Aluminum-plastic film and application thereof

Abstract

This application relates to the field of aluminum-plastic film, specifically disclosing an aluminum-plastic film and its applications. The film comprises, arranged in order from the outside inward, a protective layer, an outer adhesive layer, a corrosion-resistant layer, an aluminum foil layer, a corrosion-resistant layer, an inner adhesive layer, and a heat-seal layer. A flame retardant layer is further provided between the corrosion-resistant layer and the aluminum foil layer. The flame retardant layer is a composite layer of hollow nickel silicate microcapsules and an acrylate resin. By adjusting the type and thickness of the raw materials of each layer of the aluminum-plastic film, the resulting aluminum-plastic film achieves a flame retardancy rating and LOI of up to V0 and 42.6%, respectively, exhibiting high flame retardancy and long-term flame retardancy.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum-plastic films, and more specifically, to an aluminum-plastic film and applications thereof. Background Art

[0002] With the rapid development of portable electronics, electric vehicles, energy storage power stations, and other fields, lithium-ion batteries have become the preferred chemical power source due to their high energy density, high operating voltage, low self-discharge, and long cycle life. With product upgrades, people's requirements for the energy density of lithium-ion batteries are becoming increasingly higher, but safety performance has not been upgraded in parallel. In actual use, safety accidents occur frequently. This is mainly due to the shrinkage and embrittlement of the lithium-ion battery diaphragm when exposed to high temperatures, drops, etc., resulting in thermal runaway such as short circuit contact between the cathode and anode, causing battery fire and even explosion. For power batteries with larger capacity, safety performance is even more important. Flame retardant properties can reduce the occurrence and spread of fire accidents, protecting personal and property safety.

[0003] In the related art, the flame retardant performance of aluminum-plastic film is improved by placing a flame retardant between the outer protective layer and the adhesive layer. During the long-term use of the battery, the flame retardant performance will gradually decrease, which will pose a great safety hazard in the later stage of battery use. Summary of the Invention

[0004] In order to improve the long-term flame retardant performance of an aluminum-plastic film, the present application provides an aluminum-plastic film.

[0005] In a first aspect, the present application provides an aluminum-plastic film, which adopts the following technical solution:

[0006] An aluminum-plastic film comprises a protective layer, an outer adhesive layer, a corrosion-resistant treatment layer, an aluminum foil layer, a corrosion-resistant treatment layer, an inner adhesive layer and a heat-sealing layer, which are arranged in sequence from the outside to the inside; a flame retardant treatment agent layer is also included between the corrosion-resistant treatment layer and the aluminum foil layer; the flame retardant treatment agent layer is a composite layer of hollow nickel silicate microcapsules and acrylate resin.

[0007] By adopting the above technical scheme, the aluminum-plastic film is provided with a protective layer and is located in the outermost layer of the aluminum-plastic film, which is mainly used to protect the surface of the film from damage by the external environment, such as moisture, pollution, etc. The outer adhesive layer is located between the protective layer and the corrosion-resistant treatment layer, and is used to bond the protective layer and the corrosion-resistant treatment layer, thereby strengthening the overall structural strength of the aluminum-plastic film. The corrosion-resistant treatment layer is located between the outer adhesive layer and the aluminum foil layer, and has corrosion resistance, which can protect the aluminum foil layer from the erosion of external corrosive media. The aluminum foil layer is the core layer of the aluminum-plastic film and has a high melting point and thermal conductivity, which can stop the propagation of flames and the accumulation of heat. The inner adhesive layer is used to bond the aluminum foil layer and the heat-sealing layer, thereby strengthening the overall structural strength of the aluminum-plastic film. The heat-sealing layer has good heat-sealing properties and can make the aluminum-plastic film form a firm seal in the heat-sealing process.

[0008] The flame retardant treatment agent layer is located between the corrosion-resistant treatment layer and the aluminum foil layer, which can improve the flame retardant properties of the aluminum-plastic film. The flame retardant treatment agent layer is a composite layer of hollow nickel silicate microcapsules and acrylate resin. The hollow nickel silicate microcapsules use hollow nickel silicate as a core material and phenolic resin as a wall material. The hollow nickel silicate will undergo a carbonization reaction at high temperature to generate a stable carbonized layer with high thermal stability and barrier properties, which can isolate oxygen and heat sources. The carbonization and thermal decomposition reactions of the hollow nickel silicate are both endothermic reactions, which will absorb heat from the surrounding environment, can reduce the surrounding temperature, and play a flame retardant role. In addition, the hollow structure can effectively isolate heat conduction and reduce heat radiation, thereby reducing the temperature rise rate of the material and improving the flame retardant properties of the material. Phenolic resin (PF) is not only easy to obtain raw materials, low in price, and simple to process, but the cured resin material also has the advantages of heat resistance and ablation resistance, good mechanical properties, low smoke and low toxicity when burned, and is widely used in adhesives, plastics and flame retardant materials. In addition, phenolic resin has good heat resistance, chemical resistance and mechanical strength, which can effectively protect the active substances inside the capsule from being affected by the external environment. It also has good solubility and processability, which facilitates the preparation of microcapsules. Therefore, phenolic resin is used as the wall material and hollow nickel silicate as the core material. During the flame retardant process, the phenolic resin first plays a flame retardant role, and then the nickel silicate is slowly released through the gaps in the wall material to provide flame retardancy, achieving a long-term flame retardant effect.

[0009] Acrylate resin is a high-molecular-weight polymer with excellent heat resistance, chemical resistance, and mechanical properties. It is widely used in adhesive bonding and encapsulation applications in high-temperature environments. The composite of hollow nickel silicate microcapsules and acrylate resin allows for excellent adhesion of the flame retardant treatment layer to the aluminum foil layer and the corrosion-resistant treatment layer. This flame retardant mechanism and effect effectively enhances the long-term flame retardancy of aluminum-plastic film.

[0010] Preferably, the hollow nickel silicate microcapsules and acrylate resin composite layer are prepared by the following steps:

[0011] S1. Dissolve 3-5 g of nickel chloride and 2-6 g of silicate in 150-250 mL of water, then add 0.2-1 g of sodium hydroxide and 1-5 g of hexadecyltrimethylammonium bromide to the solution, stir for 10-50 min, centrifuge, wash with water, dry, and then react at 200-300 ° C for 2-3 h to obtain hollow nickel silicate;

[0012] S2, dissolving the hollow nickel silicate obtained in S1 in 10-50 mL of acetone, then adding 50-90 g of phenolic resin, stirring at 1000-300 rad / min, and spray drying to obtain hollow nickel silicate microcapsules;

[0013] S3. Mix the hollow nickel silicate microcapsules obtained in S2 with 60-90g of acrylate resin and heat to 120-180°C. Add 20-40g of acid anhydride amine and 5-15g of accelerator, mix and cure, apply on a release film, and dry.

[0014] By adopting the above technical solution, 3-5g nickel chloride and 2-6g silicate are stirred and dissolved in 150-250mL water to obtain a nickel silicate precursor solution; then 0.2-1g sodium hydroxide and 1-5g hexadecyltrimethylammonium bromide (CTAB) are added to the solution. CTAB, as a template, can form colloidal particles in the solution. In the mixed solution, the nickel silicate ions in the nickel silicate precursor solution gradually react with hydroxide ions to form a nickel silicate precipitate. The template will be wrapped inside the nickel silicate precipitate. After stirring for 10-50min, centrifugation and washing with water and drying are carried out to remove the residual template and ions. Then, the reaction is carried out at 200-300℃ for 2-3h, and the dried nickel silicate precipitate is calcined to form a stable hollow structure, and the template is removed to obtain hollow nickel silicate.

[0015] The obtained hollow nickel silicate is dissolved in 10-50 mL of acetone, and then phenolic resin is added. After stirring at 1000-300 rad / min, the mixture is spray-dried to obtain hollow nickel silicate flame-retardant microcapsules.

[0016] Finally, the hollow nickel silicate flame retardant microcapsules are mixed with the acrylate resin and heated to 120-180° C., 20-40 g of anhydride amine and 5-15 g of accelerator are added to promote the crosslinking density, and then coated on a release film and dried to obtain a composite layer of the hollow nickel silicate microcapsules and acrylate resin.

[0017] Preferably, the accelerator is a composite of isocyanate and polyamide.

[0018] By adopting the above technical solution, the isocyanate and polyamide complex reacts with the phenolic groups in the phenolic resin of the hollow nickel silicate flame-retardant microcapsule wall material, accelerating the curing reaction and increasing the crosslink density with the phenolic resin, thereby improving the strength, hardness, and heat resistance of the cured material. The isocyanate, polyamide, and acrylic resin react through their functional groups with those in the acrylic resin, achieving a chemical bond between the two substances. This enhances the adhesion and heat resistance of the complex, improves the bonding effect of the hollow nickel silicate microcapsule and acrylic resin composite layer, and further improves the long-term flame retardancy of the flame retardant treatment layer.

[0019] Preferably, the mass ratio of the isocyanate to the polyamide is 1:(3-4).

[0020] By adopting the above technical solution and adjusting the mass ratio of isocyanate and polyamide, the composite effect of the hollow nickel silicate microcapsules and the acrylic resin composite layer can be further improved, thereby improving the long-term flame retardant performance of the flame retardant treatment agent layer.

[0021] Preferably, the thickness of the flame retardant treatment agent layer is 5-10 μm.

[0022] By adopting the above technical solution, a thicker flame retardant layer can provide more flame retardant substances, forming a more stable carbonized layer that isolates heat sources and oxygen. However, a thicker flame retardant layer may affect the flexibility and plasticity of the aluminum-plastic film. A thicker flame retardant layer may increase the hardness and brittleness of the aluminum-plastic film, reduce its bendability and stretchability, and easily cause peeling or shedding. Therefore, the thickness of the flame retardant layer is adjusted to 5-10μm to achieve long-term flame retardancy of the aluminum-plastic film.

[0023] Preferably, the material of the protective layer is nylon, and the thickness is 15-30 μm.

[0024] By adopting the above technical solution, nylon has a higher melting point, which makes nylon have better fire resistance at high temperatures; and because the nylon molecular chain contains amide groups, when encountering a fire source, the amide groups will decompose to produce nitrogen, forming an inert gas layer, thereby hindering the further supply of oxygen and suppressing the spread of flames, making it have better self-extinguishing properties, that is, it can extinguish itself after the fire source disappears.

[0025] Preferably, the outer adhesive layer and the inner adhesive layer are made of polyacrylate with a thickness of 1-5 μm.

[0026] By adopting the above technical solution, polyacrylate can be used as an adhesive to firmly bond the aluminum foil and other layers of film together, provide good bonding performance, form the structure of the aluminum-plastic film, and at the same time adjust the thickness to 1-5μm, so that the aluminum-plastic film has higher strength and durability.

[0027] Preferably, the heat sealing layer material is cast polypropylene (CPP) with a thickness of 20-60 μm.

[0028] By adopting the above technical solution, using cast polypropylene CPP as the heat sealing layer material and adjusting the thickness to 20-60 μm, good heat sealing performance and bonding performance can be provided, so that the aluminum-plastic film has higher strength and durability.

[0029] Preferably, the corrosion-resistant treatment layer is a fluorine film layer with a thickness of 5-15 μm.

[0030] By adopting this technical solution, the fluorine film layer exhibits excellent corrosion resistance, effectively preventing the erosion of the aluminum-plastic film by external corrosive substances. The fluorine film layer has a low surface energy, resulting in excellent anti-adhesion properties. The fluorine film layer also has high hardness and wear resistance, and its thickness can be adjusted to 5-15μm, effectively resisting external friction and scratches.

[0031] In a second aspect, the present application provides a use of any of the above-mentioned aluminum-plastic films in a lithium-ion battery.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] (1) By adjusting the type and thickness of the raw materials of each layer of the aluminum-plastic film, the flame retardant grade and LOI of the obtained aluminum-plastic film are V0 and 42.6% respectively, which has high flame retardant performance and long-term flame retardancy.

[0034] (2) The present application adds a flame retardant treatment agent layer between the corrosion-resistant treatment layer and the aluminum foil layer of the aluminum-plastic film; and adjusts the flame retardant treatment agent layer to a composite layer of hollow nickel silicate microcapsules and acrylate resin, uses phenolic resin as the wall material, and hollow nickel silicate as the core material of the microcapsules, so that the flame retardant properties of the hollow nickel silicate are slowly released, and adjusts the thickness of the composite layer of hollow nickel silicate microcapsules and acrylate resin, thereby improving the long-term flame retardancy of the aluminum-plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the aluminum-plastic film diagram provided by this application.

[0036] The figures are marked as follows: 1-protective layer, 2-outer adhesive layer, 3-corrosion-resistant treatment layer, 4-flame retardant treatment agent layer, 5-aluminum foil layer, 6-flame retardant treatment agent layer, 7-corrosion-resistant treatment layer, 8-inner adhesive layer and 9-heat sealing layer. DETAILED DESCRIPTION

[0037] The present application is further described in detail below with reference to specific embodiments.

[0038] The following raw materials in this application are all commercially available products. They are provided to fully disclose the raw materials in this application and should not be construed as limiting the sources of the raw materials. Specifically:

[0039] Nickel chloride, content 99%; sodium silicate, content 99%; sodium hydroxide, content 99%; cetyltrimethylammonium bromide, content 98%; acetone, content 99%; phenolic resin, content 99%, density 63g / cm 3The anhydride amine is 3-aminophthalic anhydride, with a content of 99%; polyamide, with a content of 99%; isocyanate, with a content of 99%; polyacrylate, with a content of 99%; cast polypropylene CPP, with a density / specific gravity of 0.900g / cm 3 , tensile strength (yield) 29.4MPa, flexural modulus 1370MPa, cantilever notched impact strength 88J / m, heat deformation temperature under load 110℃; polyvinylidene fluoride, 1.78g / cm 3 , acrylate resin, content 99%, industrial grade.

[0040] Preparation Examples of Raw Materials and / or Intermediates The following is an example of the preparation of hollow nickel silicate microcapsules and acrylate resin composite layers.

[0041] Preparation Example 1

[0042] The hollow nickel silicate microcapsules and acrylate resin composite layer of Preparation Example 1 was prepared by the following steps:

[0043] S1. 4 g of nickel chloride and 4 g of sodium silicate were stirred and dissolved in 200 mL of water, and then 0.5 g of sodium hydroxide and 3 g of hexadecyltrimethylammonium bromide were added to the solution. After stirring for 30 min, the mixture was centrifuged and washed three times with water, dried in a vacuum drying oven at 80 ° C for 2 h, and then reacted at 250 ° C for 2.5 h to obtain hollow nickel silicate;

[0044] S2, dissolving the hollow nickel silicate obtained in S1 in 30 mL of acetone, then adding 70 g of phenolic resin, stirring at 2000 rad / min, spray drying, adjusting the spray dryer pressure to 12 MPa, controlling the inlet air temperature to 120° C., and the outlet air temperature to 90° C., and cooling to obtain hollow nickel silicate flame retardant microcapsules;

[0045] S3. Mix the hollow nickel silicate flame retardant microcapsules obtained in S2 with 75 g of acrylic resin and stir evenly, heat to 150°C, stir and react for 4 hours, then add 30 g of acid anhydride amine and 10 g of polyamide (accelerator), stir evenly and cure for 4 hours, apply on a release film, and vacuum dry for 12 hours to obtain a composite layer of hollow nickel silicate microcapsules and acrylic resin.

[0046] Preparation Example 2

[0047] The preparation method of the hollow nickel silicate microcapsules and the acrylate resin composite layer of Preparation Example 2 is the same as that of Preparation Example 1, except that the raw material dosages are different, as shown in Table 1 for details.

[0048] Preparation Example 3-7

[0049] The preparation methods of the hollow nickel silicate microcapsules and acrylate resin composite layers of Preparation Examples 3-7 are the same as those of Preparation Example 1, except that the raw material dosages are different, as shown in Table 1 for details.

[0050] Table 1 Raw materials for the hollow nickel silicate microcapsules and acrylate resin composite layers of Preparation Examples 2-7

[0051]

[0052]

[0053] Example

[0054] Example 1

[0055] The aluminum-plastic film of Example 1 is sequentially provided with a protective layer, i.e., a nylon layer, with a thickness of 23 μm; an outer adhesive layer, i.e., a polyacrylate, with a thickness of 3 μm; a corrosion-resistant treatment layer, i.e., a fluorine film (polyvinylidene fluoride) layer, with a thickness of 10 μm; a flame retardant treatment agent layer, i.e., a composite layer of hollow nickel silicate microcapsules and acrylic resin, with a thickness of 3 μm; an aluminum foil layer, with a thickness of 25 μm; a flame retardant treatment agent layer, i.e., a composite layer of hollow nickel silicate microcapsules and acrylic resin, with a thickness of 3 μm; a corrosion-resistant treatment layer, i.e., a fluorine film (polyvinylidene fluoride) layer, with a thickness of 10 μm; an inner adhesive layer, i.e., a polyacrylate, with a thickness of 3 μm; and a heat-sealing layer, i.e., a cast polypropylene (CPP), with a thickness of 40 μm.

[0056] The hollow nickel silicate microcapsules and acrylate resin composite layer is the composite layer of hollow nickel silicate microcapsules and acrylate resin prepared in Preparation Example 1.

[0057] Examples 2-7

[0058] The aluminum-plastic film of Example 2-7 is the same as that of Example 1, except that the composite layer of hollow nickel silicate microcapsules and acrylate resin is made from the composite layer of hollow nickel silicate microcapsules and acrylate resin prepared in Preparation Example 2-7.

[0059] Example 8

[0060] The aluminum-plastic film of Example 8 is the same as that of Example 5, except that the thickness of the flame retardant treatment agent layer is 5 μm.

[0061] Example 9

[0062] The aluminum-plastic film of Example 9 is the same as that of Example 5, except that the thickness of the flame retardant treatment agent layer is 8 μm.

[0063] Example 10

[0064] The aluminum-plastic film of Example 10 is the same as that of Example 5, except that the thickness of the flame retardant treatment agent layer is 10 μm.

[0065] Example 11

[0066] The aluminum-plastic film of Example 11 is the same as that of Example 5, except that the thickness of the flame retardant treatment agent layer is 12 μm.

[0067] Comparative Example

[0068] Comparative Example 1

[0069] The aluminum-plastic film of Comparative Example 1 is the same as that of Example 1, except that no flame retardant treatment agent layer is included between the corrosion-resistant treatment layer and the aluminum foil layer.

[0070] Comparative Example 2

[0071] The aluminum-plastic film of Comparative Example 2 is the same as that of Example 1, except that the flame retardant treatment agent layer is replaced by a phenolic resin layer of equal thickness, and the flame retardant treatment agent layer is a phenolic resin layer with a thickness of 3 μm.

[0072] The following is the application of aluminum plastic film in lithium ion batteries

[0073] Application Example 1

[0074] The application of aluminum-plastic film in lithium-ion batteries includes the following steps:

[0075] The protective layer, outer adhesive layer, corrosion-resistant treatment layer, flame retardant treatment agent layer, aluminum foil layer, flame retardant treatment agent layer, corrosion-resistant treatment layer, inner adhesive layer and heat sealing layer of the aluminum-plastic film obtained in Example 1 were bonded in sequence from the outside to the inside and then pressed to obtain a soft-pack battery packaging material.

[0076] Application Example 2-11

[0077] The application of Application Example 2-11 in lithium-ion batteries is the same as that of Application Example 1, except that the aluminum-plastic film is the aluminum-plastic composite film obtained in Example 2-11, and the remaining operations are the same as those of Application Example 1.

[0078] Application Comparative Example 1-2

[0079] The application of Comparative Example 1-2 in lithium ion batteries is the same as that of Application Example 1, except that the aluminum-plastic film is the aluminum-plastic composite film obtained in Comparative Example 1-2, and the rest of the operations are the same as those of Application Example 1.

[0080] Performance testing

[0081] The performance of the aluminum-plastic films of different application examples 1-11 and application comparison examples 1-2 was tested using UL-94. The test results are shown in Table 2.

[0082] Table 2 Performance test results of different aluminum-plastic films

[0083]

[0084]

[0085] The test results in Table 4 show that the flame retardant grade and LOI (Limiting Oxygen Index, which refers to the minimum oxygen concentration required for the fiber to burn in contact with flame in air) of the aluminum-plastic film obtained in this application are V0 and 42.6% respectively, which shows high flame retardancy and long-term flame retardancy.

[0086] The flame retardant grade of the aluminum-plastic films obtained in Application Examples 1-7 is V0. The limiting oxygen index of the aluminum-plastic film obtained in Application Example 3 is 36.0%, which is higher than that of Application Examples 1-2, indicating that when the accelerator for the modified phenolic resin is an isocyanate and polyamide complex in the preparation of the composite layer of hollow nickel silicate microcapsules and acrylate resin, it is more suitable; the limiting oxygen index of the aluminum-plastic films obtained in Application Examples 4-6 is 38.1-40.2%, which is higher than that of Application Examples 3 and 7, indicating that it is more suitable to adjust the mass ratio of isocyanate and polyamide to 1:(3-4), which improves the long-term flame retardancy of the aluminum-plastic film. This may be related to the fact that adjusting the accelerator to an isocyanate and polyamide complex and controlling their mass ratio can improve the composite effect of the hollow nickel silicate microcapsules and acrylate resin.

[0087] The flame retardant grade of the aluminum-plastic film obtained in Application Examples 5 and 8-11 is V0, and the limiting oxygen index of the aluminum-plastic film obtained in Application Examples 8-10 is 41.3-42.6%, which is higher than that of Application Examples 5 and 11, indicating that when the thickness of the flame retardant treatment agent layer is 5-10 μm, it is more appropriate, which improves the long-term flame retardancy of the aluminum-plastic film. This may be related to the fact that when the thickness of the flame retardant treatment agent layer is adjusted to any value of 5-10 μm, the long-term flame retardancy of the flame retardant treatment agent layer can be improved.

[0088] In addition, based on the various index data of the aluminum-plastic film of Comparative Examples 1-2 and Application Example 1, it was found that the flame retardant treatment agent layer of the aluminum-plastic film of the present application was adjusted to a composite layer of hollow nickel silicate microcapsules and acrylate resin, which can improve the long-term flame retardancy of the aluminum-plastic film to varying degrees.

[0089] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An aluminum-plastic film, characterized in that: The invention comprises a protective layer, an outer adhesive layer, a corrosion-resistant treatment layer, an aluminum foil layer, a corrosion-resistant treatment layer, an inner adhesive layer and a heat-sealing layer, which are arranged in sequence from the outside to the inside; A flame retardant treatment agent layer is also included between the corrosion-resistant treatment layer and the aluminum foil layer; The flame retardant treatment agent layer is a composite layer of hollow nickel silicate microcapsules and acrylic resin; The hollow nickel silicate microcapsules and acrylate resin composite layer are prepared by the following steps: S1. 3-5 g of nickel chloride and 2-6 g of silicate are stirred and dissolved in 150-250 mL of water, and then 0.2-1 g of sodium hydroxide and 1-5 g of hexadecyltrimethylammonium bromide are added to the solution. After stirring for 10-50 min, the mixture is centrifuged and washed with water, dried, and then reacted at 200-300 ° C for 2-3 h to obtain hollow nickel silicate; S2, dissolving the hollow nickel silicate obtained in S1 in 10-50 mL of acetone, then adding 50-90 g of phenolic resin, stirring at 1000-3000 rad / min, and spray drying to obtain hollow nickel silicate microcapsules; S3. Mix the hollow nickel silicate microcapsules obtained in S2 with 60-90g of acrylate resin and heat to 120-180°C. Add 20-40g of acid anhydride amine and 5-15g of accelerator, mix and cure, apply on a release film, and dry.

2. The aluminum-plastic film according to claim 1, characterized in that The accelerator is a compound of isocyanate and polyamide.

3. The aluminum-plastic film according to claim 2, characterized in that The mass ratio of the isocyanate to the polyamide is 1:(3-4).

4. The aluminum-plastic film according to claim 1, characterized in that The thickness of the flame retardant treatment agent layer is 5-10 μm.

5. The aluminum-plastic film according to claim 1, characterized in that The material of the protective layer is nylon, and the thickness is 15-30 μm.

6. The aluminum-plastic film according to claim 1, characterized in that The outer adhesive layer and the inner adhesive layer are made of polyacrylate and have a thickness of 1-5 μm.

7. The aluminum-plastic film according to claim 1, characterized in that The heat sealing layer material is cast polypropylene (CPP) with a thickness of 20-60 μm.

8. The aluminum-plastic film according to claim 1, characterized in that The corrosion-resistant treatment layer is a fluorine film layer with a thickness of 5-15 μm.

9. Use of the aluminum-plastic film according to any one of claims 1 to 8 in lithium-ion batteries.

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