阅读说明：本技术 一种有机粉末混铸式铝电正极制作方法 (Method for manufacturing organic powder mixed casting type aluminum electrode positive electrode ) 是由 尹志华 李良 尹超 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种有机粉末混铸式铝电正极制作方法,包括如下步骤：S10、将有机粉末与铝粉进行掺杂混合,得到复合粉体；S20、对所述复合粉体进行压铸成型,得到由丸粒构成的电芯铸体；S30、对压铸成型的电芯铸体进行真空高温碳化,然后氧化,在电芯铸体的表面形成氧化膜层,得到铝电正极。本发明有机粉末混铸式铝电正极制作方法制作的铝电正极可大大提升铝电解电容器的性能。(The invention discloses a method for manufacturing an organic powder mixed casting type aluminum electrode anode, which comprises the following steps: s10, mixing the organic powder with aluminum powder to obtain composite powder; s20, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills; and S30, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film layer on the surface of the battery core casting body to obtain the aluminum electric anode. The aluminum electric anode manufactured by the organic powder mixed casting type aluminum electric anode manufacturing method can greatly improve the performance of the aluminum electrolytic capacitor.)

1. The method for manufacturing the organic powder mixed casting type aluminum electrode anode is characterized by comprising the following steps of:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

s20, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

and S30, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film layer on the surface of the battery core casting body to obtain the aluminum electric anode.

2. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 1, wherein: in step S10, the aluminum powder and the organic powder are uniformly mixed by a wet doping process or a dry doping process to obtain a composite powder; wherein the particle sizes of the aluminum powder and the organic powder are 3nm-0.5 mm.

3. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 2, wherein: in step S20, the current collector is placed in a pre-manufactured battery cell mold, the composite powder is filled in the battery cell mold, and the composite powder is die-cast under high pressure to obtain a battery cell cast body formed by pellets of the composite powder.

4. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 3, wherein: in step S30, the battery cell cast body row plate is placed in a graphite mold cavity, and is placed in a carbonization process furnace for high-temperature baking.

5. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 4, wherein: the baking temperature of the high-temperature baking is 180-350 ℃, and the baking time is 1-10 hours.

6. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 4, wherein: and (3) putting the battery core casting body subjected to high-temperature vacuum carbonization into a high-temperature high-pressure CVD furnace, and carrying out a graphene generation process.

7. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 6, wherein: and growing a conductive graphene tube in the carbon whiskers of the vacuum carbonized carbon crystal in a high-temperature high-pressure CVD furnace at the temperature of 600-680 ℃ to form a high-conductivity cathode.

8. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 7, wherein: step S20 further includes monitoring the die-casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that the organic powder in the composite powder is free from carbonization.

9. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 8, wherein: also comprises the following steps:

and S40, carrying out formation on the aluminum electric anode obtained in the step S30 to obtain an electric core body.

10. The method for manufacturing an organic powder hybrid-cast aluminum positive electrode according to claim 9, wherein: also comprises the following steps:

and S50, packaging the cell body to obtain the aluminum electrolytic capacitor.

Technical Field

The invention belongs to the technical field of aluminum electrolytic capacitors, and particularly relates to a manufacturing method of an organic powder mixed casting type aluminum electrode.

Background

The capacitor has a function of storing electric energy and instantly discharging the electric energy, and is an indispensable electronic component in the fields of electronics and power. The capacitor is widely applied to circuits such as power supply filtering, signal coupling, resonance, direct current isolation and the like, makes contribution to non-wear out for rapid development of modern electronic technology, is also widely applied to electronic equipment such as household appliances and computers, and is an irreplaceable electronic component in the electrical and electronic industries.

Among the capacitors, the aluminum electrolytic capacitor is the most commonly used device, and generally includes an anode foil, a cathode foil and an electrolytic paper, which are wound together to form a capacitor core package. At present, most of anode foils are corrosion foils, and although the corrosion foils can increase the surface area of the anode foils, the increased area is limited, so that the final performance improvement of the aluminum electrolytic capacitor is limited.

With the maturity of powder metallurgy technology, the powder metallurgy technology is used in a plurality of metal part rough blank preparation processes, generally is simple substance metal or alloy metal, and the processing technology is mature, after the powder is extruded and formed, the powder is calcined in a high-temperature vacuum to a crystallization state or a crystal boundary tends to a stable state, and then the temperature is reduced for finish machining, so that the process is efficient, high in quality and high in added value. Therefore, if the processing technology can be combined into the electrode production of the aluminum electrolytic capacitor, the performance of the aluminum electrolytic capacitor can be greatly improved.

The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.

Disclosure of Invention

The invention aims to provide a method for manufacturing an organic powder mixed casting type aluminum positive electrode, so as to solve at least one of the problems in the background art.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

a method for manufacturing an organic powder mixed casting type aluminum electrode anode comprises the following steps:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

s20, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

and S30, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film layer on the surface of the battery core casting body to obtain the aluminum electric anode.

Further, in step S10, the aluminum powder and the organic powder are uniformly mixed by a wet doping process or a dry doping process to obtain a composite powder; wherein the particle sizes of the aluminum powder and the organic powder are 3nm-0.5 mm.

Further, in step S20, the current collector is placed in a pre-manufactured battery cell mold, the composite powder is filled in the battery cell mold, and the composite powder is die-cast under high pressure, so as to obtain a battery cell cast body formed by composite powder pellets.

Further, in step S30, the battery cell cast body row tray is placed in a groove of a graphite mold, and is placed in a carbonization process furnace for high-temperature baking.

Further, the baking temperature of the high-temperature baking is 180-350 ℃, and the baking time is 1-10 hours.

And further, putting the battery core casting body subjected to high-temperature vacuum carbonization into a high-temperature high-pressure CVD furnace, and carrying out a graphene generation process.

Further, the electric core casting body grows a conductive graphene tube in the carbon whisker of the carbon crystal after vacuum carbonization in a high-temperature high-pressure CVD furnace at the temperature of 600-680 ℃ to form a high-conductivity cathode.

Further, step S20 includes monitoring the die-casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that no carbonization occurs in the organic powder in the composite powder.

Further, the method also comprises the following steps:

and S40, carrying out formation on the aluminum electric anode obtained in the step S30 to obtain an electric core body.

Further, the method also comprises the following steps:

and S50, packaging the cell body to obtain the aluminum electrolytic capacitor.

The technical scheme of the invention has the beneficial effects that:

compared with the prior art, the aluminum electric anode manufactured by the organic powder mixed casting type aluminum electric anode manufacturing method can greatly improve the performance of the aluminum electrolytic capacitor.

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 invention, as claimed.

For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart illustrating a method for fabricating an organic powder co-cast aluminum positive electrode according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of composite powder for an organic powder co-cast aluminum positive electrode manufacturing method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a cell casting body of an organic powder hybrid-casting type aluminum positive electrode manufacturing method according to an embodiment of the invention;

fig. 4 is a schematic diagram of an aluminum electrolytic capacitor made of an aluminum positive electrode according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer and more obvious, so that those skilled in the art can better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, "plurality" means two or more, and the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 4, a method for manufacturing an organic powder mixed casting type aluminum positive electrode according to an embodiment of the present invention includes the following steps:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

wherein the particle sizes of the aluminum powder and the organic powder are 3nm-0.5 mm; in one embodiment, the aluminum powder and the organic powder are uniformly mixed by a wet doping process to obtain a composite powder; specifically, aluminum powder and organic powder are mixed by a solvent, then the solvent is rapidly separated out and dried to obtain a mixture of the aluminum powder and the organic powder, and the mixture is ground into powder to obtain the composite powder 100.

In one embodiment, the aluminum powder and the organic powder are uniformly mixed by a dry doping process; specifically, the aluminum powder and the organic powder are directly stirred and mixed in a vibration mode through a mixer, the organic powder is adsorbed onto aluminum metal particles to obtain composite powder 100, and the composite powder is collected and packaged through a composite powder collector. The pollution degree in the dry doping process is small, and the dispersion is sufficient. In some embodiments, the organic powder is a starch (halogen-free, gluten-free) powder.

S20, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

specifically, the current collector is placed in a prefabricated battery core die, the composite powder is filled in the battery core die to wrap the aluminum tongue of the metal guide pin, and then the composite powder is die-cast under high pressure, so that the battery core casting body 200 formed by the pills of the composite powder is obtained. Wherein, the current collector comprises a conductive metal guide pin 201, a guide foil and the like.

When the composite powder is subjected to high-pressure die casting, the pressure is converted into heat, organic matter powder in the composite powder is carbonized, and aluminum powder is recrystallized and precipitated, so that the composite powder is changed in quality, the pressure precision needs to be strictly controlled in the process of die casting the composite powder under high pressure, and the pressure precision requirement is high; in some examples, the step S20 further includes monitoring the die casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that no carbonization occurs in the organic powder in the composite powder.

S30, carrying out vacuum high-temperature carbonization on the die-cast battery cell cast body, then oxidizing, and forming an oxide film layer on the surface of the battery cell cast body to obtain an aluminum electrode anode;

in some embodiments, the die-cast battery core casting is subjected to vacuum high-temperature carbonization, specifically, the battery core casting is placed into a graphite mold groove cavity, and is placed into a carbonization process furnace for high-temperature baking, wherein the baking temperature is 180 ℃ to 350 ℃, and the baking time is 1 to 10 hours; and (3) carrying out high-temperature vacuum carbonization on the organic powder, enabling carbon whiskers of the carbon crystals to grow and penetrate into aluminum grain boundaries, and completing solid crystal filling (filling gaps among the aluminum grain boundaries).

In some embodiments, the die-cast battery core casting is subjected to high-temperature vacuum carbonization and graphene generation, specifically, the battery core casting is placed in a graphite mold groove cavity, and is placed in a carbonization process furnace to be subjected to high-temperature vacuum baking carbonization, wherein the baking temperature is 180 ℃ to 350 ℃, and the baking time is 1 hour to 10 hours. And transferring the carbon whisker to a high-temperature high-pressure CVD (chemical vapor deposition) vacuum furnace, performing a graphene generation process, specifically, further growing a conductive graphene tube in the carbon whisker of the carbon crystal subjected to vacuum carbonization at the temperature of 600-680 ℃ to form a high-conductivity cathode, and completing solid crystal (aluminum crystal boundary gap) filling. The electric conductor composed of the carbon whiskers, the carbon crystals and the graphene tube directly serves as a main body for the attachment and adsorption of the cathode low-conductivity electrolyte, plays a role in surface electrification of the anode in subsequent cathode extraction, and is connected with the metal conductor to form a good cathode.

In some embodiments, the method further comprises the steps of:

s40, carrying out formation on the aluminum electric anode obtained in the step S30 to obtain an electric core body;

specifically, the soot formed from the carbonized organic powder is dissolved and precipitated, and then electrochemically energized. Specifically, the aluminum electrode positive electrode obtained in step S30 is subjected to ethanol immersion ultrasonic cleaning, ash formed by the organic powder being cremated during high-temperature carbonization is melted and precipitated, and then electrochemical energization is performed. In some embodiments, the electrochemical energizing process is to electrically oxidize the aluminum anode in an acid solution of adipic acid, boric acid, or a mixture thereof to grow an α -phase aluminum oxide dielectric film, wherein the film thickness of the dielectric film determines the withstand voltage and the specific volume. The size of the enabling current is 5% -30% of the current-carrying limit capacity of the aluminum electrode positive electrode, the enabling voltage is not provided with an upper limit, and the voltage is applied from 3VDC to 2000VDC in practical application. It should be noted that, during the energizing process, the volume of the aluminum electric anode may expand, which is a process of maximizing the specific volume of the aluminum electric anode due to the growth of the oxide film to enlarge the aluminum electric anode.

In some embodiments, the method further comprises the steps of:

s50, packaging the cell body to obtain the aluminum electrolytic capacitor;

specifically, a high-molecular conductive polymer is wrapped on the surface of the cell body, a metal aluminum shell is filled, a conductive high-molecular material is filled in the metal shell, and the high-molecular conductive polymer is combined with the aluminum shell into a whole after polymerization reaction to form a cathode and a lead-out metal electrode of the capacitor; finally, the anode end face is packaged through epoxy resin or rubber particles, and the anode terminal transition section is wrapped in the sealing rubber head; various pin terminals are extended from the positive and negative electrodes by resistance welding to obtain the aluminum electrolytic capacitor 300.

It is to be understood that the foregoing is a more detailed description of the invention as it relates to specific/preferred embodiments and that no limitation to the specific embodiments is intended as being implied by the limitation presented herein. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the present patent. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.

In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the invention as defined by the appended claims.

Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. One of ordinary skill in the art will readily appreciate that the above-disclosed, presently existing or later to be developed, processes, machines, manufacture, compositions of matter, means, methods, or steps, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.