Method for processing an electrosorptive conductive electrode sheet

Abstract

The application discloses a processing method of an electrosorption conductive electrode sheet, and comprises the following steps: (1) uniformly mixing polyvinylidene fluoride, activated carbon powder or carbon nanotubes or graphene and carbon black conductive agent according to a mass ratio of 25-45:35-65:5-25 to obtain a mixture; (2) adding a solvent to the obtained mixture to obtain a slurry, wherein the mass ratio of the solvent to the mixture is 1:4-6; (3) putting the obtained slurry into a stirrer to mix uniformly, and then performing vacuum defoaming; (4) performing blade coating on a polytetrafluoroethylene base film with a smooth surface to form a composite film sheet, immersing the composite film sheet into pure water after the blade coating, and taking out after standing; (5) separating the surface active coating film from the polytetrafluoroethylene base film for the taken-out composite film sheet, and immersing the surface active coating film into pure water again for cleaning after the separation; (6) placing the surface active coating film into an oven for drying after the cleaning; and (7) completing the processing of the electrode sheet by compounding and hot-pressing two dry surface active coating films with a conductive metal wire mesh after the drying.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electrosorption in water treatment and purification technology, and more particularly relates to a processing method of an electrosorption conductive electrode sheet. BACKGROUND

[0002] Electrosorption is a common water treatment and purification technology. The electrosorption method applies the double electric layer theory in electrochemistry to realize the adsorption of ions in water by using the large specific surface area of the material, so as to purify the water quality. The main acting element of the electrosorption is the adsorption electrode. The processing of the adsorption electrode is commonly carried out by using an oily solvent. The processing process needs a long drying channel, and a large amount of organic steam is generated, which has a high requirement on the processing environment and equipment. SUMMARY

[0003] The purpose of the present application is to solve the problem that the processing of the adsorption electrode needs a long drying channel, and a large amount of organic steam is generated, which has a high requirement on the processing environment and equipment.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a processing method of an electrosorption conductive electrode sheet, comprising the following steps:

[0005] (1) uniformly mixing polyvinylidene fluoride and active substances active carbon powder or carbon nanotubes or graphene and conductive agent carbon black according to the mass ratio of 25-45%: 35-65%: 5-25% to obtain a mixture;

[0006] (2) adding an organic solvent to the mixture obtained in step (1) to obtain a slurry, and the mass ratio of the organic solvent to the mixture is 1:4-6;

[0007] (3) putting the slurry obtained in step (2) into a stirrer for mixing for 4-8h, and then performing vacuum defoaming after mixing;

[0008] (4) scraping the slurry after defoaming in step (3) on a polytetrafluoroethylene base film with a smooth surface to form a composite film sheet, and then immersing the composite film sheet in pure water, and taking out after standing for 10-30min;

[0009] (5) separating the surface active coating film from the polytetrafluoroethylene base film for the composite film sheet taken out in step (4), and then immersing the surface active coating film in pure water again for cleaning 2-3 times;

[0010] (6) placing the surface active coating film in an oven for drying at 80℃ for 12-24h after cleaning;

[0011] (7) after drying, taking two pieces of dry surface active coating films and performing 120-160℃ composite hot pressing with the conductive metal wire mesh;

[0012] (8) After hot pressing, cooling is completed to process the pole piece.

[0013] Preferably, the solvent in step (2) is N,N-dimethylformamide, N,N-dimethylacetamide or N-methyl-2-pyrrolidone.

[0014] Preferably, the separation of the surface-active coating film and the polytetrafluoroethylene-based film in step (5) is performed by dropping pure water at the junction of the surface-active coating film and the polytetrafluoroethylene-based film.

[0015] Preferably, the conductive metal wire mesh in step (7) is a titanium wire mesh, a platinum wire mesh or a stainless steel wire mesh.

[0016] Preferably, the surface-active coating film and the conductive metal wire mesh are bent or laid flat in the desired shape during the hot pressing process in step (7).

[0017] The present application has the following beneficial effects: the present application uses an interfacial polymerization method to precipitate an organic solvent, reduces the length of the drying channel required for the organic solvent volatilization hazard, and can safely process an oily pole piece in a smaller space. At the same time, the scheme reduces the amount of base metal material used, and can reduce the processing cost of the pole piece. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0020] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless explicitly and specifically limited otherwise.

[0021] In the present application, unless explicitly and specifically defined otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For the first person skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0022] In the present application, unless explicitly and specifically defined otherwise, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] Embodiments

[0024] The following is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the following examples. Any technical solution that falls within the scope of the present application is within the protection scope of the present application.

[0025] The present application discloses a processing method of an electric adsorption conductive electrode sheet, comprising the following steps:

[0026] (1) uniformly mix polyvinylidene fluoride, active substance activated carbon powder or carbon nanotube or graphene, and conductive agent carbon black according to the mass ratio of 25-45%: 35-65%: 5-25% to obtain a mixture;

[0027] (2) adding an organic solvent to the mixture obtained in step (1) to obtain a slurry, the mass ratio of the organic solvent to the mixture is 1:4-6;

[0028] (3) putting the slurry obtained in step (2) into a stirrer for 4-8h, and defoaming under vacuum after mixing;

[0029] (4) the defoamed slurry of step (3) is scraped on a polytetrafluoroethylene base film to form a composite film, and the composite film is immersed in pure water after scraping, and is taken out after standing for 10-30 min;

[0030] (5) the surface active coating film is separated from the polytetrafluoroethylene base film in the composite film taken out in step (4), and the surface active coating film is immersed in pure water again for 2-3 times of cleaning;

[0031] (6) the surface active coating film is dried in an oven at 80℃ for 12-24 h after cleaning;

[0032] (7) two dry surface active coating films are taken out after drying, and are compounded with a conductive metal wire mesh at 120-160℃ for hot pressing;

[0033] (8) the processing of the pole piece is completed after cooling after hot pressing.

[0034] In step (2), the solvent is N,N-dimethylformamide, N,N-dimethylacetamide or N-methyl-2-pyrrolidone. In step (5), the separation of the surface active coating film from the polytetrafluoroethylene base film is performed by dropping pure water at the junction of the two. In step (7), the conductive metal wire mesh is a titanium wire mesh, a platinum wire mesh or a stainless steel wire mesh. In step (7), the surface active coating film and the conductive metal wire mesh are bent or laid flat according to the required shape during the hot pressing process.

[0035] The present application uses an interfacial polymerization method to precipitate an organic solvent, reduces the length of the drying channel required for the organic solvent volatilization hazard, and can safely process the oily pole piece in a smaller space. At the same time, the scheme reduces the amount of base metal material, which can reduce the processing cost of the pole piece. The active ingredients of the pole piece obtained at the same time have independent support.

[0036] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A method of processing an electrosorptive conductive electrode sheet, characterized by, It comprises the following steps: (1) uniformly mix polyvinylidene fluoride, activated carbon powder or carbon nanotubes or graphene as active substances, and carbon black as conductive agent according to the mass ratio of 25-45%:35-65%:5-25% to obtain a mixture; (2) add an organic solvent to the mixture obtained in step (1) to obtain a slurry, the mass ratio of the organic solvent to the mixture is 1:4-6, and the solvent is N,N-dimethylformamide, N,N-dimethylacetamide or N-methyl-2-pyrrolidone; (3) put the slurry obtained in step (2) into a blender for uniform mixing for 4-8h, and then perform vacuum defoaming after mixing; (4) scrape the slurry after defoaming in step (3) on a smooth polytetrafluoroethylene base film to form a composite film, then immerse the composite film in pure water after scraping, and take it out after standing for 10-30min; (5) separate the surface active coating film from the polytetrafluoroethylene base film in step (4), and then immerse the surface active coating film in pure water again for 2-3 times of cleaning; (6) after cleaning, place the surface active coating film in an oven at 80℃ for 12-24h; (7) after drying, take two pieces of dry surface active coating film and conductive metal wire mesh for 120-160℃ composite hot pressing; (8) after hot pressing, cool to complete the processing of the pole piece.

2. The method of claim 1, wherein the method further comprises: In step (5), pure water is added at the junction of the surface active coating film and the polytetrafluoroethylene base film to separate the two.

3. The method of claim 1, wherein the method further comprises: In step (7), the conductive metal wire mesh is a titanium wire mesh or a platinum wire mesh.

4. The method of claim 1, wherein the method further comprises: In step (7), the surface active coating film and the conductive metal wire mesh are bent or placed according to the required shape during the hot pressing process.