Active material particle crushing and crushing degree evaluation method and device, electronic equipment and storage medium
By evaluating the degree of breakage of active materials through particle size testing and sample breakage index R, the problem of difficulty in evaluating the breakage of positive and negative electrode materials in batteries in existing technologies is solved, and accurate assessment and optimization of the degree of breakage are achieved, providing data support for improving battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LISHEN (QINGDAO) NEW ENERGY CO LTD
- Filing Date
- 2025-12-11
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies are insufficient to effectively assess the degree of breakage of the positive and negative electrode active materials in batteries, leading to decreased battery performance and increased safety hazards.
The particle size distribution curve is obtained by particle size testing. The degree of breakage of the active material is evaluated by combining the sample breakage index R and divided into three levels: light, medium and heavy. The breakage index R is calculated by using the peak point position of the particle size distribution curve and the minimum particle size offset rate.
It enables accurate evaluation of the degree of breakage of active materials, reduces the influence of subjective factors, is applicable to a variety of active materials, improves evaluation efficiency and quality, and provides reliable data support.
Smart Images
Figure CN121830401A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and in particular to a method, apparatus, electronic device, and storage medium for evaluating the crushing and degree of crushing of active material particles. Background Technology
[0002] The breakage of active material particles in the positive and negative electrodes of a battery has multifaceted impacts on battery performance. First, severe breakage leads to the loss of active material, directly affecting the battery's energy storage capacity. Reduced active material means lower energy density, thus decreasing battery range. Second, broken electrodes may increase the battery's internal resistance, reducing charge and discharge efficiency. Increased internal resistance not only causes voltage drops during discharge but also makes charging more difficult, further impacting battery lifespan. Furthermore, breakage of active materials can trigger internal short circuits. A short circuit generates significant heat, potentially leading to overheating or even thermal runaway, damaging the battery structure and potentially causing safety incidents. Moreover, short circuits accelerate battery performance degradation, further shortening battery lifespan.
[0003] Therefore, the significant breakage of the positive and negative electrode active materials in a battery can negatively impact various aspects, including energy density, charge / discharge efficiency, safety, and lifespan. Finding a method to evaluate the degree of breakage and subsequently select the optimal solution is therefore crucial. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings and defects of the prior art and to provide a method, apparatus, electronic device and storage medium for evaluating the crushing and degree of crushing of active material particles.
[0005] To achieve the above objectives, this application adopts the following solution:
[0006] A method for evaluating the breakage of active material particles, specifically including the following steps:
[0007] Step 1: Prepare reference sample electrodes and test sample electrodes of the same system;
[0008] Step 2: Pre-treat the electrode sheets to be tested and the reference electrode sheets by scraping off powder, soaking, and filtering to remove the binder components;
[0009] Step 3: Perform particle size testing on the reference sample and the sample to be tested obtained in step 2 to obtain the particle size distribution curve;
[0010] Step 4: Determine whether the peak position of the particle size distribution curve of the sample to be tested has shifted towards smaller particles compared with the reference sample. If the shift has occurred, it is determined that breakage has occurred.
[0011] The present invention also includes a method for evaluating the degree of breakage of active material particles, comprising the aforementioned method for evaluating the breakage of active material particles, wherein when breakage is determined to have occurred, the degree of breakage is evaluated using a sample breakage index R, where R = N × V × 100%; N is the minimum particle size peak position shift rate of the test sample compared with the reference sample; and V is the volume percentage of particles smaller than the minimum particle size of the reference sample in the test sample.
[0012] N=(d0-d x ) / d0×100%, where d0 is the smallest particle size in the reference sample, d x The minimum particle size of the sample to be tested.
[0013] The larger the value of R, the more severe the breakage; the smaller the value of R, the less severe the breakage.
[0014] Based on the R value, the degree of fragmentation is divided into three levels: light, moderate, and severe; light is defined as R < 0.02%, moderate as 0.02% ≤ R ≤ 0.05%, and severe as R > 0.05%.
[0015] The reference sample electrode mentioned in the first step is an electrode sample that has not undergone rolling or recycling.
[0016] The solution used for soaking in the second step is a solvent for dissolving the adhesive; the solvent is NMR, DMF or DMSO, and the soaking temperature is 50℃~80℃.
[0017] The present invention also includes a device for evaluating the crushing of active material particles and the degree of crushing, the device comprising:
[0018] The information acquisition module is used to acquire the particle size test parameters of the electrode sheet to be tested and the reference electrode sheet, including the position of the peak point of the particle size distribution curve, or the minimum particle size in the sample to be tested and the reference sample, and the volume ratio of particles smaller than the minimum particle size value in the sample to be tested.
[0019] The analysis module analyzes the data from the information acquisition module;
[0020] The judgment module determines the breakage and degree of breakage of the active material particles based on the results of the analysis module.
[0021] The present invention also includes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the program, implements the fracture evaluation method or the fracture degree evaluation method.
[0022] The present invention also includes a storage medium storing a computer program thereon, which, when executed by a processor, implements the method for evaluating the breakage or the method for evaluating the degree of breakage.
[0023] Compared with the prior art, the beneficial effects of this application are as follows:
[0024] This application proposes a novel method for evaluating the degree of particle breakage in active materials through particle size testing. First, the peak position of the particle size distribution curve is used to determine whether significant breakage has occurred. Then, combined with the mathematical formula output by the sample breakage index R, the breakage index is calculated using the minimum particle size peak shift rate between the tested sample and the reference sample, as well as the volume ratio of particles smaller than the reference sample in the tested sample. This index is then used as the preferred value and classified into three levels. This method is applicable not only to ternary cathode materials but also covers all cathode and anode materials. It effectively reduces the influence of subjective human factors, achieves standardized and comprehensive evaluation, accurately assesses the degree of particle breakage in active materials, provides reliable data support for the optimization of active materials and solutions, and significantly improves evaluation efficiency and quality. Attached Figure Description
[0025] Figure 1 The particle size distribution diagrams are of the test sample and the reference sample in Example 1 of the present invention.
[0026] Figure 2 This is a SEM morphology observation image of the sample to be tested in Example 1 of the present invention;
[0027] Figure 3 The particle size distribution diagrams are of the test sample and the reference sample in Example 2 of the present invention.
[0028] Figure 4 SEM morphology observation image of the sample to be tested in Example 2 of the present invention. Detailed Implementation
[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0030] Example 1: Evaluation of the breakage and degree of breakage of two positive electrode active material particles (NCM), including the following steps:
[0031] Step 1: Prepare reference sample electrode sheets and test sample electrode sheets of the same system; where A is the reference sample, B and C are the test samples, and A, B and C are electrode sheets of the same system but different degrees of compaction;
[0032] Step 2: The electrode sheets to be tested and the reference electrode sheets are scraped off powder, soaked in DMF, and stirred at 60°C to remove the binder components.
[0033] Step 3: Perform particle size analysis on the reference sample and the sample to be tested obtained in Step 2 to obtain the particle size distribution curves as shown below. Figure 1 As shown.
[0034] Step 4: Determine whether the peak position of the particle size distribution curve of the test sample has shifted towards smaller particles compared to the reference sample. If the shift occurs, it is determined that breakage has occurred. In this embodiment, the peak positions of the particle size distribution curves of B and C have shifted towards smaller particles relative to the reference sample A, indicating that the active material particles of B and C have been broken.
[0035] Further evaluation of the degree of breakage was conducted using the sample breakage index R, which is calculated as R = N × V × 100%; where N is the minimum particle size peak position shift rate of the test sample compared to the reference sample; and V is the volume percentage of particles smaller than the minimum particle size in the test sample compared to the reference sample.
[0036] N=(d0-d x ) / d0×100%, where d0 is the smallest particle size in the reference sample, d x The minimum particle size of the sample to be tested.
[0037] The data obtained from the particle size distribution curve in this embodiment are shown in Table 1.
[0038] Table 1
[0039]
[0040]
[0041] A larger R value indicates a more severe degree of fragmentation, while a smaller R value indicates a less severe degree of fragmentation. Based on the R value, the degree of fragmentation is divided into three levels: mild, moderate, and severe; where mild is R < 0.02%, moderate is 0.02% ≤ R ≤ 0.05%, and severe is R > 0.05%. Therefore, the degree of fragmentation of the cathode material in this application is B > C, and both belong to severe fragmentation, based on the SEM morphology observation images of the cathode (…). Figure 2 It can be seen that the evaluation results are consistent with the patterns shown by SEM observations. Based on this, the patent has high accuracy and feasibility.
[0042] Example 2: Similar to Example 1, Example 2 evaluates the negative electrode active material, lithium iron phosphate. Figure 3The particle size distribution curves are shown. A is the reference sample, and B and C are the samples to be tested. The results show that the peak positions of the particle size distribution curves of B and C shift towards smaller particles relative to the reference sample A, indicating that the active material particles of B and C are broken.
[0043] The data obtained from the particle size distribution curve in this embodiment are shown in Table 2.
[0044] Table 2
[0045] Sample Name D(μm) N(％) V(％) R(％) A <![CDATA[0.594(D0)]]> 0.00 0.00 0.000 B <![CDATA[0.314(D x )]]> 47.14 0.37 0.174 C <![CDATA[0.276(D x )]]> 53.54 0.47 0.252
[0046] The negative electrode breakage index R obtained from this embodiment B =0.174%, R C =0.252%; Therefore, the degree of particle breakage of the negative electrode active material is: B < C, and both belong to severe breakage, combined with the SEM morphology observation image of the negative electrode ( Figure 4 It can be seen that the evaluation results are consistent with the patterns shown by SEM observations. Based on this, the patent has high accuracy and feasibility.
[0047] The present invention also includes a device for evaluating the crushing of active material particles and the degree of crushing, the device comprising:
[0048] The information acquisition module is used to acquire the particle size test parameters of the electrode sheet to be tested and the reference electrode sheet, including the position of the peak point of the particle size distribution curve, or the minimum particle size in the sample to be tested and the reference sample, and the volume ratio of particles smaller than the minimum particle size value in the sample to be tested.
[0049] The analysis module analyzes the data from the information acquisition module;
[0050] The judgment module determines the breakage and degree of breakage of the active material particles based on the results of the analysis module.
[0051] The present invention also includes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the program, implements the fracture evaluation method or the fracture degree evaluation method.
[0052] The present invention also includes a storage medium storing a computer program thereon, which, when executed by a processor, implements the method for evaluating the breakage or the method for evaluating the degree of breakage.
[0053] In summary, the technical solution proposed in this application presents a novel approach to assess the degree of particle breakage in active materials through particle size testing. First, the peak position of the particle size distribution curve is used to determine whether significant breakage has occurred. Then, combined with the mathematical formula output by the sample breakage index R, the breakage index is calculated using the minimum particle size peak shift rate between the tested sample and the reference sample, as well as the volume ratio of particles smaller than the reference sample in the tested sample. This index is then used as the preferred value and classified into three levels. This approach is applicable not only to ternary cathode materials but also covers all cathode and anode materials. It effectively reduces the influence of subjective human factors, achieves standardized and comprehensive assessment, accurately evaluates the degree of particle breakage in active materials, provides reliable data support for the optimization of active materials and solutions, and significantly improves assessment efficiency and quality.
[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.
[0055] Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.
[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A method for evaluating the breakage of active material particles, characterized in that, Specifically, the following steps are included: Step 1: Prepare reference sample electrodes and test sample electrodes of the same system; Step 2: Pre-treat the electrode sheets to be tested and the reference electrode sheets by scraping off powder, soaking, and filtering to remove the binder components; Step 3: Perform particle size testing on the reference sample and the sample to be tested obtained in step 2 to obtain the particle size distribution curve; Step 4: Determine whether the peak position of the particle size distribution curve of the sample to be tested has shifted towards smaller particles compared with the reference sample. If the shift has occurred, it is determined that breakage has occurred.
2. A method for evaluating the degree of breakage of active material particles, characterized in that, The method for evaluating the breakage of active material particles as described in claim 1, wherein when breakage is determined to have occurred, the degree of breakage is evaluated using a sample breakage index R, where R = N × V × 100%; N is the minimum particle size peak position shift rate of the test sample compared to the reference sample; and V is the volume percentage of particles smaller than the minimum particle size of the reference sample in the test sample.
3. The method for evaluating the degree of fragmentation of active material particles according to claim 2, characterized in that, N=(d0-d x ) / d0×100%, where d0 is the smallest particle size in the reference sample, d x The minimum particle size of the sample to be tested.
4. The method for evaluating the degree of fragmentation of active material particles according to claim 2, characterized in that, The larger the value of R, the more severe the breakage; the smaller the value of R, the less severe the breakage.
5. The method for evaluating the degree of fragmentation of active material particles according to claim 2, characterized in that, Based on the R value, the degree of fragmentation is divided into three levels: light, moderate, and severe; light is defined as R < 0.02%, moderate as 0.02% ≤ R ≤ 0.05%, and severe as R > 0.05%.
6. The method for evaluating the degree of fragmentation of active material particles according to claim 1, characterized in that, The reference sample electrode mentioned in the first step is an electrode sample that has not undergone rolling or recycling.
7. The method for evaluating the degree of fragmentation of active material particles according to claim 1, characterized in that, The solution used for soaking in the second step is a solvent for dissolving the adhesive; the solvent is NMR, DMF or DMSO, and the soaking temperature is 50℃~80℃.
8. A device for evaluating the crushing and degree of crushing of active material particles, characterized in that, The device includes: The information acquisition module is used to acquire the particle size test parameters of the electrode sheet to be tested and the reference electrode sheet, including the position of the peak point of the particle size distribution curve, or the minimum particle size in the sample to be tested and the reference sample, and the volume ratio of particles smaller than the minimum particle size value in the sample to be tested. The analysis module analyzes the data from the information acquisition module; The judgment module determines the breakage and degree of breakage of the active material particles based on the results of the analysis module.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the crushing evaluation method according to claim 1 or the crushing degree evaluation method according to any one of claims 2-7.
10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for evaluating the degree of breakage according to claim 1 or the method for evaluating the degree of breakage according to any one of claims 2-7.