CN117916574A - Method for predicting occurrence of electrode cracking and delamination - Google Patents
Method for predicting occurrence of electrode cracking and delamination Download PDFInfo
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- CN117916574A CN117916574A CN202380013233.2A CN202380013233A CN117916574A CN 117916574 A CN117916574 A CN 117916574A CN 202380013233 A CN202380013233 A CN 202380013233A CN 117916574 A CN117916574 A CN 117916574A
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- 230000032798 delamination Effects 0.000 title claims abstract description 88
- 238000005336 cracking Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000007373 indentation Methods 0.000 claims description 67
- 238000005259 measurement Methods 0.000 claims description 55
- 239000011267 electrode slurry Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 239000011149 active material Substances 0.000 claims description 5
- 239000006258 conductive agent Substances 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 7
- 239000002003 electrode paste Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
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- 238000001704 evaporation Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Abstract
The invention relates to a method for predicting occurrence of electrode cracks and delamination, and aims to provide a method for predicting occurrence of electrode cracks and delamination, which comprises the following steps: measuring crack force of the dry electrode; and predicting occurrence of cracking and delamination of the electrode based on the measured crack force.
Description
Technical Field
The present application claims priority from korean patent application No.10-2022-0047900, filed on 19 of 2022, 4, and korean patent application No.10-2023-0017429, filed on 9 of 2023, 2, and the entire disclosures of which are incorporated herein by reference.
The present invention relates to a method of predicting occurrence of electrode cracking and delamination, and in particular, to a method of predicting occurrence of electrode cracking and delamination including measuring crack forces of a dry electrode and predicting occurrence of cracking and delamination of the electrode based on the measured crack forces.
Background
The manufacturing method of an electrode for a secondary battery may include a mixing process of mixing an active material with a conductive material, a binder, and a solvent to form an electrode paste, a coating process of applying the electrode paste onto a current collector, a drying process of drying the applied electrode paste, and a dividing process of cutting the battery to meet designed battery specifications.
Here, defects such as cracks and delamination may occur due to stress generated by drying and during the process of dividing the electrode in the electrode manufacturing method.
Cracks (cracks) may be generated due to the stress generated by the drying. There is a difference in thermal contraction or expansion behavior between the foil and the paste when the electrode is dried. Therefore, excessive heat is applied to the electrode dried by evaporation of the internal solvent, and the electrode may develop wrinkles and cracks like cracks on the dried land.
Delamination (delamination) means that the electrode at the punched portion falls off the foil like debris during punching of the electrode directly by the knife.
In order to prevent the occurrence of the above-mentioned phenomenon, the adhesion of the electrode paste is generally measured, but it is difficult to predict the above-mentioned defective phenomenon 100% using the adhesion. In particular, the adhesion may be used as an indicator of the attractive force between the foil and the electrode. However, there is a limit in using the adhesion force to explain the cohesive force (coating cohesive force) between particles in the electrode, and thus a new index is required.
Disclosure of Invention
Technical problem
The present invention relates to a method of predicting occurrence of electrode cracking and delamination and provides a method of predicting occurrence of electrode cracking and delamination comprising measuring crack forces of a dry electrode and predicting occurrence of cracking and delamination of the electrode based on the measured crack forces.
The technical problems to be achieved by the present invention are not limited to the above-described technical problems, and other technical problems not mentioned will be apparent to those skilled in the art from the following description.
Solution to the problem
The method for predicting occurrence of electrode cracking and delamination of the present invention may include:
a step of preparing an electrode to be analyzed by applying an electrode slurry to one surface of an electrode current collector and then drying;
A step of press-fitting an electrode to be analyzed, wherein a measuring point is press-fitted into the surface of the electrode to be analyzed;
collecting data to be analyzed, namely collecting indentation load values applied to measurement points of the electrodes to be analyzed for each indentation depth value of the measurement points;
Extracting crack force, namely extracting an indentation load value when an electrode to be analyzed breaks as a crack force value; and
And a predicting step of predicting occurrence of cracks and delamination of the electrode to be analyzed using the crack force value.
ADVANTAGEOUS EFFECTS OF INVENTION
The method for predicting occurrence of electrode cracks and delamination according to the present invention can provide data for reducing defects in an electrode manufacturing process by predicting occurrence probability of cracks and delamination of an electrode.
The method for predicting occurrence of electrode cracking and delamination according to the present invention can accurately express the characteristics of cohesion between particles in an electrode.
Drawings
Fig. 1 is a block diagram illustrating a method for predicting the occurrence of cracks and delamination of an electrode according to the present invention.
Fig. 2 is a cross-sectional view showing a cross section of an electrode to be analyzed prepared in the step of preparing the electrode to be analyzed.
Fig. 3a is a front view showing the measurement point.
Fig. 3b is a side view showing the measurement point.
Fig. 4 is a cross-sectional view showing that the measurement point is press-fitted into the electrode to be analyzed.
Fig. 5 is a graph showing indentation load as a function of indentation depth.
Detailed Description
The method for predicting occurrence of electrode cracking and delamination of the present invention may include:
a step of preparing an electrode to be analyzed by applying an electrode slurry to one surface of an electrode current collector and then drying;
A step of press-fitting an electrode to be analyzed, wherein a measuring point is press-fitted into the surface of the electrode to be analyzed;
collecting data to be analyzed, namely collecting indentation load values applied to measurement points of the electrodes to be analyzed for each indentation depth value of the measurement points;
Extracting crack force, namely extracting an indentation load value when an electrode to be analyzed breaks as a crack force value; and
And a predicting step of predicting occurrence of cracks and delamination of the electrode to be analyzed using the crack force value.
In the step of preparing an electrode to be analyzed of the method for predicting occurrence of electrode cracking and delamination of the present invention, the electrode current collector may be made of a metal foil, and the electrode slurry may be prepared by mixing an active material, a conductive agent, a binder, and a solvent.
In the press-fitting of the electrode to be analyzed of the method for predicting occurrence of electrode cracking and delamination of the present invention, one end of the measurement point may be an edge formed by the first plane and the second plane intersecting each other at an acute angle, and the measurement point may be press-fitted into the electrode to be analyzed while the edge of the measurement point is brought into contact with one surface of the electrode to be analyzed.
In the method for predicting occurrence of electrode cracking and delamination of the present invention, the length of the edge formed by the first plane and the second plane may be 2 to 10mm, and the angle formed by the first plane and the second plane may be 15 to 45 degrees.
In the method for predicting occurrence of electrode cracking and delamination of the present invention, the measurement point may be moved in a direction perpendicular to one surface of the electrode to be analyzed and press-fitted into the one surface of the electrode to be analyzed, and the measurement point may be moved at a speed of 50 μm/s or less.
In the step of extracting the crack force of the method for predicting occurrence of electrode cracking and delamination of the present invention, the crack force value may be an indentation load value when the indentation load value has a maximum value with respect to the indentation depth value.
In the prediction step of the method for predicting occurrence of electrode cracking and delamination of the present invention, it is possible to predict that the smaller the crack force value is, the greater the probability of occurrence of cracking or delamination in the electrode to be analyzed.
In the predicting step of the method for predicting occurrence of cracking and delamination of an electrode of the present invention, an indentation depth value when an indentation load value is a crack force value may be considered together with the crack force value in predicting occurrence of cracking or delamination of an electrode to be analyzed.
In the prediction step of the method for predicting occurrence of cracking and delamination of an electrode of the present invention, it is predicted that the smaller the indentation depth value when the indentation load value is a crack force value, the greater the probability of occurrence of cracking or delamination in the electrode to be analyzed.
In the predicting step of the method for predicting occurrence of cracking and delamination of an electrode of the present invention, the strain energy value may be calculated by integrating the indentation load value until the indentation depth value when the indentation load value is the crack force value, and occurrence of cracking and delamination of an electrode to be analyzed may be predicted based on the strain energy value.
In the prediction step of the method for predicting occurrence of cracking and delamination of an electrode of the present invention, the smaller the strain energy value, the greater the probability of occurrence of cracking or delamination in the electrode to be analyzed can be predicted.
The method for predicting occurrence of electrode cracking and delamination of the present invention may further include, before the step of preparing the electrode to be analyzed:
A step of preparing a standard electrode by applying a standard electrode slurry to one surface of an electrode current collector and then drying;
A step of press-fitting the standard electrode, wherein the measuring point is press-fitted into the surface of the standard electrode;
Collecting reference data, namely collecting indentation load values applied to measurement points of the standard electrode for each indentation depth value of the measurement points; and
Extracting a reference force, namely extracting an indentation load value when the standard electrode breaks as a reference force value;
Wherein in the predicting step, the crack force value and the reference force value may be used to predict occurrence of cracks and delamination of the electrode to be analyzed.
In the predicting step of the method for predicting occurrence of cracking and delamination of an electrode of the present invention, when the crack force value is 70% or less of the reference force value, the electrode to be analyzed may be predicted as an electrode where cracking and delamination are to occur.
Mode for carrying out the invention
Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. Furthermore, the terms specifically defined in consideration of the configuration and operation of the present invention may vary according to the intention or habit of a user or operator. These terms should be defined based on the contents in the present specification.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", "one surface", "other surface", and the like are based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship generally arranged when the product of the present invention is used. It is used solely for the explanation and brief description of the present invention and should not be construed as a limitation of the present invention, as it does not suggest or imply that the indicated device or element must be configured or operated in the specified orientation.
FIG. 1 is a block diagram illustrating a method of the present invention for predicting the occurrence of electrode cracking and delamination. Fig. 2 is a cross-sectional view showing a cross section of an electrode to be analyzed prepared in the step of preparing the electrode to be analyzed. Fig. 3a is a front view showing the measurement point. Fig. 3b is a side view showing the measurement point. Fig. 4 is a cross-sectional view showing that the measurement point is press-fitted into the electrode to be analyzed. Fig. 5 is a graph plotting indentation load as a function of indentation depth.
Hereinafter, the method for predicting occurrence of electrode cracks and delamination according to the present invention will be described in detail with reference to fig. 1 to 5.
The method for predicting occurrence of electrode cracks and delamination of the present invention is for predicting probability of occurrence of cracks or delamination of an electrode during manufacturing of the electrode, wherein crack force described later can be used as an index.
As shown in fig. 1, a method for predicting occurrence of electrode cracking and delamination may include:
a step of preparing an electrode to be analyzed (S10) by applying an electrode slurry to one surface of the electrode current collector 11 and then drying;
A step of press-fitting an electrode to be analyzed (S20), in which the measurement point 100 is press-fitted into the surface of the electrode to be analyzed 10;
A step (S30) of collecting data to be analyzed, in which an indentation load value applied to the measurement point 100 is collected for each indentation depth value of the measurement point 100 of the electrode 10 to be analyzed;
A step (S40) of extracting a crack force, wherein an indentation load value at the time of fracture of the electrode 10 to be analyzed is extracted as a crack force value; and
And a predicting step (S50) of predicting occurrence of cracks and delamination of the electrode 10 to be analyzed using the crack force value.
In the step of preparing an electrode to be analyzed (S10), the electrode current collector 11 may be made of a metal foil, and the electrode slurry may be prepared by mixing an active material, a conductive agent, a binder, and a solvent.
Specifically, in the step of preparing an electrode to be analyzed (S10), the electrode to be analyzed 10 may be prepared by performing a step prior to a segmentation process in a general electrode manufacturing process. For example, the electrode 10 to be analyzed may be prepared by performing a mixing process, a coating process of applying an electrode paste onto a current collector, a pressing process of pressing an electrode, and a drying process of drying the applied electrode paste. The electrodes to be analyzed 10 may include, but are not limited to, positive electrodes and negative electrodes. However, since the positive electrode and the negative electrode have different physical properties from each other, in the subsequent step of press-fitting the electrode to be analyzed (S20) or the like, measurement can be performed under different conditions.
As shown in fig. 2, the electrode to be analyzed 10 may be formed by drying an electrode slurry applied to one surface of the electrode current collector 11.
In the step of press-fitting the electrode to be analyzed (S20), one end of the measurement point 100 is formed as a sharp point (cusp), and one end of the measurement point 100 formed as a sharp point may be inserted into the electrode surface by a force.
Specifically, as shown in fig. 3a and 3b, one end of the measurement point 100 may be an edge 130 formed by the first plane 110 and the second plane 120 intersecting each other at an acute angle. That is, the sharp point of the measurement point 100 may be set as an edge 130 formed by the intersection of two planes.
The measuring point 100 may be press-fitted into the electrode 10 to be analyzed while the edge 130 of the measuring point 100 is brought into contact with one surface of the electrode 10 to be analyzed. More specifically, the measurement point 100 and the electrode 10 to be analyzed are aligned such that the direction of the edge 130 of the measurement point 100 is parallel to one surface of the electrode 10 to be analyzed, the measurement point 100 can be moved to approach the electrode 10 to be analyzed, and the measurement point 100 can be press-fitted into the electrode 10 to be analyzed.
As shown in fig. 3a, the length D of the edge 130 formed by the first and second planes 110 and 120 may be 2 to 10 millimeters, and as shown in fig. 3b, the angle a formed by the first and second planes 110 and 120 may be 15 to 45 degrees. The length of the edge 130 and the angle between the two planes take into account the sensitivity of the crack forces as described below to be detected when inserting the measurement point 100 and are determined by taking into account the material or state of the electrode 10 to be analyzed. For example, when the electrode to be analyzed 10 is formed as a negative electrode, the length D of the edge 130 may be 6 mm, and when the electrode to be analyzed 10 is formed as a positive electrode, may be 3 mm. For example, the angle a formed by the first plane 110 and the second plane 120 may be 32 degrees.
As shown in fig. 4, the measurement point 100 may be moved in a direction perpendicular to one surface of the electrode 10 to be analyzed and press-fitted into one surface of the electrode 10 to be analyzed. Specifically, the measurement point 100 may be moved in a direction perpendicular to the edge 130 of the measurement point 100 and one surface of the electrode 10 to be analyzed, and press-fitted into the electrode 10 to be analyzed. That is, in fig. 4, the measurement point 100 may be moved in the vertical direction.
The measurement point 100 may be moved at a speed of 50 μm/s or less. The measurement point 100 may be press-fitted into one surface of the electrode 10 while moving at a constant speed. Therefore, since the speed is constant, the indentation load depends on the state (normal state, broken state, etc.) of the electrode 10 to be analyzed at the time of press fitting, and thus can be collected and used as analysis data. The speed of the measurement point 100 may be selected for the negative electrode in the range where the indentation load is kept at 20gf or less, or may be selected for the positive electrode in the range where the indentation load is kept at 40gf or less. For example, the measurement point 100 may be moved at a speed of 10 μm/s.
In the step of collecting data to be analyzed (S30), the distance that the measurement point 100 moves in the direction perpendicular to one surface of the electrode to be analyzed 10 is defined as the indentation depth. The indentation load value of the indentation depth that varies when the measurement point 100 moves may be collected. The indentation load value may be a load value applied to the measurement point 100 in a direction perpendicular to one surface of the electrode 10 to be analyzed when the measurement point 100 moves.
As shown in fig. 5, in the step of extracting the crack force (S40), when the indentation load value has a maximum value with respect to the indentation depth value, the crack force value may be the indentation load value. As the measurement point 100 is press-fitted into the electrode, an increasingly greater indentation load is applied to the measurement point 100. When the electrode 10 to be analyzed is completely broken, the indentation load applied to the measurement point 100 is partially released. As shown in fig. 5, there is a maximum value, which can be determined as a crack force value.
In the predicting step (S50), it is possible to predict that the smaller the strain energy value is, the greater the possibility of cracking or delamination of the electrode to be analyzed is. In the method for predicting occurrence of electrode cracking and delamination of the present invention, the crack force is a value related to inter-particle attractive force inside the electrode, the stronger the inter-particle attractive force, the longer the electrode can withstand insertion of the measurement point 100, and the electrode having the stronger inter-particle attractive force may have a larger crack force value. Thus, since cracking or delamination is less likely to occur in an electrode having strong inter-particle attractive force, it can be predicted that the smaller the crack force value, the greater the likelihood of cracking or delamination occurring in the electrode 10 to be analyzed.
In the predicting step (S50), an indentation depth value when the indentation load value is a crack force value may be considered together with the crack force value to predict occurrence of cracking or delamination of the electrode 10 to be analyzed. As shown in fig. 5, it can be seen that the electrode with greater interparticle attraction without delamination breaks at deeper indentation depths.
Therefore, in the predicting step (S50), it is predicted that the smaller the indentation depth value when the indentation load value is the crack force value, the greater the probability of occurrence of cracks or delamination in the electrode 10 to be analyzed.
In the predicting step (S50), the strain energy value may be calculated by integrating the indentation load value until an indentation depth value when the indentation load value is a crack force value. The strain energy value may be the area of the shaded area in the graph shown in fig. 5. In the method for predicting electrode cracking and delamination of the present invention, occurrence of cracking and delamination of the electrode 10 to be analyzed can be predicted based on the strain energy value.
Specifically, in the predicting step (S50), the smaller the strain energy value, the greater the possibility of occurrence of cracks or delamination in the electrode 10 to be analyzed can be predicted.
The method for predicting occurrence of electrode cracking and delamination of the present invention may further include:
prior to step S10 of preparing the electrode to be analyzed,
A step of preparing a standard electrode by applying a standard electrode slurry to one surface of an electrode current collector and then drying;
A step of press-fitting the standard electrode, wherein the measuring point is press-fitted into the surface of the standard electrode;
Collecting reference data, namely collecting indentation load values applied to measurement points of the standard electrode for each indentation depth value of the measurement points; and
And extracting a reference force, namely extracting an indentation load value when the standard electrode breaks as a reference force value.
The standard electrode is a defect-free electrode that does not develop cracks or delaminates, and the state of the electrode 10 to be analyzed can be determined based on the measured value of the standard electrode.
Specifically, in the predicting step (S50) of the method for predicting occurrence of crack and delamination of an electrode of the present invention, the crack force value and the reference force value may be used to predict occurrence of crack and delamination of the electrode 10 to be analyzed.
In the step of preparing the standard electrode, the standard electrode is a defect-free electrode that does not have delamination that occurs. Specifically, when a specific physical condition is applied to an electrode having a certain thickness by completing rolling, the standard electrode may not be separated from the current collector, and may not be damaged such as a crack. For example, under physical conditions, an electrode that is not separated from the current collector when a force is applied to the electrode during an electrode dividing process or the like is applied to the electrode, and that is free from damage such as cracks may be used as a standard electrode.
In one embodiment, the standard electrode slurry may be the same electrode slurry used to prepare the electrode 10 to be analyzed. The physical properties of the finished electrode may be determined according to manufacturing conditions such as applied thickness, drying time, drying temperature, and pressing strength during the electrode manufacturing process, and the preparation of the standard electrode slurry is similar to that of the electrode 10 to be analyzed. However, the manufacturing conditions of the standard electrode may be set at different manufacturing conditions from those of the electrode 10 to be analyzed.
In another embodiment, the standard electrode slurry may have a different composition ratio with the conductive agent, binder, active material, and solvent of the electrode slurry of the electrode 10 to be analyzed, or have a different composition material itself.
In the predicting step, the electrode to be analyzed may be predicted as an electrode where cracking and delamination are to occur when the crack force value is 70% or less of the reference force value.
Example
Electrode slurries of 6 different binder contents were prepared and the corresponding slurries were coated, dried and pressed to prepare two samples of 12 total electrodes 10 to be analyzed.
A measuring point 100 having a indenter (indenter) with a diameter of 3 to 6pi and an angle a formed by two planes at 30 degrees was press-fitted into the electrode 10 to be analyzed at a speed of 10 μm/s, and a crack force was calculated from the indentation depth and indentation load value measured during press-fitting.
Table 1 below shows the calculated crack forces for six types of electrodes A, B, C, A ', B ' and C '.
TABLE 1
It can be seen that the electrodes of the sample group with delamination have crack force values 30% to 70% lower than the electrodes of the sample group without delamination. In table 1, the crack forces are in N.
While embodiments of the invention have been described above, these are illustrative only, and various modifications and equivalent embodiments are possible, as will be understood by those skilled in the art. Therefore, the true technical scope of the present invention should be defined by the following claims.
Description of the reference numerals
Electrode to be analyzed
Current collector
Measurement points
First plane
Second plane
Industrial applicability
The method for predicting occurrence of electrode cracks and delamination according to the present invention can provide data for reducing defects in an electrode manufacturing process by predicting occurrence probability of cracks and delamination of an electrode.
The method for predicting occurrence of electrode cracking and delamination according to the present invention can accurately represent the characteristics of cohesion between particles in an electrode.
Claims (13)
1. A method of predicting occurrence of electrode cracking and delamination comprising:
A step of preparing an electrode to be analyzed, which is prepared by applying an electrode slurry to one surface of an electrode current collector and then drying;
a step of press-fitting an electrode to be analyzed, wherein a measuring point is press-fitted into the surface of the electrode to be analyzed;
a step of collecting data to be analyzed, in which an indentation load value applied to the measurement point is collected for each indentation depth value of the measurement point of the electrode to be analyzed;
Extracting crack force, namely extracting an indentation load value when the electrode to be analyzed breaks as a crack force value; and
And predicting occurrence of cracks and delamination of the electrode to be analyzed by using the crack force value.
2. The method for predicting occurrence of electrode cracking and delamination according to claim 1, wherein, in the step of preparing the electrode to be analyzed,
The electrode current collector is made of a metal foil, and
The electrode slurry is prepared by mixing an active material, a conductive agent, a binder, and a solvent.
3. The method for predicting occurrence of electrode cracking and delamination according to claim 1, wherein, in the step of press-fitting the electrode to be analyzed,
One end of the measuring point is an edge formed by the first plane and the second plane intersecting each other at an acute angle, and
The measuring point is press-fitted into the electrode to be analyzed while bringing an edge of the measuring point into contact with the one surface of the electrode to be analyzed.
4. The method for predicting the occurrence of electrode cracking and delamination of claim 3, wherein
The length of the edge formed by the first plane and the second plane is 2 mm to 10 mm, and
The angle formed by the first plane and the second plane is 15 degrees to 45 degrees.
5. The method for predicting the onset of electrode cracking and delamination of claim 4, wherein
The measuring point moves in a direction perpendicular to the one surface of the electrode to be analyzed and is press-fitted into the one surface of the electrode to be analyzed, and
The measurement point moves at a speed of 50 μm/s or less.
6. The method for predicting the occurrence of electrode cracking and delamination according to claim 1, wherein, in the step of extracting crack force,
The crack force value is an indentation load value when the indentation load value has a maximum value with respect to an indentation depth value.
7. The method for predicting occurrence of electrode cracking and delamination according to claim 1, wherein, in the predicting step,
The smaller the crack force value is predicted, the greater the probability of crack or delamination occurring in the electrode to be analyzed.
8. The method for predicting occurrence of electrode cracking and delamination according to claim 1, wherein, in the predicting step,
In predicting occurrence of cracking or delamination of the electrode to be analyzed, an indentation depth value when the indentation load value is the crack force value is considered together with the crack force value.
9. The method for predicting occurrence of electrode cracking and delamination according to claim 8, wherein, in the predicting step,
The smaller the indentation depth value is predicted when the indentation load value is the crack force value, the greater the probability of occurrence of cracks or delamination in the electrode to be analyzed.
10. The method for predicting occurrence of electrode cracking and delamination according to claim 8, wherein, in the predicting step,
Calculating a strain energy value by integrating the indentation load value until the indentation depth value when the indentation load value is the crack force value, and
Predicting occurrence of cracks and delamination of the electrode to be analyzed based on the strain energy value.
11. The method for predicting occurrence of electrode cracking and delamination according to claim 10, wherein, in the predicting step,
The smaller the strain energy value is predicted, the greater the probability of crack or delamination occurring in the electrode to be analyzed.
12. The method of predicting the occurrence of electrode cracking and delamination of claim 1 wherein prior to the step of preparing the electrode to be analyzed further comprises:
A step of preparing a standard electrode by applying a standard electrode slurry to one surface of an electrode current collector and then drying;
A step of press-fitting the standard electrode, in which a measurement point is press-fitted into the surface of the standard electrode;
A step of collecting reference data, for each indentation depth value of the measurement point of the standard electrode, collecting an indentation load value applied to the measurement point; and
Extracting a reference force, namely extracting an indentation load value when the standard electrode breaks as a reference force value;
wherein in the predicting step, occurrence of cracking and delamination of the electrode to be analyzed is predicted using the crack force value and the reference force value.
13. The method of predicting the occurrence of electrode cracking and delamination of claim 12 wherein, in said predicting step,
When the crack force value is 70% or less of the reference force value, the electrode to be analyzed is predicted as an electrode where cracking and delamination are to occur.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0047900 | 2022-04-19 | ||
| KR10-2023-0017429 | 2023-02-09 | ||
| KR1020230017429A KR20230149214A (en) | 2022-04-19 | 2023-02-09 | Prediction method for cracking and delamination of electrodes |
| PCT/KR2023/003059 WO2023204440A1 (en) | 2022-04-19 | 2023-03-07 | Method for predicting occurrence of electrode crack and delamination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117916574A true CN117916574A (en) | 2024-04-19 |
Family
ID=90695075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202380013233.2A Pending CN117916574A (en) | 2022-04-19 | 2023-03-07 | Method for predicting occurrence of electrode cracking and delamination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117916574A (en) |
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2023
- 2023-03-07 CN CN202380013233.2A patent/CN117916574A/en active Pending
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