Method of forming three-dimensional electrode structure

Abstract

The present application may provide a method of forming a three-dimensional electrode structure for analysis, a hardware device storing the method, and a system of forming a three-dimensional electrode structure for analysis. The present application can provide a method for effectively forming an electrode structure having an excellent degree of matching with an actual electrode. In addition, the present application can provide a method for forming an electrode structure that appropriately reflects the type and volume characteristics of an actual electrode. The invention can provide a method for simply, quickly and efficiently forming the electrode structure.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0085868 filed on Jul. 12, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present application relates to a method for forming a three-dimensional electrode structure, a hardware device storing the method, and a system for forming a three-dimensional electrode structure for analysis. Background Art

[0003] Digital twin technology is a technology that creates a twin of a real object in a virtual space within a computer and simulates situations that can occur in reality to predict outcomes.

[0004] This digital twin technology can be applied in various fields.

[0005] For example, digital twin technology can be used in the research and development of secondary batteries.

[0006] Secondary batteries are devices that can be charged and discharged, and can generate electricity when necessary after electrical energy is converted into chemical energy and stored. As the electric vehicle market expands, the development of secondary batteries with excellent stability and capable of achieving high energy density is required, and digital twin technology can be applied to the development of such secondary batteries.

[0007] For example, Patent Document 1 discloses a method for modeling a three-dimensional electrode structure using digital twin technology.

[0008] In the method disclosed in Patent Document 1, an electrode structure is formed by combining a so-called three-dimensional forming technique (3D forming) and a three-dimensional reconstruction technique (3D reconstruction).

[0009] However, in the above method, the electrode structure is formed in the same way regardless of the type of electrode, which results in problems such as reduced matching with the actual electrode, failure to form a structure reflecting the volume characteristics of the electrode, and low systematicity of the verification technology of the formed electrode structure.

[0010] [Prior art literature]

[0011] [Patent Document 1]

[0012] (Patent Document 1) Korean Patent Publication No. 10-2021-0063821 Summary of the invention

[0013] Technical issues

[0014] The present application may provide a method for forming a three-dimensional electrode structure for analysis, a hardware device storing the method, and a system for forming a three-dimensional electrode structure for analysis.

[0015] The present application can provide a method for effectively forming an electrode structure that has an excellent degree of matching with an actual electrode. In addition, the present application can provide a method for forming an electrode structure that appropriately reflects the type and volume characteristics of the actual electrode. The present application can provide a method for simply, quickly and efficiently forming such an electrode structure.

[0016] Technical Solution

[0017] The present application relates to a method for forming a three-dimensional electrode structure.

[0018] The method may include the following steps: setting a sample structure volume; forming an initial electrode structure having the formed sample structure volume; and verifying the initial electrode structure.

[0019] The method may further comprise the step of providing design parameters of the electrode sample to set the sample structure volume.

[0020] Here, the design parameters may be one or more selected from the group consisting of electrode material type, electrode material content, electrode material shape, electrode material mechanical properties, electrode loading level, electrode density and material distribution rate along electrode thickness direction.

[0021] The step of setting the sample structure volume may include the following steps: (1) forming a sample electrode structure using the design parameters; and (2) setting the sample electrode structure volume by reducing the size of the sample electrode structure.

[0022] Here, step (2) may include the step of reducing the volume of the sample electrode structure and confirming the structural parameters of each electrode structure whose volume has been reduced.

[0023] Here, the structural parameter may be one or more selected from the group consisting of a curvature, a specific surface area, and a volume ratio of the conductive material.

[0024] The minimum volume in which the error ratio between the structural parameters of the electrode structure whose volume has been reduced in step (2) and the structural parameters of the sample electrode structure is 10% or less can be designated as the sample structure volume.

[0025] Here, the volume reduction of the electrode structure may be performed such that the volume is 0.1 to 0.5 times the volume of the electrode structure before the volume reduction.

[0026] When forming the sample electrode structure, the electrode materials may be formed in order of largest volume ratio in the electrode.

[0027] Here, when forming the preliminary electrode structure, electrode materials may be formed in order of largest volume ratio in the electrode.

[0028] In the step of verifying the initial electrode structure, a step of comparing structural parameters of the initial electrode structure with structural parameters of an electrode sample may be performed.

[0029] The structural parameter may be one or more selected from the group consisting of void tortuosity, an interface area between the active material and the void, and an effective conductivity of the conductive material.

[0030] Here, when the absolute value of the error ratio between the structural parameters is 5% or more, the step of correcting the electrode structure may be further performed.

[0031] Here, when the error ratio of the effective conductivity of the conductive material as the structural parameter is 5% or greater, the contact angle between the active material in the electrode material and the conductive material or the active material and the binder can be corrected in the 90 degree direction, and when the error ratio is -5% or less, the contact angle can be corrected in the direction away from 90 degrees.

[0032] Here, when the error ratio of the gap curvature as the structural parameter is 5% or greater, the contact angle between the active material and the conductive material in the electrode material or between the active material and the binder can be reduced, and when the error ratio is -5% or less, correction in the direction of increasing the contact angle can be performed.

[0033] Here, when the error ratio of the interface area between the active material and the void as the structural parameter is 5% or greater, the contact angle between the active material and the conductive material in the electrode material or between the active material and the binder can be reduced, and when the error ratio is -5% or less, the contact angle can be increased.

[0034] The present application also relates to a hardware device for storing the method.

[0035] Beneficial Effects

[0036] The present application can provide a method for forming a three-dimensional electrode structure for analysis, a hardware device for storing the method, and a system for forming a three-dimensional electrode structure for analysis. The present application can provide a method for effectively forming an electrode structure with an excellent degree of matching with an actual electrode. In addition, the present application can provide a method for forming an electrode structure that appropriately reflects the type and volume characteristics of the actual electrode. The present application can provide a method for simply, quickly and efficiently forming such an electrode structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a flow chart showing the processing of the method of the present application.

[0038] Figure 2 is a schematic diagram illustrating a process of obtaining a sample structure volume.

[0039] Figure 3 2 is a diagram showing the procedure for forming an electrode structure.

[0040] Figure 4 It is a diagram for explaining a process for obtaining effective conductivity.

[0041] Figure 5 is a schematic diagram illustrating a process of correcting an electrode structure using a contact angle. DETAILED DESCRIPTION

[0042] The present application relates to a method of forming a three-dimensional electrode structure, and in particular, to a method of forming and analyzing a three-dimensional electrode structure using digital twin technology.

[0043] The analyzed three-dimensional electrode structure is a twin of the actual electrode (electrode sample) realized by the digital twin technology, which can mean an electrode structure suitable for various simulations.

[0044] Figure 1 is a flowchart illustrating a method of forming an electrode structure according to an example of the present application.

[0045] like Figure 1 As shown in , the method of the present application may include at least the following steps: setting a sample structure volume (REV: representative elementary volume) (S100); forming an electrode structure (S200); and verifying the electrode structure (S300).

[0046] The term sample structure volume (REV) means the minimum volume of an electrode structure that can provide measurements that are representative of an actual electrode. The sample structure volume can also mean the volume of an electrode structure that can calculate the same calculated values ​​as an actual electrode with minimal calculations.

[0047] The present application first sets the sample structure volume and forms an electrode structure according to the setting result, and then, through a verification step, can form an electrode structure that has a high degree of matching with the actual electrode and effectively reflects the volume characteristics of the actual electrode.

[0048] The sample structure volume may be set based on design parameters. The design parameters are information related to electrodes applied to form the electrode structure, which means information related to actual electrodes (hereinafter, referred to as electrode samples).

[0049] Therefore, the method of the present application may further include the step of providing design parameters or obtaining design parameters as a prior step to the step of setting the sample structure volume.

[0050] The design parameters may be exemplified by one or more selected from the group consisting of type of electrode material, content of electrode material, shape of electrode material, mechanical properties of electrode material, electrode loading level, electrode density and distribution ratio of material along electrode thickness direction.

[0051] The information about the type of electrode material may include, for example, information related to the type of electrode active material such as a positive electrode active material or a negative electrode active material, the type of conductive material, the type of binder, the type of electrolyte, the type of current collector and / or the type of separator as the material forming the electrode.

[0052] The information on the content of the electrode material may include information on the content of the electrode active material, the conductive material, the binder and / or the electrolyte in the electrode or the content ratio thereof.

[0053] In the information related to the shape of the electrode material, for example, when the materials constituting the electrode active material, the conductive material, the binder and / or the electrolyte are in the form of particles, information related to the shape or particle size distribution of the relevant particles can be included as the information related to the shape of the electrode material.

[0054] The information related to the mechanical properties of the electrode material may include information related to the true density or deformation ratio; the information related to the electrode loading level may include information related to the amount of electrode active material (negative electrode active material or positive electrode active material) per unit area of ​​the electrode; and the information related to the distribution rate of the electrode material along the thickness direction of the electrode may include information related to the distribution of the electrode material (active material, binder, conductive material and / or electrolyte, etc.) along the thickness direction of the electrode, etc.

[0055] The method of obtaining or providing the design parameters is not particularly limited. Such parameters can be obtained by a method based on a three-dimensional forming technique (3D forming), a method based on a three-dimensional reconstruction technique (3D reconstruction), or a method combining these two methods.

[0056] For example, the design parameters can be provided by a method in which the user inputs relevant information in consideration of design values, etc., a method in which relevant information is retrieved from a database constructed for an electrode sample, and / or an image analysis method. The image analysis method is a method in which the design parameters are obtained by image analysis of an electrode sample, and this method is known. For example, in the above method, an image obtained by a high-resolution nanoscale 3D X-ray microscope, a FIB-SEM (focused ion beam scanning electron microscope), and / or an EDX (energy dispersive X-ray spectroscopy) can be analyzed.

[0057] In the digital twin technology, the information necessary to form the initial structure and the method for obtaining the information are known, wherein in the present application, a sample electrode structure for setting the sample structure volume can be formed by this known method.

[0058] The step of setting the sample structure volume may include the steps of: (1) forming the sample electrode structure using at least one of the design parameters, and (2) setting the sample electrode structure volume by reducing the size of the sample electrode structure.

[0059] In step (1), a sample electrode structure may be formed by inputting design parameters into an interface for implementing a digital twin to implement a method of three-dimensionally implementing the electrode structure.

[0060] In the field of digital twin technology, software or hardware capable of implementing an electrode structure is known, and in the present application, the electrode structure can be implemented using such known software and / or hardware.

[0061] In step (1), a sample electrode structure is formed to have a predetermined initial volume that is arbitrarily set.

[0062] In step (2), a process of obtaining the volume of the sample electrode structure is performed by reducing the size of the sample electrode structure formed to have the initial volume.

[0063] Step (2) may include the step of reducing the volume of the sample electrode structures while confirming the structural parameters of each electrode structure whose volume has been reduced.

[0064] The above steps are a process of repeatedly extracting smaller-sized electrode structures from the sample electrode structure, calculating the structural parameter values ​​of the extracted electrode structures, and comparing them to obtain a volume (sample structure volume) that can calculate the same result value as the actual electrode with minimal calculations.

[0065] The structural parameters can be exemplified by the curvature, specific surface area and volume ratio of the conductive material in the electrode, but are not limited thereto.

[0066] In step (2), the steps of reducing the volume of the sample electrode structure and simultaneously confirming the structural parameters of each electrode structure whose volume has been reduced may be performed until the structural parameters show an error ratio of 5% or more relative to the initial value.

[0067] Here, the initial value of the structural parameter is the value of the structural parameter of the sample electrode structure. That is, the structural parameter of the electrode structure is maintained at a substantially constant level in the process of reducing the volume of the electrode structure, but when the volume of the electrode structure becomes smaller than the sample structure volume, it indicates an error higher than a certain level relative to the initial value. Therefore, the minimum volume within a certain level of error relative to the initial value of the structural parameter can be specified as the sample structure volume.

[0068] Specifically, the sample structure volume can be specified as the minimum volume at which the structural parameter exhibits an error ratio of 10% or less relative to the initial value. In one example, the sample structure volume can be specified as the minimum volume at which the structural parameter exhibits an error ratio of 9% or less, 8% or less, 7% or less, 6% or less, or 5% or less relative to the initial value. The lower limit of the error ratio applied to the minimum volume specification is not particularly limited, and in one example, the error ratio may also be 0% or greater, 1% or greater, 2% or greater, 3% or greater, 4% or greater, or 5% or greater. In one example, the sample structure volume may be the minimum volume at which at least one of the curvature, specific surface area, and volume ratio of the conductive material as a structural parameter exhibits an error ratio within the range relative to the initial value, or may be the minimum volume of the electrode structure at which all curvatures, specific surface areas, and volume ratios of the conductive material as structural parameters exhibit error ratios within the range.

[0069] Here, the error ratio is the absolute value of ΔP to be calculated by the following Equation 1.

[0070] [Formula 1]

[0071] ΔP=100×(Pf-Pi) / Pi

[0072] In Formula 1, Pi is the initial value of the structural parameter (e.g., the initial value of the curvature, specific surface area, or volume ratio of the conductive material), and Pf is the structural parameter of the volume-reduced electrode structure (e.g., the curvature, specific surface area, or volume ratio of the conductive material in the volume-reduced electrode structure).

[0073] The volume (initial volume) of the sample electrode structure set in the above process is not particularly limited, wherein the volume of the electrode sample can be considered to specify an appropriate volume. For example, the volume of the sample electrode structure can be a volume having an arbitrary thickness while the width and length are both about 400 μm. The thickness of the structure can be specified as an appropriate value, taking into account the electrode size of actual application or the efficiency of the method of the present application, etc.

[0074] In addition, the method of reducing the volume (initial volume) of the sample electrode structure set in the above process is not particularly limited, and the volume can be gradually reduced at a constant rate relative to the initial volume. For example, the volume reduction can be performed so that the volume reduction of the rear electrode structure is approximately 0.1 to 0.5 times the volume reduction of the front electrode structure. In another example, the volume ratio can be about 0.15 times or more, 0.2 times or more, or 0.25 times or more, or it can also be about 0.45 times or less, 0.4 times or less, 0.35 times or less, 0.3 times or less, or 0.25 times or less.

[0075] The following references Figure 2 The example in illustrates the above processing.

[0076] Figure 2 The electrode structure on the far left is a sample electrode structure realized by digital twin technology, which has an arbitrarily set initial volume (in Figure 2 In the case of , the volume of the electrode structure is 400μm×400μm×electrode thickness μm).

[0077] To realize the sample electrode structure, the electrode material is three-dimensionally depicted in the virtual space according to the design parameter information. In the present application, the electrode materials in the process can be three-dimensionally depicted in the virtual space in the order of the large volume occupied in the electrode. Depending on the type of electrode, the type of material forming the electrode is different, and the ratio of the volume occupied by each electrode material in each electrode is also different. Conventionally, the electrode structure is realized by depicting the electrode materials in an arbitrary order without considering these differences, but in the present application, the electrode materials can be depicted in the order of the large volume occupied in the electrode.

[0078] According to the method, the order of realizing the electrode structure varies depending on the electrode type. For example, if the electrode to be realized is an electrode for a lithium-ion battery / lithium-sulfur battery, the electrode structure is formed by first forming an electrode active material and then forming a conductive material and a binder (case 1); in the case of an electrode for an all-solid-state battery, the electrode structure is formed in the order of an electrode active material, a solid electrolyte, and a conductive material / binder (case 2); and in the case of an electrode for a lithium-air battery, the electrode structure is formed in the order of a void layer, catalyst particles, and a conductive material / binder (case 3).

[0079] In this manner, by forming the electrode structure in such a manner that the electrode materials are formed in the order of a large ratio depending on the volume ratio of the electrode materials in the electrode, the error ratio from the measured value of the actual electrode can be minimized.

[0080] When reducing the size, such as Figure 2As shown in , structures with a specific size smaller than the sample electrode structure are repeatedly extracted. Figure 2 In the process, the structure is extracted while repeatedly reducing the horizontal and vertical lengths (400 μm) of the sample electrode structure by 1 / 4.

[0081] In order to obtain the sample structure volume, the structure parameter values ​​are calculated for the corresponding electrode structures repeatedly extracted through the above process.

[0082] The structural parameter is a parameter related to battery performance that can be derived from the electrode structure, and examples thereof include the tortuosity, specific surface area and / or volume ratio of the conductive material as described above, and the like.

[0083] The calculation method of the structural parameters in the known electrode structure. For example, the effective conductivity (σ eff ) method to calculate the volume ratio (volume fraction ε) and connection curvature (τ) of the conductive material. The effective conductivity is the charge conduction characteristic that can actually be represented in the electrode. It is calculated by considering the volume ratio (volume fraction ε) and curvature (τ) of the conductive material. It is calculated by the equation σ eff =(ε / τ 2 )×σ(In the above equation, σ eff is the effective conductivity, ε is the volume ratio of the conductive material, τ is the tortuosity, and σ is the intrinsic conductivity of the conductive material), so that the volume ratio and tortuosity can be determined by calculating the effective conductivity.

[0084] For example, the effective conductivity can be calculated by applying the continuity equation of Ohm's law as the governing equation and applying the method of the Dirichlet boundary condition under the assumption that the voltage difference 1V between the sides concentrically facing each other is kept constant, as in Figure 4 As shown in the example.

[0085] As another approach, volume ratios and connection curvatures can also be calculated by quantifying the number and shape of voxels, which are the smallest units constituting a structure.

[0086] In addition, the specific surface area as a structural parameter is the surface area of ​​the electrode material per volume of material, or a value obtained by dividing the interface area between heterogeneous materials by the electrode volume, and such a parameter can also be calculated by a method of quantifying the number and / or shape of voxels.

[0087] In software known to implement digital twin technology, there is an algorithm that can confirm parameters by quantifying the number or shape of voxels as described above, and in the present application, parameters, etc. can be confirmed by such an algorithm.

[0088] As described above, the sample structure volume may be specified as a volume just before a time point at which an error ratio of an initial value of a relevant structure parameter starts to exceed a certain level when the process of confirming the structure parameter is repeated. Figure 2 The graph shown in the lower right part is the result of determining the volume of the sample structure through such processing, and Figure 2 In the example, the sample structure volume is specified to be approximately 6.25×10 4 μm 3 about.

[0089] In the method of the present application, the sample structure volume is determined by the above method, and then a step of forming an electrode structure having the relevant sample structure volume (hereinafter, the initial electrode structure) is performed.

[0090] In the method of performing the step of forming an initial electrode structure, the electrode structure may be formed substantially in the same method as the method of forming a sample electrode structure in step (1), except that it is formed to have a sample structure volume.

[0091] By forming an electrode structure having a sample structure volume based on the provided design parameters, this can be used as an initial electrode structure.

[0092] In this process, like the formation of the sample electrode structure, the electrode structure can be formed by three-dimensionally depicting the electrode material in the virtual space in the order of the large volume occupied in the electrode, and accordingly, the advantages as described above can be ensured. Therefore, for example, if the electrode to be implemented is an electrode for a lithium-ion battery / lithium-sulfur battery, the electrode structure can be formed by a method of first forming an electrode active material and then forming a conductive material and a binder; in the case of an electrode for an all-solid-state battery, the electrode structure can be formed in the order of electrode active material, solid electrolyte, and conductive material / binder; and in the case of an electrode for a lithium-air battery, the electrode structure can be formed in the order of a void layer, catalyst particles, and conductive material / binder, such as Figure 3 as shown in .

[0093] In the method of the present application, after the initial electrode structure is formed, a step of verifying the initial electrode structure may be performed.

[0094] Such a step may include the step of comparing the structural parameters of the initial electrode structure with the structural parameters of the electrode sample (actual electrode).

[0095] The structural parameters determined in the above process may be any one, two or all three of the void tortuosity, the interfacial area between the active material and the void, and the effective conductivity of the conductive material.

[0096] Here, the void tortuosity is a concept included in the tortuosity among the structural parameters confirmed for the electrode structure repeatedly extracted to obtain the sample structure volume, and the interface area between the active material and the void is a concept included in the specific surface area among the structural parameters confirmed for the electrode structure repeatedly extracted to obtain the sample structure volume.

[0097] The void tortuosity and the interface area between the active material and the void can be obtained by a known method, and can each be obtained according to a method of obtaining tortuosity and specific surface area among structural parameters confirmed for an electrode structure repeatedly extracted to obtain a sample structure volume.

[0098] For example, the effective conductivity can be calculated by applying the continuity equation of Ohm's law as the governing equation and applying the method of the Dirichlet boundary condition assuming that the voltage difference 1V between the sides concentrically facing each other is kept constant, as in Figure 4 As shown in the example.

[0099] The method of obtaining the initial electrode structure implemented by the digital twin technology and the structural parameters in the actual electrode sample is known, and this known method can be applied in the present application.

[0100] If the error ratio between the structural parameters of the initial electrode structure and the structural parameters of the electrode sample (actual electrode) is below a certain level, the relevant initial structure may be designated as the final electrode structure.

[0101] Here, the error ratio is ΔV to be calculated by the following Equation 2.

[0102] [Formula 2]

[0103] ΔV=100×(V R -V I ) / V R

[0104] In Formula 2, V I is a structural parameter of the initial electrode structure (e.g., effective conductivity, void tortuosity, or interfacial area between active material and void), and V R is a structural parameter of the electrode sample (actual electrode) (e.g., effective conductivity, void tortuosity, or interfacial area between active material and void).

[0105] This process may be performed until the error ratio is, for example, in the range of about -5% to 5% or in the range of -3% to 3%. That is, if the error ratio between the structural parameters of the initial electrode structure and the structural parameters of the electrode sample (actual electrode) is in the range of -3% to 3% or in the range of -5% to 5%, the initial electrode structure may be designated as the final electrode structure.

[0106] For example, if at least one of the effective conductivity, void tortuosity, and interface area between the active material and the void as structural parameters exhibits an error ratio within the above range, the relevant initial structure can be designated as the final structure, and in another example, an initial electrode structure in which all of the effective conductivity, void tortuosity, and interface area between the active material and the void as structural parameters exhibit error ratios within the above range can be designated as the final electrode structure.

[0107] If at least one, two or more, or all of the effective conductivity, void tortuosity, and interfacial area between the active material and the void as structural parameters show an error ratio exceeding the above range, a correction step of the electrode structure may be performed.

[0108] This correction step of the electrode structure can be performed by correcting the connection shape between the materials in the electrode structure and the shape of the conductive material and the binder. Figure 5 As shown in , correction can be performed by modifying the shapes of the conductive material and the binder so that the contact angle between the active material among the electrode materials and the conductive material / binder is controlled.

[0109] The method of performing correction on each structural parameter is not particularly limited.

[0110] For example, in the case of the effective conductivity of the conductive material, if the error ratio confirmed by the above method is 3% or greater or 5% or greater, the contact angle between the active material and the conductive material in the electrode material or the contact angle between the active material and the binder can be corrected in the 90 degree direction, and if the error ratio is -3% or less or -5% or less, the contact angle can be corrected in a direction away from 90 degrees.

[0111] Here, the case where the contact angle is corrected in the 90 degree direction means that the correction is performed so that the contact angle is close to 90 degrees. Therefore, if the contact angle is less than 90 degrees, the correction is performed to make the contact angle larger, and if the contact angle is greater than 90 degrees, the correction is performed to make the contact angle smaller. In this case, the degree to which the angle is corrected is not particularly limited, and for example, the correction can be performed so that the contact angle increases or decreases by 5 degrees. Methods for performing the above corrections using digital twin technology are known.

[0112] Here, the case where the contact angle is corrected in a direction away from 90 degrees means that the correction is performed so that the contact angle is away from 90 degrees. Therefore, if the contact angle is less than 90 degrees, the correction is performed to make the contact angle smaller, and if the contact angle is greater than 90 degrees, the correction is performed to make the contact angle larger. In this case, the degree to which the angle is corrected is not particularly limited, and for example, the correction can be performed so that the contact angle increases or decreases by 5 degrees. Methods for performing the above corrections using digital twin technology are known.

[0113] In addition, if the error ratio of the void curvature as the above structural parameter is 3% or more or 5% or more, the contact angle between the active material and the conductive material or the contact angle between the active material and the binder in the electrode material is reduced, and if the error ratio is -3% or less or -5% or less, a correction is performed in the direction of increasing the contact angle. In this process, the degree to which the angle is corrected is not particularly limited, and, for example, the correction can be performed so that the contact angle increases or decreases by 5 degrees. A method for performing the above correction using digital twin technology is known.

[0114] In addition, in the above process, if the error ratio of the interface area between the active material and the void as a structural parameter is 3% or more or 5% or more, the contact angle between the active material and the conductive material in the electrode material or the contact angle between the active material and the binder can be reduced, and if the error ratio is -3% or less or -5% or less, a correction can be performed in the direction of increasing the contact angle. In this process, the degree to which the angle is corrected is not particularly limited, and, for example, a correction can be performed so that the contact angle increases or decreases by 5 degrees. A method for performing the above correction using digital twin technology is known.

[0115] If the structure verification process is performed again after the above correction process, and the error ratio is within the above-mentioned certain level, the relevant structure can be set as the desired final structure.

[0116] The present application also relates to a hardware device storing a method of forming an electrode structure.

[0117] In addition, the present application relates to an electrode structure forming system using a hardware device.

[0118] The system may also include a device for collecting design parameters applied in the method of forming the electrode structure. The type of such a device is not particularly limited, and this may be exemplified by a sample manufacturing device for cutting an electrode sample to produce a plurality of samples and / or an imaging device for taking images of an electrode sample and / or a specimen, etc.

Claims

1. A method for forming a three-dimensional electrode structure, the method comprising the following steps: Confirm the volume of sample structure; forming an initial electrode structure having the sample structure volume; as well as The initial electrode structure is verified. 2 . The method according to claim 1 , further comprising providing design parameters of an electrode sample to confirm the sample structure volume.

3. The method according to claim 2, wherein: The design parameters are one or more selected from the group consisting of the type of electrode material, the amount of electrode material, the shape of electrode material, the mechanical properties of electrode material, electrode loading level, electrode density and distribution rate of material along the electrode thickness direction.

4. The method according to claim 1, wherein: The confirmation of the sample structure volume includes: (1) forming a sample electrode structure using design parameters; and (2) confirming the sample electrode structure volume by reducing the size of the sample electrode structure.

5. The method according to claim 4, wherein: (2) The confirmation of the volume of the sample electrode structure includes reducing the volume of the sample electrode structure and confirming the structural parameters of each electrode structure whose volume has been reduced.

6. The method according to claim 5, wherein: The structural parameter is one or more selected from the group consisting of tortuosity, specific surface area, and volume ratio of the conductive material.

7. The method according to claim 5, wherein: The minimum volume in which the error ratio between the structural parameters of the electrode structure whose volume has been reduced in step (2) and the structural parameters of the sample electrode structure is 10% or less is designated as the sample structure volume.

8. The method according to claim 5, wherein: The volume reduction of the electrode structure is performed such that the volume is 0.1 to 0.5 times the volume of the electrode structure before the volume reduction.

9. The method according to claim 4, wherein: When forming the sample electrode structure, electrode materials are formed in order of largest volume ratio in the electrode.

10. The method according to claim 1, wherein: When forming the initial electrode structure, electrode materials are formed in order of largest volume ratio in the electrode.

11. The method according to claim 1, wherein: In the step of verifying the initial electrode structure, a step of comparing structural parameters of the initial electrode structure with structural parameters of an electrode sample is performed.

12. The method according to claim 11, wherein: The structural parameter is one or more selected from the group consisting of void tortuosity, interface area between the active material and the void, and effective conductivity of the conductive material.

13. The method according to claim 12, wherein: When the absolute value of the error ratio between the structural parameters is 5% or more, a step of correcting the electrode structure is further performed.

14. The method according to claim 13, wherein: When the error ratio of the effective conductivity of the conductive material as a structural parameter is 5% or greater, the contact angle between the active material in the electrode material and the conductive material or between the active material and the binder is corrected in the 90 degree direction, and when the error ratio is -5% or less, the contact angle is corrected in the direction away from 90 degrees.

15. The method according to claim 13, wherein: When the error ratio of the void curvature as the structural parameter is 5% or greater, the contact angle between the active material and the conductive material or between the active material and the binder in the electrode material decreases, and when the error ratio is -5% or less, the contact angle increases.

16. The method according to claim 14, wherein: When the error ratio of the interface area between the active material and the void as the structural parameter is 5% or greater, the contact angle between the active material and the conductive material in the electrode material or between the active material and the binder decreases, and when the error ratio is -5% or less, the contact angle increases.

17. A hardware device storing the method according to any one of claims 1 to 16.

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