Detection method for foil ash of electrode foil

Abstract

The invention discloses an electrode foil ash detection method which comprises the following steps: pretreatment: taking two pieces of electrode foil with the same area, and carrying out ultrasonic cleaning to obtain a first solution and a second solution after cleaning; foil ash digestion: adding a certain amount of hydrochloric acid into the first solution, standing at normal temperature, adding a certain amount of hydrochloric acid and nitric acid into the second solution, and standing at high temperature; foil ash detection: the aluminum content of the solution in the first container is wt1, and the aluminum content of the solution in the second container is wt2; and determining the content of metal aluminum and aluminum oxide in the foil ash. According to the technical scheme provided by the embodiment of the invention, the foil ash on the surface of the electrode foil is qualitatively and quantitatively analyzed, the composition of the foil ash is judged by utilizing the difference of the digestion conditions of aluminum and aluminum oxide according to the composition of the foil ash, and the method is simple to operate, has relatively high accuracy and is suitable for popularization and application. Scientific management and control of the electrode foil material are realized, so that the probability of breakdown or short circuit of the aluminum electrolytic capacitor is reduced, and the target of improving the yield of the capacitor is finally realized.

Description

Technical Field

[0001] The present invention generally relates to the field of aluminum electrolytic capacitors, and particularly to a method for detecting electrode foil ash. Background Art

[0002] The electrode foil is a core component of an aluminum electrolytic capacitor and an important factor determining the stability of the aluminum electrolytic capacitor. The electrode foil is composed of a metal aluminum foil loaded with an alumina dielectric layer. Among them, the cutting of the electrode foil is an important process in the production of capacitors. After cutting the electrode foil into a certain width, it can be wound into a capacitor core. During the cutting process of the electrode foil, the oxide film and the residual aluminum core will deform under stress, generating debris foil ash. The main components of the foil ash are alumina, or aluminum, or a combination of alumina and aluminum. When the foil ash is aluminum, it may cause the breakdown of the electrode foil in the capacitor, resulting in the failure of the capacitor; when the foil ash is alumina, the contact resistance falling on the electrode foil may change, resulting in a decline in the performance of the capacitor. Therefore, it is of great significance to test the content of the foil ash and analyze the composition of the foil ash. However, the existing foil ash detection methods are usually based on the weighing method, such as patent CN119223802A, and this weighing method cannot determine the composition of the foil ash. Summary of the Invention

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a method for detecting electrode foil ash.

[0004] In a first aspect, a method for detecting electrode foil ash is provided, and the method includes: Pretreatment: Take two electrode foils with the same area and place them in a first container and a second container respectively for ultrasonic cleaning. After cleaning, let them stand still and take out the electrode foils to obtain a first solution and a second solution; Foil ash digestion: Add a certain amount of hydrochloric acid to the first solution and let it stand still at room temperature for a certain time. Add a certain amount of hydrochloric acid and nitric acid to the second solution and let it stand still at a high temperature until the foil ash in the second solution is completely dissolved; Foil ash detection: Make the solutions in the first container and the second container up to 1 L in volume and test the aluminum content in the solutions respectively. Among them, the aluminum content in the solution in the first container is wt1, and the aluminum content in the solution in the second container is wt2; Determine the content of metallic aluminum and alumina in the foil ash: The content of metallic aluminum in the foil ash is wt1, and the content of alumina is wt3, where wt3 = wt2 - wt1.

[0005] As an implementable way, add a certain amount of hydrochloric acid to the first solution and let it stand still at 15 - 40 °C for at least 20 min to completely dissolve the metallic aluminum component in the first solution.

[0006] As an implementable method, before the solution in the first container is made up to 1 L, it further includes: placing all the components in the first container in a high-speed centrifuge and rotating at 5000 - 9000 revolutions per minute for 5 - 25 minutes to cause the undissolved foil ash in the first container to settle, and taking out the solution in the first container.

[0007] As an implementable method, a certain amount of hydrochloric acid and nitric acid are added to the second solution, and the reaction is carried out at 150 - 180 °C for at least 8 hours to completely dissolve the foil ash in the second solution.

[0008] As an implementable method, ultrasonic cleaning is carried out using an ultrasonic cleaner, the cleaning time is 2 - 15 minutes, the cleaning power is 0.5 kw, the ultrasonic frequency is 10 KHz, and the cleaning temperature is 5 - 35 °C.

[0009] As an implementable method, the measurement of the aluminum content in the solution is determined by an inductively coupled plasma emission spectrometer.

[0010] As an implementable method, the integration time of the equipment is: 15 s for the short wave, 5 s for the long wave, and the auxiliary gas flow is 0.5 L / min.

[0011] According to the technical solution provided by the embodiments of the present application, through qualitative and quantitative analysis of the foil ash on the surface of the electrode foil, and based on the differences in the digestion conditions of aluminum and aluminum oxide according to the composition of the foil ash, the composition of the foil ash is judged, and this method is simple to operate and has high accuracy. Further, the present application can determine the content of the foil ash on the surface of the electrode foil through the above detection method, provides a solution for detecting and screening non-conforming electrode foil products, and at the same time realizes scientific control of the electrode foil material, thereby reducing the probability of breakdown or short circuit of aluminum electrolytic capacitors, and finally achieving the goal of improving the finished product rate of capacitors. Description of the Drawings

[0012] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent: Figure 1 It is a flow chart of the detection method for the foil ash of the electrode foil in this embodiment. Detailed Embodiments

[0013] The following further describes the present application in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings.

[0014] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0015] Please refer to Figure 1 , this embodiment provides a method for detecting the ash of an electrode foil, and the method includes: S1: Pretreatment: Take two electrode foils with the same area and place them in a first container and a second container respectively for ultrasonic cleaning. After cleaning, let them stand still and take out the electrode foils therein to obtain a first solution and a second solution; S2: Ash digestion: Add a certain amount of hydrochloric acid to the first solution and let it stand at room temperature for a certain time. Add a certain amount of hydrochloric acid and nitric acid to the second solution and let it stand at high temperature until the ash in the second solution is completely dissolved; S3: Ash detection: Dilute the solutions in the first container and the second container to 1 L, and respectively test the aluminum content in the solutions. Among them, the aluminum content of the solution in the first container is wt1, and the aluminum content of the solution in the second container is wt2; S4: Determine the content of metallic aluminum and aluminum oxide in the ash: The content of metallic aluminum in the ash is wt1, and the content of aluminum oxide is wt3, where wt3 = wt2 - wt1.

[0016] The detection method provided by the present application qualitatively and quantitatively analyzes the ash on the surface of the electrode foil, judges the composition of the ash according to the difference in the digestion conditions of aluminum and aluminum oxide based on the composition of the ash, and this method is simple to operate and has high accuracy. Further, the present application can determine the content of the ash on the surface of the electrode foil through the above detection method, provides a solution for detecting and screening unqualified electrode foils, and at the same time realizes scientific control of the electrode foil material, thereby reducing the probability of breakdown or short circuit of aluminum electrolytic capacitors and finally achieving the goal of improving the yield of capacitor products.

[0017] In the above method, first, two electrode foils with the same area and the same sampling conditions are provided. The two electrode foils are respectively placed in different containers for ultrasonic cleaning. There is the same volume of pure water in the containers. Preferably, electrode foils with an area of 5 * 5 cm are selected, and 50 ml of pure water is placed in the containers. The selection of the appropriate area of the electrode foil can not only reflect the situation of the ash on the electrode foil but also fully digest the corresponding aluminum or aluminum oxide in the subsequent digestion reaction, so that the measured data truly reflects the situation of the ash on the electrode foil. Place the two electrode foils in an ultrasonic cleaner for cleaning. The ash on the cleaned electrode foil falls into the pure water. Subsequently, let the containers containing the electrode foils stand still, so that the ash shed from the surface of the electrode foil settles to the bottom of the solution. Then take out the electrode foils in the containers to obtain the first solution and the second solution with ash.

[0018] Preferably, ultrasonic cleaning is carried out using an ultrasonic cleaning machine. The cleaning time is 2 - 15 minutes, the cleaning power is 0.5 kW, the ultrasonic frequency is 10 KHz, and the cleaning temperature is 5 - 35 °C. The duration of ultrasonic cleaning is determined according to the ash on the electrode foil. Generally, it is carried out at room temperature to ensure that the ash on the electrode foil falls off into pure water.

[0019] Reference Figure 1 As shown, subsequently, the digestion of aluminum or aluminum oxide is carried out in the first solution and the second solution under different conditions. For example, a certain amount of hydrochloric acid is added to the first solution and the reaction is carried out at room temperature. A certain amount of hydrochloric acid and nitric acid are added to the second solution and the reaction is carried out at high temperature. This step utilizes the difference in the digestion conditions of aluminum and aluminum oxide. Since aluminum is an active metal, it easily reacts with hydrochloric acid at room temperature, while most of the aluminum oxide in the electrode foil is γ, γ'-aluminum oxide, which is basically insoluble in hydrochloric acid at room temperature and can be dissolved in a mixed solution of hydrochloric acid and nitric acid at high temperature. Therefore, the above difference is used to carry out the digestion of the first solution and the second solution under different conditions. In the first solution under the condition of hydrochloric acid at room temperature, only aluminum will dissolve into the solution, so the content of aluminum in the solution can be detected; in the second solution under the condition of a mixed solution of hydrochloric acid and nitric acid at high temperature, both aluminum and aluminum oxide will dissolve completely, so the sum of the contents of aluminum and aluminum oxide in the solution can be detected. By calculation, the contents of aluminum and aluminum oxide can be obtained respectively, and the content of the ash on the electrode foil can be obtained more accurately, providing a new and evidence-based idea for the electrode foil manufacturer to analyze the cause of the ash generation.

[0020] Preferably, a certain amount of hydrochloric acid is added to the first solution and left standing for at least 20 minutes at 15 - 40 °C to completely dissolve the metallic aluminum component in the first solution. Ensure that the first solution reacts fully at room temperature.

[0021] Preferably, a certain amount of hydrochloric acid and nitric acid are added to the second solution and reacted for at least 8 hours at 150 - 180 °C to completely dissolve the ash in the second solution. A certain amount of nitric acid and hydrochloric acid are added to the second solution, and a high-temperature environment of 150 - 180 °C is provided for reaction for 8 - 24 hours to completely dissolve the ash, ensuring that both aluminum and aluminum oxide in the second solution are completely dissolved.

[0022] After the above reaction, the solution is fixed to the same volume and then detected. In this embodiment, preferably, both the first solution and the second solution after the reaction are fixed to 1 L, and then an inductively coupled plasma emission spectrometer is used to test and detect the corresponding content by ICP-OES (inductively coupled plasma emission spectrometry). Before the solution in the first container is fixed, all the components in the first container need to be placed in a high-speed centrifuge and rotated at 5000 - 9000 revolutions per minute for 5 - 25 minutes to make the undissolved foil ash in the first container settle, and then the solution in the first container is taken out. Since the foil ash in the first container cannot be completely dissolved under the condition of normal-temperature hydrochloric acid, before detection, the undissolved solid in the first container needs to be taken out so that the detected content of the solution is the content of dissolved aluminum. The aluminum content in this first container is wt1.

[0023] The solution in the second container is completely dissolved under the conditions of high-temperature hydrochloric acid and nitric acid. Therefore, the solution in the second container is directly fixed to 1 L, and the aluminum content in the solution is detected by using the same ICP-OES (inductively coupled plasma emission spectrometry) as above. The aluminum content in this second container is wt2, where the aluminum content in the second container includes both metallic aluminum and aluminum oxide.

[0024] In the above test method, the integration time of the equipment used is: 15 s for the short wave, 5 s for the long wave, and 0.5 L / min for the auxiliary gas flow. Since ICP-OES converts the test solution into an aerosol through an atomizer, in an argon plasma at a high temperature (about 10000 K), aluminum elements are atomized and excited to a high energy state. When the excited aluminum atoms return to the ground state, they emit light of a specific wavelength. For example, the sensitive spectral lines of aluminum are at 167 nm (short wave) or 396 nm (long wave). Different wavelengths of light are separated by a spectroscopic system, and a detector measures the intensity of specific spectral lines, and the aluminum concentration is calculated through a calibration curve.

[0025] Among them, the intensity of the short-wave spectral line of aluminum is weak and is easily affected by background interference. Therefore, the short-wave integration time is set to 15 s, which can improve the signal-to-noise ratio and ensure the stable detection of weak signals; the intensity of the long-wave spectral line is high and the interference is less. The integration time is set to be shortened to 5 seconds, which can avoid signal saturation and improve the analysis efficiency at the same time.

[0026] The measurement result of the solution in the first container above is wt1, and the measurement result of the solution in the second container is wt2. Since only metallic aluminum in the foil ash can be dissolved during normal-temperature digestion of the foil ash, and aluminum oxide cannot be dissolved, then wt1 is the content of metallic aluminum in the foil ash on the surface of the sampling electrode foil. During high-temperature digestion of the foil ash, both metallic aluminum and aluminum oxide in the foil ash will be dissolved, so wt2 is the total content of metallic aluminum and aluminum oxide in the foil ash on the surface of the sampling electrode foil, and wt2 - wt1 = wt3 is the content of aluminum oxide in the foil ash on the surface of the sampling electrode foil.

[0027] In the actual process of manufacturing capacitors, operations such as cutting, winding, and impregnation can cause large unstable particles on the surface of the electrode foil to fall off, not just natural shedding. The above steps can determine the weight and composition of the foil ash on the surface of the sampled electrode foil, more accurately measure the foil ash content and composition of the electrode foil, conduct qualitative and quantitative analysis of the foil ash, and provide new ideas and references for the next operation and corresponding process steps.

[0028] For example, if the aluminum content in the foil ash is relatively high, it indicates that there is a possibility of surface structure peeling off in the etched foil selected during the manufacturing of the electrode foil; if the alumina content in the foil ash is relatively high, it indicates that the foil ash may have fallen off from the alumina structure on the surface of the electrode foil, then the control of mechanical strength in this manufacturing process is poor and the process needs to be appropriately adjusted.

[0029] In summary, the detection scheme provided by this application not only helps to improve the yield of capacitors, but also is more conducive to analyzing problems in the electrode foil production process, thereby enhancing the overall technical level of the industry.

[0030] The following gives the specific implementation methods for detecting the foil ash on the surface of the electrode foil: Example 1: The specific operation steps are as follows: Pretreatment of the electrode foil: Take two pieces of grade A electrode foil with a size of 5*5 cm, weigh them to be 0.095 g, and then place them in the first container and the second container respectively for later use; add 50 ml of pure water to each of the two containers to ensure that the electrode foil is completely immersed in the pure water; place the two containers in an ultrasonic cleaner and clean for 5 minutes at a cleaning temperature of 30°C; then, take out the two containers from the ultrasonic cleaner and let them stand for 1 hour to allow the aluminum powder that has fallen off the surface of the electrode foil to settle to the bottom of the solution; then, take out the electrode foil.

[0031] Normal-temperature digestion and detection of the foil ash: Add 6 ml of hydrochloric acid to the first container, let it stand at 30°C for 20 minutes, place all the components in the first container in a high-speed centrifuge at 8000 revolutions per minute for 5 minutes, and then take out the solution and make it up to 1 L, and use ICP-OES to test the aluminum content wt1 in the solution to be 0.05%.

[0032] High-temperature digestion and detection of the foil ash: Add 6 ml of hydrochloric acid and 2 ml of nitric acid to the second container, and place it at 170°C for 8 hours. Make up the solution in the second container to 1 L, and use ICP-OES to test the aluminum content wt2 in the solution to be 0.29%.

[0033] Calculation: wt1 is the content of metallic aluminum in the foil ash on the surface of the 5*5 cm grade A electrode foil. The foil ash wt2 is the total content of metallic aluminum and alumina, and wt3 = wt2 - wt1 = 0.24% is the content of alumina in the foil ash on the surface of the 5*5 cm electrode foil.

[0034] Example 2: The specific operation steps are as follows: Pretreatment of electrode foil: Take two 5*5 cm grade B electrode foils, weigh 0.103 g, and place them in the first container and the second container for later use. Add 50 ml of pure water to each of the two containers to ensure that the electrode foils are completely immersed in the pure water. Place the two containers in an ultrasonic cleaner and clean for 15 min at a cleaning temperature of 15 °C. Subsequently, take the two containers out of the ultrasonic cleaner and let them stand for 2 h so that the aluminum powder detached from the surface of the electrode foils settles to the bottom of the solution. Then, take out the electrode foils.

[0035] Ambient-temperature digestion and detection of foil ash: Add 9 ml of hydrochloric acid to the first container and let it stand at 30 °C for 10 min. Place all the components in the first container in a high-speed centrifuge at 7000 rpm for 10 min, and then take out the solution and make up the volume to 1 L. Use ICP-OES to test the aluminum content wt1 in the solution, which is 0.08%.

[0036] High-temperature digestion and detection of foil ash: Add 9 ml of hydrochloric acid and 3 ml of nitric acid to the second container and place it at 180 °C for 20 h. Make up the volume of the solution in the second container to 1 L, and use ICP-OES to test the aluminum content wt2 in the solution, which is 0.27%.

[0037] Calculation: wt1 is the content of metallic aluminum in the foil ash on the surface of the 5*5 cm grade B electrode foil. Foil ash wt2 is the total content of metallic aluminum and aluminum oxide, and wt3 = wt2 - wt1 = 0.19% is the content of aluminum oxide in the foil ash on the surface of the 5*5 cm electrode foil.

[0038] Example 3: The specific operation steps are as follows: Pretreatment of electrode foil: Take two 5*5 cm grade C electrode foils, weigh 0.0898 g, and place them in the first container and the second container for later use. Add 50 ml of pure water to each of the two containers to ensure that the electrode foils are completely immersed in the pure water. Place the two containers in an ultrasonic cleaner and clean for 2 min at a cleaning temperature of 35 °C. Subsequently, take the two containers out of the ultrasonic cleaner and let them stand for 1 h so that the aluminum powder detached from the surface of the electrode foils settles to the bottom of the solution. Then, take out the electrode foils.

[0039] Ambient-temperature digestion and detection of foil ash: Add 2 ml of hydrochloric acid to the first container and let it stand at 30 °C for 20 min. Place all the components in the first container in a high-speed centrifuge at 8000 rpm for 5 min, and then take out the solution and make up the volume to 1 L. Use ICP-OES to test the aluminum content wt1 in the solution, which is 0.03%.

[0040] High-temperature digestion and detection of foil ash: Add 2 ml of hydrochloric acid and 0.5 ml of nitric acid to the second container, and place it at 170 °C for 24 h. Dilute the solution in the second container to 1 L, and use ICP-OES to measure the aluminum content wt2 in the solution to be 0.20%.

[0041] Calculation: wt1 is the content of metallic aluminum in the foil ash on the surface of the 5*5 cm C electrode foil. Foil ash wt2 is the total content of metallic aluminum and aluminum oxide, and wt3 = wt2 - wt1 = 0.17% is the content of aluminum oxide in the foil ash on the surface of the 5*5 cm electrode foil.

[0042] Example 4: A method for detecting the foil ash on the surface of an electrode foil, the specific operation steps are as follows: Pretreatment of the electrode foil: Take two 5*5 cm grade D electrode foils, weigh them to be 1.08 g, and place them in the first container and the second container for use respectively. Add 50 ml of pure water to each container to ensure that the electrode foils are completely immersed in the pure water. Place the two containers in an ultrasonic cleaner and clean for 5 min at a cleaning temperature of 30 °C. Subsequently, take out the two containers from the ultrasonic cleaner and let them stand for 1 h to allow the aluminum powder that has fallen off the surface of the electrode foils to settle to the bottom of the solution. Subsequently, take out the electrode foils.

[0043] Normal-temperature digestion and detection of foil ash: Add 6 ml of hydrochloric acid to the first container and let it stand at 30 °C for 20 min. Place all the components in the first container in a high-speed centrifuge at 7000 rpm for 15 min, and then take out the solution and dilute it to 1 L, and use ICP-OES to measure the aluminum content wt1 in the solution to be 0.02%.

[0044] High-temperature digestion and detection of foil ash: Add 6 ml of hydrochloric acid and 2 ml of nitric acid to the second container, and place it at 180 °C for 12 h. Dilute the solution in the second container to 1 L, and use ICP-OES to measure the aluminum content wt2 in the solution to be 0.26%.

[0045] Calculation: wt1 is the content of metallic aluminum in the foil ash on the surface of the 5*5 cm D electrode foil. Foil ash wt2 is the total content of metallic aluminum and aluminum oxide, and wt3 = wt2 - wt1 = 0.24% is the content of aluminum oxide in the foil ash on the surface of the 5*5 cm electrode foil.

[0046] The above detection method can qualitatively and quantitatively detect the foil ash of the electrode foil, and accurately determine the content of the foil ash. It provides a solution for aluminum electrolytic capacitor manufacturers to timely screen out unqualified electrode foils with more foil ash, further realizes the scientific control of electrode foil materials, thereby reducing the probability of breakdown and short circuit of aluminum electrolytic capacitors, and finally achieving the goal of improving the yield of capacitor products.

[0047] It should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the above text is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention; the terms "inner" and "outer" refer to the inside and outside relative to the contour of each component itself. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0048] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "above-mentioned", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation other than the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding interpretations are made for the spatial relative descriptions used here.

[0049] The above description is only the preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. A method for detecting the ash of an electrode foil, characterized in that, Including: Pretreatment: Take two electrode foils with the same area and place them in the first container and the second container respectively for ultrasonic cleaning. After cleaning, let them stand still and take out the electrode foils to obtain the first solution and the second solution. Ash digestion of foil: Add a certain amount of hydrochloric acid to the first solution and let it stand still at room temperature for a certain time. Add a certain amount of hydrochloric acid and nitric acid to the second solution and let it stand still at high temperature until the ash of the foil in the second solution is completely dissolved. Ash detection of foil: Dilute the solutions in the first container and the second container to 1 L and measure the aluminum content in the solutions respectively. Among them, the aluminum content in the solution in the first container is wt1, and the aluminum content in the solution in the second container is wt2. Determine the content of metallic aluminum and aluminum oxide in the foil ash: The content of metallic aluminum in the foil ash is wt1, and the content of aluminum oxide is wt3, where wt3 = wt2 - wt1.

2. The detection method of the electrode foil ash according to claim 1, characterized in that Add a certain amount of hydrochloric acid to the first solution and let it stand still at 15 - 40 °C for at least 20 min to completely dissolve the metallic aluminum component in the first solution.

3. The detection method of the electrode foil ash according to claim 2, characterized in that, Before diluting the solution in the first container to 1 L, it also includes: Place all the components in the first container in a high-speed centrifuge and rotate it at 5000 - 9000 revolutions per minute for 5 - 25 min to make the undissolved ash of the foil in the first container settle, and take out the solution in the first container.

4. The detection method of the electrode foil ash according to claim 1, characterized in that Add a certain amount of hydrochloric acid and nitric acid to the second solution and react it at 150 - 180 °C for at least 8 h to completely dissolve the ash of the foil in the second solution.

5. The detection method of the electrode foil ash according to claim 1, characterized in that The ultrasonic cleaning is carried out by an ultrasonic cleaner with a cleaning time of 2 - 15 min, a cleaning power of 0.5 kw, an ultrasonic frequency of 10 KHz, and a cleaning temperature of 5 - 35 °C.

6. The detection method of the electrode foil ash according to claim 1, wherein The measurement of the aluminum content in the solution is determined by an inductively coupled plasma emission spectrometer.

7. The detection method of the electrode foil ash according to claim 6, wherein The integration time of the equipment is: 15 s for the short wave, 5 s for the long wave, and the auxiliary gas flow is 0.5 L / min.

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