Aluminum foil containing nickel-phosphorus coating, preparation process of aluminum foil and composite packaging film

Abstract

The invention relates to the technical field of outer packaging materials for soft package batteries, and particularly discloses an aluminum foil containing a nickel-phosphorus coating, a preparation process of the aluminum foil and a composite packaging film. The invention discloses a preparation process of an aluminum foil containing a nickel-phosphorus coating. The preparation process comprises the following steps: 1, pretreating the aluminum foil; 2, the aluminum foil is immersed in a chemical nickel-phosphorus plating solution, and the aluminum foil containing a nickel-phosphorus plating layer is obtained; the chemical nickel-phosphorus plating solution contains nickel sulfate, sodium hypophosphite, lactic acid, glycine and copper sulfate, and the pH value of the chemical nickel-phosphorus plating solution is adjusted to 6.0-6.5. The nickel-phosphorus coating is introduced to the surface of the aluminum foil, so that the corrosion resistance, barrier property and chemical stability of the aluminum foil are remarkably improved, and the aluminum foil containing the nickel-phosphorus coating is introduced into the outer packaging material of the soft package battery, so that the electrolyte stripping resistance of the outer packaging material can be effectively enhanced; therefore, the corrosion of various chemical components in the electrolyte can be better resisted, and the safety and the stability of the battery in a long-term working process are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of outer packaging materials for soft-pack batteries, and in particular to an aluminum foil containing a nickel-phosphorus coating, a preparation process thereof, and a composite packaging film. Background Art

[0002] In the rapidly developing new energy industry, soft-pack batteries have gradually become an important power source in electric vehicles, energy storage systems, portable electronic devices and other fields due to their high energy density, good safety and design flexibility. However, the safety and long-term stability of soft-pack batteries largely depend on the performance of their outer packaging materials. With the widespread application of soft-pack batteries in the new energy field, the performance requirements of their outer packaging materials are also increasing.

[0003] Although traditional soft-pack battery outer packaging materials have certain corrosion resistance and barrier properties, their electrolyte peeling resistance often decreases significantly in the complex and changeable battery working environment, especially after long-term contact with the electrolyte. Specifically, the chemical components in the electrolyte, such as organic solvents, lithium salts, etc., have an erosive effect on packaging materials that cannot be ignored. Under long-term immersion, the molecular chain structure of traditional materials may be destroyed, resulting in a sharp drop in peeling resistance, which in turn causes safety problems such as electrolyte leakage and internal short circuit, seriously affecting the service life and overall performance of the battery. Therefore, the development of an outer packaging material with better electrolyte peeling resistance has become an urgent need in the industry. Summary of the invention

[0004] In order to further enhance the electrolyte peeling resistance of the outer packaging material, the present invention provides an aluminum foil containing a nickel-phosphorus coating, a preparation process thereof, and a composite packaging film. The present application significantly improves the corrosion resistance, barrier properties, and chemical stability of the aluminum foil by introducing a nickel-phosphorus coating on the surface of the aluminum foil. The present application uses an aluminum foil containing a nickel-phosphorus coating as the outer packaging material of a soft-pack battery, which can effectively enhance the electrolyte peeling resistance of the outer packaging material, thereby better resisting the erosion of various chemical components in the electrolyte and ensuring the safety and stability of the battery during long-term operation.

[0005] In the first aspect, the present application provides a process for preparing an aluminum foil containing a nickel-phosphorus coating using the following technical solution: A process for preparing an aluminum foil containing a nickel-phosphorus coating comprises the following steps: Step 1: pre-treating the aluminum foil, including sensitization, water washing, activation, water washing and drying treatments in sequence; Step 2: immersing the pretreated aluminum foil in a chemical nickel-phosphorus plating solution, and performing chemical double-sided plating at 60-65° C. to obtain an aluminum foil containing a nickel-phosphorus plating layer; The chemical nickel-phosphorus plating solution has the following components: 20-25 g / L nickel sulfate, 20-35 g / L sodium hypophosphite, 20-25 g / L lactic acid, 10-15 g / L glycine, and 0.05-0.1 g / L copper sulfate; The pH value of the chemical nickel-phosphorus plating solution is adjusted to 6.0-6.5.

[0006] In the above technical solution, the present application prepares an aluminum foil containing a nickel-phosphorus coating with good corrosion resistance and barrier properties through a specific chemical nickel-phosphorus plating solution and a specific chemical plating process. Specifically, the present application uses nickel sulfate and sodium hypophosphite as the main ingredients of the plating solution, and lactic acid and glycine as complexing agents to effectively stabilize the metal ions in the plating solution and promote the uniform deposition of the nickel-phosphorus alloy. At the same time, the trace amount of copper sulfate added not only plays a catalytic role, but also contains Cu 2+ It will also precipitate and adsorb on the surface of aluminum foil first, increasing the nucleation core of subsequent Ni deposition, making the nodules of the coating smaller. 2+ It will inhibit the deposition of Ni and prevent Ni from precipitating too quickly, making the coating more uniform, thereby further improving the corrosion resistance of the coating. In addition, controlling the pH value of the plating solution within the range of 6.0-6.5 and the temperature within the range of 60-65°C further ensures the stability and consistency of the coating quality.

[0007] Preferably, the chemical nickel-phosphorus plating solution further comprises the following components: 0.001-0.005 g / L octylphenol polyoxyethylene ether and 0.005-0.01 g / L hexadecyltrimethylammonium chloride.

[0008] In the above technical scheme, the present application further introduces octylphenol polyoxyethylene ether and hexadecyl trimethyl ammonium chloride as surfactants on the basis of the composition of the chemical nickel-phosphorus plating solution. Octylphenol polyoxyethylene ether and hexadecyl trimethyl ammonium chloride cooperate with each other to help reduce the tension of the plating solution on the surface of the aluminum foil, and interact with the ions in the plating solution, so that the plating solution can cover the surface of the aluminum foil more evenly, and promote the stability and uniformity of the plating solution, thereby further improving the uniformity of the coating, thereby forming a more dense and uniform nickel-phosphorus coating, and effectively improving the bonding strength between the nickel-phosphorus coating and the aluminum foil, and further improving the corrosion resistance and barrier properties of the aluminum foil containing the nickel-phosphorus coating.

[0009] Preferably, the sensitization in step 1 refers to immersing the aluminum foil in a sensitizing solution for 6-8 minutes, and the components of the sensitizing solution are as follows: 6-8 mL / L 16 wt% hydrochloric acid solution, 20-25 g / L nickel sulfate, and 10-15 g / L sodium hypophosphite.

[0010] In the above technical solution, the present application uses a sensitizing solution with a specific ratio to pre-treat the aluminum foil, which can well enhance the activity of the aluminum foil surface and provide a good adhesion basis for the subsequent chemical nickel-phosphorus plating process. At the same time, the use of nickel sulfate can make the subsequently formed coating more dense, further improving the corrosion resistance and barrier properties of the aluminum foil containing the nickel-phosphorus coating.

[0011] Preferably, the activation in step 1 refers to immersing the aluminum foil in an activation solution for 8-10 minutes, and the components of the activation solution are as follows: 10-12 mL / L 16 wt% hydrochloric acid solution, 0.2-0.4 g / L palladium chloride.

[0012] In the above technical solution, the present application uses palladium chloride as an activator, which can effectively improve the bonding force between the nickel-phosphorus coating and the aluminum foil substrate, thereby ensuring that the coating can be evenly and densely attached to the surface of the aluminum foil.

[0013] Preferably, the drying in step 1 refers to drying the aluminum foil at 100° C. for 1-2 min.

[0014] In the above technical solution, the present application further consolidates the pretreatment effect of the aluminum foil surface through drying treatment, removes excess moisture and residues, and provides better construction conditions for the subsequent chemical nickel-phosphorus plating process. In the second aspect, the present application provides an aluminum foil containing a nickel-phosphorus coating using the following technical solution: An aluminum foil containing a nickel-phosphorus coating is prepared by using the preparation process of the aluminum foil containing a nickel-phosphorus coating as described in the first aspect.

[0015] In the above technical solution, the present application successfully deposited a nickel-phosphorus coating evenly on both sides of the aluminum foil through a specific preparation process. Such a nickel-phosphorus coating not only significantly improves the corrosion resistance of the aluminum foil, but also enhances the barrier properties of the aluminum foil, giving the aluminum foil higher chemical stability, and providing a more reliable material choice for the outer packaging of soft-pack batteries.

[0016] Preferably, the thickness of the aluminum foil is 35-55 μm, and the thickness of the nickel-phosphorus coating is 5-10 μm.

[0017] In the above technical solution, the present application further optimizes the performance of aluminum foil containing nickel-phosphorus coating by controlling the thickness of aluminum foil and nickel-phosphorus coating. Specifically, the thickness of aluminum foil is selected in the range of 35-55μm, which not only ensures the strength and toughness of aluminum foil, but also facilitates subsequent processing and molding. The thickness of the nickel-phosphorus coating is controlled between 5-10μm. This thickness range can effectively resist the erosion of electrolyte, better improve the corrosion resistance and barrier properties of aluminum foil, and control the construction cost within a reasonable range.

[0018] In a third aspect, the present application provides a composite packaging film adopting the following technical solution: A composite packaging film comprises the aluminum foil containing nickel-phosphorus coating as described in the second aspect.

[0019] In the above technical scheme, the present application introduces aluminum foil containing nickel-phosphorus coating into the composite packaging film. The good corrosion resistance and barrier properties exhibited by the aluminum foil containing nickel-phosphorus coating not only significantly enhance the electrolyte peeling resistance of the composite packaging film, but also improve the overall structural strength and thermal stability.

[0020] Preferably, the composite packaging film has a five-layer structure, which includes, from outside to inside, an outer layer, a first adhesive layer, an aluminum foil containing a nickel-phosphorus coating, a second adhesive layer and an inner layer.

[0021] Preferably, the outer layer is a nylon film, and the inner layer is a polypropylene film.

[0022] Preferably, the outer layer has a thickness of 15-30 μm.

[0023] Preferably, the inner layer has a thickness of 25-80 μm.

[0024] Preferably, the adhesive amount of the first adhesive layer and the second adhesive layer is: 2-6g / m 2 .

[0025] Preferably, the main component of the first adhesive layer is polyurethane.

[0026] Preferably, the second adhesive layer is mainly composed of maleic acid modified polypropylene.

[0027] In the above technical scheme, the present application designs a composite packaging film with a multi-layer structure based on the aluminum foil containing nickel-phosphorus coating. The composite packaging film of the present application uses the aluminum foil containing nickel-phosphorus coating as the core layer, and is tightly combined with the outer nylon film and the inner polypropylene film through an adhesive layer. Such a composite packaging film realizes the synergistic complementarity of each layer structure. The outer nylon film has good wear resistance and puncture resistance, the inner polypropylene film has good heat sealing and barrier properties, and the aluminum foil containing nickel-phosphorus coating has good corrosion resistance and barrier properties. The various layer structures together provide all-round protection for the soft-pack battery.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The aluminum foil containing nickel-phosphorus coating of the present application has good corrosion resistance and barrier properties, can effectively resist the erosion of electrolyte, and protect the battery from damage. This coating not only enhances the corrosion resistance of the aluminum foil, but also significantly improves its barrier properties, providing a more reliable and durable protective barrier for soft-pack batteries. In the actual use of the battery, the aluminum foil containing nickel-phosphorus coating can significantly extend the service life of the battery and reduce performance degradation and safety hazards caused by electrolyte penetration.

[0029] 2. The present application achieves uniform deposition of the nickel-phosphorus coating by optimizing the composition of the chemical nickel-phosphorus plating solution, by using lactic acid and glycine as chelating agents at the same time, and by adding copper sulfate, thereby avoiding the problems of nodulation and excessive thickness of the coating and further improving the quality of the coating.

[0030] 3. The present application further optimizes the composition of the chemical nickel-phosphorus plating solution and introduces octylphenol polyoxyethylene ether and cetyltrimethylammonium chloride, which not only improves the surface tension of the plating solution, but also promotes the stability and uniformity of the plating solution, making the coating more dense and uniform, thereby improving the bonding strength between the coating and the aluminum foil.

[0031] 4. The composite packaging film provided in the present application uses aluminum foil containing nickel-phosphorus plating as the core layer, which gives full play to its excellent corrosion resistance and barrier properties. Through the design of the multi-layer structure, the wear resistance and puncture resistance of the outer nylon film, and the heat sealing and barrier properties of the inner polypropylene film, each layer of material can work synergistically to jointly improve the overall performance of the packaging film. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the layer structure of a composite packaging film. DETAILED DESCRIPTION

[0033] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0034] Example 1 A process for preparing an aluminum foil containing a nickel-phosphorus coating comprises the following steps: Step 1: Pre-treat the aluminum foil, including sensitization, water washing, activation, water washing and drying treatments in sequence.

[0035] Sensitization: Soak the aluminum foil in the sensitization solution at 22°C for 7 minutes.

[0036] The sensitizing solution components are as follows: 7 mL / L 16 wt% hydrochloric acid solution, 24 g / L nickel sulfate (NiSO 4 7H 2 O), 14g / L sodium hypophosphite (NaH 2 PO 2 ).

[0037] Washing: Wash with deionized water.

[0038] Activation: Soak the aluminum foil in the activation solution at 24°C for 9 minutes.

[0039] The activation solution components are as follows: 11 mL / L 16 wt% hydrochloric acid solution, 0.3 g / L palladium chloride (PdCl 2 ).

[0040] Washing: Wash with deionized water.

[0041] Drying: Dry the aluminum foil at 100°C for 1 min.

[0042] Step 2: Immerse the pretreated aluminum foil in a chemical nickel-phosphorus plating solution, and perform chemical double-sided plating at 62° C. to obtain an aluminum foil containing a nickel-phosphorus coating.

[0043] The chemical nickel-phosphorus plating solution composition is as follows: 23 g / L nickel sulfate (NiSO 4 7H 2 O), 30g / L sodium hypophosphite (NaH 2 PO 2 )、22g / L lactic acid (C 3 H 6 O 3 )、12g / L glycine (C 2 H 5 NO 2 )、0.08g / L copper sulfate (CuSO 4 ), and the pH was adjusted to 6.2.

[0044] Example 2 A preparation process of an aluminum foil containing a nickel-phosphorus coating, which differs from that of Example 1 in that it comprises the following steps: Step 1: Pre-treat the aluminum foil, including sensitization, water washing, activation, water washing and drying treatments in sequence.

[0045] Sensitization: Soak the aluminum foil in the sensitization solution at 20°C for 8 minutes.

[0046] The sensitizing solution components are as follows: 8 mL / L 16 wt% hydrochloric acid solution, 20 g / L nickel sulfate (NiSO 4 7H 2 O), 15g / L sodium hypophosphite (NaH 2 PO 2 ).

[0047] Washing: Wash with deionized water.

[0048] Activation: Soak the aluminum foil in the activation solution at 20°C for 10 min.

[0049] The activation solution components are as follows: 10 mL / L 16 wt% hydrochloric acid solution, 0.4 g / L palladium chloride (PdCl 2 ).

[0050] Washing: Wash with deionized water.

[0051] Drying: Dry the aluminum foil at 100°C for 1 min.

[0052] Step 2: Immerse the pretreated aluminum foil in a chemical nickel-phosphorus plating solution, and perform chemical double-sided plating at 60° C. to obtain an aluminum foil containing a nickel-phosphorus coating.

[0053] The chemical nickel-phosphorus plating solution composition is as follows: 20 g / L nickel sulfate (NiSO 4 7H 2 O), 20g / L sodium hypophosphite (NaH 2 PO 2 )、25g / L lactic acid (C 3 H 6 O 3 )、15g / L glycine (C 2 H 5 NO 2 )、0.05g / L copper sulfate (CuSO 4 ), and the pH was adjusted to 6.5.

[0054] Example 3 A preparation process of an aluminum foil containing a nickel-phosphorus coating, which differs from that of Example 1 in that it comprises the following steps: Step 1: Pre-treat the aluminum foil, including sensitization, water washing, activation, water washing and drying treatments in sequence.

[0055] Sensitization: Soak the aluminum foil in the sensitization solution at 25°C for 6 minutes.

[0056] The sensitizing solution components are as follows: 6 mL / L 16 wt% hydrochloric acid solution, 25 g / L nickel sulfate (NiSO 4 7H 2 O), 10g / L sodium hypophosphite (NaH 2 PO 2 ).

[0057] Washing: Wash with deionized water.

[0058] Activation: Soak the aluminum foil in the activation solution at 25°C for 8 minutes.

[0059] The activation solution components are as follows: 12 mL / L 16 wt% hydrochloric acid solution, 0.2 g / L palladium chloride (PdCl 2 ).

[0060] Washing: Wash with deionized water.

[0061] Drying: Dry the aluminum foil at 100°C for 1 min.

[0062] Step 2: Immerse the pretreated aluminum foil in a chemical nickel-phosphorus plating solution, and perform chemical double-sided plating at 65° C. to obtain an aluminum foil containing a nickel-phosphorus coating.

[0063] The chemical nickel-phosphorus plating solution composition is as follows: 25 g / L nickel sulfate (NiSO 4 7H 2 O), 35g / L sodium hypophosphite (NaH 2 PO 2 )、20g / L lactic acid (C 3 H 6 O 3 )、10g / L glycine (C 2 H 5 NO 2 )、0.1g / L copper sulfate (CuSO 4 ), and the pH value was adjusted to 6.0.

[0064] Example 4 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 1 in that the chemical nickel-phosphorus plating solution further contains 0.001 g / L octylphenol polyoxyethylene ether and 0.005 g / L hexadecyltrimethylammonium chloride.

[0065] Example 5 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 1 in that the chemical nickel-phosphorus plating solution further contains 0.002 g / L octylphenol polyoxyethylene ether and 0.008 g / L hexadecyltrimethylammonium chloride.

[0066] Example 6 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 1 in that the chemical nickel-phosphorus plating solution further contains 0.005 g / L octylphenol polyoxyethylene ether and 0.01 g / L hexadecyltrimethylammonium chloride.

[0067] Example 7 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 4 in that an equal amount of hexadecyltrimethylammonium chloride is replaced with octylphenol polyoxyethylene ether.

[0068] Example 8 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 4 in that an equal amount of octylphenol polyoxyethylene ether is replaced by hexadecyltrimethylammonium chloride.

[0069] Example 9 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 4 in that an equal amount of hexadecyltrimethylammonium chloride is replaced by dodecyltrimethylammonium chloride.

[0070] Example 10 A preparation process of aluminum foil containing nickel-phosphorus coating, which differs from Example 4 in that octylphenol polyoxyethylene ether is replaced by polyethylene glycol PEG-200 in equal amounts.

[0071] Comparative Example 1 A process for preparing an aluminum foil containing a nickel-phosphorus coating, which differs from Example 1 in that an equal amount of copper sulfate in the chemical nickel-phosphorus plating solution is replaced by sodium gluconate.

[0072] Application Example 1 A composite packaging film, such as Figure 1 As shown, the composite packaging film is divided into a five-layer structure, which is an outer layer, a first adhesive layer, an aluminum foil containing a nickel-phosphorus coating, a second adhesive layer and an inner layer from the outside to the inside.

[0073] The outer layer is a biaxially oriented nylon film (NY) with a thickness of 15 μm.

[0074] The first adhesive layer is formed by evenly coating a layer of adhesive whose main component is polyurethane on one side of the outer layer, and the amount of adhesive is: 2g / m 2 .

[0075] Among them, the specific model of the adhesive is American Lubrizol TPU resin 5715.

[0076] The aluminum foil containing nickel-phosphorus coating is prepared by the preparation process of Example 1, the thickness of the aluminum foil is 35 μm, and the thickness of the nickel-phosphorus coating on both sides of the aluminum foil is 5 μm respectively.

[0077] The second adhesive layer is formed by evenly coating a layer of adhesive whose main component is maleic anhydride modified polypropylene on one side of the inner layer, and the amount of adhesive is: 2g / m 2 .

[0078] Among them, the specific model of the adhesive is Japan Mitsui Chemicals AT2937.

[0079] The inner layer is a cast polypropylene film (CPP) with a thickness of 50 μm.

[0080] Application Example 2 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 2.

[0081] Application Example 3 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 3.

[0082] Application Example 4 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 4.

[0083] Application Example 5 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 5.

[0084] Application Example 6 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 6.

[0085] Application Example 7 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 7.

[0086] Application Example 8 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 8.

[0087] Application Example 9 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Example 9.

[0088] Application Example 10 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing nickel-phosphorus coating is prepared by the preparation process of Example 10.

[0089] Comparative application example 1 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing the nickel-phosphorus coating is prepared by the preparation process of Comparative Example 1.

[0090] Comparative Application Example 2 A composite packaging film, which is different from Application Example 1 in that the aluminum foil containing nickel-phosphorus coating is replaced by ordinary aluminum foil.

[0091] Performance Testing According to GB / T 8808-1988 "Peeling Test Method for Soft Composite Plastic Materials", the inner layer electrolyte peeling resistance test was carried out on the composite packaging films of Example 1-10 and Comparative Application Example 1-2, and the initial peeling force of the composite packaging film, the peeling force after immersion in electrolyte for 1 week, and the peeling force after immersion in electrolyte for 4 weeks were recorded respectively. Three parallel tests were carried out for each group, and the test results are shown in Table 1.

[0092] Table 1: According to the analysis of the experimental results in Table 1, the composite packaging films of Application Examples 1-10 of the present application have good resistance to electrolyte peeling, and the peeling force can still be maintained above 15N after continuous immersion in the electrolyte for 4 weeks. It can be seen that the composite packaging films of the present application have good corrosion resistance, which is mainly due to the good corrosion resistance and barrier properties of the aluminum foil containing nickel-phosphorus coating of the present application.

[0093] Specifically combined with the analysis of Application Examples 1, 4 and 7-10, it can be seen that the components of the chemical nickel-phosphorus plating solution have a certain influence on the performance of the aluminum foil containing the nickel-phosphorus coating. When the chemical nickel-phosphorus plating solution contains both octylphenol polyoxyethylene ether and hexadecyltrimethylammonium chloride, the chemical nickel-phosphorus plating solution formula can be further optimized, so that the prepared nickel-phosphorus-coated aluminum foil can maintain a stable coating while also showing good uniformity and density, thereby significantly improving the corrosion resistance and barrier properties of the aluminum foil, and further making the peeling force of the composite packaging film in the electrolyte more excellent.

[0094] 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 modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for preparing an aluminum foil containing a nickel-phosphorus coating, characterized in that: The following steps are involved: Step 1: pre-treating the aluminum foil, including sensitization, water washing, activation, water washing and drying treatments in sequence; Step 2: immersing the pretreated aluminum foil in a chemical nickel-phosphorus plating solution, and performing chemical double-sided plating at 60-65° C. to obtain an aluminum foil containing a nickel-phosphorus plating layer; The chemical nickel-phosphorus plating solution has the following components: 20-25 g / L nickel sulfate, 20-35 g / L sodium hypophosphite, 20-25 g / L lactic acid, 10-15 g / L glycine, and 0.05-0.1 g / L copper sulfate; The pH value of the chemical nickel-phosphorus plating solution is adjusted to 6.0-6.

5.

2. The process for preparing an aluminum foil containing a nickel-phosphorus coating according to claim 1, characterized in that: The chemical nickel-phosphorus plating solution further comprises the following components: 0.001-0.005 g / L octylphenol polyoxyethylene ether and 0.005-0.01 g / L hexadecyltrimethylammonium chloride.

3. The process for preparing the aluminum foil containing nickel-phosphorus coating according to claim 1, characterized in that: The sensitization in step 1 refers to immersing the aluminum foil in a sensitizing solution for 6-8 minutes. The components of the sensitizing solution are as follows: 6-8 mL / L 16 wt% hydrochloric acid solution, 20-25 g / L nickel sulfate, and 10-15 g / L sodium hypophosphite.

4. The process for preparing an aluminum foil containing a nickel-phosphorus coating according to claim 1, characterized in that: The activation in step 1 refers to immersing the aluminum foil in an activation solution for 8-10 minutes, wherein the activation solution comprises the following components: 10-12 mL / L 16 wt% hydrochloric acid solution and 0.2-0.4 g / L palladium chloride.

5. The process for preparing an aluminum foil containing a nickel-phosphorus coating according to claim 1, characterized in that: The drying in step 1 refers to drying the aluminum foil at 100° C. for 1-2 minutes.

6. An aluminum foil containing a nickel-phosphorus coating, characterized in that: The aluminum foil is prepared by the process for preparing the aluminum foil containing nickel-phosphorus coating as described in any one of claims 1 to 5.

7. The aluminum foil containing nickel-phosphorus coating according to claim 6, characterized in that: The thickness of the aluminum foil is 35-55 μm, and the thickness of the nickel-phosphorus plating layer is 5-10 μm.

8. A composite packaging film, characterized in that: An aluminum foil comprising the nickel-phosphorus-containing coating as claimed in claim 6 or 7.

9. The composite packaging film according to claim 8, characterized in that: The composite packaging film has a five-layer structure, which includes an outer layer, a first adhesive layer, an aluminum foil containing a nickel-phosphorus coating, a second adhesive layer and an inner layer from the outside to the inside.

10. The composite packaging film according to claim 9, characterized in that: The outer layer is a nylon film, and the inner layer is a polypropylene film.

Images