Method for forming a three-dimensional electrode structure

Abstract

The present application can provide a method for forming a three-dimensional electrode structure for analysis, a hardware device storing the method, and a formation system for the three-dimensional electrode structure for analysis. In the present application, a method capable of effectively forming an electrode structure having excellent conformity to an actual electrode can be provided. Further, in the present application, a method capable of forming an electrode structure in which the type and volume characteristics of an actual electrode are appropriately reflected can be provided. In the present application, a method capable of simply, rapidly, and efficiently forming the electrode structure as described above can be provided.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0085868, filed on July 12, 2022, and all the contents disclosed in the corresponding Korean patent application are incorporated herein by reference in their entirety.

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

Background Art

[0003] Digital twin technology is a technology that creates a twin of a real-world object in a virtual space within a computer and predicts results by simulating situations that can occur in reality.

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

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

[0006] A secondary battery is a device that can store electrical energy by converting it into chemical energy and then generate electricity when needed, and it can be charged and discharged. With the expansion of the electric vehicle market, etc., the development of secondary batteries with excellent stability and high energy density is required, and digital twin technology can be applied in the development of such secondary batteries.

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

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

[0009] However, in the above method, since the electrode structure is formed in the same manner regardless of the type of electrode, the degree of matching with the actual electrode is poor, a structure reflecting the volume characteristics of the electrode cannot be formed, and there is a problem that the systematicness of the verification technology of the formed electrode structure is poor.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] This application can provide a method for forming a three-dimensional electrode structure for analysis, a hardware device in which the method is stored, and a formation system for the three-dimensional electrode structure for analysis.

[0012] This application can provide a method capable of effectively forming an electrode structure having excellent matching with an actual electrode.

[0013] Also, this application can provide a method capable of forming an electrode structure in which the type and volume characteristics of an actual electrode are appropriately reflected.

[0014] This application can provide a method capable of simply, quickly, and efficiently forming the above-described electrode structure.

Means for Solving the Problems

[0015] This application relates to a method for forming a three-dimensional electrode structure.

[0016] The method may include setting a specimen structure volume; forming an initial electrode structure having the formed specimen structure volume; and verifying the electrode initial structure.

[0017] The method may further include providing design parameters of the electrode sample to set the volume of the specimen structure.

[0018] In the above, the design parameters may be one or more selected from the group consisting of the type of electrode material, the content of the electrode material, the shape of the electrode material, the mechanical properties of the electrode material, the electrode loading level, the electrode density, and the dispersion rate of the material in the electrode thickness direction.

[0019] The step of setting the volume of the specimen structure may include: (1) forming a specimen electrode structure using the design parameters; and (2) setting the volume of the specimen structure through down-sizing of the specimen electrode structure.

[0020] In the above, step (2) may include checking the structural parameters of each electrode structure with reduced volume while reducing the volume of the specimen electrode structure.

[0021] In the above, the structural parameters may be one or more selected from the group consisting of the volume ratio of the conductive material, the degree of bend, and the specific surface area.

[0022] The minimum volume with an error rate of 10% or less with respect to the structural parameters of the specimen electrode structure of the structural parameters of the electrode structure with reduced volume in step (2) can be designated as the volume of the specimen structure.

[0023] In the above, the reduction of the volume of the electrode structure can be performed so that the volume becomes 0.1 times to 0.5 times the volume of the electrode structure before the volume reduction.

[0024] When forming the specimen electrode structure, the electrode material can be formed in descending order of the volume ratio in the electrode.

[0025] In the above, when forming the initial electrode structure, the electrode material can be formed in descending order of the volume ratio in the electrode.

[0026] A step of comparing the structural parameters of the initial electrode structure with the structural parameters of the electrode sample can be performed at the stage of verifying the initial electrode structure.

[0027] The structural parameter may be one or more selected from the group consisting of the effective electrical conductivity of the conductive material, the void tortuosity, and the interfacial area between the active material and the voids.

[0028] In the above, when the absolute value of the error rate between the structural parameters is 5% or more, a step of correcting the electrode structure can be further performed.

[0029] In the above, when the error rate with respect to the effective electrical conductivity of the conductive material, which is a structural parameter, is 5% or more, the contact angle between the active material and the conductive material or between the active material and the binder among the electrode materials is corrected in the 90-degree direction, and when the error rate is -5% or less, the correction can be performed in the direction of moving away from 90 degrees for the contact angle.

[0030] In the above, when the error rate with respect to the void tortuosity, which is a structural parameter, is 5% or more, the contact angle between the active material and the conductive material or between the active material and the binder among the electrode materials is decreased, and when the error rate is -5% or less, the correction can be performed in the direction of increasing the contact angle.

[0031] In the above, when the error rate with respect to the interfacial area between the active material and the voids, which is a structural parameter, is 5% or more, the contact angle between the active material and the conductive material or between the active material and the binder among the electrode materials is decreased, and when the error rate is -5% or less, the contact angle can be increased.

[0032] This application also relates to a hardware device in which the above method is stored.

Advantages of the Invention

[0033] This application can provide a method for forming a three-dimensional electrode structure for analysis, a hardware device storing the method, and a forming system for the three-dimensional electrode structure for analysis.

[0034] This application can provide a method capable of effectively forming an electrode structure with excellent conformity to an actual electrode. Further, this application can provide a method capable of forming an electrode structure in which the type and volume characteristics of an actual electrode are appropriately reflected.

[0035] This application can provide a method capable of simply, rapidly, and efficiently forming the electrode structure as described above.

Brief Description of the Drawings

[0036]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0037] This application relates to a method for forming a three-dimensional electrode structure, and specifically relates to a method for forming a three-dimensional electrode structure for analysis through Digital Twin technology.

[0038] The three-dimensional electrode structure for analysis is a twin of an actual electrode (electrode sample) embodied through Digital Twin technology, and can mean an electrode structure applicable to various simulations.

[0039] FIG. 1 is a flowchart showing a method for forming an electrode structure according to an example of the present application.

[0040] As shown in FIG. 1, the method of the present application can at least include a step of setting a representative elementary volume (REV) of a specimen structure (S100); a step of forming an electrode structure (S200); and a step of verifying the electrode structure (S300).

[0041] The term "representative elementary volume (REV)" means the minimum volume of an electrode structure that can provide measurement results representative of an actual electrode.

[0042] The representative elementary volume may also mean the volume of an electrode structure that can calculate the same calculated value as an actual electrode with a minimum of calculations.

[0043] In the present application, by first setting the representative elementary volume and then passing through a verification step after forming the electrode structure according to the set result, an electrode structure with a high degree of consistency with the actual electrode and effectively reflecting the volume characteristics of the actual electrode can be formed.

[0044] The representative elementary volume can be set based on design parameters.

[0045] The design parameters are information on the electrodes applied to form the electrode structure, meaning information on actual electrodes (hereinafter referred to as electrode samples).

[0046] Therefore, the method of the present application can further include a step of providing the design parameters or a step of obtaining the design parameters as a pre-step to the step of setting the representative elementary volume.

[0047] The design parameters may include, for example, one or more selected from the group consisting of the type of electrode material, the content of the electrode material, the shape of the electrode material, the mechanical properties of the electrode material, the electrode loading level, the electrode density, and the dispersion rate of the material in the electrode thickness direction.

[0048] The information on the type of the electrode material may include information on, for example, 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, etc. as the material for forming the electrode.

[0049] The information on the content of the electrode material may include information on the content in the electrode such as the electrode active material, the conductive material, the binder, and / or the electrolyte, etc. and the ratio of the contents to each other.

[0050] The information on the shape of the electrode material may include, as information on 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, etc. are in a particle form, information on the shape and particle size distribution of the corresponding particles, etc.

[0051] The information on the mechanical properties of the electrode material may include information on the true density or the deformation rate, the information on the electrode loading level may include information on the amount of the electrode active material (negative electrode active material or positive electrode active material) per unit area of the electrode, etc., and the information on the dispersion rate of the electrode material in the electrode thickness direction may include information on the distribution of the electrode material (active material, binder, conductive material, and / or electrolyte, etc.) in the thickness direction of the electrode.

[0052] There is no particular limitation on the method for obtaining or providing the design parameters. Such parameters can be obtained through a method by 3D Formation technology, a method by 3D Reconstruction technology, or a method combining both of the above methods.

[0053] For example, the design parameters can be provided through a method in which the user inputs relevant information considering design values and the like, a method of obtaining corresponding information from a database constructed for electrode samples, and / or an image analysis method, etc. The image analysis method is a method of obtaining design parameters through image analysis of electrode samples, and such a method is known. For example, in such a method, images obtained by a high-resolution nanoscale 3D X-ray microscope, FIB-SEM (Focused Ion Beam-Scanning Electron Microscope), and / or EDX (Energy Dispersed X-ray Spectroscopy) can be analyzed.

[0054] The information necessary for forming an initial structure using digital twin technology and the method of obtaining such information are known, and in this application, a sample electrode structure for setting the sample structure volume can be formed through such known methods.

[0055] The step of setting the sample structure volume can include: (1) a step of forming a sample electrode structure using at least one or more of the design parameters; and (2) a step of setting the sample structure volume through down-sizing of the sample electrode structure.

[0056] In step (1), the sample electrode structure can be formed by inputting the design parameters into an interface for implementing a digital twin and three-dimensionally implementing the electrode structure.

[0057] Software and hardware capable of implementing the electrode structure in the field of digital twin technology are known, and in this application, such known software and / or hardware can be used to implement the electrode structure.

[0058] In the previous step (1), the sample electrode structure is formed to have a predetermined initial volume set arbitrarily.

[0059] In the previous step (2), the process of obtaining the sample structure volume is carried out through downsizing the sample electrode structure formed to have the initial volume.

[0060] The previous step (2) can include the step of checking the structural parameters of each electrode structure with a reduced volume while reducing the volume of the sample electrode structure.

[0061] The previous step is a process of repeatedly extracting electrode structures of smaller sizes from the sample electrode structure, calculating and comparing the structural parameter values for the extracted electrode structures, and obtaining the volume (sample structure volume) that can calculate the same result value as the actual electrode with minimal calculation.

[0062] Examples of the structural parameters may include, but are not limited to, the volume ratio of the conductive material in the electrode, the degree of bending, and the specific surface area.

[0063] The step of checking the structural parameters of each electrode structure with a reduced volume while reducing the volume of the sample electrode structure in the previous step (2) can proceed until the structural parameters show an error rate of 5% or more compared to the initial value.

[0064] In the above, the initial value of the structural parameter is the value of the structural parameter for the sample electrode structure. That is, the structural parameters of the electrode structure maintain a substantially constant level as the volume of the electrode structure decreases, but when the volume of the electrode structure becomes smaller than the sample structure volume, it shows an error above a certain level compared to the initial value. Therefore, the minimum volume within a certain level of error with respect to the initial value of the structural parameter can be designated as the sample structure volume.

[0065] Specifically, the volume of the specimen structure may be specified as the minimum volume at which the structural parameter exhibits an error rate of 10% or less compared to the initial value. In one example, the volume of the specimen structure may be specified as the minimum volume at which the structural parameter exhibits an error rate of 9% or less, 8% or less, 7% or less, 6% or less, or 5% or less compared to the initial value. There is no special limitation on the lower limit of the error rate applied to the minimum volume specification. In one example, the error rate may be about 0% or more, 1% or more, 2% or more, 3% or more, 4% or more, or 5% or more. In one example, the volume of the specimen structure is the minimum volume at which at least one of the volume ratio, degree of bending, and specific surface area of the conductive material, which are the structural parameters, exhibits an error rate within the above range, or the minimum volume of the electrode structure in which the volume ratio, degree of bending, and specific surface area of the conductive material, which are the structural parameters, all exhibit an error rate within the above range.

[0066] In the above, the error rate is the absolute value of △P, which is calculated by the following formula 1.

[0067] [Formula 1] ΔP = 100×(Pf - Pi) / Pi

[0068] In Formula 1, Pi is the initial value of the structural parameter (for example, the initial value of the volume ratio, degree of bending, or specific surface area of the conductive material), and Pf is the structural parameter of the electrode structure whose volume has been reduced (for example, the volume ratio, degree of bending, or specific surface area of the conductive material of the electrode structure with the reduced volume).

[0069] There is no special limitation on the volume (initial volume) of the specimen electrode structure set in the above process, and an appropriate volume considering the volume of the electrode sample may be specified.

[0070] For example, the volume of the specimen electrode structure may be a volume having an arbitrary thickness while the structure is about 400 μm in both the horizontal and vertical directions. The thickness of the structure may be specified as an appropriate numerical value in consideration of the size of the electrode actually applied and the efficiency of the method of the present application.

[0071] In addition, there are no special restrictions on the method of reducing the volume (initial volume) of the specimen electrode structure set in the above process, and the volume may be gradually reduced at a certain ratio with respect to the initial volume. For example, the reduction of the volume may be performed such that the volume of the electrode structure after the reduction is approximately 0.1 to 0.5 times the volume of the electrode structure before the reduction. The ratio of the volume may be, in other examples, about 0.15 times or more, 0.2 times or more, or 0.25 times or more, or may 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.

[0072] The above process will be described with reference to the example in FIG. 2 as follows.

[0073] The leftmost electrode structure in FIG. 2 is a specimen electrode structure embodied by digital twin technology and has an arbitrarily set initial volume (in the case of FIG. 2, a volume of 400 μm × 400 μm × electrode thickness μm).

[0074] For the embodiment of the specimen electrode structure, the electrode material is three-dimensionally illustrated in a virtual space according to the information of the design parameters. In the present application, in this process, the electrode materials can be three-dimensionally illustrated in the virtual space in descending order of the volume occupied in the electrode. There are differences in the types of materials forming the electrodes depending on the types of electrodes, and there are also differences in the ratios of the volumes occupied by the respective electrode materials in each electrode. Conventionally, such differences have not been considered, and the electrode structure has been embodied by illustrating the electrode materials in an arbitrary order. However, in the present application, the electrode materials can be illustrated in descending order of the volume occupied in the electrode among the electrode materials.

[0075] According to such a method, the order of embodying the electrode structure will vary depending on the type of electrode. For example, when the electrode to be embodied is an electrode for a lithium-ion battery / lithium-sulfur battery, as shown in FIG. 3, the electrode structure is formed by a method in which the electrode active material is first formed and then the conductive material and the binder are formed (CASE 1). When it is an electrode for an all-solid-state battery, the electrode structure is formed in the order of the electrode active material, the solid electrolyte, and the conductive material / binder (CASE 2). When it is an electrode for a lithium-air battery, the electrode structure is formed in the order of the void layer, the catalyst particles, and the conductive material / binder (CASE 3).

[0076] By forming the electrode structure in such a way that the electrode materials are formed in the order of decreasing ratio according to the volume ratio of the electrode materials in the electrode, the ratio of the error to the measured value for the actual electrode can be minimized.

[0077] In downscaling, as shown in FIG. 2, a structure of a specific size smaller than the sample electrode structure is repeatedly extracted from the sample electrode structure. In FIG. 2, the structure is extracted while repeatedly reducing the horizontal and vertical lengths (400 μm) of the sample electrode structure by one-fourth each time.

[0078] For each of the electrode structures repeatedly extracted through the above process to obtain the sample structure volume, a structural parameter value is calculated.

[0079] The structural parameter is a parameter related to the performance of the battery that can be derived from the electrode structure, and examples thereof include the volume ratio of the conductive substance, the degree of tortuosity, and / or the specific surface area as described above.

[0080] The method of calculating the structural parameters using the electrode structure is well-known. For example, the volume fraction (ε) and tortuosity (τ) of the conductive material can be calculated by a method of calculating the effective electrical conductivity (σeff) of the electrode structure. The effective electrical conductivity is the charge conduction characteristic that can actually be exhibited by the electrode calculated in consideration of the volume fraction (ε) and tortuosity (τ) of the conductive material, and this is expressed by the formula σ eff =(ε / τ 2 )×σ (in the above formula, σ eff is the effective electrical conductivity, ε is the volume fraction of the conductive material, τ is the tortuosity, and σ is the intrinsic conductivity of the conductive material). Therefore, the volume fraction and tortuosity can be confirmed through the calculation of the effective electrical conductivity.

[0081] The effective electrical conductivity can be calculated, for example, as exemplarily shown in FIG. 4, by applying the continuity equation of Ohm's law as the governing equation and applying the Dirichlet boundary condition under the assumption that a voltage difference of 1V is maintained constant on the coaxial and opposing surfaces.

[0082] The volume fraction and tortuosity can also be calculated by another method, which is to quantify the number and shape of voxels, which are the smallest units constituting the structure.

[0083] Also, the specific surface area as the structural parameter is the value obtained by dividing the surface area of the electrode material per unit volume or the interface area between different materials by the volume of the electrode, and such a parameter can also be calculated by a method of quantifying the number and / or shape of the voxels.

[0084] Among the software known to be able to embody digital twin technology, there is an algorithm through which the parameters can be confirmed by quantifying the number and shape of voxels as described above. In this application, the parameters and the like can be confirmed through such an algorithm.

[0085] As described above, the specimen structure volume can be designated as the volume immediately before the error rate with respect to the initial value of the corresponding structural parameter starts to exceed a certain level while repeating the process of confirming the structural parameter. The graph shown in the lower right part of Figure 2 is the result of determining the specimen structure volume through such a process. In the example of Figure 2, the specimen structure volume is designated to be approximately 6.25×10 4 μm 3 or so.

[0086] In the method of this application, after determining the specimen structure volume by the above method, the step of forming an electrode structure (hereinafter referred to as the initial electrode structure) having the corresponding specimen structure volume is performed.

[0087] The method of performing the step of forming the initial electrode structure can be formed in substantially the same manner as the method of forming the specimen electrode structure in step (1) except that the electrode structure is formed to have the specimen structure volume.

[0088] Based on the provided design parameters, an electrode structure having the specimen structure volume can be formed and used as the initial electrode structure.

[0089] Even in this process, similar to the formation of the sample electrode structure, the electrode structure can be formed by three-dimensionally illustrating the electrode materials in a virtual space in descending order of the volume occupied in the electrode, and through this, the advantages as described above can be ensured. Therefore, for example, when the electrode to be embodied is an electrode for a lithium-ion battery / lithium-sulfur battery, as shown in FIG. 3, the electrode structure is formed by forming the electrode active material first and then forming the conductive material and the binder. When it is an electrode for an all-solid-state battery, the electrode structure is formed in the order of the electrode active material, the solid electrolyte, and the conductive material / binder. When it is an electrode for a lithium-air battery, the electrode structure can be formed in the order of the void layer, the catalyst particles, and the conductive material / binder.

[0090] In the method of the present application, after forming the initial electrode structure, a step of verifying the initial electrode structure can be performed.

[0091] Such a step can include a step of comparing the structural parameters of the initial electrode structure with the structural parameters of the electrode sample (actual electrode).

[0092] The structural parameters to be confirmed in the above process can be any one, two, or all three of the effective electrical conductivity of the conductive substance, the void tortuosity, and the interfacial area between the active material and the voids.

[0093] In the above, the void tortuosity is a concept included in the tortuosity among the structural parameters confirmed for the electrode structure repeatedly extracted to obtain the volume of the sample structure, and the interfacial area between the active material and the voids is a concept included in the specific surface area among the structural parameters confirmed for the electrode structure repeatedly extracted to obtain the volume of the sample structure.

[0094] The void tortuosity and the interfacial area between the active material and the voids can be obtained by known methods, and can be obtained according to the methods for obtaining the tortuosity and the specific surface area among the structural parameters confirmed for the electrode structure repeatedly extracted to obtain the volume of the sample structure, respectively.

[0095] The effective electrical conductivity can be calculated, for example, as exemplified in FIG. 4, by applying the continuity equation of Ohm's law as the governing equation and applying the Dirichlet boundary condition under the assumption that a voltage difference of 1 V is maintained constant on the coaxial and opposing surfaces.

[0096] A method for obtaining the structural parameters in the initial electrode structure embodied by digital twin technology and in an actual electrode sample is known, and such a known method can be applied in this application.

[0097] When the error rate 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 initial structure can be designated as the final electrode structure.

[0098] In the above, the error rate is ΔV, which is calculated by Equation 2 below.

[0099] [Equation 2] ΔV = 100×(V R - V I ) / V R

[0100] In Equation 2, V I is the structural parameter of the initial electrode structure (for example, the effective electrical conductivity, void tortuosity, or active material-void interface area), and V R is the structural parameter of the electrode sample (actual electrode) (for example, the effective electrical conductivity, void tortuosity, or active material-void interface area).

[0101] The process can be carried out until the error rate is, for example, in the range of about -5% to 5% or in the range of -3% to 3%.

[0102] That is, when the error rate between the structural parameters of the initial electrode structure and the structural parameters of the electrode sample (actual electrode) is within the range of -3% to 3% or within the range of -5% to 5%, the corresponding initial electrode structure can be designated as the final electrode structure.

[0103] For example, when at least one of the effective electrical conductivity, void tortuosity, and the interfacial area between the active material and the voids, which are the structural parameters, shows an error rate within the above range, the corresponding initial structure can be designated as the final structure. In another example, an initial electrode structure in which all of the effective electrical conductivity, void tortuosity, and the interfacial area between the active material and the voids, which are the structural parameters, show an error rate within the above range can be designated as the final electrode structure.

[0104] When at least one or two or more or all of the effective electrical conductivity, void tortuosity, and the interfacial area between the active material and the voids, which are the structural parameters, show an error rate exceeding the above-mentioned range, the correction stage of the electrode structure can proceed.

[0105] The correction stage of such an electrode structure can be carried out by correcting the connection shape between the materials in the electrode structure and the shapes of the conductive material and the binder. The correction can be carried out, for example, as shown in FIG. 5, by correcting the shapes of the conductive material and the binder so that the contact angle between the active material and the conductive material / binder among the electrode materials is controlled.

[0106] The method of performing the correction for each structural parameter is not particularly limited.

[0107] For example, in the case of the effective electrical conductivity of the conductive substance, if the error rate confirmed by the above method 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 among the electrode materials is corrected in the 90-degree direction, and if the error rate is -3% or less or -5% or less, the contact angle can be corrected in a direction away from 90 degrees.

[0108] Correcting the contact angle in the 90-degree direction as described above means performing the correction so that the contact angle approaches 90 degrees. Therefore, if by any chance the contact angle is less than 90 degrees, the correction is made so that the contact angle increases, and if it is more than 90 degrees, the correction is performed so that the contact angle decreases. At this time, the degree of angle correction is not particularly limited. For example, the correction can be performed so that the contact angle increases or decreases by 5 degrees each time. The method of performing the above-described correction by utilizing digital twin technology is known.

[0109] Correcting the contact angle in the direction away from 90 degrees as described above means performing the correction so that the contact angle moves away from 90 degrees. Therefore, if by any chance the contact angle is less than 90 degrees, the correction is made so that the contact angle decreases, and if it is more than 90 degrees, the correction is performed so that the contact angle increases. At this time, the degree of angle correction is not particularly limited. For example, the correction can be performed so that the contact angle increases or decreases by 5 degrees each time. The method of performing the above-described correction by utilizing digital twin technology is known.

[0110] On the other hand, when the error rate with respect to the void tortuosity, which is a structural parameter as described above, 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 among the electrode materials is decreased, and when the error rate is -3% or less or -5% or less, the correction is performed in the direction of increasing the contact angle. Also in this process, the degree of angle correction is not particularly limited. For example, the correction can be performed so that the contact angle increases or decreases by 5 degrees each time. The method of performing the above-described correction by utilizing digital twin technology is known.

[0111] Also, when the error rate with respect to the interfacial area between the active material, which is a structural parameter, and the voids in the above process 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 among the electrode materials is decreased. When the error rate is -3% or less or -5% or less, the correction can be performed in the direction of increasing the contact angle. The degree of correcting the angle is not particularly limited in this process. For example, the correction can be performed so that the contact angle increases or decreases by 5 degrees at a time. A method of performing the above correction by utilizing digital twin technology is known.

[0112] After going through the above correction process, the structure verification process is advanced again. As a result, when the error rate is within the above-mentioned certain level, the corresponding structure can be set as the target final structure.

[0113] This application also relates to a hardware device in which the method for forming the electrode structure is stored.

[0114] Also, this application relates to an electrode structure forming system in which the above hardware device is used.

[0115] The system can further include a device for collecting the design parameters applied in the method for forming the electrode structure. There are no special restrictions on the type of such a device. For example, a specimen preparation device for cutting an electrode sample and fabricating it with a plurality of specimens and / or an image device for photographing an image of the electrode sample and / or the specimen can be exemplified.

Claims

1. A method for forming a three-dimensional electrode structure, comprising: setting a sample structure volume; forming an initial electrode structure having the set sample structure volume; and verifying the initial electrode structure. A method comprising the above steps.

2. The method according to claim 1, further comprising providing design parameters of an electrode sample to set 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 content of the electrode material, the shape of the electrode material, the mechanical properties of the electrode material, the electrode loading level, the electrode density, and the dispersion rate of the material in the electrode thickness direction.

4. The step of setting the sample structure volume includes: (1) forming a sample electrode structure using design parameters; and (2) setting the sample structure volume through downsizing of the sample electrode structure. The method according to claim 1, including the above steps.

5. The method according to claim 4, wherein the step (2) includes checking the structural parameters of each electrode structure with reduced volume while reducing the volume of the sample electrode structure.

6. The method according to claim 5, wherein the structural parameters are one or more selected from the group consisting of the volume ratio of the conductive material, the degree of bending, and the specific surface area.

7. The method according to claim 5, wherein the sample structure volume is specified as the minimum volume at which the error rate of the structural parameters of the electrode structure with reduced volume in the step (2) with respect to the structural parameters of the sample electrode structure is 10% or less.

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

9. The method according to claim 4, wherein the electrode materials are formed in descending order of volume ratio in the electrode during the formation of the sample electrode structure.

10. The method according to claim 1, wherein the electrode materials are formed in descending order of volume ratio in the electrode during the formation of the initial electrode structure.

11. The method according to claim 1, wherein in the step of verifying the initial electrode structure, the structural parameters of the initial electrode structure are compared with the structural parameters of the electrode sample.

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

13. The method according to claim 12, further comprising the step of correcting the electrode structure when the absolute value of the error rate between the structural parameters is 5% or more.

14. When the error rate with respect to the effective electrical conductivity of the conductive material, which is the structural parameter, is 5% or more, the contact angle between the active material and the conductive material or between the active material and the binder in the electrode material is corrected in the 90-degree direction. When the error rate is -5% or less, the contact angle is corrected in a direction away from 90 degrees. The method according to claim 13.

15. When the error rate with respect to the void tortuosity, which is the structural parameter, is 5% or more, the contact angle between the active material and the conductive material or between the active material and the binder in the electrode material is decreased. When the error rate is -5% or less, the contact angle is increased. The method according to claim 13.

16. When the error rate with respect to the interfacial area between the active material and the voids, which is the structural parameter, is 5% or more, the contact angle is decreased. When the error rate is -5% or less, the contact angle is increased. The method according to claim 14.

17. A hardware device in which the method according to any one of claims 1 to 16 is stored.

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