Electrode additive migration quantification method, device, equipment, medium and product

Abstract

The invention discloses a migration quantification method, device and equipment of an electrode additive, a medium and a product, and relates to the field of battery preparation. The method comprises the following steps: acquiring a first carbon content corresponding to a first pole piece surface of a pole piece sample; performing a stripping test on the second pole piece surface of the pole piece sample to obtain a stripped second pole piece surface; obtaining a second carbon content corresponding to the stripped second pole piece surface; and obtaining the migration proportion of the electrode additive based on the first carbon content and the second carbon content. Through the mode, the migration proportion can be qualitatively and quantitatively analyzed by means of the change condition of the carbon element forming the electrode additive, and the coating uniformity of the electrode additive and the preparation excellence of an electrode sample can be known conveniently. The method can be applied to various scenes such as a battery preparation scene, a material science research scene, an automobile industry scene, a consumer electronics scene and a renewable energy scene.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery preparation, and in particular to a migration quantification method, device, equipment, medium and product for electrode additives. Background Art

[0002] Battery technology is an indispensable component of modern electronic devices and energy storage systems. Batteries are used in many scenarios. The preparation of electrode samples is a key step in the battery preparation process, and the electrode samples will directly affect the performance and quality of the battery.

[0003] In the related art, during the production process of electrode samples, there will be migration of electrode additives such as conductive agents and adhesives. The migration process is mainly determined by electron microscope observation of the cross-section.

[0004] However, electron microscope observation can usually only conduct qualitative analysis on the migration process of electrode additives. Therefore, it is impossible to effectively evaluate the degree of migration through the observation process, and thus it is impossible to evaluate the manufacturing effect of the electrode sample. Summary of the invention

[0005] The embodiments of the present application provide a migration quantification method, device, equipment, medium and product for electrode additives, which can qualitatively and quantitatively analyze the migration ratio by means of the change of the carbon element constituting the electrode additive, so as to understand the coating uniformity of the electrode additive and the preparation quality of the electrode sample. The technical solution is as follows.

[0006] In one aspect, a method for quantifying migration of an electrode additive is provided, the method comprising:

[0007] Obtaining a first carbon content corresponding to a first pole piece surface of a pole piece sample, wherein the first carbon content is used to describe the content of the carbon element on the first pole piece surface, wherein the pole piece sample is a sample obtained by coating a slurry on a substrate, wherein the slurry includes an electrode additive containing the carbon element;

[0008] Performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling, wherein the first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample;

[0009] Obtaining a second carbon content corresponding to the second pole piece surface after stripping, wherein the second carbon content is used to describe the content of carbon elements on the second pole piece surface after stripping;

[0010] The migration ratio of the electrode additive is obtained based on the first carbon content and the second carbon content, and the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

[0011] In another aspect, a migration quantification device for an electrode additive is provided, the device comprising:

[0012] an acquisition module, used for acquiring a first carbon content corresponding to a first pole piece surface of a pole piece sample, wherein the first carbon content is used for describing the content of the carbon element on the first pole piece surface, wherein the pole piece sample is a sample obtained by coating a slurry on a substrate, wherein the slurry includes an electrode additive containing the carbon element;

[0013] A testing module, used for performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling, wherein the first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample;

[0014] The acquisition module is further used to acquire a second carbon content corresponding to the second pole piece surface after the stripping, wherein the second carbon content is used to describe the content of carbon elements on the second pole piece surface after the stripping;

[0015] The acquisition module is also used to acquire the migration ratio of the electrode additive based on the first carbon content and the second carbon content, and the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

[0016] On the other hand, a computer device is provided, which includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement the migration quantification method of the electrode additive as described in any of the above-mentioned embodiments of the present application.

[0017] On the other hand, a computer-readable storage medium is provided, wherein at least one instruction, at least one program, a code set or an instruction set is stored in the storage medium, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the migration quantification method of the electrode additive as described in any of the above-mentioned embodiments of the present application.

[0018] On the other hand, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the migration quantification method of the electrode additive described in any of the above embodiments.

[0019] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0020] For the electrode sample, a first carbon content of the first electrode surface is obtained, and a second carbon content of the second electrode surface after stripping is obtained. While ensuring the structural density of the prepared electrode sample based on the stripping test, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive in the preparation process of the electrode sample, thereby avoiding the problem of only qualitatively analyzing whether the electrode additive has migrated through electron microscope observation method. With the help of the change of the main element "carbon element" constituting the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, facilitating the understanding of the coating uniformity of the electrode additive based on the migration ratio, and facilitating a more accurate understanding of the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a structural block diagram of a quantization system provided by an exemplary embodiment of the present application;

[0023] Figure 2 is a flow chart of a migration quantification method of an electrode additive provided by an exemplary embodiment of the present application;

[0024] Figure 3 is a flow chart of a migration quantification method of an electrode additive provided by another exemplary embodiment of the present application;

[0025] Figure 4 is a flow chart of a migration quantification method of an electrode additive provided by another exemplary embodiment of the present application;

[0026] Figure 5 is a schematic diagram of a first energy spectrum diagram and a first grayscale energy spectrum diagram provided by an exemplary embodiment of the present application;

[0027] Figure 6 is a flow chart of a migration quantification method of an electrode additive provided by another exemplary embodiment of the present application;

[0028] Figure 7 is a structural block diagram of a migration quantification device for electrode additives provided by an exemplary embodiment of the present application;

[0029] Figure 8 It is a structural block diagram of a terminal provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0031] In the related art, during the production process of the electrode sample, there will be migration of electrode additives such as conductive agents and adhesives, and the migration process is mainly judged by electron microscope observation of the section. However, electron microscope observation can usually only perform qualitative analysis on the migration process of electrode additives, so it is impossible to effectively evaluate the degree of migration through the observation process, and thus it is impossible to evaluate the production effect of the electrode sample.

[0032] In the embodiments of the present application, a migration quantification method of an electrode additive is introduced, which can qualitatively and quantitatively analyze the migration ratio by means of the change of the carbon element constituting the electrode additive, so as to understand the coating uniformity of the electrode additive and the preparation quality of the electrode sample. The migration quantification method of the electrode additive provided in the embodiments of the present application can be applied to various scenarios such as battery preparation scenarios, material science research scenarios, automotive industry scenarios, consumer electronics scenarios, renewable energy scenarios, etc., and the embodiments of the present application are not limited to this.

[0033] In an optional embodiment, the migration quantification method of electrode additives is applied to a battery preparation scenario as an example for explanation.

[0034] Schematically, a positive electrode sheet sample (or positive electrode sheet) is obtained by coating a slurry including a positive electrode main powder on a substrate, and a negative electrode sheet sample (or negative electrode sheet) is obtained by coating a slurry including a negative electrode main powder on a substrate; while ensuring that the positive electrode sheet and the negative electrode sheet are dry and clean, the positive electrode sheet and the negative electrode sheet are placed between insulating materials to ensure that the two are not in direct contact; an electrolyte is obtained according to the battery type (such as a lithium-ion battery); the electrolyte is evenly coated on the electrode surface, or the electrolyte is added during the assembly process; a separator is placed between the positive electrode sheet and the negative electrode sheet to prevent short circuit and allow ions to pass through, thereby obtaining a battery assembly; the battery assembly is placed in a suitable casing and sealed, thereby obtaining a battery including a casing. Among them, taking the positive electrode pole piece sample as an example, the pole piece sample is a sample obtained after coating the slurry on the substrate, and the slurry includes an electrode additive containing carbon elements. For any first pole piece surface of the pole piece sample, the first carbon content corresponding to the first pole piece surface is obtained by the content of the carbon element on the first pole piece surface; in addition, a stripping test is performed on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after stripping, and thus the second carbon content corresponding to the second pole piece surface after stripping is obtained based on the content of the carbon element on the second pole piece surface after stripping; thus, through the difference between the first carbon content and the second carbon content, the migration ratio of the electrode additive including the carbon element in the preparation process of the pole piece sample is analyzed, and the electrode additive is quantitatively described, which helps to more accurately analyze the coating uniformity of the electrode additive through the migration ratio, and also helps to understand the coating uniformity of the slurry, and also helps to analyze the AC resistance of the battery prepared based on the electrode additive, and improve the preparation accuracy of the battery prepared by the pole piece sample.

[0035] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions. For example, the data packets, metadata and other contents involved in this application are all obtained with full authorization.

[0036] Secondly, the quantification system involved in the embodiment of the present application is described. The migration quantification method of the electrode additive provided in the embodiment of the present application can be implemented by the terminal alone, or by the terminal and the server through data interaction. The embodiment of the present application does not limit this. Optionally, the migration quantification method of the electrode additive executed by the terminal is used as an example for description.

[0037] For illustration, please refer to Figure 1 The quantification system involves a terminal 110, and the terminal 110 includes the following processes in the process of preparing the electrode sample.

[0038] In some embodiments, the terminal 110 obtains a first carbon content corresponding to a first pole piece surface of the pole piece sample.

[0039] Among them, the first carbon content is used to describe the content of carbon elements on the surface of the first electrode piece. The electrode piece sample is a sample obtained after coating the slurry on the substrate, and the slurry includes an electrode additive containing carbon elements.

[0040] In an illustrative manner, a slurry including an electrode additive is prepared in advance, wherein the electrode additive includes a carbon element; the slurry is coated on a substrate to obtain an electrode sample. Taking any side of the electrode sample as a first electrode side as an example, the content of the carbon element on the first electrode side is analyzed to obtain a first carbon content corresponding to the first electrode side.

[0041] In some embodiments, the terminal 110 performs a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling.

[0042] The first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample. Schematically, the peeling test is used to peel off the second pole piece surface from a surface after the second pole piece surface is attached to the surface, so as to obtain the second pole piece surface after peeling; the peeling test is a step in the preparation process of the pole piece sample, which is used to evaluate the stability and strength quality of the pole piece sample. The application of the subsequent pole piece sample can be analyzed more specifically through the second pole piece surface after peeling.

[0043] In some embodiments, the terminal 110 obtains the second carbon content corresponding to the second electrode surface after stripping.

[0044] Among them, the second carbon content is used to describe the content of carbon elements on the second electrode surface after stripping. Schematically, the second electrode surface after the stripping test can indirectly reflect the application characteristics of the electrode sample during the application process. Therefore, the carbon content analysis of the second electrode surface after stripping can more specifically analyze the coating of the electrode additive on the second electrode surface after the stripping test while considering the possible migration of the electrode additive during the stripping test, thereby improving the targetedness and accuracy of obtaining the first carbon content and the second carbon content.

[0045] In some embodiments, the terminal 110 obtains a migration ratio of the electrode additive based on the first carbon content and the second carbon content.

[0046] Among them, the migration ratio is used to characterize the migration of electrode additives during the preparation process of electrode samples.

[0047] Schematically, the first carbon content describes the carbon element content of the first pole piece surface in the pole piece sample. The stripping test is a step used to stabilize the structure of the pole piece sample in the preparation process of the pole piece sample. The second carbon content corresponding to the second pole piece surface after stripping can also characterize the migration of the electrode additives in the process of coating the pole piece sample and the migration of the electrode additives during the stripping test. It can not only quantify the migration ratio of the electrode additives in the preparation process of the pole piece sample, but also make the migration ratio calculated thereby more accurate.

[0048] It is worth noting that the above-mentioned terminals include but are not limited to mobile terminals such as mobile phones, tablet computers, portable laptops, intelligent voice interaction devices, smart home appliances, etc., and can also be implemented as desktop computers, etc.; the above-mentioned servers can be independent physical servers or cloud servers.

[0049] In combination with the above-mentioned noun introduction and application scenarios, the migration quantification method of the electrode additive provided in the present application is described, and the application of the method to the terminal is used as an example for description, such as Figure 2 As shown, the method includes the following steps 210 to 240.

[0050] Step 210, obtaining a first carbon content corresponding to a first pole piece surface of the pole piece sample.

[0051] Schematically, the pole piece sample is used to prepare the electrode pole piece of the battery. Especially in lithium-ion batteries, the pole piece sample is a key component for the electrochemical reaction inside the battery.

[0052] Among them, the electrode sample is a sample obtained after coating the slurry on the substrate, and the slurry includes an electrode additive containing carbon element.

[0053] Schematically, the electrode additive is a material used in the preparation process of the electrode sample to improve the electrochemical performance and safety of the electrode sample. Optionally, the main component element of the electrode additive is carbon, which is an important factor in providing conductivity to the electrode sample.

[0054] Optionally, the electrode additive includes a conductive agent, the main component element of the conductive agent is carbon, and carbon is the main source of conductivity provided by the conductive agent; the function of the conductive agent is to improve the electronic conductivity of the battery and ensure that the electrode sample has good charge and discharge performance.

[0055] Schematically, the types of conductive agents include but are not limited to carbon black, conductive graphite, carbon fiber [such as vapor grown carbon fiber (VGCF)], carbon nanotubes (CNTs) and graphene, etc. The role of conductive agents in the preparation of pole piece samples is not limited to improving conductivity, but also includes improving pole piece processability, promoting electrolyte infiltration of pole piece samples, and improving battery capacity and rate performance.

[0056] Optionally, the pole piece sample is usually composed of electrode material, conductive agent, binder and current collector. The electrode material is a material for storing lithium ions, such as the positive electrode main powder used to obtain the positive pole piece sample and the negative electrode main powder used to obtain the negative pole piece sample; the conductive agent is used to provide conductive assistance to the electrode material, and can collect microcurrents between the electrode materials and between the electrode materials and the current collector, reduce the contact resistance of the electrode, accelerate the movement rate of electrons, and also increase the migration rate of lithium ions in the electrode material, reduce battery polarization, thereby improving the charge and discharge efficiency of the electrode and the service life of the battery; the binder is used to adhere the electrode material and the conductive agent to the current collector; the current collector can also be called a substrate, which is usually a metal foil material, such as copper foil (used as a substrate for the positive pole piece sample) and aluminum foil (used as a substrate for the negative pole piece sample), and its function is to connect the pole piece sample to the external circuit of the battery so that electrons can flow into or out of the battery.

[0057] Schematically, the positive electrode main powder, conductive agent and binder are mixed evenly to form a slurry for preparing positive electrode sheet samples, and the slurry is coated on a substrate (such as copper foil) to obtain positive electrode sheet samples; the negative electrode main powder, conductive agent and binder are mixed evenly to form a slurry for preparing negative electrode sheet samples, and the slurry is coated on a substrate (such as aluminum foil) to obtain negative electrode sheet samples, etc.

[0058] Optionally, the thickness of the substrate coated with the slurry is usually very thin, such as the thickness of copper foil is usually several microns, such as 6μm, 8μm, etc., and even thinner thicknesses such as 4μm, 4.5μm, etc.; the thickness (height) of the pole piece sample obtained after the slurry is coated on the substrate is also small; in addition, the length and width of the pole piece sample are usually at the millimeter level, such as 18mm, 65mm, etc.; when analyzing and applying pole piece samples, the surface characterized by the length and width is usually the pole piece surface.

[0059] Schematically, the pole piece sample has two pole piece surfaces, wherein the first pole piece surface is any one of the two pole piece surfaces; and a first carbon content corresponding to the first pole piece surface in the pole piece sample is obtained.

[0060] The first carbon content is used to describe the content of carbon element on the surface of the first pole piece.

[0061] Illustratively, after the slurry is coated on the substrate, the electrode additive in the slurry is present on the obtained pole piece sample; considering that the electrode additive includes carbon element, the first pole piece surface of the pole piece sample includes carbon element.

[0062] Optionally, the content of elements in the pole piece sample is analyzed by electron microscope scanning, spectral analysis and other methods. For example: using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS) to analyze the distribution and content of carbon elements on the first pole piece surface of the pole piece sample; or, using an electron microscope to scan the energy spectrum of the first pole piece surface of the pole piece sample, and analyzing the distribution and content of carbon elements therein by binarizing the energy spectrum; or, using X-ray fluorescence spectroscopy (XRF) to analyze the first pole piece surface of the pole piece sample, and determining the type, distribution and content of elements by measuring the fluorescence response of the first pole piece surface to X-rays, such as determining the distribution and content of carbon elements, and obtaining the first carbon content.

[0063] Step 220, performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling.

[0064] Schematically, the pole piece sample has two pole piece faces, wherein the first pole piece face is any one of the two pole piece faces, and the second pole piece face is the other pole piece face other than the first pole piece face, that is, the first pole piece face and the second pole piece face are two opposite faces on the pole piece sample.

[0065] Optionally, the peel test is an operation step in the preparation process of the pole piece sample, which is used to evaluate the adhesion strength between the electrode material and the substrate on the pole piece sample; usually the pole piece sample will be used only after the peel test.

[0066] Schematically, the second pole piece surface is adhered to the pre-prepared designated bonding surface through adhesive tape, and the pole piece sample is lightly pressed from the first pole piece surface so that the second pole piece surface and the designated bonding surface are firmly and evenly adhered; then the pole piece sample is peeled off at a preset slow speed to separate the pole piece sample from the adhesive tape. At this time, the second pole piece surface of the pole piece sample is the second pole piece surface after peeling.

[0067] Step 230, obtaining a second carbon content corresponding to the second electrode surface after stripping.

[0068] Indicatively, carbon elements and other materials may still migrate during the stripping test; therefore, by measuring the carbon content on the second electrode surface after stripping, in addition to considering the migration of carbon elements during the coating process, the effect of the adhesive effect on the migration ratio of the carbon element can also be evaluated, which helps to understand the performance changes of the electrode samples in long-term operation.

[0069] The second carbon content is used to describe the content of carbon elements on the surface of the second electrode piece after stripping.

[0070] Illustratively, after the slurry is coated on the substrate, the electrode additive in the slurry is present on the obtained pole piece sample; considering that the electrode additive includes carbon element, the second pole piece surface of the pole piece sample includes carbon element.

[0071] Optionally, use an SEM equipped with EDS to analyze the distribution and content of carbon elements on the second pole piece surface of the pole piece sample; or, use an electron microscope to scan the energy spectrum of the second pole piece surface of the pole piece sample, and analyze the distribution and content of carbon elements therein by binarizing the energy spectrum; or, use XRF to analyze the second pole piece surface of the pole piece sample to determine the distribution and content of carbon elements, etc., to obtain the second carbon content.

[0072] Step 240, obtaining a migration ratio of the electrode additive based on the first carbon content and the second carbon content, where the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

[0073] Schematically, the first carbon content describes the carbon content on the surface of the first electrode piece; taking into account the migration of carbon elements during the pasting application of the electrode piece sample, the second carbon content describes the carbon content on the surface of the second electrode piece after the peeling test. Comparing the first carbon content with the second carbon content can directly reflect the loss and migration of carbon elements during the peeling test, and can better provide effective information related to the impact of the peeling process on the carbon element.

[0074] Optionally, considering that part of the electrode additive may be taken away from the second electrode sheet surface during the stripping test, the second carbon content is usually less than the first carbon content.

[0075] Schematically, the amount by which the second carbon content is reduced relative to the first carbon content is calculated as the migration amount that describes the migration of the electrode additive during the preparation process of the electrode sample; or, the relative difference between the first carbon content and the second carbon content is compared, such as calculating the amount by which the second carbon content is reduced relative to the first carbon content, and calculating the sum of the second carbon content and the first carbon content, and taking the quotient of the reduction and the sum as the migration ratio, etc.

[0076] It is worth noting that the above are merely illustrative examples and are not limited to the embodiments of the present application.

[0077] In summary, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive during the preparation of the electrode sample, thereby avoiding the problem of only being able to qualitatively analyze whether the electrode additive has migrated through electron microscope observation. With the help of the change of the main element "carbon element" that constitutes the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, making it easier to understand the coating uniformity of the electrode additive based on the migration ratio, and also to more accurately understand the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample.

[0078] In an optional embodiment, the main component of the electrode additive is carbon, so the migration ratio of the electrode additive can be analyzed by the content of carbon. Figure 3 As shown above Figure 2 The illustrated embodiment may also be implemented as steps 310 to 360 as follows; wherein step 240 may also be implemented as steps 340 to 360 as follows.

[0079] Step 310, obtaining a first carbon content corresponding to a first pole piece surface of a pole piece sample.

[0080] Among them, the first carbon content is used to describe the content of carbon elements on the surface of the first electrode piece. The electrode piece sample is a sample obtained after coating the slurry on the substrate, and the slurry includes an electrode additive containing carbon elements.

[0081] Schematically, the electrode additive includes at least one of a conductive agent and a binder, the main component element of the conductive agent is carbon, and the conductive agent is used to provide conductive assistance to the electrode material, such as improving the conductivity of the electrode material; common binders such as polyvinylidene fluoride (PVDF) also contain carbon; a slurry is obtained by mixing and stirring the conductive agent, the binder, and the electrode material in a preset proportion, and the binder is used to bond the electrode material, the conductive agent, and the substrate; the electrode material includes a positive electrode main powder and a negative electrode main powder.

[0082] Among them, when preparing the positive electrode sheet sample, the conductive agent, the binder and the positive electrode main powder are mixed and stirred in a preset proportion to obtain a slurry, and the slurry is coated on a pre-prepared substrate (such as copper foil) to obtain a positive electrode sheet sample; when preparing the negative electrode sheet sample, the conductive agent, the binder and the negative electrode main powder are mixed and stirred in a preset proportion to obtain a slurry, and the slurry is coated on a pre-prepared substrate (such as aluminum foil) to obtain a negative electrode sheet sample, etc.

[0083] In schematic, considering that the role of carbon content is to evaluate the distribution and migration of electrode additives, the carbon content of two opposite electrode surfaces on the electrode sample can be analyzed separately to analyze the migration of carbon content. In schematic, any one of the two electrode surfaces is used as the first electrode surface, and the first carbon content of the first electrode surface is analyzed to qualitatively and quantitatively represent the distribution and content of carbon elements on the first electrode surface, thereby indirectly characterizing the distribution and content of electrode additives on the first electrode surface.

[0084] Step 320, performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling.

[0085] The first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample.

[0086] In an optional embodiment, the second pole piece surface of the pole piece sample is attached to the designated bonding surface by adhesive tape.

[0087] Schematically, the second electrode surface is another electrode surface of the electrode sample except the first electrode surface; the designated bonding surface is a pre-prepared plane for bonding the second electrode surface of the electrode sample, such as the designated bonding surface is an iron plate, a steel plate, etc. For example: the second electrode surface is bonded to the pre-prepared iron plate by adhesive tape.

[0088] Optionally, the second electrode surface is attached to the designated bonding surface using polyethylene terephthalate (PET) adhesive tape. Schematically, PET adhesive tape is an adhesive tape with polyester film (PET) as the base material, which has excellent high temperature resistance, good dimensional stability, chemical stability, initial adhesion and lasting adhesion.

[0089] Optionally, by lightly pressing the first pole piece surface to adhere the second pole piece surface to the specified bonding surface, the first pole piece surface and the second pole piece surface are made flat, reducing the interface resistance and optimizing the electrochemical reaction efficiency of the battery, which helps to maintain the structural stability of the pole piece sample and prevent it from falling off or displacement.

[0090] In an optional embodiment, the second pole piece surface is peeled off from the designated bonding surface at a preset peeling speed to obtain a peeled second pole piece surface.

[0091] Optionally, taking the iron plate as the designated bonding surface, after the second pole piece surface is firmly bonded to the iron plate, the second pole piece surface is peeled off from the iron plate at a preset peeling speed. For example, the second pole piece surface is peeled off from the iron plate manually at a preset peeling speed; or, the second pole piece surface is peeled off from the iron plate using an intelligent electronic tensile testing machine, etc.

[0092] Schematically, the preset peeling speed is relatively slow, and the peeling speed is preset to be less than 1 cm / s, until the second pole piece surface is completely peeled off from the iron plate and stops, at which time the peeled second pole piece surface.

[0093] Step 330, obtaining a second carbon content corresponding to the second electrode surface after stripping.

[0094] The second carbon content is used to describe the content of carbon elements on the surface of the second electrode piece after stripping.

[0095] Schematically, considering that the role of carbon content is to evaluate the distribution and migration of electrode additives, in the process of analyzing the carbon content and thus analyzing the migration of the carbon content, not only the first carbon content of the first electrode surface will be analyzed, but also when the second electrode surface is obtained by the stripping test, the content of carbon elements on the second electrode surface will be analyzed, so as to qualitatively and quantitatively express the distribution and content of carbon elements on the second electrode surface, thereby indirectly characterizing the distribution and content of electrode additives on the second electrode surface.

[0096] Step 340: Obtain a difference between the first carbon content and the second carbon content to obtain a first value.

[0097] Illustratively, after analyzing and determining the first carbon content and the second carbon content, a difference operation is performed on the first carbon content and the second carbon content to obtain a first value representing the difference between the first carbon content and the second carbon content.

[0098] Optionally, the carbon content represents the content of the carbon element; or, the carbon content represents the ratio of the carbon element content to the total element content; schematically, the first carbon content represents the ratio of the carbon element content on the first pole piece surface to the total element content distributed on the first pole piece surface, and the second carbon content represents the ratio of the carbon element content on the second pole piece surface to the total element content distributed on the second pole piece surface.

[0099] For example: the first carbon content corresponding to the first pole piece surface is 20.74%, which means that the carbon content accounts for 20.74% of the total element content on the first pole piece surface; the second carbon content corresponding to the second pole piece surface is 14.92%, which means that the carbon content accounts for 14.92% of the total element content on the second pole piece surface; if the difference between the first carbon content and the second carbon content is calculated, the first value obtained is 5.82%.

[0100] Step 350: Obtain the sum of the first carbon content and the second carbon content to obtain a second value.

[0101] Schematically, the second value roughly describes the total content of carbon elements distributed on the electrode sample; for example: the first carbon content corresponding to the first electrode surface is 20.74%, and the second carbon content corresponding to the second electrode surface is 14.92%. If the sum of the first carbon content and the second carbon content is calculated, the second value obtained is 35.66%.

[0102] Step 360: Taking the quotient of the first value and the second value as the migration ratio of the electrode additive.

[0103] Illustratively, after the first value and the second value are calculated, the migration ratio of the electrode additive is obtained by taking the first value as the dividend and the second value as the divisor.

[0104] Among them, the migration ratio is used to characterize the migration of electrode additives during the preparation process of electrode samples.

[0105] The following formula 1 is a calculation formula for the migration ratio.

[0106] Formula 1:

[0107] η=(α-β) / (a+β)*100%

[0108] Among them, η is used to characterize the migration ratio; α is used to characterize the first carbon content corresponding to the first pole piece surface; β is used to characterize the second carbon content corresponding to the second pole piece surface; α-β is used to characterize the first value; α+β is used to characterize the second value.

[0109] In an optional embodiment, a region division operation is performed on the pole piece sample to obtain at least two first sub-regions in the first pole piece surface and at least two second sub-regions in the second pole piece surface.

[0110] Therein, at least two first sub-regions correspond one-to-one to at least two second sub-regions.

[0111] In an illustrative manner, a region division operation is performed on the electrode sample without damaging the electrode product, so as to divide an entire first electrode surface into at least two first sub-regions, and the second electrode surface includes at least two second sub-regions that are opposite to the at least two first sub-regions. For example: the first sub-region 1 in the first electrode surface is opposite to the second sub-region 1 in the second electrode surface; the first sub-region 2 in the first electrode surface is opposite to the second sub-region 2 in the second electrode surface.

[0112] In an optional embodiment, first sub-carbon contents corresponding to at least two first sub-regions are obtained, and second sub-carbon contents corresponding to at least two second sub-regions are obtained.

[0113] Illustratively, at least two first sub-regions are scanned with an electron microscope to obtain first sub-carbon contents corresponding to the at least two first sub-regions; at least two second sub-regions are scanned with an electron microscope to obtain second sub-carbon contents corresponding to the at least two second sub-regions.

[0114] In an optional embodiment, based on the relative relationship between the first sub-region and the second sub-region, the region migration ratios respectively corresponding to at least two first sub-regions are acquired.

[0115] Schematically, for any first sub-region, the first sub-carbon content and the second sub-carbon content corresponding to the second sub-region corresponding thereto are obtained, and the regional migration ratio corresponding to the first sub-region is obtained based on the first sub-carbon content and the second sub-carbon content; thereby, the regional migration ratios corresponding to at least two first sub-regions can be obtained. In addition, it can also be called the regional migration ratios corresponding to at least two second sub-regions.

[0116] Optionally, the content shown in the above formula 1 is adopted, η Characterize the regional migration ratio, α Taking β as an example to characterize the first sub-carbon content and β as the second sub-carbon content, the regional migration ratio is calculated.

[0117] In an optional embodiment, the migration ratio of the electrode additive is obtained based on at least two regional migration ratios.

[0118] Illustratively, after obtaining at least two regional migration ratios, the average value of the at least two regional migration ratios is used as the migration ratio of the electrode additive; or, the smallest regional migration ratio is used as the migration ratio of the electrode additive; or, the largest regional migration ratio is used as the migration ratio of the electrode additive, etc.

[0119] As shown in Table 1 below, the pre-acquired electrode samples are divided into three regions, each of which corresponds to a first sub-region and a second sub-region; each first sub-region corresponds to a first sub-carbon content, and each second sub-region corresponds to a second sub-carbon content; then, based on the above formula 1, the corresponding regional migration ratio is calculated through the first sub-carbon content and the second sub-carbon content of the same region.

[0120] Table 1

[0121] / Region 1 Area 2 Area 3 The first side 20.74％ 20.17％ 20.04％ The second pole 14.92％ 14.47％ 14.46％ Regional migration ratio η 16.32％ 16.45％ 16.17％

[0122] Optionally, for the regional migration ratios corresponding to the above-mentioned regions 1, 2 and 3, the average value of the three regional migration ratios is solved as the migration ratio corresponding to the electrode additive. For example, the migration ratio of the electrode additive is about 16.31%.

[0123] In some embodiments, a mean operation is performed on the first sub-carbon contents corresponding to at least two first sub-regions to obtain a first carbon content corresponding to the first pole piece surface; a mean operation is performed on the second sub-carbon contents corresponding to at least two second sub-regions to obtain a second carbon content corresponding to the second pole piece surface; and the migration ratio corresponding to the electrode additive is obtained based on the first carbon content and the second carbon content.

[0124] Schematically, as shown in Table 1, the first sub-carbon contents corresponding to the three first sub-regions are averaged, and the first carbon content corresponding to the first pole piece surface is approximately 20.32%; the second sub-carbon contents corresponding to the three second sub-regions are averaged, and the second carbon content corresponding to the second pole piece surface is approximately 14.62%; the migration ratio corresponding to the electrode additive is calculated based on the above formula 1 to be approximately 16.31%, etc.

[0125] It is worth noting that the above are merely illustrative examples and are not limited to the embodiments of the present application.

[0126] In summary, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive during the preparation of the electrode sample, thereby avoiding the problem of only being able to qualitatively analyze whether the electrode additive has migrated through electron microscope observation. With the help of the change of the main element "carbon element" that constitutes the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, making it easier to understand the coating uniformity of the electrode additive based on the migration ratio, and also to more accurately understand the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample.

[0127] In the embodiment of the present application, the content of obtaining the migration ratio based on the first carbon content and the second carbon content is introduced. Considering that the main component element of the electrode additive is carbon, it is possible to analyze the difference in carbon content of different electrode surfaces of the electrode sample on the basis of ensuring that the electrode sample can be applied through the peeling test, and measure the relative difference and relative change between the two relative electrode surfaces through the ratio of the difference in values ​​and the sum of values, which meets the judgment standard that the smaller the migration ratio, the better the preparation accuracy. It not only quantifies the calculation method of the migration ratio, but also provides an intuitive way to understand the changes in the carbon element migration process.

[0128] In an optional embodiment, an electron microscope is used to scan the electrode surface of the electrode sample, so as to determine the carbon content on the electrode surface through the energy spectrum. Figure 4 As shown above Figure 2The illustrated embodiment may also be implemented as steps 410 to 450 as follows; wherein step 210 may also be implemented as steps 410 to 420 as follows; and step 230 may also be implemented as steps 440 to 450 as follows.

[0129] Step 410, scanning the first pole piece surface of the pole piece sample through an electron microscope to obtain a first energy spectrum diagram.

[0130] Schematically, in the preparation stage, an appropriate acceleration voltage (usually 10-20 kV) is selected for the SEM with EDS function to optimize the image quality and energy spectrum signal; the working distance between the SEM and the pole piece sample is adjusted to obtain a clear image, and the working distance is usually between a few millimeters and a few centimeters.

[0131] In the scanning stage, the pole piece sample is placed in the SEM sample chamber. After ensuring that the pole piece sample is correctly positioned and fixed, the surface of the pole piece sample is observed at low magnification to ensure that the appropriate area is selected for detailed scanning; then switch to high magnification and focus on the first pole piece surface to be analyzed; then start the EDS system on the microscope control interface and select the region of interest (ROI), such as selecting the entire first pole piece surface, or selecting a partial sub-region in the first pole piece surface: then, while performing SEM scanning on the ROI, use the EDS system to collect X-rays emitted from the surface of the pole piece sample, which are collected and converted into electrical signals by the detector to form an energy spectrum, such as forming the first energy spectrum for the first pole piece surface. Usually, the energy spectrum can be displayed on a dedicated software interface to record the required element information.

[0132] The energy spectrum is a graph that shows the energy distribution of X-rays emitted by different elements in the pole piece sample; each element, when excited by an electron beam, emits X-rays from the electron shell inside its atoms, and these X-rays have specific energy characteristics; multiple peaks will be displayed on the energy spectrum, and each peak corresponds to the characteristic X-ray energy of an element, so that the type and content of elements contained in the sample can be identified and quantified. For example: observe the peaks in the first energy spectrum, each peak represents the X-ray energy of a specific element in the first pole piece surface, and the type and content of the element can be determined based on the position and height of the peak.

[0133] The first energy spectrum diagram is used to describe the distribution of carbon elements on the surface of the first electrode.

[0134] Schematically, based on the fact that the electrode sample is obtained by coating a slurry including an electrode additive, and the electrode additive includes carbon, the carbon element will appear as a specific energy peak (carbon element peak) in the first energy spectrum. This energy peak is for the X-ray emission energy unique to the carbon element, mainly the Kα peak and Kβ peak in the K line series. In actual EDS analysis, the Kα peak of the carbon element is the most commonly used characteristic peak for identifying the presence of the carbon element. Among them, when an inner electron (such as an electron in the K shell) is removed, the outer electron emits X-rays when it transitions to this low-energy vacancy. The generated X-ray is called the Kα peak. For the carbon element, this energy peak is usually at 0.277keV; although the Kβ peak is also caused by the outer electron transition caused by the inner electron vacancy, it usually occurs when the outer electron fills the inner vacancy, and has higher energy than the Kα peak. For the carbon element, the appearance of the Kβ peak is relatively rare and relatively weak.

[0135] Optionally, the first energy spectrum is an energy spectrum obtained by focusing on the carbon element signal; schematically, focusing on the energy peak corresponding to the carbon element in the energy spectrum describing the distribution of multiple elements, the energy peak of the carbon element is located in a lower energy range, and the carbon element content information can be obtained by identifying the energy peak and performing quantitative analysis, that is, the energy spectrum of carbon describing the distribution of the carbon element is extracted from the energy spectrum describing the distribution of multiple elements as the first energy spectrum.

[0136] Step 420, based on the distribution of carbon elements on the first energy spectrum, obtain a first carbon content corresponding to the first pole piece surface.

[0137] Indicatively, using tools such as EDS software, the carbon content on the first electrode surface can be calculated based on the area or peak height of the carbon peak. Optionally, the carbon content on the first electrode surface can be calculated by comparing the area or peak height of the carbon peak with that of a standard sample.

[0138] In an optional embodiment, binarization processing is performed on the first energy spectrum map to obtain a first grayscale energy spectrum map.

[0139] Schematically, the first energy spectrum corresponding to the first pole piece surface is converted into a binary image, that is, it is ensured that each pixel in the image has only two possible pixel values, usually 0 (black) and 1 (white).

[0140] In some embodiments, a first processing threshold is determined based on the first energy spectrum map, and a binarization process is performed on the first energy spectrum map based on the first processing threshold to obtain a first grayscale energy spectrum map.

[0141] Optionally, during the binarization process, it is crucial to select an appropriate first processing threshold to determine which pixels represent carbon. Usually, the first processing threshold is set based on the intensity of the carbon peak under X-ray scanning.

[0142] Schematically, the energy peak corresponding to the carbon element is usually a K-line series, and its energy peak is about 0.28keV; then observe the height and shape of the peak, and determine a first processing threshold to best distinguish the carbon peak from the background signal; the setting of the first processing threshold usually needs to take into account the signal-to-noise ratio of the peak, and the first processing threshold should be set at a level significantly higher than the background noise level; this value or a value slightly lower than this value can be selected as the first processing threshold to ensure that all relevant signals can be included. For example: If an obvious peak is found near 0.28keV in the analysis results, and the background count (refers to the count detected by the instrument when no specific signal exists, representing a baseline level to help distinguish the actual signal peak from noise or other non-related signals) is approximately between tens and hundreds of counts, a first processing threshold such as 50 may be set to ensure that the carbon signal can be distinguished.

[0143] Optionally, a grayscale value is determined as the first processing threshold based on the energy peak corresponding to the carbon element; grayscale conversion is performed on the first energy spectrum diagram, and if the pixel value corresponding to any pixel point after the grayscale conversion is higher than the first processing threshold, the pixel value is assigned 1; if the pixel value corresponding to any pixel point after the grayscale conversion is lower than the first processing threshold, the pixel value is assigned 0; after performing the assignment operation on multiple pixel points after the grayscale conversion, the first grayscale energy spectrum diagram is obtained.

[0144] Among them, the pixel value of the display area corresponding to the carbon element in the first grayscale energy spectrum is a first value.

[0145] Illustratively, taking the first value of 0 as an example, a first grayscale energy spectrum is obtained based on binarization processing, wherein the display area where the pixel value is the first value is the area corresponding to the carbon element, and other areas where the pixel value is not the first value but the second value is the area where elements other than carbon are located, such as the second value is 1.

[0146] Optionally, the pixel points corresponding to the pixel values ​​of the first value are usually distributed in a discrete form in the first grayscale energy spectrum, representing the distribution of the carbon element.

[0147] Indicatively, Figure 5As shown, taking the first energy spectrum 510 as an example of the energy spectrum of carbon, the first energy spectrum is in color (not shown in color in the figure); the first energy spectrum 510 is binarized to obtain a first grayscale energy spectrum 520, and the pixel values ​​of the pixels corresponding to the carbon element in the first grayscale energy spectrum 520 are the first value 0, that is, a plurality of scattered black areas in the first grayscale energy spectrum 520; the pixel values ​​of the pixels corresponding to other elements in the first grayscale energy spectrum 520 are the second value 1, that is, a large number of scattered white areas in the first grayscale energy spectrum 520; the first grayscale energy spectrum 520 can more intuitively characterize the distribution of the carbon element and the content of the carbon element.

[0148] In an optional embodiment, an area ratio between an area of ​​a first display area in the first grayscale energy spectrum in which pixel values ​​are first values ​​and an area of ​​a second display area in the first grayscale energy spectrum is obtained as a first carbon content corresponding to the first electrode surface.

[0149] Schematically, in the first grayscale energy spectrum, the area of ​​the display area with the first pixel value is called the first display area, and the area of ​​the first grayscale energy spectrum is called the second display area; based on the fact that the first display area is the area of ​​the display area representing the carbon element, it can show the range occupied by the carbon element; therefore, the ratio of the first display area to the second display area is used as the first carbon content corresponding to the first pole piece surface. For example: the first display area corresponding to the carbon element is 19.6; the second display area is 100, then the first carbon content corresponding to the first pole piece surface is 19.6%, etc.

[0150] Step 430, performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling.

[0151] Schematically, the second pole piece surface is the pole piece surface on the pole piece sample opposite to the first pole piece surface; the peeling test is a test step for evaluating the coating strength and adhesion strength of the pole piece sample based on the second pole piece surface.

[0152] In an optional embodiment, the second pole piece surface of the pole piece sample is attached to the designated bonding surface by adhesive tape.

[0153] In schematic form, the second electrode surface is attached to the designated bonding surface using PET adhesive tape. Optionally, the first electrode surface is lightly pressed to attach the second electrode surface to the designated bonding surface, so that the first electrode surface and the second electrode surface are flat, reducing the interface resistance and optimizing the electrochemical reaction efficiency of the battery, and helping to maintain the structural stability of the electrode sample and prevent it from falling off or displacement.

[0154] In an optional embodiment, the second pole piece surface is peeled off from the designated bonding surface at a preset peeling speed to obtain a peeled second pole piece surface.

[0155] Optionally, after the second electrode surface is firmly attached to the designated bonding surface, the second electrode surface is peeled off from the designated bonding surface at a preset peeling speed. For example, the second electrode surface is peeled off from the designated bonding surface manually at a preset peeling speed; or, the second electrode surface is peeled off from the designated bonding surface using an intelligent electronic tensile testing machine, etc.

[0156] Schematically, the preset peeling speed is relatively slow, and the peeling speed is preset to be less than 1 cm / s, until the second electrode piece surface is completely peeled off from the designated bonding surface, at which time the second electrode piece surface is peeled off.

[0157] Step 440 , using the first brightness and the first contrast to scan the peeled second pole piece surface through an electron microscope to obtain a second energy spectrum corresponding to the peeled second pole piece surface.

[0158] In an optional embodiment, when scanning the first pole piece surface to obtain the first energy spectrum, the electron microscope is set to the first brightness and the first contrast, that is, the first pole piece surface is scanned by the electron microscope with the first brightness and the first contrast.

[0159] Schematically, adjusting brightness and contrast is an important operation performed on an electron microscope, a process that helps to observe the microstructure and features of the material more clearly.

[0160] Optionally, the electron beam intensity in the electron microscope or the signal receiving intensity of the detector is adjusted so that the image reaches an appropriate brightness when observing the first pole piece surface. The brightness mainly affects the overall brightness of the image; for example, the brightness used when scanning the first pole piece surface is the first brightness.

[0161] Optionally, the contrast represents the difference between the brightest part and the darkest part in the image when observing the first pole piece surface. Increasing the contrast can make the details of the image more prominent, making it easier to observe the microstructural differences of the first pole piece surface; for example, the contrast used when scanning the first pole piece surface is the first contrast.

[0162] In some embodiments, when the first brightness and the first contrast are configured, the first carbon content corresponding to the first pole piece surface is determined by scanning the first pole piece surface with an electron microscope. That is, the first carbon content is determined by scanning the first pole piece surface with an electron microscope using the first brightness and the first contrast.

[0163] Schematically, when a first brightness and a first contrast are configured, the first pole piece surface is scanned by an electron microscope to obtain a first energy spectrum corresponding to the first pole piece surface; based on the distribution amount of carbon elements on the first energy spectrum, the first carbon content corresponding to the first pole piece surface is obtained.

[0164] Afterwards, when the second pole piece surface after peeling is obtained based on the peeling test, the brightness of the electron microscope observation is adjusted to the first brightness, and the contrast of the electron microscope observation is adjusted to the first contrast, so as to scan the second pole piece surface after peeling and obtain the second energy spectrum corresponding to the second pole piece surface after peeling.

[0165] The second energy spectrum is used to describe the distribution of carbon elements on the surface of the second electrode after stripping.

[0166] The same first brightness and first contrast are configured for the electron microscope, and the second pole piece surface after peeling is scanned, wherein the second energy spectrum diagram and the first energy spectrum diagram are scanned and acquired based on the same acquisition standard, which can eliminate the influence of variable factors to a certain extent, thereby making the first carbon content and the second carbon content more appropriately comparable, enhancing the measurement accuracy, reducing the errors caused by external factors, and facilitating the acquisition of more accurate and reliable analysis results.

[0167] Step 450, based on the distribution of carbon elements on the second energy spectrum, obtain the second carbon content corresponding to the second electrode surface after stripping.

[0168] In an optional embodiment, binarization processing is performed on the second energy spectrum to obtain a second grayscale energy spectrum.

[0169] Schematically, the second energy spectrum corresponding to the peeled second pole piece surface is converted into a binary image, that is, it is ensured that each pixel in the image has only two possible pixel values, usually 0 (black) and 1 (white).

[0170] In some embodiments, a second processing threshold is determined based on the second energy spectrum map, and a binarization process is performed on the second energy spectrum map based on the second processing threshold to obtain a second grayscale energy spectrum map.

[0171] Optionally, during the binarization process, it is crucial to select an appropriate second processing threshold to determine which pixels represent carbon. Usually, the second processing threshold is set based on the intensity of the carbon peak under X-ray scanning.

[0172] Optionally, a gray value is determined as the second processing threshold based on the energy peak corresponding to the carbon element; gray conversion is performed on the first energy spectrum, and if the pixel value corresponding to any pixel point after the gray conversion is higher than the second processing threshold, the pixel value is assigned 1; if the pixel value corresponding to any pixel point after the gray conversion is lower than the second processing threshold, the pixel value is assigned 0; after performing the assignment operation on multiple pixel points after the gray conversion, a second gray energy spectrum is obtained. Optionally, the first processing threshold and the second processing threshold may be the same or different, which is not limited here.

[0173] Among them, the pixel value of the display area corresponding to the carbon element in the second grayscale energy spectrum is the first value.

[0174] Illustratively, taking the first value of 0 as an example, a second grayscale energy spectrum is obtained based on binarization processing, wherein the display area where the pixel value is the first value is the area corresponding to the carbon element, and other areas where the carbon element is not the first value but the second value are areas where elements other than the carbon element are located, such as the second value of 1.

[0175] Optionally, the pixel points corresponding to the pixel values ​​of the first value are usually distributed in a discrete form in the second grayscale energy spectrum, representing the distribution of the carbon element.

[0176] In an optional embodiment, the area ratio between the area of ​​the third display area in the second grayscale energy spectrum where the pixel value is the first value and the area of ​​the fourth display area in the second grayscale energy spectrum is obtained as the second carbon content corresponding to the second electrode surface after peeling.

[0177] Schematically, in the second grayscale energy spectrum diagram, the area of ​​the display region with the pixel value of the first value is called the third display region area, and the area of ​​the second grayscale energy spectrum diagram is called the fourth display region area; based on the fact that the third display region area is the area of ​​the display region representing the carbon element, it can express the range occupied by the carbon element; therefore, the ratio of the third display region area to the fourth display region area is used as the second carbon content corresponding to the second electrode surface after peeling.

[0178] It is worth noting that the above are merely illustrative examples and are not limited to the embodiments of the present application.

[0179] In summary, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive during the preparation of the electrode sample, thereby avoiding the problem of only being able to qualitatively analyze whether the electrode additive has migrated through electron microscope observation. With the help of the change of the main element "carbon element" that constitutes the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, making it easier to understand the coating uniformity of the electrode additive based on the migration ratio, and also to more accurately understand the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample.

[0180] In the embodiment of the present application, the content of determining the carbon content by scanning the energy spectrum diagram is introduced. This process does not need to destroy the pole piece sample, and the scanning technology can complete the test in a short time, and the scanning efficiency is high; the carbon element can also be significantly distinguished from other elements with its unique energy peak, so that the determination process of the carbon content is not only targeted, but also has high accuracy; in addition, the same brightness and contrast can be used to scan different pole piece surfaces, so that the first carbon content and the second carbon content have more appropriate comparability, and the influence of variable factors is better eliminated, which helps to further enhance the accuracy of the measurement and facilitate the acquisition of more accurate and reliable analysis results.

[0181] In an optional embodiment, a positive electrode sheet sample is obtained by coating a substrate with a slurry including a positive electrode main powder and an electrode additive, and a negative electrode sheet sample is obtained by coating a substrate with a slurry including a negative electrode main powder and an electrode additive; considering that the main component of the positive electrode main powder is metal oxide and the main component of the negative electrode main powder is generally graphite (high in carbon content), there has also been a trend to use silicon-based materials in recent years.

[0182] Therefore, if the main component of the negative electrode main powder is graphite, the electrode piece sample used to analyze the migration ratio is the positive electrode piece sample because the migration ratio of the electrode additive is evaluated by the carbon element; if the main component of the negative electrode main powder is silicon-based material, the electrode piece sample used to analyze the migration ratio is at least one of the positive electrode piece sample and the negative electrode piece sample. Figure 6 As shown, the migration ratio calculation method is described as follows by taking the electrode sample as a positive electrode sample, which includes steps 610 to 670.

[0183] Step 610, obtaining slurry.

[0184] The slurry is obtained by uniformly mixing the positive electrode main powder, electrode additives, glue and solution according to a preset ratio.

[0185] Schematically, the positive electrode powder is the main material used to prepare the positive electrode sheet sample. Common positive electrode powders include nickel cobalt manganese oxide (NCM) and lithium cobalt oxide (LiCoO 2 ), NCM is a ternary material composed of nickel (Ni), cobalt (Co) and manganese (Mn). Common proportions include NCM111, NCM523, NCM622, NCM811, etc. The numbers represent the proportions of nickel, cobalt and manganese. For example, NCM811 means that the proportion of nickel is 80%, and cobalt and manganese each account for 10%. LiCoO 2 It is the earliest material used in commercial lithium-ion batteries, especially widely used in portable electronic devices. In addition, the positive electrode powder can also be prepared by combining other materials, which are not limited here.

[0186] Electrode additives may include conductive agents (such as carbon black or graphite) to enhance the electrical conductivity of the electrode. They may also include structural stabilizers or other functional materials to enhance the mechanical strength of the electrode or improve its electrochemical performance.

[0187] The glue (also called adhesive), usually polyvinylidene fluoride (PVDF) or a similar polymer, is used to bond the electrode material to the substrate. The glue ensures that the electrode material maintains physical and electrical contact during the charge and discharge process. Optionally, the glue is obtained by mixing PVDF and solvent N-methyl-2-pyrrolidone (NMP). PVDF usually does not react chemically with NMP, but NMP as an organic solvent can effectively dissolve PVDF to a viscosity suitable for coating.

[0188] The solvent is usually NMP or other organic solvents, which are used to adjust the viscosity of the slurry to make it easy to apply. During the slurry preparation process, the solvent helps the mixture to mix evenly and is removed by the drying process after coating.

[0189] The above materials are mixed in a preset ratio to ensure the uniformity of the slurry and the consistency of coating, which is crucial to the overall performance and life of the battery. Schematically, the preset ratio is usually a mass ratio, such as the preset ratio is: 80%-90% of the positive electrode main powder; 1%-10% of the conductive agent; 5%-10% of the binder; the amount of the solvent is sufficient to form a slurry viscosity suitable for coating.

[0190] Step 620, coating the slurry on the substrate and obtaining a pole piece sample by baking.

[0191] In schematic form, after the slurry is uniformly stirred, the slurry is coated on a pre-prepared substrate, such as coating the slurry prepared from the positive electrode main powder on an aluminum foil. For example, the slurry is coated on the substrate using a doctor's knife; or, the slurry is coated on the substrate using a slot die; or, the slurry is coated on the substrate using a spray method, etc. The uniformity of the coating has an important influence on the performance of the battery.

[0192] Schematically, the coated substrate needs to go through a baking process to remove the solvent in the slurry. Drying is usually carried out in a drying oven, where the temperature is gradually increased by setting different temperature sections to ensure that the solvent is completely volatilized while avoiding thermal damage to the electrode layer.

[0193] Optionally, the dried substrate may need to be compacted by a roller press or other equipment to increase the density and mechanical strength of the electrode and improve the contact between the electrode and the current collector, thereby improving the energy density and charge and discharge performance of the battery.

[0194] Optionally, at least one of the coating process, baking process and compaction operation is usually implemented by automated machine operation. For example, the coating process and baking process are performed by an automated assembly line, wherein the automated assembly line includes a coating machine for performing the coating process, an oven for controlling temperature and time to perform the automated baking process, and a compaction machine for performing the compaction operation, etc.; or, the coating process, baking process and compaction operation are performed by automated robot control.

[0195] Optionally, in a small-scale electrode sample preparation scenario, the coating process, baking process and compaction operation can also be implemented by manual operation; the electrode samples can also be prepared by automated machine operation combined with manual operation, and the preparation effect can be manually inspected after automated machine operation to achieve a more accurate process for preparing electrode samples, which is not limited here.

[0196] Step 630: Scan the first electrode surface of the electrode sample using an electron microscope to obtain a first energy spectrum.

[0197] Schematically, taking the a-plane of the pole piece sample as the first pole piece surface as an example, an electron microscope 100X is used to scan the energy spectrum of carbon to obtain a first energy spectrum corresponding to the a-plane.

[0198] Step 640, performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling.

[0199] The first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample.

[0200] In schematic form, after the scanning of step 630 is completed, taking the second pole piece surface as the b-side of the pole piece sample and the designated bonding surface as the iron plate as an example, the b-side is attached to the iron plate using PET tape, lightly pressed to adhere, and then peeled off slowly (<1cm / S) until the pole piece sample is completely peeled off. At this time, the second pole piece surface after peeling is obtained, such as called the c-side, and the side is opposite to the a-side.

[0201] Step 650, scanning the peeled second electrode surface using an electron microscope to obtain a second energy spectrum.

[0202] Schematically, the energy spectrum of carbon is also scanned on the c-plane using an electron microscope at 100X (the brightness and contrast are consistent with those when scanning the a-plane).

[0203] Step 660, obtaining a first carbon content corresponding to the first pole piece surface, and obtaining a second carbon content corresponding to the second pole piece surface after stripping.

[0204] The first carbon content is used to describe the content of carbon elements on the surface of the first electrode piece; the second carbon content is used to describe the content of carbon elements on the surface of the second electrode piece after stripping.

[0205] Schematically, the proportion of carbon element is calculated using Image Pro binarization, and the carbon content calculated on the a surface is recorded as α, and the carbon content calculated on the c surface is recorded as β.

[0206] Step 670: Obtain a migration ratio of the electrode additive based on the first carbon content and the second carbon content.

[0207] Among them, the migration ratio is used to characterize the migration of electrode additives during the preparation process of electrode samples.

[0208] Schematically, taking the electrode additive as a conductive agent as an example, the migration ratio of the conductive agent is calculated based on the above formula 1.

[0209] Optionally, when the migration ratio is less than a preset ratio threshold, it is considered that the coating state of the electrode sample has reached a preset standard, and the preparation of the electrode sample is completed.

[0210] Schematically, a lower migration ratio means that the conductive agent is more evenly distributed on the pole piece sample, which is very important for the overall performance and life of the battery. The preset migration ratio threshold may vary according to different battery technologies and applications. For example, if a battery requires high power output and long cycle life, the uniformity requirements for the distribution of the conductive agent will be more stringent, and the threshold of the migration ratio may be set lower. Typically, the preset migration ratio threshold may be within a few percentage points. For example, some high-performance batteries may require a migration ratio of no more than 1% to 2%. This means that the conductive agent is very evenly distributed on the pole piece, with almost no significant concentration gradient, etc.

[0211] It is worth noting that the above are merely illustrative examples and are not limited to the embodiments of the present application.

[0212] In summary, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive during the preparation of the electrode sample, thereby avoiding the problem of only being able to qualitatively analyze whether the electrode additive has migrated through electron microscope observation. With the help of the change of the main element "carbon element" that constitutes the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, making it easier to understand the coating uniformity of the electrode additive based on the migration ratio, and also to more accurately understand the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample.

[0213] Figure 7 is a structural block diagram of a migration quantification device for electrode additives provided by an exemplary embodiment of the present application, such as Figure 7 As shown, the device includes the following parts:

[0214] An acquisition module 710 is used to acquire a first carbon content corresponding to a first pole piece surface of a pole piece sample, wherein the first carbon content is used to describe the content of the carbon element on the first pole piece surface, and the pole piece sample is a sample obtained by coating a slurry on a substrate, and the slurry includes an electrode additive containing the carbon element;

[0215] A testing module 720 is used to perform a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling, wherein the first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample;

[0216] The acquisition module 710 is further used to acquire a second carbon content corresponding to the second pole piece surface after stripping, wherein the second carbon content is used to describe the content of carbon elements on the second pole piece surface after stripping;

[0217] The acquisition module 710 is further used to acquire the migration ratio of the electrode additive based on the first carbon content and the second carbon content, and the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

[0218] In an optional embodiment, the acquisition module 710 is also used to obtain the difference between the first carbon content and the second carbon content to obtain a first value; obtain the sum of the first carbon content and the second carbon content to obtain a second value; and use the quotient of the first value and the second value as the migration ratio of the electrode additive.

[0219] In an optional embodiment, the electrode additive includes at least one of a conductive agent and a binder; the conductive agent is used to provide conductive assistance to the electrode material, and the electrode material includes a positive electrode main powder and a negative electrode main powder; the binder is used to bond the electrode material, the conductive agent and the substrate.

[0220] In an optional embodiment, the acquisition module 710 is also used to scan the first pole piece surface of the pole piece sample through an electron microscope to obtain a first energy spectrum diagram, and the first energy spectrum diagram is used to describe the distribution of the carbon element on the first pole piece surface; based on the distribution amount of the carbon element on the first energy spectrum diagram, the first carbon content corresponding to the first pole piece surface is obtained.

[0221] In an optional embodiment, the acquisition module 710 is also used to perform binarization processing on the first energy spectrum diagram to obtain a first grayscale energy spectrum diagram, in which the pixel value of the display area corresponding to the carbon element in the first grayscale energy spectrum diagram is a first value; obtain the area ratio between the area of ​​the first display area in the first grayscale energy spectrum diagram where the pixel value is the first value and the area of ​​the second display area of ​​the first grayscale energy spectrum diagram as the first carbon content corresponding to the first pole piece surface.

[0222] In an optional embodiment, the acquisition module 710 is also used to scan the second pole piece surface after peeling through an electron microscope using a first brightness and a first contrast to obtain a second energy spectrum diagram corresponding to the second pole piece surface after peeling, and the second energy spectrum diagram is used to describe the distribution of the carbon element on the second pole piece surface after peeling; wherein the first carbon content is determined by scanning the first pole piece surface through the electron microscope using the first brightness and the first contrast; based on the distribution amount of the carbon element on the second energy spectrum diagram, the second carbon content corresponding to the second pole piece surface after peeling is obtained.

[0223] In an optional embodiment, the acquisition module 710 is also used to perform binarization processing on the second energy spectrum to obtain a second grayscale energy spectrum, in which the pixel value of the display area corresponding to the carbon element in the second grayscale energy spectrum is a first value; obtain the area ratio between the area of ​​the third display area in the second grayscale energy spectrum where the pixel value is the first value and the area of ​​the fourth display area of ​​the second grayscale energy spectrum as the second carbon content corresponding to the second electrode surface after peeling.

[0224] In an optional embodiment, the test module 720 is also used to stick the second pole piece surface of the pole piece sample on a designated bonding surface through adhesive tape; peel off the second pole piece surface from the designated bonding surface at a first speed to obtain the peeled second pole piece surface.

[0225] In an optional embodiment, the acquisition module 710 is also used to obtain the slurry, which is obtained by uniformly mixing the positive electrode main powder, the electrode additive, the glue and the solution in a preset proportion; the slurry is coated on the substrate, and the electrode sample is obtained by baking.

[0226] In an optional embodiment, the acquisition module 710 is also used to coat the substrate on both sides with the slurry and obtain the pole piece sample by baking; or, coat the substrate on one side with the slurry and obtain the pole piece sample by baking.

[0227] In an optional embodiment, the acquisition module 710 is also used to perform a region division operation on the electrode sample to obtain at least two first sub-regions in the first electrode surface, and at least two second sub-regions in the second electrode surface; the at least two first sub-regions correspond one-to-one to the at least two second sub-regions; obtain the first sub-carbon content corresponding to the at least two first sub-regions, and obtain the second sub-carbon content corresponding to the at least two second sub-regions; based on the relative relationship between the first sub-region and the second sub-region, obtain the regional migration ratio corresponding to the at least two first sub-regions; based on the at least two regional migration ratios, obtain the migration ratio of the electrode additive.

[0228] In summary, the migration ratio of the electrode additive is analyzed by the first carbon content and the second carbon content, so as to quantify the migration of the electrode additive during the preparation of the electrode sample, thereby avoiding the problem of only being able to qualitatively analyze whether the electrode additive has migrated through electron microscope observation. With the help of the change of the main element "carbon element" that constitutes the electrode additive, the migration ratio is qualitatively and quantitatively analyzed, thereby improving the analysis precision and accuracy of the migration process of the electrode additive, making it easier to understand the coating uniformity of the electrode additive based on the migration ratio, and also to more accurately understand the preparation excellence of the electrode sample, which is beneficial to improving the preparation quality of the electrode sample.

[0229] It should be noted that the migration quantification device of the electrode additive provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the migration quantification device of the electrode additive provided in the above embodiment and the migration quantification method embodiment of the electrode additive belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0230] Figure 8 The block diagram of the structure of an electronic device 800 provided by an exemplary embodiment of the present application is shown. The electronic device 800 may be a portable mobile terminal, such as a smart phone, a vehicle-mounted terminal, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 player (Moving Picture Experts Group Audio Layer IV), a laptop computer or a desktop computer. The electronic device 800 may also be called a user device, a portable terminal, a laptop terminal, a desktop terminal or other names.

[0231] Typically, the electronic device 800 includes a processor 801 and a memory 802 .

[0232] The processor 801 may include one or more processing cores. The processor 801 may also include a main processor and a coprocessor.

[0233] The memory 802 may include one or more computer-readable storage media, which may be non-transient. The memory 802 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transient computer-readable storage medium in the memory 802 is used to store at least one instruction, which is used to be executed by the processor 801 to implement the migration quantification method of the electrode additive provided by the method embodiment of the present application.

[0234] In some embodiments, the electronic device 800 further includes one or more sensors, including but not limited to: a proximity sensor, a gyroscope sensor, and a pressure sensor.

[0235] In some embodiments, the electronic device 800 further includes other components, which can be understood by those skilled in the art. Figure 8 The structure shown in the figure does not constitute a limitation on the electronic device 800, and may include more or less components than those shown in the figure, or combine some components, or adopt a different component arrangement.

[0236] The embodiment of the present application also provides a computer device, which can be implemented as follows: Figure 1 The computer device includes a processor and a memory, wherein at least one instruction, at least one program, code set or instruction set is stored in the memory, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the migration quantification method of the electrode additive provided by each of the above method embodiments.

[0237] An embodiment of the present application also provides a computer-readable storage medium, on which is stored at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the migration quantification method of electrode additives provided in the above-mentioned method embodiments.

[0238] The embodiments of the present application also provide a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the migration quantification method of the electrode additive described in any of the above embodiments.

[0239] Optionally, the computer readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a solid state drive (SSD), or an optical disk. Among them, the random access memory may include a resistance random access memory (ReRAM) and a dynamic random access memory (DRAM). The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0240] Those skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or by a program to instruct the relevant hardware to complete, and the program can be stored in a computer-readable storage medium, and the above-mentioned storage medium can be a read-only memory, a disk or an optical disk, etc. The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for quantifying migration of electrode additives, characterized in that: The method comprises: Obtaining a first carbon content corresponding to a first pole piece surface of a pole piece sample, wherein the first carbon content is used to describe the content of the carbon element on the first pole piece surface, wherein the pole piece sample is a sample obtained by coating a slurry on a substrate, wherein the slurry includes an electrode additive containing the carbon element; Performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling, wherein the first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample; Obtaining a second carbon content corresponding to the second pole piece surface after stripping, wherein the second carbon content is used to describe the content of carbon elements on the second pole piece surface after stripping; The migration ratio of the electrode additive is obtained based on the first carbon content and the second carbon content, and the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

2. The method according to claim 1, characterized in that: The obtaining the migration ratio of the electrode additive based on the first carbon content and the second carbon content includes: Obtaining a difference between the first carbon content and the second carbon content to obtain a first value; Obtaining a sum of the first carbon content and the second carbon content to obtain a second value; The quotient of the first value and the second value is taken as the migration ratio of the electrode additive.

3. The method according to claim 1, characterized in that The electrode additive includes at least one of a conductive agent and a binder; The conductive agent is used to provide conductive assistance to the electrode material, and the electrode material includes a positive electrode main powder and a negative electrode main powder; the binder is used to bond the electrode material, the conductive agent and the substrate.

4. The method according to any one of claims 1 to 3, characterized in that: The obtaining of a first carbon content corresponding to a first pole piece surface of the pole piece sample comprises: Scanning the first pole piece surface of the pole piece sample through an electron microscope to obtain a first energy spectrum diagram, wherein the first energy spectrum diagram is used to describe the distribution of the carbon element on the first pole piece surface; Based on the distribution amount of the carbon element on the first energy spectrum, the first carbon content corresponding to the first pole piece surface is obtained.

5. The method according to claim 4, characterized in that The obtaining, based on the distribution of the carbon element on the first energy spectrum, the first carbon content corresponding to the first pole piece surface comprises: Performing binarization processing on the first energy spectrum to obtain a first grayscale energy spectrum, wherein the pixel value of the display area corresponding to the carbon element in the first grayscale energy spectrum is a first value; The area ratio between the area of ​​a first display area in the first grayscale energy spectrum in which pixel values ​​are first values ​​and the area of ​​a second display area in the first grayscale energy spectrum is obtained as the first carbon content corresponding to the first pole piece surface.

6. The method according to any one of claims 1 to 3, characterized in that: The obtaining of the second carbon content corresponding to the second electrode sheet surface after the stripping includes: Scanning the second pole piece surface after stripping with an electron microscope using a first brightness and a first contrast to obtain a second energy spectrum corresponding to the second pole piece surface after stripping, wherein the second energy spectrum is used to describe the distribution of the carbon element on the second pole piece surface after stripping; wherein the first carbon content is determined by scanning the first pole piece surface with the electron microscope using the first brightness and the first contrast; Based on the distribution amount of the carbon element on the second energy spectrum, the second carbon content corresponding to the second pole piece surface after stripping is obtained.

7. The method according to claim 6, characterized in that The obtaining, based on the distribution amount of the carbon element on the second energy spectrum, the second carbon content corresponding to the second pole piece surface after stripping includes: Performing binarization processing on the second energy spectrum to obtain a second grayscale energy spectrum, wherein the pixel value of the display area corresponding to the carbon element in the second grayscale energy spectrum is a first value; The area ratio between the area of ​​the third display area in the second grayscale energy spectrum whose pixel value is the first value and the area of ​​the fourth display area in the second grayscale energy spectrum is obtained as the second carbon content corresponding to the second electrode surface after peeling.

8. The method according to any one of claims 1 to 3, characterized in that: The step of performing a peeling test on the second pole piece surface of the pole piece sample to obtain the peeled second pole piece surface includes: Sticking the second pole piece surface of the pole piece sample on the designated bonding surface by adhesive tape; The second pole piece surface is peeled off from the designated bonding surface at a first speed to obtain the peeled second pole piece surface.

9. The method according to any one of claims 1 to 3, characterized in that: Before obtaining the first carbon content corresponding to the first pole piece surface of the pole piece sample, the method further includes: Obtaining the slurry, wherein the slurry is obtained by uniformly mixing the positive electrode main powder, the electrode additive, the glue and the solution according to a preset ratio; The slurry is coated on the substrate, and the pole piece sample is obtained by baking.

10. The method according to claim 9, characterized in that The method of coating the slurry on the substrate and baking to obtain the pole piece sample comprises: The substrate is coated with the slurry on both sides and the pole piece sample is obtained by baking; or, The substrate is coated with the slurry on one side and then baked to obtain the pole piece sample.

11. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Performing a region division operation on the pole piece sample to obtain at least two first sub-regions in the first pole piece surface and at least two second sub-regions in the second pole piece surface; the at least two first sub-regions correspond one to one with the at least two second sub-regions; Obtaining first sub-carbon contents corresponding to the at least two first sub-regions respectively, and obtaining second sub-carbon contents corresponding to the at least two second sub-regions; Based on the relative relationship between the first sub-region and the second sub-region, acquiring the region migration ratios respectively corresponding to the at least two first sub-regions; The migration ratio of the electrode additive is obtained based on the at least two region migration ratios.

12. A migration quantification device for electrode additives, characterized in that: The device comprises: an acquisition module, used for acquiring a first carbon content corresponding to a first pole piece surface of a pole piece sample, wherein the first carbon content is used for describing the content of the carbon element on the first pole piece surface, wherein the pole piece sample is a sample obtained by coating a slurry on a substrate, wherein the slurry includes an electrode additive containing the carbon element; A testing module, used for performing a peeling test on the second pole piece surface of the pole piece sample to obtain the second pole piece surface after peeling, wherein the first pole piece surface and the second pole piece surface are two opposite surfaces on the pole piece sample; The acquisition module is further used to acquire a second carbon content corresponding to the second pole piece surface after the stripping, wherein the second carbon content is used to describe the content of carbon elements on the second pole piece surface after the stripping; The acquisition module is also used to acquire the migration ratio of the electrode additive based on the first carbon content and the second carbon content, and the migration ratio is used to characterize the migration of the electrode additive during the preparation process of the electrode sample.

13. A computer device, characterized in that: The computer device includes a processor and a memory, wherein the memory stores at least one program, and the at least one program is loaded and executed by the processor to implement the migration quantification method of the electrode additive according to any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that: The storage medium stores at least one program, and the at least one program is loaded and executed by a processor to implement the migration quantification method of an electrode additive as claimed in any one of claims 1 to 11.

15. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the migration quantification method of an electrode additive as claimed in any one of claims 1 to 11.

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