CN117711828A - Aluminum electrolytic capacitor anode sintered foil and preparation method thereof - Google Patents
Aluminum electrolytic capacitor anode sintered foil and preparation method thereof Download PDFInfo
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- CN117711828A CN117711828A CN202311849951.1A CN202311849951A CN117711828A CN 117711828 A CN117711828 A CN 117711828A CN 202311849951 A CN202311849951 A CN 202311849951A CN 117711828 A CN117711828 A CN 117711828A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 186
- 239000011888 foil Substances 0.000 title claims abstract description 121
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 115
- 239000003990 capacitor Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 108
- 238000000576 coating method Methods 0.000 claims abstract description 84
- 239000011248 coating agent Substances 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 61
- 238000005245 sintering Methods 0.000 claims abstract description 54
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 239000002002 slurry Substances 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 10
- 239000012300 argon atmosphere Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 7
- 239000001099 ammonium carbonate Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 235000013877 carbamide Nutrition 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 3
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- 239000010410 layer Substances 0.000 description 58
- 230000000052 comparative effect Effects 0.000 description 13
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
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- 230000006978 adaptation Effects 0.000 description 2
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- 239000012298 atmosphere Substances 0.000 description 1
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Abstract
The present disclosure provides an aluminum electrolytic capacitor anode sintered foil and a preparation method thereof, and relates to the technical field of capacitors. The preparation method of the anode sintered foil of the aluminum electrolytic capacitor comprises the following steps: coating aluminum powder slurry on the surface of an aluminum foil substrate, and drying to obtain the aluminum foil substrate with the target coating on the surface; generating a pore-forming agent layer on the target coating to obtain an aluminum foil substrate with the target coating and the pore-forming agent layer on the surface; winding the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain an aluminum roll; sintering the aluminum coil to prepare an aluminum electrolytic capacitor anode sintered foil; wherein, in the sintering process, the pore-forming agent layer is decomposed into gas by heating. The present disclosure can improve the quality of aluminum electrolytic capacitor anode sintered foil.
Description
Technical Field
The disclosure relates to the technical field of capacitors, in particular to a preparation method of an aluminum electrolytic capacitor anode sintered foil and the aluminum electrolytic capacitor anode sintered foil.
Background
Electrolytic capacitors, which are important devices in the electronics industry, have been widely used in many fields such as aerospace, rail transit, industrial control, electronic circuits, new energy sources, and the like. The anode sintered foil is one of key elements of the electrolytic capacitor, and the quality of the anode sintered foil is related to the service life of the electrolytic capacitor, thereby influencing the service life of the whole electronic equipment.
At present, most of the preparation technologies of anode sintered foils of electrolytic capacitors are corrosion surface expansion technologies. However, the processing method of the corrosion foil is complicated, and acid corrosion solutions such as sulfuric acid, hydrochloric acid and the like are required to be used, so that the foil quality is poor, and the service life of the anode sintered foil is shortened. And the waste acid and waste oil generated in the processing and corrosion processes are difficult to treat, so that the method has a large environmental protection pressure.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The purpose of the present disclosure is to provide a method for preparing an anode sintered foil of an aluminum electrolytic capacitor and an anode sintered foil of an aluminum electrolytic capacitor, so as to overcome the problem of poor quality of the anode sintered foil of the aluminum electrolytic capacitor at least to some extent.
According to a first aspect of the present disclosure, there is provided a method for preparing an anode sintered foil of an aluminum electrolytic capacitor, comprising: coating aluminum powder slurry on the surface of an aluminum foil substrate, and drying to obtain the aluminum foil substrate with the target coating on the surface; generating a pore-forming agent layer on the target coating to obtain an aluminum foil substrate with the target coating and the pore-forming agent layer on the surface; winding the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain an aluminum roll; sintering the aluminum coil to prepare an aluminum electrolytic capacitor anode sintered foil; wherein, in the sintering process, the pore-forming agent layer is decomposed into gas by heating.
Alternatively, the viscosity of the aluminum powder paste is 1000cps to 10000cps.
Alternatively, the volume ratio of the pore-forming agent layer to the aluminum powder in the aluminum powder slurry is 2% to 20%.
Optionally, the pore-forming agent of the pore-forming agent layer is one or more of starch, ammonium carbonate, ammonium bicarbonate, polyvinyl alcohol, urea, polymethyl methacrylate, methyl methacrylate, polystyrene and polyvinyl chloride.
Optionally, generating a pore-former layer on the target coating includes: and generating a pore-forming agent layer on the target coating by uniformly pouring the pore-forming agent.
Alternatively, in the case where the pore-forming agent is a solid, the particle diameter of the pore-forming agent is 1 μm to 20 μm; or in the case that the pore-forming agent is liquid, the concentration of the pore-forming agent is more than 20%.
Optionally, generating a pore-former layer on the target coating includes: generating a pore-forming agent layer on the target coating in a coating mode; wherein the viscosity of the slurry used in the coating process is 1000cps to 10000cps, and the coating thickness is 10 μm to 30 μm.
Optionally, the pore-former layer is thermally decomposed at a temperature of 300 ℃ to 600 ℃; the sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is consistent with the temperature of thermal decomposition of the pore-forming agent layer, and the sintering heat preservation time is 0.5h to 4h.
Optionally, sintering the aluminum coil comprises: the aluminum coil was sintered under an argon atmosphere.
According to a second aspect of the present disclosure, there is provided an aluminum electrolytic capacitor anode sintered foil produced by any one of the above production methods.
In an aspect of the disclosed embodiments, a gas film layer is formed between adjacent foil aluminum powder and aluminum powder by thermal decomposition of the pore-forming agent during sintering. When the aluminum powder reaches a molten state, the aluminum powder of the adjacent foil layers is not easy to adhere to the aluminum powder, and the adhesion between the aluminum powder in the same foil layer is not affected, so that the separation between the foil layers is kept while the adhesion strength and the specific surface area of the foil of the aluminum powder layer are ensured. After sintering, the foil can be easily detached and inverted, the subsequent formation process is not influenced, and the quality of the anode sintered foil of the aluminum electrolytic capacitor is improved. On the other hand, in the sintering process, the pore-forming agent is heated to decompose and exhaust, so that tiny holes can be formed on the surface of the aluminum powder layer. The micro holes are helpful to absorb deformation energy when the foil is bent, so that cracks are reduced, and therefore, the bending performance of the foil is improved to a certain extent. In yet another aspect, the pore formers of the disclosed aspects are formed after the aluminum powder slurry is dried, rather than being added to the aluminum powder slurry. Therefore, the thickness and specific surface area of the aluminum powder layer are not affected after sintering, and the original capacitance performance of the powder layer sintered foil is not affected.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 schematically shows a flowchart of a method of manufacturing an aluminum electrolytic capacitor anode sintered foil according to an embodiment of the present disclosure.
Fig. 2 shows a schematic diagram of a process for preparing an aluminum foil substrate having the target coating and the pore former layer on the surface of an embodiment of the present disclosure.
Fig. 3 shows a photograph of the surface topography of a foil prepared using the preparation method of an embodiment of the present disclosure.
Fig. 4 shows a photograph of the surface morphology of the foil prepared by the preparation method of the comparative example of the present disclosure.
Fig. 5 shows a photograph of the surface morphology of a foil prepared by the preparation method of another comparative example of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the present disclosure. One skilled in the relevant art will recognize, however, that the aspects of the disclosure may be practiced without one or more of the specific details, or with other methods, processes, steps, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. The flow diagrams depicted in the figures are exemplary only and not necessarily all steps are included. For example, some steps may be decomposed, and some steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
At present, due to the reason of the preparation process, the problem of adhesion between the coiled foil materials of the anode sintered foil of the electrolytic capacitor can occur, and the quality of the sintered foil is seriously influenced. In addition, the current preparation technology uses acid corrosive solutions such as sulfuric acid, hydrochloric acid and the like, and the consequent waste acid and waste oil are difficult to treat and are not environment-friendly.
In view of this, the present disclosure provides a new method for preparing an anode sintered foil of an aluminum electrolytic capacitor, which can at least solve the problems of poor quality and environmental protection of the anode sintered foil of the aluminum electrolytic capacitor.
Fig. 1 schematically shows a flowchart of a method of manufacturing an aluminum electrolytic capacitor anode sintered foil according to an embodiment of the present disclosure. Referring to fig. 1, the preparation method may include the steps of:
s12, coating aluminum powder slurry on the surface of the aluminum foil substrate, and drying to obtain the aluminum foil substrate with the target coating on the surface.
In the exemplary embodiments of the present disclosure, the aluminum powder slurry is a viscous slurry containing aluminum powder, which may be formed by mixing aluminum powder, an organic solvent, a binder, etc., and the preparation process of the aluminum powder slurry is not limited in the examples of the present disclosure.
The present disclosure considers the viscosity of aluminum powder slurry. If the viscosity of the aluminum powder slurry is too small, the slurry fluidity is increased, the coating thickness is uneven, the coating quality is reduced, and the pore-forming agent cannot be fixed later. If the viscosity of the aluminum powder slurry is too high, the slurry fluidity is poor and the coating thickness is also uneven.
After integrating the experience of the process personnel and the sets of experiments performed for this purpose, some embodiments of the present disclosure control the viscosity of the aluminum powder slurry to 1000cps to 10000cps.
First, aluminum powder slurry may be coated on the surface of an aluminum foil substrate. Next, the aluminum powder slurry is subjected to a drying treatment, and an aluminum foil substrate having a target coating on the surface thereof can be obtained. It is understood that the target coating is a coating that adheres to the surface of the aluminum foil substrate after the aluminum powder slurry is dried.
The embodiment of the disclosure does not limit the mode, time and the like of the drying operation.
S14, generating a pore-forming agent layer on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface.
In an exemplary embodiment of the present disclosure, the layer generated by the pore-former is referred to as a pore-former layer. Wherein the pore-forming agent does not react with at least the aluminum powder slurry and aluminum, and can be decomposed into gas by heating at a temperature of 300 ℃ to 600 ℃, for example.
In particular, the pore-forming agent of some embodiments of the present disclosure may be one or more of starch, ammonium carbonate, ammonium bicarbonate, polyvinyl alcohol, urea, polymethyl methacrylate, methyl methacrylate, polystyrene, polyvinyl chloride.
In some embodiments of the present disclosure. The addition content of the pore-forming agent is controlled to be 2 to 20% by volume with respect to the aluminum powder in the aluminum powder slurry.
The process of creating a pore-former layer on a target coating can be divided into a uniformly poured manner and a coated manner.
In some embodiments of the present disclosure, a layer of pore-forming agent may be created on the target coating in a manner that uniformly disperses the pore-forming agent. In the case where the pore-forming agent is a solid, the particle diameter of the pore-forming agent is 1 μm to 20 μm. In the case where the pore-forming agent is a liquid, the concentration of the pore-forming agent is greater than 20%.
In other embodiments of the present disclosure, a pore-former layer may be formed on the target coating by coating. Wherein the viscosity of the paste used in the coating process is consistent with the above-mentioned viscosity range of the aluminum powder paste, for example, 1000cps to 10000cps, and the coating thickness may be 10 μm to 30 μm.
Fig. 2 shows a schematic diagram of a process for preparing an aluminum foil substrate having the target coating and the pore former layer on the surface of an embodiment of the present disclosure.
Referring to fig. 2, first, an aluminum foil substrate is subjected to an aluminum powder slurry coating process to form an aluminum powder slurry layer on the surface of the aluminum foil substrate. Next, a baking treatment is performed to obtain an aluminum foil substrate having a target coating on the surface. Then, a pore-forming agent layer is generated on the target coating layer through a pore-forming agent slurry coating process or a pore-forming agent uniformly pouring mode, so that an aluminum foil substrate with the target coating layer and the pore-forming agent layer on the surface is obtained.
S16, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
According to some embodiments of the present disclosure, the aluminum foil substrate having the target coating and pore-former layer on the surface may be wound by a manual or winding mechanism to obtain an aluminum roll.
It is understood that rolling in the embodiments of the present disclosure refers to a process of winding an aluminum foil substrate having a target coating layer and a pore-former layer on the surface into a roll.
S18, sintering the aluminum coil to prepare anode sintered foil of the aluminum electrolytic capacitor; wherein, in the sintering process, the pore-forming agent layer is decomposed into gas by heating.
In some embodiments of the present disclosure, the sintering process may include a pore-former venting process, which may have a sintering temperature consistent with a temperature at which the pore-former layer thermally decomposes, for example, in the range of 300 ℃ to 600 ℃. In addition, the sintering heat preservation time can be 0.5h to 4h.
Regarding the sintering process, the aluminum coil may be placed in a heat treatment furnace, and the atmosphere is preferably an argon atmosphere through the test. However, it is understood that sintering of the aluminum coil may also be accomplished in a vacuum or other inert gas, which is not a limitation of the present disclosure.
According to the preparation method of the anode sintered foil of the aluminum electrolytic capacitor, on one hand, the pore-forming agent is heated, decomposed and exhausted in the sintering process, and a gas film layer is formed between the aluminum powder of the adjacent foil layers and the aluminum powder. When the aluminum powder reaches a molten state, the aluminum powder of the adjacent foil layers is not easy to adhere to the aluminum powder, and the adhesion between the aluminum powder in the same foil layer is not affected, so that the separation between the foil layers is kept while the adhesion strength and the specific surface area of the foil of the aluminum powder layer are ensured. After sintering, the foil can be easily detached and inverted, the subsequent formation process is not influenced, and the quality of the anode sintered foil of the aluminum electrolytic capacitor is improved. On the other hand, in the sintering process, the pore-forming agent is heated to decompose and exhaust, so that tiny holes can be formed on the surface of the aluminum powder layer. The micro holes are helpful to absorb deformation energy when the foil is bent, so that cracks are reduced, and therefore, the bending performance of the foil is improved to a certain extent. In yet another aspect, the pore formers of the disclosed aspects are formed after the aluminum powder slurry is dried, rather than being added to the aluminum powder slurry. Therefore, the thickness and specific surface area of the aluminum powder layer are not affected after sintering, and the original capacitance performance of the powder layer sintered foil is not affected.
In order to better explain the details and effects of the preparation method of the anode sintered foil of the aluminum electrolytic capacitor of the present disclosure, examples and comparative examples of the present disclosure are described below.
Example 1
In the first step, aluminum powder slurry with the viscosity of 1000cps is selected to coat the surface of the aluminum foil substrate, and the aluminum foil substrate with the target coating on the surface is obtained by drying.
And secondly, uniformly scattering the pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is starch particles with the particle diameter of 20 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 2%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 480 ℃, and the sintering heat preservation time is 3 hours.
Fig. 3 shows a photograph of the surface morphology of the foil prepared in the first example. Referring to fig. 3, the foil prepared by the embodiment of the disclosure has a flat surface, no adhesion and good quality.
Example two
In the first step, aluminum powder slurry with the viscosity of 3000cps is selected to coat the surface of an aluminum foil substrate, and the aluminum foil substrate with a target coating on the surface is obtained by drying.
And secondly, coating a pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is ammonium bicarbonate solution, the solvent can be consistent with the solvent of the aluminum powder slurry in the first step, the viscosity of the mixed pore-forming agent slurry is 1000cps, the coating thickness is 10 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 6%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 320 ℃, and the sintering heat preservation time is 0.5h.
Example III
In the first step, aluminum powder slurry with the viscosity of 5000cps is selected to coat the surface of an aluminum foil substrate, and the aluminum foil substrate with the target coating on the surface is obtained by drying.
And secondly, coating a pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is polyvinyl alcohol solution, the solvent can be consistent with the solvent of the aluminum powder slurry in the first step, the viscosity of the pore-forming agent slurry formed after mixing is 2000cps, the coating thickness is 20 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 10%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 300 ℃, and the sintering heat preservation time is 3 hours.
Example IV
In the first step, aluminum powder slurry with the viscosity of 5000cps is selected to coat the surface of an aluminum foil substrate, and the aluminum foil substrate with the target coating on the surface is obtained by drying.
And secondly, uniformly scattering the pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is polystyrene particles with the particle diameter of 12 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 10%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 380 ℃, and the sintering heat preservation time is 3 hours.
Example five
In the first step, aluminum powder slurry with the viscosity of 8000cps is selected to coat the surface of the aluminum foil substrate, and the aluminum foil substrate with the target coating on the surface is obtained by drying.
And secondly, coating a pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is polymethyl methacrylate solution, the solvent can be consistent with the solvent of the aluminum powder slurry in the first step, the viscosity of the pore-forming agent slurry formed after mixing is 6000cps, the coating thickness is 20 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 15%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 500 ℃, and the sintering heat preservation time is 3 hours.
Example six
Firstly, aluminum powder slurry with the viscosity of 10000cps is selected to coat the surface of an aluminum foil substrate, and the aluminum foil substrate with the target coating on the surface is obtained by drying.
And secondly, coating a pore-forming agent on the target coating to obtain the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface. Wherein the pore-forming agent is a mixed solution of polymethyl methacrylate and polyvinyl chloride, the solvent can be consistent with the solvent of the aluminum powder slurry in the first step, the viscosity of the pore-forming agent slurry formed after mixing is 8000cps, the coating thickness is 30 mu m, and the volume ratio of the added content of the pore-forming agent to the aluminum powder in the aluminum powder slurry is 20%.
And thirdly, rolling the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain the aluminum roll.
And fourthly, placing the aluminum coil into a heat treatment furnace and sintering the aluminum coil under the argon atmosphere. The sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is 500 ℃, and the sintering heat preservation time is 4 hours.
Comparative example one
The first comparative example is basically the same as the first example described above, except that: after the aluminum foil substrate with the target coating on the surface is obtained, no pore-forming agent is added.
Fig. 4 shows a photograph of the surface morphology of the foil prepared in this comparative example one. Referring to fig. 4, the case of the comparative example in which the foil material was adhered resulted in poor quality of the foil material at the adhered portion.
Comparative example two
The second comparative example is basically the same as the first example except that: after the aluminum foil substrate with the target coating on the surface is obtained, no pore-forming agent is added, and the sintering heat preservation process at 480 ℃ is removed.
Fig. 5 shows a photograph of the surface morphology of the foil prepared in this comparative example two. Referring to fig. 5, the adhesion of the foil material of the second comparative example was severe and the quality of the foil was poor.
In addition, the foils prepared in the above examples and comparative examples were also subjected to electrostatic capacity tests, and the test results are shown in table 1:
TABLE 1
As is clear from table 1, the anode foils prepared in examples one to six of the present disclosure were superior in static specific capacity and bending performance to those prepared in comparative examples one and two.
Further, the embodiment of the disclosure also discloses an aluminum electrolytic capacitor anode sintered foil, which is prepared by the preparation method of the aluminum electrolytic capacitor anode sintered foil.
It should be noted that although the steps of the methods in the present disclosure are depicted in the accompanying drawings in a particular order, this does not require or imply that the steps must be performed in that particular order, or that all illustrated steps be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
Furthermore, the above-described figures are only schematic illustrations of processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A method for preparing an anode sintered foil of an aluminum electrolytic capacitor, which is characterized by comprising the following steps:
coating aluminum powder slurry on the surface of an aluminum foil substrate, and drying to obtain the aluminum foil substrate with the target coating on the surface;
generating a pore-forming agent layer on the target coating to obtain an aluminum foil substrate with the target coating and the pore-forming agent layer on the surface;
winding the aluminum foil substrate with the target coating and the pore-forming agent layer on the surface to obtain an aluminum roll;
sintering the aluminum coil to prepare an aluminum electrolytic capacitor anode sintered foil;
wherein, in the sintering process, the pore-forming agent layer is decomposed into gas by heating.
2. The method of manufacturing according to claim 1, wherein the viscosity of the aluminum powder slurry is 1000cps to 10000cps.
3. The production method according to claim 1, wherein a volume ratio of the pore-forming agent layer to the aluminum powder in the aluminum powder slurry is 2% to 20%.
4. A method of preparing a porous material according to claim 1 or 3, wherein the pore-forming agent of the pore-forming agent layer is one or more of starch, ammonium carbonate, ammonium bicarbonate, polyvinyl alcohol, urea, polymethyl methacrylate, methyl methacrylate, polystyrene, polyvinyl chloride.
5. The method of preparing according to claim 1, wherein creating a pore-former layer on the target coating comprises:
and generating a pore-forming agent layer on the target coating by uniformly pouring the pore-forming agent.
6. The method according to claim 5, wherein in the case where the pore-forming agent is solid, the particle diameter of the pore-forming agent is 1 μm to 20 μm; or alternatively
In the case where the pore-forming agent is a liquid, the concentration of the pore-forming agent is greater than 20%.
7. The method of preparing according to claim 1, wherein creating a pore-former layer on the target coating comprises:
generating a pore-forming agent layer on the target coating in a coating mode;
wherein the viscosity of the slurry used in the coating process is 1000cps to 10000cps, and the coating thickness is 10 μm to 30 μm.
8. The method of claim 1, wherein the pore-former layer is thermally decomposed at a temperature of 300 ℃ to 600 ℃;
the sintering process comprises a pore-forming agent exhaust process, wherein the sintering temperature of the pore-forming agent exhaust process is consistent with the thermal decomposition temperature of the pore-forming agent layer, and the sintering heat preservation time is 0.5h to 4h.
9. The method of manufacturing according to claim 1, wherein sintering the aluminum coil comprises:
the aluminum coil was sintered under an argon atmosphere.
10. An aluminum electrolytic capacitor anode sintered foil prepared by the preparation method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311849951.1A CN117711828A (en) | 2023-12-29 | 2023-12-29 | Aluminum electrolytic capacitor anode sintered foil and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311849951.1A CN117711828A (en) | 2023-12-29 | 2023-12-29 | Aluminum electrolytic capacitor anode sintered foil and preparation method thereof |
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