Aluminum-plastic film and its preparation method, batteries and electrical equipment

Abstract

This application provides an aluminum-plastic film, a method for preparing the same, a battery, and an electrical device. The aluminum-plastic film includes an aluminum foil and a corrosion-resistant coating disposed on at least one surface of the aluminum foil; the corrosion-resistant coating includes element A, selected from at least one of Ti and Zr elements, and element Si. This aluminum-plastic film achieves superior resistance to electrolyte corrosion, thereby reducing the risk of battery electrolyte leakage, improving battery safety performance, and extending its service life.

Description

Technical Field

[0001] This application relates to the field of materials technology, specifically to aluminum-plastic films and their preparation methods, batteries, and electrical equipment. Background Technology

[0002] Currently, aluminum-plastic film is commonly used as the encapsulation material for secondary batteries. While aluminum-plastic film possesses superior mechanical, thermal insulation, and moisture-proof properties, its electrolyte resistance still needs improvement. Current aluminum-plastic films corrode under prolonged immersion in electrolyte, leading to electrolyte leakage and threatening battery life and safety. Summary of the Invention

[0003] Therefore, embodiments of this application provide an aluminum-plastic film and its preparation method, a battery, and an electrical device. This aluminum-plastic film achieves superior resistance to electrolyte corrosion, thereby reducing the risk of battery electrolyte leakage, and ultimately improving battery safety and extending its service life.

[0004] The first aspect of this application provides an aluminum-plastic film, including an aluminum foil and a corrosion-resistant coating disposed on at least one side surface of the aluminum foil; the corrosion-resistant coating includes element A, wherein element A is selected from at least one of element Ti and element Zr and element Si.

[0005] The aforementioned Ti, Zr, and Si elements can all impart a certain degree of resistance to electrolyte corrosion to the corrosion-resistant coating, which is beneficial for improving battery safety and extending battery life. Furthermore, Si can enhance the hydrophobic properties of the corrosion-resistant coating, reduce the contact angle between the electrolyte and the coating, and inhibit electrolyte wetting of the coating, thereby further reducing electrolyte corrosion.

[0006] The second aspect of this application provides a method for preparing an aluminum-plastic film, comprising:

[0007] A mixture is obtained by mixing a Ti element source and / or a Zr element source, a silane coupling agent, and water; the mixture is formed on at least one side surface of the aluminum foil and cured to form a corrosion-resistant coating to obtain an aluminum-plastic film;

[0008] The corrosion-resistant coating includes element A, which is selected from at least one of element Ti and element Zr, as well as element Si.

[0009] The above preparation method is simple, efficient, and suitable for large-scale industrial production.

[0010] A third aspect of this application provides a battery including an aluminum-plastic film; the aluminum-plastic film is the aluminum-plastic film provided in the first aspect of this application, or the aluminum-plastic film is obtained by the preparation method of the aluminum-plastic film provided in the second aspect of this application.

[0011] The fourth aspect of this application provides an electrical device, including the battery provided in the third aspect of this application. Attached Figure Description

[0012] Figure 1A This is a simplified structural diagram of an aluminum-plastic film provided in one embodiment of this application;

[0013] Figure 1B A simplified schematic diagram of the structure of an aluminum-plastic film provided in another embodiment of this application;

[0014] Figure 2 A simplified schematic diagram of the structure of an aluminum-plastic film provided in another embodiment of this application;

[0015] Figure 3 This is a schematic diagram illustrating the possible bonding methods between the corrosion-resistant coating and the aluminum foil interface.

[0016] Explanation of reference numerals in the attached drawings: 1-Aluminum-plastic film; 10-Aluminum foil; 20-Corrosion-resistant coating; 201-First corrosion-resistant coating; 202-Second corrosion-resistant coating; 203-Third corrosion-resistant coating; 30-Nylon layer; 40-Heat-sealing layer. Detailed Implementation

[0017] Currently, aluminum-plastic film is a commonly used encapsulation material for rechargeable batteries. In the production process, aluminum-plastic film is generally used to encapsulate stacked battery components such as the positive electrode, separator, and negative electrode to obtain a dry cell. Electrolyte is then injected into the dry cell to form a battery cell, which is then used to obtain the rechargeable battery. While existing aluminum-plastic films possess good mechanical and thermal insulation properties, their resistance to electrolyte corrosion is relatively weak. During electrolyte injection, if electrolyte drips onto the surface of the aluminum-plastic film, the dripping electrolyte will corrode the film, making the corresponding location a weak point during the battery's service life and seriously threatening its safety performance. Furthermore, the inner surface of the aluminum-plastic film, constantly immersed in electrolyte, will also corrode, potentially causing electrolyte leakage and affecting the battery's lifespan and safety performance.

[0018] To address the aforementioned technical problems, this application provides an aluminum-plastic film, which can be found in the embodiments described above. Figures 1A to 1B The aluminum-plastic film 1 includes an aluminum foil 10 and a corrosion-resistant coating 20 disposed on at least one side of the aluminum foil 10; the corrosion-resistant coating 20 includes element A, which is selected from at least one of Ti and Zr elements and Si element. In the embodiments of this application, the presence of element A can be characterized by EDS.

[0019] In this embodiment, the corrosion-resistant coating 20 may be provided on one side of the aluminum foil 10, or the corrosion-resistant coating 20 may be provided on both opposite sides of the aluminum foil 10. In some embodiments of this application, the corrosion-resistant coating 20 is provided on both opposite sides of the aluminum foil 10.

[0020] The aforementioned Ti, Zr, and Si elements can all impart a certain degree of resistance to electrolyte corrosion to the corrosion-resistant coating, which is beneficial for improving battery safety and extending battery life. Furthermore, Si can enhance the oleophobic properties of the corrosion-resistant coating, reduce the contact angle between the electrolyte and the coating, and inhibit electrolyte wetting of the coating, thereby further reducing electrolyte corrosion. In addition, Si also helps to improve the flexibility of the corrosion-resistant coating.

[0021] In some embodiments of this application, the corrosion-resistant coating further includes a resin. The resin possesses superior density and certain mechanical properties; furthermore, it is understood that the presence of resin in the corrosion-resistant coating can impart higher density, further enhancing its resistance to electrolyte corrosion. In some specific embodiments, the resin includes, but is not limited to, one or more of acrylic resin, polyurethane resin, fluorocarbon resin, and epoxy resin. The aforementioned resin materials exhibit superior chemical stability, mechanical properties, and sealing performance. Furthermore, the aforementioned resins have good flexibility, which is beneficial for improving the flexibility of the corrosion-resistant coating. In the embodiments of this application, the presence of the resin can be characterized using methods such as nuclear magnetic resonance (NMR) and infrared spectroscopy. In some specific embodiments, the aforementioned resin is a cross-linked resin with a cross-linked network structure. During the preparation of the corrosion-resistant coating, rare earth additives are added to the raw materials to improve the degree of curing and curing rate of the resin and increase the fineness of the coating. Therefore, in some embodiments of this application, the corrosion-resistant coating further includes rare earth additives or their reactants. Specifically, the rare earth additives may be, for example, one or more of cerium nitrate, cerium acetate, lanthanum nitrate, lanthanum acetate, dysprosium acetate, etc., containing rare earth salts.

[0022] In some embodiments of this application, element A and resin are uniformly dispersed in the corrosion-resistant coating. This results in good uniformity of the corrosion-resistant coating and superior overall protective performance of the aluminum-plastic film.

[0023] In some embodiments of this application, element A forms chemical bonds with the resin. This results in better stability of the corrosion-resistant coating, reducing the likelihood of deterioration and extending the service life of the aluminum-plastic film. In some specific embodiments, the aforementioned chemical bonds include, but are not limited to, one or more of COA bonds and CA bonds. Specifically, the COA bond can be, for example, one or more of CO-Si, CO-Zr, and CO-Ti bonds, and the CA bond can be, for example, one or more of C-Si, C-Zr, and C-Ti bonds. In some specific embodiments, the corrosion-resistant coating includes a compound containing AOA bonds; the compound containing AOA bonds forms chemical bonds with the resin; the AOA bonds include at least one of Si-O-Ti bonds, Si-O-Zr bonds, and Si-O-Si bonds. In other specific embodiments, when element A simultaneously includes Si, Ti, and Zr elements, the aforementioned AOA bonds also include at least one of Ti-O-Ti bonds, Ti-O-Zr bonds, and Zr-O-Zr bonds. This further enhances the corrosion resistance of the coating.

[0024] In some embodiments of this application, the resin accounts for 5 wt% to 15 wt% of the mass of the corrosion-resistant coating. This helps to ensure the mechanical properties and density of the corrosion-resistant coating without crowding out the proportion of element A, thereby benefiting the overall performance of the corrosion-resistant coating. Specifically, the mass percentage of the resin in the corrosion-resistant coating can be, for example, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, etc.

[0025] In some embodiments of this application, the corrosion-resistant coating has at least one of Si-O-Si bonds, Si-O-Ti bonds, and Si-O-Zr bonds, and hydrogen bonds are formed between the aluminum foil and the corrosion-resistant coating (see [link]). Figure 3 Understandably, in some embodiments, during the preparation of the aluminum-plastic film, the aluminum foil is pretreated to give its surface hydroxyl groups. When the corrosion-resistant coating has any one of Si-O-Si bonds, Si-O-Ti bonds, and Si-O-Zr bonds, these chemical bonds can form hydrogen bonds with the hydroxyl groups of the aluminum foil, thereby forming hydrogen bonds between the corrosion-resistant coating and the aluminum foil, improving the interfacial bonding between the corrosion-resistant coating and the aluminum foil, and further improving the structural stability of the aluminum-plastic film.

[0026] In some embodiments of this application, the corrosion-resistant coating contains silanol groups. These silanol groups react with hydroxyl groups on the surface of the aluminum foil to form Si-O bonds, thereby creating Si-O bonds between the corrosion-resistant coating and the aluminum foil. The stronger chemical bonds enhance the interfacial adhesion between the corrosion-resistant coating and the aluminum foil.

[0027] In some embodiments of this application, the mass percentage of Si in the corrosion-resistant coating is 0.28 wt% to 2.5 wt%. This optimizes the interfacial adhesion between the corrosion-resistant coating and the aluminum foil, improves its oleophobic properties, and does not crowd out the proportion of other elements. Specifically, the mass percentage of Si in the corrosion-resistant coating can be, for example, 0.3 wt%, 0.6 wt%, 0.9 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2.1 wt%, or 2.5 wt%.

[0028] In some embodiments of this application, element A includes Zr. That is, the corrosion-resistant coating necessarily contains both Zr and Si. In particular, the presence of Zr is more conducive to improving the corrosion resistance of the coating, and can also simultaneously improve its wear resistance, reducing external mechanical damage to the battery, and thus improving the battery's safety performance and lifespan. In some specific embodiments, the mass percentage of Zr in the corrosion-resistant coating is 0.3wt% to 1.5wt%. Specifically, the mass percentage of Zr in the corrosion-resistant coating can be, for example, 0.3wt%, 0.6wt%, 0.9wt%, 1.2wt%, 1.5wt%, etc.

[0029] In some embodiments of this application, the resin accounts for 5 wt% to 15 wt% of the corrosion-resistant coating by mass; the Si element accounts for 0.28 wt% to 2.5 wt% of the corrosion-resistant coating by mass, and the Zr element accounts for 0.3 wt% to 1.5 wt% of the corrosion-resistant coating by mass. Thus, the corrosion-resistant coating possesses superior oleophobicity, strong resistance to electrolyte corrosion, and good wear resistance, and also helps to ensure a high interfacial adhesion between the corrosion-resistant coating and the aluminum foil.

[0030] Considering that in some cases the wear resistance requirement of the corrosion-resistant coating is not high, for example, in the application of aluminum-plastic film, the side facing the battery element is the inner surface, and the wear resistance requirement of the inner surface is not high. In this case, the Zr element can be contained in small amounts or not at all. Therefore, in some embodiments of this application, element A includes Si and Ti elements. Compared with Si, Ti element has a better effect on improving the corrosion resistance of the corrosion-resistant coating. In some specific embodiments, the mass percentage of resin in the corrosion-resistant coating is 5wt% to 15wt%; the mass percentage of Si element in the corrosion-resistant coating is 0.28wt% to 2.5wt%; the mass percentage of Ti element in the corrosion-resistant coating is 1.27wt% to 3wt%; and the mass percentage of Zr element in the corrosion-resistant coating is 0.3wt% to 1.5wt%.

[0031] In some other specific embodiments, considering the overall performance of the corrosion-resistant coating, element A includes elements Si, Ti, and Zr.

[0032] It is understood that the aluminum-plastic film includes a first surface and a second surface disposed opposite to each other. Considering the usage requirements, in some embodiments of this application, the aluminum-plastic film includes multiple corrosion-resistant coatings, including a first corrosion-resistant coating and a second corrosion-resistant coating; wherein, the first corrosion-resistant coating is disposed on the first surface, and the second corrosion-resistant coating is disposed on the aforementioned second surface. That is, the aluminum-plastic film includes a first corrosion-resistant coating, aluminum foil, and a second corrosion-resistant coating stacked together. Thus, when the aluminum-plastic film is used in secondary batteries, it can reduce the impact caused by electrolyte dripping onto the surface of the aluminum-plastic film during electrolyte injection, and also reduce the corrosion of the aluminum-plastic film by the electrolyte contained in the battery. In conjunction with the above usage scenarios, in some embodiments of this application, the first corrosion-resistant layer includes Zr element, and the mass content of Zr element in the first corrosion-resistant layer is greater than the mass content of Zr element in the second corrosion layer; in this case, there are two situations: 1) the second corrosion-resistant layer does not contain Zr element; 2) the second corrosion-resistant layer also contains Zr element; those skilled in the art can determine this according to production costs and usage requirements.

[0033] In some specific embodiments, the first corrosion-resistant coating includes Zr, Ti, and Si elements; in the first corrosion-resistant coating, the mass percentage of Zr is 0.3wt% to 1.5wt%, the mass percentage of Ti is 1.27wt% to 3wt%, and the mass percentage of Si is 0.28wt% to 2.5wt%. In some specific embodiments, the mass percentage of resin in the first corrosion-resistant coating is 5wt% to 15wt%. Thus, when the above-mentioned aluminum-plastic film is applied to a battery, the first corrosion-resistant coating is suitable for forming the surface of the aluminum-plastic film opposite to the battery element. Specifically, in the first corrosion-resistant layer, the mass percentage of Zr can be, for example, 0.3wt%, 0.5wt%, 0.8wt%, 1.0wt%, 1.1wt%, 1.2wt%, 1.3wt%, 1.4wt%, 1.5wt%, etc.; the mass percentage of Ti can be, for example, 1.3wt%, 1.5wt%, 2wt%, 2.5wt%, 3wt%, etc.; the mass percentage of Si can be, for example, 0.3wt%, 0.6wt%, 0.9wt%, 1.2wt%, 1.5wt%, 1.8wt%, 2.1wt%, 2.5wt%, etc.; and the mass percentage of resin can be, for example, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, etc.

[0034] In some specific embodiments, the second corrosion-resistant coating includes Ti and Si elements, and optionally Zr element; in the second corrosion-resistant coating, the mass percentage of Zr element is less than or equal to 1.2 wt%, the mass percentage of Ti element is 1.27 wt% to 3 wt%, and the mass percentage of Si element is 0.28 wt% to 2.5 wt%. In this case, in some specific embodiments, the mass percentage of resin in the second corrosion-resistant coating is 5 wt% to 15 wt%. Thus, when the above-mentioned aluminum-plastic film is applied to a battery, the second corrosion-resistant coating is suitable for forming the surface of the aluminum-plastic film facing the battery element. It should be noted that in some embodiments, for cost considerations, the second corrosion-resistant coating may not contain Zr element. Specifically, in the second corrosion-resistant coating, the mass percentage of Zr can be, for example, 0 wt%, 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, 1.0 wt%, or 1.2 wt%; the mass percentage of Ti can be, for example, 1.3 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, or 3 wt%; the mass percentage of Si can be, for example, 0.3 wt%, 0.6 wt%, 0.9 wt%, 1.2 wt%, 1.5 wt%, 1.8 wt%, 2.1 wt%, or 2.5 wt%; and the mass percentage of resin can be, for example, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, or 15 wt%. Considering the longer contact time and wider contact area between the second corrosion-resistant coating and the electrolyte, and the higher requirements for corrosion resistance, the thickness of the second corrosion-resistant coating is 20 μm-30 μm. Specifically, the thickness of the second corrosion-resistant layer can be, for example, 20μm, 22μm, 25μm, 28μm, 30μm, etc.

[0035] In some embodiments of this application, a nylon layer is further disposed between the first corrosion-resistant coating and the aluminum foil. This improves the heat resistance and tear resistance of the aluminum-plastic film, and further enhances battery performance. The material and thickness of the nylon layer can be materials and thicknesses well known to those skilled in the art, and this application does not limit them. Specifically, in some embodiments, the thickness of the nylon layer can be, for example, 10μm-30μm, and the material of the nylon layer can be, for example, nylon-6, or a composite of nylon-6 and PET, but is not limited thereto. Specifically, the thickness of the nylon layer can be, for example, 10μm, 12μm, 15μm, 20μm, 25μm, 30μm, etc.

[0036] In some embodiments of this application, the first corrosion-resistant coating is bonded to the nylon layer via an adhesive layer. The adhesive layer is made of one or more materials, including but not limited to polyurethane adhesives, acrylic adhesives, and epoxy adhesives. In some specific embodiments, the thickness of the adhesive layer can be, for example, 2 μm to 5 μm. Specifically, the thickness of the adhesive layer can be, for example, 2 μm, 3 μm, 4 μm, 5 μm, etc.

[0037] In some embodiments of this application, a heat-sealing layer is provided on the surface of the second corrosion-resistant coating facing away from the aluminum foil. Specifically, the heat-sealing layer can be any heat-sealing layer known to those skilled in the art. For example, the material of the heat-sealing layer includes cast polypropylene (CPP), and the thickness of the heat-sealing layer can be 40 μm-80 μm. In some specific embodiments, the heat-sealing layer is formed on the surface of the second corrosion-resistant coating by hot-pressing lamination, that is, the second corrosion-resistant coating and the heat-sealing layer are in direct contact. Specifically, the thickness of the heat-sealing layer can be, for example, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 70 μm, 80 μm, etc.

[0038] In some embodiments of this application, the thickness of the aluminum foil is 30μm-60μm. It is understood that elemental aluminum is easily oxidized, and the surface of the aluminum foil has a thin layer of aluminum oxide. Specifically, the thickness of the aluminum foil can be, for example, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, etc.

[0039] In some embodiments of this application, to further improve the corrosion resistance of the aluminum-plastic film, the aluminum-plastic film also includes a third corrosion-resistant coating, which is disposed between the aluminum foil and the nylon layer. That is, please refer to [link to relevant documentation]. Figure 2 The aluminum-plastic film 1 comprises a first corrosion-resistant coating 201, a nylon layer 30, a third corrosion-resistant coating 203, an aluminum foil 10, a second corrosion-resistant coating 202, and a heat-sealing layer 40, which are sequentially stacked. In some specific embodiments, the aforementioned adhesive layers (not shown in the figures) are provided between the first corrosion-resistant coating 201 and the nylon layer 30, and between the third corrosion-resistant coating 203 and the nylon layer 30. Similarly, the thickness of the third corrosion-resistant coating is 20μm-30μm. Specifically, the thickness of the third corrosion-resistant layer can be, for example, 20μm, 22μm, 25μm, 28μm, 30μm, etc.

[0040] To reduce the difficulty of preparing corrosion-resistant coatings, in some embodiments of this application, a small amount of additives is added to the raw materials of the corrosion-resistant coating. These additives may remain in the corrosion-resistant coating, but will not affect its performance. In some specific embodiments, the additives include defoamers and leveling agents; these can be commonly used defoamers and leveling agents in resin materials. Therefore, in some embodiments of this application, the corrosion-resistant coating also includes the aforementioned additives.

[0041] In some embodiments of this application, a catalyst is added during the preparation of the corrosion-resistant coating to adjust the pH value of the hydrolysis environment involved in the preparation of the corrosion-resistant coating and to adjust the hydrolysis reaction activity of the sol. The catalyst includes, but is not limited to, one or more of glacial acetic acid, formic acid, nitric acid, and phosphoric acid.

[0042] This application also provides a method for preparing a corrosion-resistant coating, which can be used to prepare the aluminum-plastic film provided in this application, including:

[0043] S1. Mix silane coupling agent, Ti element source and / or Zr element source and water to obtain a mixture;

[0044] S2. The mixture is formed on at least one side of the aluminum foil and cured to form a corrosion-resistant coating to obtain an aluminum-plastic film; the corrosion-resistant coating includes element A, which is selected from at least one of element Ti and element Zr and element Si.

[0045] Silane coupling agents can catalyze the hydrolysis of Ti and / or Zr source elements, and Si element is also released after the silane coupling agent participates in the catalysis, thereby forming a corrosion-resistant coating. The above preparation method is simple and easy to implement, with high process reliability and high production efficiency, and is suitable for large-scale industrial production.

[0046] In some embodiments of this application, the mass percentage of the silane coupling agent is 15.2 wt% to 27 wt%, based on the mass of the mixture. Specifically, the mass percentage of the silane coupling agent in the mixture can be, for example, 15.2 wt%, 16 wt%, 18 wt%, 20 wt%, 22 wt%, 25 wt%, 27 wt%, etc.

[0047] In some embodiments of this application, the water content is 2.3 wt% to 13.5 wt% based on the mass of the mixture. Specifically, the water content in the mixture can be, for example, 2.3 wt%, 2.5 wt%, 3 wt%, 5 wt%, 8 wt%, 10 wt%, 12 wt%, 13 wt%, 13.5 wt%, etc.

[0048] In some embodiments of this application, based on the mass of the mixture, the sum of the masses of the Ti element source and the Zr element source accounts for 38wt%-63wt% of the mass of the mixture. Specifically, the percentage of the sum of the masses of the Ti element source and the Zr element source in the mixture can be, for example, 38wt%, 40wt%, 42wt%, 45wt%, 48wt%, 50wt%, 52wt%, 55wt%, 58wt%, 60wt%, 62wt%, 63wt%, etc.

[0049] In some embodiments of this application, the Ti element source includes one or more of tetrabutyl titanate, tetraethyl titanate, and tetraisopropyl titanate. Hydrolysis of the above substances can form a titanium sol. For example, the chemical formula of completely hydrolyzed tetrabutyl titanate is shown below, where R is butyl:

[0050] Of course, the hydrolysis of Ti element source is also accompanied by a condensation reaction, specifically Ti-OH reacts with Ti-OH to generate Ti-O-Ti bonds, so that the final corrosion-resistant coating includes compounds containing Ti-O-Ti bonds.

[0051] In some embodiments of this application, the Zr source includes one or more zirconium compounds capable of synthesizing olefin functional groups, such as zirconium propoxide (tetra-n-propyl zirconate), zirconium butoxide, zirconium tert-butoxide, and zirconium tetraethoxylate. The above-mentioned Zr source can be hydrolyzed to form zirconium sol. Specifically, taking zirconium propoxide as an example, the chemical formula of the completely hydrolyzed Zr source is shown below:

[0052] Of course, the hydrolysis of Zr element source is also accompanied by a condensation reaction, specifically the reaction of Zr-OH with Zr-OH to generate Zr-O-Zr bonds, so that the final corrosion-resistant coating includes compounds containing Zr-O-Zr bonds.

[0053] In some embodiments of this application, step S1 includes: mixing a silane coupling agent, a Ti element source and / or a Zr element source, water, and a resin raw material to obtain a mixture. Specifically, the resin raw material can be the resin itself, or a prepolymer or even a monomer used for formation. In this case, step S1 includes: mixing the silane coupling agent, the Ti element source and / or a Zr element source, the resin raw material, and water, including:

[0054] S101, mix Ti element source, water and silane coupling agent to obtain Ti sol; and / or, mix Zr element source, water and the silane coupling agent to obtain Zr sol;

[0055] S102. Mix the Ti sol and the resin raw material; or, mix the Zr sol and the resin raw material; or, first mix the Ti sol and the Zr-Ti composite sol to obtain a Zr-Ti composite sol, then mix the Zr-Ti composite sol and the resin raw material to obtain the mixture. The silane coupling agent can catalyze the hydrolysis of the Ti element source and / or the Zr element source. The generated hydrolysis products can be dispersed in the resin raw material, and after the silane coupling agent participates in the catalysis, Si elements will also be released and dispersed in the resin raw material together with Ti elements and / or Zr elements, ultimately forming a corrosion-resistant coating.

[0056] In some embodiments of this application, the mass ratio of the resin raw material to the mixture is 5wt%-15wt%. Specifically, the mass of the resin raw material can be 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, etc., of the mixture.

[0057] In step S102, after mixing the Ti sol and Zr sol, a reaction can occur between the Ti-OH bonds and the Zr-OH bonds to generate Ti-O-Zr bonds, thus the final corrosion-resistant coating includes a compound containing Ti-O-Zr bonds. Alternatively, Zr-OH can react with Zr-OH to generate Zr-O-Zr bonds, or Ti-OH can react with Ti-OH to generate Ti-O-Ti bonds. Therefore, the final corrosion-resistant coating may include a compound containing at least one of the following chemical bonds: Ti-O-Zr bonds, Zr-O-Zr bonds, and / or Ti-O-Ti bonds.

[0058] In some embodiments of this application, step S1 includes: mixing a silane coupling agent, a Ti element source and / or a Zr element source, water, and a first silicon source; the first silicon source is selected from one or more of tetraethyl orthosilicate, silicate ester, and organosilane polymers. In some specific embodiments, the first silicon source accounts for 3 wt% to 9.5 wt% of the mass of the mixture. It should be noted that although the silane coupling agent can provide silicon for the final corrosion-resistant coating, it is only for ease of description; therefore, the silane coupling agent is not included when discussing the relevant parameters and properties of the first silicon source. In this case, the preparation of the aluminum-plastic film includes:

[0059] S111: Mix Ti element source, water, and the silane coupling agent to obtain Ti sol; mix Zr element source, water, and the silane coupling agent to obtain Zr sol; mix Si element source, water, and the silane coupling agent to obtain Si sol.

[0060] S112. First, mix the Ti sol, the Si sol and the Ti sol to obtain a Zr-Ti-Si composite sol, then mix the Zr-Ti-Si composite sol and the resin raw material to obtain the mixture;

[0061] S2. The mixture is formed on at least one side of the surface of the aluminum foil and cured to form a corrosion-resistant coating, thereby obtaining an aluminum-plastic film.

[0062] In some embodiments of this application, in step S112, an alcohol reagent such as ethanol (e.g., anhydrous ethanol) is added during the preparation of the Ti sol. This allows the inorganic components to be more dispersed and slows down the hydrolysis rate of the inorganic components in deionized water, preventing clumping. Specifically, the preparation of the Ti sol includes: mixing a Ti element source, water, a silane coupling agent, and ethanol to obtain a first mixture, stirring, and obtaining the Ti sol. Based on the mass of the first mixture, the mass percentages of water are 3wt%–15wt%, the silane coupling agent is 20wt%–30wt%, the ethanol is 25wt%–40wt%, and the Ti element source is 30wt%–40wt%. In some specific embodiments, the stirring time is 50-90 minutes. This facilitates the complete hydrolysis of the Ti element source, improving the formation of chemical bonds between the Ti element and the resin, specifically facilitating the formation of chemical bonds between the Ti element and the resin, thereby optimizing the quality of the final corrosion-resistant coating.

[0063] In some specific embodiments, a catalyst is also added during the preparation of Ti sol; the catalyst accounts for 0.3 wt% to 1 wt% of the mass of the first mixture. The catalyst can adjust the pH of the hydrolysis environment involved in the preparation of the corrosion-resistant coating and adjust the hydrolysis reaction activity of the sol. The catalyst includes, but is not limited to, one or more of glacial acetic acid, formic acid, nitric acid, and phosphoric acid.

[0064] Similarly, in some embodiments of this application, ethanol (e.g., anhydrous ethanol) is also added in step S112 when preparing the Zr sol. Specifically, the preparation of the Zr sol includes: mixing a Zr element source, water, a silane coupling agent, and ethanol to obtain a first mixture, stirring, and obtaining the Zr sol. Based on the mass of the first mixture, the mass percentage of water is 3wt%–15wt%, the mass percentage of the silane coupling agent is 20wt%–30wt%, the mass percentage of ethanol is 25wt%–40wt%, and the mass percentage of the Zr element source is 20wt%–30wt%. This facilitates the complete hydrolysis of the Zr element source, which can improve the formation of chemical bonds between the Zr element and the resin, specifically facilitating the formation of chemical bonds between the Zr element and the resin, thereby optimizing the quality of the final corrosion-resistant coating. Similarly, the stirring time is 50-90 minutes. In some embodiments, the aforementioned catalyst is added to the system when preparing the Si sol.

[0065] Similarly, in some embodiments of this application, ethanol (e.g., anhydrous ethanol) is also added in step S112 when preparing the Si sol. Specifically, the preparation of the Si sol includes: mixing a first silicon source, water, a silane coupling agent, and ethanol to obtain a first mixture, stirring, and obtaining the Si sol. Based on the mass of the first mixture, the mass percentage of water is 3wt%–15wt%, the mass percentage of the silane coupling agent is 20wt%–30wt%, the mass percentage of ethanol is 25wt%–40wt%, and the mass percentage of the first silicon source is 20wt%–30wt%. Similarly, the stirring time is 50 min–90 min. In some embodiments, the aforementioned catalyst is added to the system when preparing the Si sol.

[0066] In some embodiments of this application, in step S112, the following reaction may occur after the Ti sol, Si sol, and Zr sol are mixed:

[0067]

[0068] Thus, the compounds included in the Zr-Ti-Si composite sol include Ti-O-Zr bonds and Si-O-Ti bonds. It is understood that the above formula is only one of many possible reactions, merely an example. Specifically, reactions could occur between two Zr-OH bonds, between two Ti-OH bonds, or between two Si-OH bonds. Therefore, the final Zr-Ti-Si composite sol may include one or more of the following: Ti-O-Zr bonds, Si-O-Ti, Si-O-Zr bonds, Zr-O-Zr, Ti-O-Ti bonds, and Si-O-Si bonds. Furthermore, these compounds can further form chemical bonds with organic raw materials (e.g., resins).

[0069] It is understood that in the embodiments of this application, the components and their contents in the corrosion-resistant coating can be adjusted as needed. Therefore, its preparation can also be adjusted accordingly based on the expected parameters of the corrosion-resistant coating. The relative amounts of Ti sol, Zr sol, Si sol, composite sol (including any two of Ti sol, Zr sol, and Si sol, or Ti-Zr-Si sol) and resin raw materials (e.g., resin) can be selected according to the expected component contents. In some specific embodiments, titanium sol can be slowly added to silica sol and stirred evenly to obtain a silicon-titanium composite sol. Then, zirconium sol intermediate can be slowly added to the aforementioned prepared silicon-titanium sol and stirred evenly to obtain a Zr-Ti-Si composite sol. The amounts of titanium sol, silica sol, and zirconium sol can be selected as needed. In some cases, the mass ratio of titanium sol, silica sol, and zirconium sol is (1.143-3):1:(0.286-1.5).

[0070] In some embodiments of this application, in step S112 above, the resin and Zr-Ti-Si composite sol are mixed in a mass ratio of 1:(5-18). Thus, the resulting corrosion-resistant coating possesses superior corrosion resistance, mechanical properties, and hydrophobic properties.

[0071] In some embodiments of this application, in step S112 above, in order to cure the resin raw material and even form a cross-linked network structure, the mixture also includes a curing agent, and the mass ratio of the curing agent to the resin raw material is (0.3-1.0):(5-15). In the embodiments of this application, the curing agent can be determined according to the type of resin raw material selected, and can be a curing agent suitable for the corresponding resin raw material that is well known to those skilled in the art, such as a thermosetting agent, a photocuring agent, etc. In some specific embodiments, a photocuring agent is selected; in this case, the curing mentioned in step S2 is a photocuring treatment, and the specific parameters of the photocuring treatment can be determined according to the selected resin and curing agent, which is not limited in this application.

[0072] Furthermore, in some specific embodiments, the mixture also includes rare earth additives and other auxiliaries, such as leveling agents and defoamers. The mass ratio of rare earth additives to resin is 1:(1-7.9), and the mass ratio of other auxiliaries to resin is 1:(1.1-16.7).

[0073] In some embodiments of this application, step S2, between forming the mixture on the surface of the aluminum foil, further includes roughening the aluminum foil. The roughening process described above can be any roughening process known in the art.

[0074] In some embodiments of this application, step S2, the process of forming the mixture on the surface of the aluminum foil, includes coating. The coating process can be any parameters well known to those skilled in the art.

[0075] It is understood that the aluminum foil has a first surface and a second surface arranged opposite to each other in the thickness direction. In some embodiments of this application, in order to further optimize the overall performance of the aluminum-plastic film, a nylon layer, a heat-sealing layer, etc., are also formed in the aluminum-plastic film.

[0076] In some specific embodiments, step S2 includes:

[0077] S21. A nylon layer, a first adhesive layer, and a first corrosion-resistant coating are sequentially formed on the first surface of the aluminum foil;

[0078] A second corrosion-resistant coating is formed on the second surface of the aluminum foil, and the aforementioned heat-sealing layer is formed by hot-pressing the second corrosion-resistant coating onto the surface of the coating.

[0079] In some specific embodiments of this application, step S21 further includes, before forming the nylon layer, forming a third corrosion-resistant coating and a second adhesive layer sequentially on the first surface of the aluminum foil.

[0080] This application also provides a battery, including the aluminum-plastic film provided in this application embodiment. Because it uses the aluminum-plastic film provided in this application embodiment as encapsulation, the battery has high safety performance and a long service life.

[0081] In some embodiments of this application, the battery further includes a positive electrode, a negative electrode, and an electrolyte disposed in an aluminum-plastic film.

[0082] In some embodiments of this application, when the aluminum-plastic film comprises a first corrosion-resistant coating, a nylon layer, an aluminum foil, and a second corrosion-resistant coating stacked sequentially, the first corrosion-resistant coating is disposed on the side facing away from the positive electrode, the negative electrode, and the electrolyte. In some specific embodiments, an adhesive layer is also provided between the first corrosion-resistant coating and the nylon layer. Furthermore, a third corrosion-resistant coating is disposed between the nylon layer and the aluminum foil, and the third corrosion-resistant coating is disposed close to the aluminum foil.

[0083] In some embodiments of this application, the battery can be any alkali metal ion battery such as a lithium-ion battery, sodium-ion battery, or magnesium-ion battery.

[0084] In some embodiments of this application, the battery described above is a liquid battery using a liquid electrolyte. Of course, it can also be a solid-state battery or a semi-solid-state battery.

[0085] In some embodiments of this application, the aforementioned positive electrode, negative electrode, and electrolyte can be any known positive electrode, negative electrode, and electrolyte suitable for the corresponding battery. Of course, the battery may also include other battery elements for forming electronic and ion pathways.

[0086] This application also provides an electrical device, including the battery provided in this application embodiment. Because it is powered by the battery provided in this application embodiment, this electrical device has a promising market prospect.

[0087] In some embodiments of this application, the aforementioned electrical equipment includes, but is not limited to, vehicles, or 3C electronic consumer products such as mobile phones, laptops, tablets, and smartwatches.

[0088] The technical solution of this application will be described in detail below with reference to several embodiments.

[0089] Example 1

[0090] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol, deionized water and catalyst (specifically glacial acetic acid) in a mass ratio of 29.5:20:40:10:0.5 were mixed evenly and stirred for 60 min to obtain silica sol.

[0091] Preparation of titanium sol: Silane coupling agent, tetrabutyl titanate, anhydrous ethanol, deionized water and catalyst (specifically glacial acetic acid) in a mass ratio of 29.5:30:30:10:0.5 were mixed evenly and stirred for 60 min to obtain titanium sol.

[0092] Preparation of zirconium sol: A silane coupling agent, zirconium n-propoxide, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:20:40:10:0.5 and stirred for 60 min to hydrolyze to obtain zirconium sol.

[0093] (2) Preparation of silicon-titanium-zirconium composite sol: Weigh titanium sol, silica sol and zirconium sol in a mass ratio of 60:30:10, slowly add titanium sol to silica sol, stir evenly to obtain silicon-titanium sol, and then slowly add zirconium sol to the silicon-titanium sol prepared above, stir evenly to obtain silicon-titanium-zirconium composite sol.

[0094] (3) Weigh out silicon-titanium zirconium sol, rare earth additive (specifically cerium nitrate), acrylic resin, and additives (specifically defoamer and leveling agent) in a mass ratio of 85:4:10:1. Slowly add the rare earth additive, acrylic resin, and additives to the silicon-titanium sol and stir for 30 minutes to obtain a mixture. Coat the mixture on both sides of the roughened aluminum foil with a thickness of 20 μm. Cure at room temperature for 1 hour to achieve surface dryness and 24 hours to achieve hard dryness. Then, heat-press the coated aluminum foil and heat-sealing layer together. Adhere the coating to the outer nylon layer using an adhesive layer. Finally, coat the nylon layer with the above mixture with a thickness of 3 μm. Cure at room temperature for 1 hour to achieve surface dryness and 24 hours to achieve hard dryness to obtain the aluminum-plastic film.

[0095] Example 2

[0096] The difference from Example 1 is as follows:

[0097] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:30:30:10:0.5 and stirred for 60 min to hydrolyze to obtain silica sol.

[0098] Preparation of titanium sol: Silane coupling agent, tetrabutyl titanate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:40:20:10:0.5 and stirred for 60 min to hydrolyze to obtain titanium sol.

[0099] Preparation of zirconium sol: Silane coupling agent, zirconium n-propoxide, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:30:30:10:0.5 and stirred for 60 min to hydrolyze to obtain zirconium sol.

[0100] (2) Preparation of silicon-titanium-zirconium composite sol: Weigh titanium sol, silica sol and zirconium sol in a mass ratio of 60:30:10, slowly add titanium sol to silica sol, stir evenly to obtain silicon-titanium sol, and then slowly add zirconium sol intermediate to the silicon-titanium sol prepared above, stir evenly to obtain silicon-titanium-zirconium composite sol.

[0101] Example 3

[0102] The difference from Example 1 is as follows:

[0103] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:25:35:10:0.5 and stirred for 60 min to hydrolyze to obtain silica sol.

[0104] Preparation of titanium sol: Silane coupling agent, tetrabutyl titanate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:35:25:10:0.5 and stirred for 60 min to hydrolyze to obtain titanium sol.

[0105] Preparation of zirconium sol: A silane coupling agent, zirconium n-propoxide, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:25:35:10:0.5 and stirred for 60 min to hydrolyze to obtain zirconium sol.

[0106] (2) Preparation of silicon-titanium-zirconium composite sol: Weigh titanium sol, silica sol and zirconium sol in a mass ratio of 60:30:10, slowly add titanium sol to silica sol, stir evenly to obtain silicon-titanium sol, and then slowly add zirconium sol to the silicon-titanium sol prepared above, stir evenly to obtain silicon-titanium-zirconium composite sol.

[0107] Example 4

[0108] The difference from Example 1 is as follows:

[0109] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:20:40:10:0.5 and stirred for 60 min to hydrolyze to obtain silica sol.

[0110] Preparation of titanium sol: Silane coupling agent, tetrabutyl titanate, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:30:30:10:0.5 and stirred for 60 min to hydrolyze to obtain titanium sol.

[0111] Preparation of zirconium sol: Silane coupling agent, zirconium n-propoxide, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:30:30:10:0.5 and stirred for 60 min to hydrolyze to obtain zirconium sol.

[0112] (2) Preparation of silicon-titanium-zirconium composite sol: Weigh titanium sol, silica sol and zirconium sol in a mass ratio of 60:30:10, slowly add titanium sol to silica sol, stir evenly to obtain silicon-titanium sol, and then slowly add zirconium sol to the silicon-titanium sol prepared above, stir evenly to obtain silicon-titanium-zirconium composite sol.

[0113] Example 5

[0114] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol and deionized water catalyst (specifically glacial acetic acid) in a mass ratio of 29.5:20:40:10:0.5 were mixed evenly and stirred for 60 min to obtain silica sol.

[0115] Preparation of titanium sol: Silane coupling agent, tetrabutyl titanate, anhydrous ethanol, deionized water and catalyst (specifically glacial acetic acid) in a mass ratio of 29.5:30:30:10:0.5 were mixed evenly and stirred for 60 min to obtain titanium sol.

[0116] (2) Preparation of silicon-titanium composite sol: Weigh titanium sol and silica sol in a mass ratio of 70:30, slowly add titanium sol to silica sol, stir evenly to obtain silicon-titanium composite sol.

[0117] (3) Weigh out the silicon-titanium composite sol, rare earth additive (specifically cerium nitrate), acrylic resin, and auxiliary agents (specifically defoamer and leveling agent) in a mass ratio of 85:4:10:1. Slowly add the rare earth additive, acrylic resin, and auxiliary agents to the silicon-titanium sol and stir for 30 minutes to obtain a mixture. Coat the mixture on both sides of the roughened aluminum foil with a thickness of 20 μm. Cure at room temperature for 1 hour to achieve surface dryness and 24 hours to achieve hard dryness. Then, heat-press the coated aluminum foil and heat-sealing layer together. Adhere the coating to the outer nylon layer using an adhesive layer. Finally, coat the nylon layer with the above mixture with a thickness of 3 μm. Cure at room temperature for 1 hour to achieve surface dryness and 24 hours to achieve hard dryness to obtain the aluminum-plastic film.

[0118] Example 6

[0119] (1) Preparation of silica sol: Silane coupling agent, tetraethyl orthosilicate, anhydrous ethanol and deionized water catalyst (specifically glacial acetic acid) in a mass ratio of 29.5:20:40:10:0.5 were mixed evenly and stirred for 60 min to obtain silica sol.

[0120] Preparation of zirconium sol: A silane coupling agent, zirconium n-propoxide, anhydrous ethanol, deionized water and catalyst were mixed evenly in a mass ratio of 29.5:20:40:10:0.5 and stirred for 60 min to hydrolyze to obtain zirconium sol.

[0121] (2) Preparation of silicon-zirconium composite sol: Weigh silicon sol and zirconium sol in a mass ratio of 75:25, slowly add zirconium sol to the silicon-titanium sol prepared above, and stir evenly to obtain silicon-zirconium composite sol.

[0122] (3) Weigh out silicon-zirconium composite sol, rare earth additive (specifically cerium nitrate), acrylic resin, and additives (specifically defoamer and leveling agent) in a mass ratio of 85:4:10:1. Slowly add the rare earth additive, acrylic resin, and additives to the silicon-titanium sol and stir for 30 minutes to obtain a mixture. Coat the mixture on both sides of the roughened aluminum foil with a thickness of 20 μm. Cure at room temperature for 1 hour to surface dry and 24 hours to fully dry. Then, heat-press the coated aluminum foil and heat-sealing layer together. Adhere the coating to the outer nylon layer with an adhesive layer. Finally, coat the nylon layer with the above mixture with a thickness of 3 μm. Cure at room temperature for 1 hour to surface dry and 24 hours to fully dry to obtain the aluminum-plastic film.

[0123] Comparative Example 1

[0124] The commercially available aluminum-plastic film comprises, in sequence, a nylon outer layer, an outer adhesive layer, an Al outer treatment layer, an aluminum foil layer, an Al inner treatment layer, an inner adhesive layer, and a polypropylene layer.

[0125] Comparative Example 2

[0126] The difference from Example 1 is that the corrosion-resistant coating does not contain Si.

[0127] Comparative Example 3

[0128] The difference from Example 1 is that the corrosion-resistant coating is an acrylic resin layer.

[0129] Comparative Example 4

[0130] The difference from Example 1 is that the corrosion-resistant coating is an acrylic resin layer containing Si.

[0131] Performance testing

[0132] (1) Abrasion resistance test: The test was conducted in accordance with the standard GB / T 6739-2006.

[0133] (2) Strength test: The test shall be conducted in accordance with the standard GB / T 1732-93.

[0134] (3) Flexibility test: The test shall be conducted in accordance with the standard GB / T 1731-1993.

[0135] (4) Contact angle test: 5 μL of ethylene glycol was dropped onto the surface of the aluminum-plastic film with corrosion-resistant coating in each embodiment and comparative example using a microsyringe. The surface contact angle was calculated using the five-point fitting method. The obtained contact angle was the average of the five measured contact angles. When the contact angle was >90°, it indicated that the aluminum-plastic film was oleophobic, and when it was <90°, it indicated that the aluminum-plastic film was oleophilic.

[0136] (5) Corrosion Resistance Test: The aluminum-plastic films of Examples 1-6 and Comparative Examples 1-4 were made into aluminum-plastic film bags, with the heat-sealing layer on one side serving as the inner surface of the bag. The same amount of the same electrolyte was injected into the bag, and the bags were placed in an environment of 200°C for accelerated testing. Then, aluminum foil was separated from the aluminum-plastic film using an aluminum-plastic film stripping solution. The separated aluminum foil was then placed on graph paper (coordinate interval 1cm*cm), and photographed using a digital camera. A uniform 3cm*2cm area was cropped, and the image (3cm*2cm) and the pixels of the corroded area were obtained using software. Finally, the corrosion area was calculated.

[0137] The formula for calculating the corrosion area is: (corrosion area pixels / image pixels) * 3cm * 2cm. The results are summarized in Table 1 and Table 2.

[0138] For each of the above tests, two samples of aluminum-plastic film from each embodiment or comparative example were taken for testing.

[0139] Table 1

[0140]

[0141] Table 2

[0142]

[0143] Combining the data in Tables 1 and 2, it can be found that the corrosion resistance of the aluminum-plastic film provided in this application embodiment is significantly better than that of the comparative example. Furthermore, the hardness, flexibility, and resistance to high-temperature electrolyte immersion of the aluminum-plastic film in the embodiment all meet the usage standards and have a certain degree of oleophobicity. Moreover, when the corrosion-resistant layer of the aluminum-plastic film contains Si, Ti, and Zr elements simultaneously (Examples 1-4), the corrosion resistance is even stronger.

[0144] The above description is an exemplary embodiment of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An aluminum-plastic film, characterized in that, The material includes an aluminum foil and a corrosion-resistant coating disposed on at least one surface of the aluminum foil; the corrosion-resistant coating includes a compound containing AOA bonds, wherein the A element is selected from Ti, Zr, and Si; the AOA bonds include Ti-O-Zr bonds and Zr-O-Zr bonds; Based on the mass of the corrosion-resistant coating, the mass percentage of Ti is 1.27wt% to 3wt%, the mass percentage of Zr is 0.3wt% to 1.5wt%, and the mass percentage of Si is 0.28wt% to 2.5wt%.

2. The aluminum-plastic film according to claim 1, characterized in that, The corrosion-resistant coating also includes a resin; The resin includes one or more of acrylic resin, polyurethane resin, fluorocarbon resin and epoxy resin.

3. The aluminum-plastic film according to claim 2, characterized in that, The resin accounts for 5 wt% to 15 wt% of the mass of the corrosion-resistant coating.

4. The aluminum-plastic film according to claim 2 or 3, characterized in that, The compound containing AOA bonds forms chemical bonds with the resin; the AOA bonds include Si-O-Ti bonds, Si-O-Zr bonds, and Si-O-Si bonds.

5. The aluminum-plastic film according to any one of claims 1-4, characterized in that, The aluminum-plastic film includes a plurality of the corrosion-resistant coatings, and the aluminum foil includes a first surface and a second surface disposed opposite to each other; The plurality of corrosion-resistant coatings include a first corrosion-resistant coating and a second corrosion-resistant coating; wherein, the first corrosion-resistant coating is disposed on the first surface, and the second corrosion-resistant coating is disposed on the second surface; The first corrosion-resistant coating includes Zr, and the mass content of Zr in the first corrosion-resistant coating is greater than the mass content of Zr in the second corrosion-resistant coating.

6. The aluminum-plastic film according to claim 5, characterized in that, The first corrosion-resistant coating comprises Ti, Zr, and Si elements; in the first corrosion-resistant coating, the Zr element accounts for 0.3 wt% to 1.5 wt% by mass, the Ti element accounts for 1.27 wt% to 3 wt% by mass, and the Si element accounts for 0.28 wt% to 2.5 wt% by mass; and / or, The second corrosion-resistant coating comprises Ti, Si, and Zr elements; in the second corrosion-resistant coating, the mass percentage of Zr element is ≤1.3wt%, the mass percentage of Ti element is 1.27wt% to 3wt%, and the mass percentage of Si element is 0.28wt% to 2.5wt%.

7. The aluminum-plastic film according to claim 5 or 6, characterized in that, The aluminum-plastic film also includes a nylon layer; the nylon layer is disposed between the first corrosion-resistant coating and the aluminum foil.

8. The aluminum-plastic film according to claim 7, characterized in that, The aluminum-plastic film further includes a third corrosion-resistant coating; the third corrosion-resistant coating is disposed between the nylon layer and the aluminum foil; The third corrosion-resistant coating includes Ti, Si, and optionally Zr; in the third corrosion-resistant coating, the mass percentage of Zr is ≤1.3wt%, the mass percentage of Ti is 1.27wt% to 3wt%, and the mass percentage of Si is 0.28wt% to 2.5wt%.

9. The aluminum-plastic film according to any one of claims 6-8, characterized in that, The thickness of the first corrosion-resistant coating is 1μm-5μm, and the thickness of the second corrosion-resistant coating is 20μm-30μm.

10. The aluminum-plastic film according to claim 8, characterized in that, The thickness of the third corrosion-resistant coating is 20μm-30μm.

11. The aluminum-plastic film according to claim 8 or 10, characterized in that, An adhesive layer is provided between the first corrosion-resistant coating and the nylon layer, and between the third corrosion-resistant coating and the nylon layer.

12. A method for preparing an aluminum-plastic film, characterized in that, include: A mixture is obtained by mixing a Ti element source, a Zr element source, a silane coupling agent, and water; the mixture is formed on at least one side of an aluminum foil and cured to form a corrosion-resistant coating as described in any one of claims 1-11, thereby obtaining an aluminum-plastic film.

13. The preparation method according to claim 12, characterized in that, The Ti element source includes one or more of tetrabutyl titanate, tetraethyl titanate, and tetraisopropyl titanate; and / or, The Zr element source includes one or more of zirconium n-propoxide, zirconium n-butoxide, zirconium tert-butoxide, and zirconium tetraethoxy.

14. The preparation method according to claim 12 or 13, characterized in that, The mixing process also includes the addition of resin raw materials.

15. The preparation method according to claim 14, characterized in that, The mixing process further includes the addition of a first silicon source, which includes one or more of tetraethyl orthosilicate, silicate ester, and organosilane polymer.

16. The preparation method according to claim 15, characterized in that, Based on the total mass of the mixture, the silane coupling agent accounts for 15.2 wt%-27 wt% of the mass, the water accounts for 2.3 wt%-13.5 wt% of the mass, the sum of the mass of the Ti element source and the Zr element source accounts for 38 wt%-63 wt%, the resin raw material accounts for 5 wt%-15 wt% of the mass of the mixture, and the first silicon source accounts for 3 wt%-9.5 wt% of the mass of the mixture.

17. A battery, characterized in that, Includes aluminum-plastic film, wherein the aluminum-plastic film is the aluminum-plastic film according to any one of claims 1-11.

18. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 17.

Images