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KR-102963585-B1 - MANUFACTURING METHOD AND SYSTEM OF ALUMINUM-POLYMER COMPOSITE SHEET USING MOLECULAR BONDING, AND ALUMINUM-POLYMER COMPOSITE SHEET MANUFACTURING THEREOF

KR102963585B1KR 102963585 B1KR102963585 B1KR 102963585B1KR-102963585-B1

Abstract

A method and manufacturing system for manufacturing an aluminum-polymer composite sheet for a secondary battery pouch by a molecular bonding method are disclosed. The method for manufacturing an aluminum-polymer resin composite sheet by a molecular bonding method according to the present invention comprises: a degreasing step (S1) for degreasing an aluminum foil; a surface impurity removal step (S2) for removing surface impurities from the aluminum foil degreased through the step (S1); an activation treatment step (S3) for activating the surface of the aluminum foil from which impurities have been removed through the step (S2); and a bonding step (S4) for bonding a polymer resin to the aluminum foil whose surface has been activated through the step (S3) to manufacture an aluminum-polymer composite sheet by a molecular bonding method.

Inventors

  • 김정한
  • 한병준
  • 박진웅

Assignees

  • 국립한밭대학교 산학협력단

Dates

Publication Date
20260513
Application Date
20250812
Priority Date
20241107

Claims (13)

  1. As a method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, Degreasing step (S1) for degreasing aluminum foil; A surface impurity removal step (S2) for removing surface impurities from the aluminum foil degreased through the above step (S1); An activation treatment step (S3) for activating the surface of the aluminum foil from which impurities have been removed through the above step (S2); And, the method includes a bonding step (S4) for manufacturing an aluminum-polymer composite sheet by bonding a polymer resin to the aluminum foil whose surface has been activated through the above step (S3), and The above activation treatment step (S3) comprises a triazine activation treatment step (S31) in which the aluminum foil from which surface impurities have been removed through the above step (S2) is activated in a triazine electrolyte; After the above step (S31), a step of washing with distilled water (S32); A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized by including a drying step (S33) after the above step (S32).
  2. In Article 1, The above degreasing step (S1) is a step (S11) of washing the prepared aluminum foil in distilled water; After the above step (S11), a step (S12) of ultrasonically cleaning the cleaned aluminum in ethanol; After the above step (S12), a step (S13) of ultrasonically cleaning the cleaned aluminum in an alkaline solution; After the above step (S13), a step (S14) of washing the washed aluminum in distilled water; A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized by including, after the above step (S14), a step (S15) of ultrasonically cleaning the cleaned aluminum in ethanol.
  3. In Article 1, The above surface impurity removal step (S2) comprises: a step (S21) of ultrasonically cleaning the aluminum foil degreased through the above step (S1) in an acetone solution; After the above step (S21), a step (S22) of acid treatment on the washed aluminum foil; A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized by including, after the above step (S22), a step (S23) of ultrasonically cleaning the acid-treated aluminum foil in an ethanol solution.
  4. In Paragraph 3, A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized in that the acid treatment in the above step (S22) is performed at a temperature of 45 to 55°C for 3 to 7 minutes in a mixture of nitric acid and hydrofluoric acid mixed in a 30:1 ratio.
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  6. In Article 1, The triazine electrolyte used in the above triazine activation treatment step (S31) is, One or more triazines; One or more additives; A molecular bonding method for manufacturing an aluminum-polymer resin composite sheet, characterized by including sulfur ions or sulfate ions.
  7. In Paragraph 6, A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized in that one or more triazines included in the above triazine electrolyte comprise at least one selected from 6-mercapto-1,3,5-triazine-dithiol, 6-mercapto-1,3,5-triazine-dithiol monosodium, and 6-dibutylamino-1,3,5-triazine-dithiol.
  8. In Paragraph 6, A method for manufacturing an aluminum-polymer resin composite sheet by molecular bonding, characterized in that one or more additives included in the above triazine electrolyte comprise dimethylformamide and 2-hydroxyethyl disulfide.
  9. As a manufacturing system for the aluminum-polymer resin composite sheet of claim 1, Unwinder providing aluminum foil; A rewinder for recovering manufactured aluminum-polymer resin composite sheets; Degreasing unit for performing a degreasing step (S1); An impurity removal unit for performing a surface impurity removal step (S2); Activation processing unit for performing the activation processing step (S3); A joint for performing a joining step (S4); and Includes a polymer resin unwinder of at least one size, The above joint includes one or more laminating rollers, and The activation treatment step (S3) performed in the above activation treatment unit comprises a triazine activation treatment step (S31) in which surface impurities have been removed from the aluminum foil and activated in a triazine electrolyte; After the above step (S31), a step of washing with distilled water (S32); A manufacturing system for an aluminum-polymer resin composite sheet, characterized by including a drying step (S33) after the above step (S32).
  10. delete
  11. In Article 9, The triazine electrolyte used in the above triazine activation treatment step (S31) is, One or more triazines; One or more additives; A manufacturing system for an aluminum-polymer resin composite sheet characterized by including sulfur ions or sulfate ions.
  12. In Article 9, A manufacturing system for an aluminum-polymer resin composite sheet, wherein the above-mentioned laminating rollers heat and pressurize the incoming aluminum sheet and polymer resin film at a temperature of 180 to 230°C and a pressure of 8 to 20 MPa.
  13. Aluminum-polymer resin composite sheet manufactured according to either Article 1 or Article 9.

Description

Manufacturing method and system of aluminum-polymer composite sheet using molecular bonding, and aluminum-polymer composite sheet manufactured thereby The present invention relates to a method and system for manufacturing an aluminum-polymer composite sheet, and more specifically, to a method and system for manufacturing an aluminum and polymer composite sheet for a secondary battery pouch by a molecular bonding method. Generally, the term "secondary battery" refers to a lithium-ion battery. Traditionally, it has been primarily used in electronic products such as laptops, smartphones, tablet PCs, and video cameras, but demand has increased explosively due to the rise of electric vehicles. As the above secondary batteries pursue miniaturization, lightweighting, and thinning due to explosive demand, they must also overcome various environmental factors such as harsh thermal environments and mechanical shock in order to be used in electric vehicles. Due to the demand mentioned above, the global secondary battery market size reached approximately $82 billion in 2023 and is estimated to reach approximately $387.005 billion by 2032. To meet the demand of a secondary battery market of the scale mentioned above, a problem arises in that secondary batteries must possess high energy density and battery pack safety. Meanwhile, battery shapes can be classified into cylindrical, prismatic, and pouch types. The cylindrical battery has the advantages of low cost and high stability but has the disadvantages of being heavy and having short durability. The prismatic secondary battery has the advantages of long lifespan and high productivity but has the disadvantages of being heavy and having poor stability. The pouch type has the advantages of being lightweight and having high energy density but has the disadvantages of having poor durability and low productivity. Among the batteries mentioned above, pouch-type batteries are used in high-demand electronic products, including electric vehicles, as lightweight design and high energy density are advantageous; as such, the demand for them can be described as explosive. As described above, the pouch-type secondary battery is wrapped in a pouch for secondary batteries; therefore, the pouch here refers to the outer material of the battery, and the pouch is typically manufactured using aluminum foil. For the reasons mentioned above, aluminum pouch cells are undergoing significant development in various sizes and shapes. The above pouch cell film has a multilayer structure consisting of a protective layer made of nylon, an adhesive layer, an aluminum layer, and an internal silane layer, which is a cast polypropylene (CPP) layer. That is, a conventional ordinary laminated pouch film is formed with a multilayer structure as shown in FIG. 1, and the pouch film (10) is composed of a nylon protective layer (11) of about 25 μm, an adhesive layer (12) of about 110 μm, a coating layer (13) of about 1 μm, an aluminum layer (14) of about 40 μm, a coating layer (13') of about 1 μm, an adhesive layer (12'), and a CPP layer (15) of about 4 μm. As a result, the thickness of the film (10) becomes thick, and deterioration of the adhesive in the adhesive layer (12, 12') and the CPP layer (15), which is a silane layer, may occur, and consequently, the bonding strength and airtightness may be weakened. The problem with conventional laminate pouch films as described above is that when the adhesive layer is exposed to particularly large amounts of moisture, water molecules penetrate the interface of silocane bonds and interact with the silocane bonds. That is, as shown in [Chemical Formula 1] below, When siloxane bonds come into contact with water molecules, they form two silanol groups through a hydrogenation reaction, which leads to the degradation behavior of the adhesive. Figure 2 is a graph of lap shear strength according to aging time, showing that adhesive strength is very sensitive to moisture and heat reduction. In addition, when water molecules come into contact with the adhesive layer (12, 12') created by the use of an adhesive, a reaction such as the following [Chemical Formula 2] also occurs. Referring to Figure 3, which is a graph of absorbance against wave number resulting from the FT-IR analysis of [Chemical Formula 2] above, it can be seen that the peak of the carboxyl group increases and the peak of the amide group decreases with aging. It is understood that the aforementioned heat curing problems of conventional aluminum pouches are caused by the use of adhesives. Meanwhile, the prior art regarding the triazine and pouch film for secondary batteries intended for use in the present invention is as follows. For example, Registered Patent No. 10-1454417 (registered on October 17, 2014) discloses an aluminum pouch film for a secondary battery, a packaging material including the same, a secondary battery including the same, and a method for manufacturing the same. However, the invention in