062] 6 and 7, in P110, electrode slurry SL may be coated onto electrode plate EP. Coating of electrode slurry SL may be performed by die coater 100 described with reference to FIGS. 1 to 4. Coating of electrode slurry may be performed by a roll-to-roll method as shown in FIG. 7, but is not limited to this. For example, a stationary die coater 100 may coat electrode slurry onto an electrode plate moving on a belt, or a moving die coater 100 may coat electrode slurry onto an electrode plate on a stationary support table.

[0063] In the roll-to-roll method, the electrode slurry SL can be coated on the electrode plate EP, which is transferred and pressed by the roll RL, by the die coater 100. In this way, the sheet-like electrode EL can be provided.

[0064] Next, referring to page 120, a roll press process may be performed. The roll press process may be performed by a roll press device. The roll press device may include multiple rolls for applying pressure to the sheet-shaped electrode EL. The multiple rolls may thin and flatten the sheet-shaped electrode EL. By performing the roll press process, the bonding force between the surface of the electrode plate and the active material may be strengthened. The strengthening of the bonding force between the surface of the electrode plate and the active material may promote the movement of lithium ions between the electrode EL and the active material, thereby improving the output and performance of the final secondary battery.

[0065] The electrode EL may then be dried at P130. The drying process for the electrode EL may be performed in a drying chamber. The drying process for the electrode may be performed by supplying dry air into the drying chamber or by supplying thermal energy to the electrode EL in the chamber, such as through infrared rays and hot air. The drying process may improve the uniformity and reliability of the electrode by removing moisture from the electrode EL.

[0066] Subsequently, a slitting process may be performed in P140. The slitting process is a process of separating the electrode EL into multiple electrodes. The slitting process may be performed by a slitting device. The slitting device may include a slitting knife for dividing the electrode EL into multiple electrodes. Subsequently, the electrode may be cut into a shape including a tab by a notching process.

[0067] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations shown in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, various equivalents and modifications may exist at the time of filing this application.

Claims

1. a shim plate configured to deliver electrode slurry in a first direction; a base extending in a second direction perpendicular to the first direction; a separator connected to the base and protruding from the base in the first direction; wings connected to both ends of the base in the second direction, respectively; a guide coupled to each wing and projecting from the wing toward the separator in the second direction; The length of each guide in the second direction is within a range of 4 mm to 50 mm.

2. The shim plate according to claim 1 , wherein the length of each guide in the second direction is 20 mm or less.

3. The shim plate according to claim 1 , wherein the length of each guide in the second direction is 10 mm or less.

4. a first die including a manifold through which the electrode slurry is supplied; a shim plate disposed on the first die and including a slit as a path through which the electrode slurry is discharged; The shim plate is a base extending in a second direction perpendicular to the first direction in which the electrode slurry is discharged; a wing connected to an end of the base in the second direction; a guide connected to the wing and protruding from the wing toward the center of the base in the second direction, The base of the die coater partially covers the manifold.

5. The die coater according to claim 4 , wherein a width in the first direction of the manifold exposed from the base is within a range of 5 mm to 50 mm.

6. The die coater according to claim 5 , wherein the width of the manifold exposed from the base in the first direction is 20 mm or less.

7. The die coater according to claim 5 , wherein the width of the manifold exposed from the base in the first direction is 10 mm or less.

8. The die coater according to claim 4, wherein the length of each guide in the second direction is within a range of 4 mm to 50 mm.

9. The die coater according to claim 8 , wherein the length of each guide in the second direction is 20 mm or less.

10. The die coater according to claim 8 , wherein the length of each guide in the second direction is 10 mm or less.

11. a first die including a manifold through which the electrode slurry is supplied; a shim plate disposed on the first die and including a slit as a path through which the electrode slurry is discharged; The shim plate is a base extending in a second direction perpendicular to the first direction in which the electrode slurry is discharged; a wing connected to an end of the base in the second direction; a guide connected to the wing and protruding from the wing toward the center of the base in the second direction, A die coater, wherein the length of each guide in the second direction is within a range of 4 mm to 50 mm.

12. The die coater according to claim 11 , wherein the length of each guide in the second direction is 10 mm or less.

13. The die coater according to claim 11, wherein the length of the base in the first direction is in the range of 25 mm to 100 mm.

14. The die coater according to claim 13 , wherein the length of the base in the first direction is 50 mm or more.

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