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CN108493360B - Aluminum plastic film, preparation method and application thereof, and secondary battery comprising aluminum plastic film - Google Patents

Aluminum plastic film, preparation method and application thereof, and secondary battery comprising aluminum plastic film Download PDF

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Publication number
CN108493360B
CN108493360B CN201810232136.3A CN201810232136A CN108493360B CN 108493360 B CN108493360 B CN 108493360B CN 201810232136 A CN201810232136 A CN 201810232136A CN 108493360 B CN108493360 B CN 108493360B
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Prior art keywords
aluminum
plastic film
layer
dopamine solution
protective layer
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CN108493360A (en
Inventor
孙敏敏
娄忠良
范欢欢
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Soundon New Energy Technology Co Ltd
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Sander New Energy Technology Development Co ltd
Soundon New Energy Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M12/00—Hybrid cells; Manufacture thereof
    • H01M12/08—Hybrid cells; Manufacture thereof composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention provides an aluminum-plastic film, a preparation method and application thereof, and a secondary battery comprising the aluminum-plastic film, and relates to the technical field of anticorrosion packaging. The technical problem that the safety of the battery is reduced because the existing aluminum-plastic film is easily corroded by electrolyte can be solved by utilizing the aluminum-plastic film, the barrier property of the aluminum-plastic film can be effectively improved, and the purpose of improving the safety of the battery is further achieved.

Description

Aluminum plastic film, preparation method and application thereof, and secondary battery comprising aluminum plastic film
Technical Field
The invention relates to the technical field of anticorrosion packaging, in particular to an aluminum plastic film, a preparation method and application thereof and a battery comprising the aluminum plastic film.
Background
Rechargeable batteries, such as lithium ion batteries, are a new type of green chemical power source, and with the continuous updating and development of lithium battery technology, the advantages of light weight, high capacity and long service life are gradually gaining the favor of consumers. In recent years, rechargeable batteries have been widely used not only in portable electronic devices but also in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools.
Aluminum plastic film packaging (soft package battery) is an important packaging form of rechargeable storage batteries such as lithium batteries and sodium batteries. The battery is packaged by the aluminum-plastic film, so that the potential safety hazard of explosion caused by packaging the battery by using a hard steel shell or aluminum shell material is reduced, and the mass energy density of the single battery cell is improved due to the characteristic of light weight. The aluminum-plastic film mainly comprises an outer protective layer, a middle aluminum layer and an inner bonding layer. The protective layer is made of polyester or nylon with high melting point, so that the protective layer has strong mechanical property, prevents the battery from being damaged by external force and plays a role in protecting the battery. However, in practical applications, especially during the liquid injection process, the protective layer of the aluminum-plastic film is easily corroded by the electrolyte, so that the aluminum layer is exposed, the barrier property of the whole battery is reduced, the short circuit risk is easily caused, and the safety of the battery is reduced.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an aluminum-plastic film, and aims to provide a preparation method of the aluminum-plastic film, so as to solve the technical problem that the existing aluminum-plastic film is easily corroded by electrolyte, so that the safety of a battery is reduced.
The third purpose of the invention is to provide the application of the aluminum plastic film for packaging the secondary battery.
A fourth object of the present invention is to provide a secondary battery having a better corrosion prevention effect and a higher safety factor.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
an aluminum-plastic film comprises an aluminum-plastic film substrate, wherein an anti-corrosion layer which is prevented from being corroded by electrolyte is arranged on the surface of the aluminum-plastic film substrate.
Further, the plastic-aluminum membrane base member is including tie coat, aluminium lamination and the inoxidizing coating that sets gradually, the anticorrosive coating is located the top layer of inoxidizing coating.
Further, the anticorrosive layer is a polydopamine layer, a bisphenol A epoxy resin coating, an annular carbonate polyester coating or a nano titanium organic coating; preferably a polydopamine layer;
preferably, the thickness of the corrosion protection layer is 0.5 to 5 micrometers.
According to the preparation method of the aluminum-plastic film, the aluminum-plastic film is obtained by preparing a layer of anticorrosive coating on the surface of the aluminum-plastic film substrate.
Further, the surface of the aluminum-plastic film substrate is contacted with an alkaline dopamine solution, and dopamine is subjected to polymerization reaction on the surface of the aluminum-plastic film substrate to obtain the aluminum-plastic film.
Further, the dopamine solution is an aqueous dopamine solution; the concentration of the dopamine solution is 0.2-5 mg/L, and the pH value is 7.1-8.5.
Further, soaking the aluminum-plastic film substrate in a dopamine solution, stirring for 2-24 hours, then washing with deionized water to be neutral, and then drying at 50-120 ℃ for 3-12 hours to obtain the aluminum-plastic film.
Further, the pH value regulator of the dopamine solution is a tris buffer solution.
The application of the aluminum plastic film in secondary battery packaging.
A secondary battery comprises a battery cell and the aluminum-plastic film for packaging the battery cell.
Compared with the prior art, the invention has the following beneficial effects:
according to the aluminum-plastic film provided by the invention, the surface of the aluminum-plastic film substrate is provided with the anticorrosive layer, and in the liquid injection process, the anticorrosive layer can prevent the aluminum-plastic film substrate from being corroded by the electrolyte, so that the barrier property of the aluminum-plastic film is increased, and the safety of the battery is further improved.
The preparation method of the aluminum-plastic film provided by the invention is characterized in that a layer of anticorrosive layer is directly prepared on the surface of the aluminum-plastic film substrate, so that the aluminum-plastic film with the anticorrosive function is obtained.
The secondary battery packaged by the aluminum plastic film has good packaging state, and the aluminum plastic film does not have any adverse effect on the electrical property and the packaging form of the secondary battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an aluminum plastic film provided in embodiment 1 of the present invention;
FIG. 2 is a DSC plot of polydopamine in example 1 of the present invention;
fig. 3 is a schematic view of an assembly structure of a secondary battery provided in embodiment 4 of the present invention.
Icon: 10-an aluminum plastic film; 11-a tie layer; 12-a layer of aluminum; 13-a protective layer; 14-an anticorrosive layer; 20-electric core; 21-positive pole piece; 22-a septum; 23-negative pole piece; 30-battery.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
One aspect of the invention provides an aluminum-plastic film, which comprises an aluminum-plastic film substrate, wherein the surface of the aluminum-plastic film substrate is provided with an anti-corrosion layer which is prevented from being corroded by electrolyte.
According to the aluminum-plastic film provided by the invention, the surface of the aluminum-plastic film substrate is provided with the anticorrosive layer, and in the liquid injection process, the anticorrosive layer can prevent the aluminum-plastic film substrate from being corroded by the electrolyte, so that the barrier property of the aluminum-plastic film is increased, and the safety of the battery is further improved.
It should be noted that, in the present invention, the material of the anticorrosive layer is not specifically limited, and the selection of the material of the anticorrosive layer may be adjusted according to the component and type of the electrolyte, as long as the anticorrosive requirement is met.
It can be understood that the anticorrosive coating is arranged on the outermost layer of the aluminum-plastic film substrate and is in contact with air, and in the liquid injection process of the battery, the outflow electrolyte is in contact with the anticorrosive coating, and the anticorrosive coating protects the aluminum-plastic film substrate from being corroded.
In some embodiments of the present invention, the aluminum plastic film substrate includes an adhesive layer, an aluminum layer and a protective layer, which are sequentially disposed, and the corrosion-resistant layer is disposed on a surface of the protective layer.
The bonding layer is in direct contact with the battery core and is resistant to electrolyte corrosion. In some embodiments of the invention, the tie layer is a PP layer or a PE layer. The specific bonding layer material is selected to improve the tensile property of the aluminum plastic film.
The aluminum layer acts as a support and prevents moisture from entering.
The protective layer is used for protecting the aluminum layer from being damaged, and the anticorrosive coating is arranged on the outer surface layer of the protective layer and can prevent electrolyte from corroding the protective layer in the electrolyte injection process.
In some embodiments of the invention, the barrier layer is a nylon layer or a PET layer. The wear-resisting property of the protective layer is improved by selecting specific protective layer materials, and the protective function of the aluminum-plastic film is further improved.
In some embodiments of the invention, the corrosion protection layer is a polydopamine layer, a bisphenol a type epoxy resin coating, a cyclic carbonate polyester coating, or a nano titanium organic coating; preferably a polydopamine layer.
The poly dopamine layer has the characteristics of strong acid resistance, corrosion resistance and high thermal stability (can resist the high temperature of 230 ℃), and can improve the corrosion resistance, the mechanical stability and the high temperature resistance of the aluminum plastic film.
In some embodiments of the invention, the corrosion protection layer has a thickness of 0.5 to 5 microns.
The thickness of the poly dopamine layer is controlled to be 0.5-5 microns, so that a good anti-corrosion effect can be achieved, the bonding effect of the poly dopamine layer and the protective layer can be improved, and the poly dopamine layer is prevented from being too thick to influence the flexibility of the aluminum plastic film.
The second aspect of the invention provides a preparation method of the aluminum-plastic film, which is to prepare an anticorrosive layer on the surface of the aluminum-plastic film substrate to obtain the aluminum-plastic film.
The preparation method of the aluminum-plastic film provided by the invention is characterized in that a layer of anticorrosive layer is directly prepared on the surface of the aluminum-plastic film substrate, so that the aluminum-plastic film with the anticorrosive function is obtained.
In some embodiments of the present invention, the surface of the aluminum-plastic film substrate is contacted with an alkaline dopamine solution, and the dopamine solution undergoes a polymerization reaction on the surface of the aluminum-plastic film substrate to obtain the aluminum-plastic film.
Only the alkaline dopamine solution is coated on the surface of the aluminum-plastic film substrate, and a polydopamine anticorrosive layer can be obtained on the surface of the aluminum-plastic film substrate by utilizing the self-polymerization reaction of dopamine. The preparation method is simple in process, the obtained polydopamine anticorrosive layer is high in mechanical stability, electrolyte can be effectively prevented from corroding an aluminum-plastic film matrix, meanwhile, the polydopamine anticorrosive layer can resist high temperature of 230 ℃, short circuit risks caused by corrosion of the outer layer of the battery are reduced, and the integral barrier property and safety of the battery are improved.
In some embodiments of the invention, the dopamine solution is an aqueous dopamine solution; the concentration of the dopamine solution is 0.2-5 mg/L, and the pH value is 7.1-8.5.
When the concentration of the dopamine solution is 0.2-5 mg/L and the pH value is 7.1-8.5, the polymerization speed of dopamine is high, and the obtained polydopamine layer is compact, low in air tightness, and good in mechanical strength and stability.
In some embodiments of the invention, the protective layer of the aluminum plastic film substrate is contacted with the dopamine solution for 2-24 hours, then the surface of the protective layer is washed to be neutral by deionized water, and then the protective layer is dried for 3-12 hours at 50-120 ℃ to obtain the aluminum plastic film.
It is understood that monomeric dopamine is capable of self-polymerization under alkaline conditions at room temperature. The reaction temperature of the monomeric dopamine is not specifically limited, as long as the monomeric dopamine undergoes a self-polymerization reaction. In addition, various modes are available for contacting the protective layer of the aluminum plastic film substrate with the dopamine solution, the dopamine solution can be coated or sprayed on the surface of the protective layer, or the protective layer can be contacted with the dopamine solution after the aluminum plastic film substrate is adsorbed by a tool, and the dopamine solution is subjected to autopolymerization reaction on the surface of the protective layer to obtain the polydopamine layer.
In some embodiments of the invention, the pH adjusting agent of the dopamine solution is tris buffer.
The pH value of the dopamine solution is adjusted by selecting the tris buffer solution, so that the dopamine polymerization reaction can be promoted.
The third aspect of the invention provides a use of the aluminum plastic film in packaging of a secondary battery.
A fourth aspect of the present invention provides a secondary battery, which includes a battery cell and the above aluminum-plastic film encapsulating the battery cell.
The secondary battery packaged by the aluminum plastic film has good packaging state, and the aluminum plastic film does not have any adverse effect on the electrical property and the packaging form of the secondary battery.
It is understood that the secondary battery provided by the present invention includes, but is not limited to, rechargeable batteries such as all-solid batteries, lithium ion batteries, lithium sulfur batteries, lithium air batteries, sodium ion batteries, and zinc air batteries, and is packaged by using the above aluminum plastic film. The secondary battery can be widely applied to 3C type, traffic, aerospace, military and fixed energy storage systems.
The secondary battery structure generally includes a positive electrode plate, a negative electrode plate, a separator interposed between the positive electrode plate and the negative electrode plate, and an electrolyte immersed in the separator.
The positive pole piece comprises a current collector and a positive pole material, wherein the positive pole material comprises a positive active substance, a conductive agent and a binder. The positive active material may be conventionally selected and combined from lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium iron phosphate, lithium manganate, lithium rich manganese base, lithium iron manganese phosphate, lithium vanadium fluoride phosphate, sulfur element, polyacrylonitrile sulfide, oxygen, sodium cobaltate, sodium iron phosphate or sodium manganate according to the type of the secondary battery. The mass ratio of the positive electrode active material is 70-99.9% calculated by taking the weight of the positive electrode material as a reference.
In some embodiments of the present invention, the conductive agent employed in the positive electrode material includes one or a combination of at least two of carbon nanotubes, graphene, conductive graphite, conductive carbon black, ketjen black, or carbon fibers; the mass ratio of the conductive agent is 0.1-15% calculated by taking the weight of the positive electrode material as a reference.
In some embodiments of the present invention, the binder employed in the positive electrode material includes one or a combination of at least two of polyvinylidene fluoride, polyvinyl alcohol, sodium carboxymethylcellulose, styrene-butadiene rubber, fluorinated rubber, or polyurethane; the mass ratio of the binder is 0.1-15% calculated by taking the weight of the cathode material as a reference.
In some embodiments of the invention, the negative electrode tab comprises a current collector and a negative electrode material, the negative electrode material comprising a negative electrode active material, a conductive agent, and a binder. The negative active material may be conventionally selected and combined from artificial graphite, natural graphite, mesocarbon microbeads, hard carbon, soft carbon, lithium titanate, silicon-based negative electrode, tin-based negative electrode, graphene, metallic lithium, or zinc alloy, depending on the type of battery. The mass ratio of the negative electrode active material is 70-99.9% calculated by taking the weight of the negative electrode material as a reference.
In some embodiments of the present invention, the conductive agent used in the negative electrode material includes one or a combination of at least two of carbon nanotubes, graphene, conductive graphite, conductive carbon black, ketjen black, and carbon fibers; the mass ratio of the conductive agent is 0.1-15% calculated by taking the weight of the negative electrode material as a reference.
In some embodiments of the present invention, the binder used in the negative electrode material is one or a combination of at least two of polyvinylidene fluoride, polyvinyl alcohol, sodium carboxymethylcellulose, styrene butadiene rubber, fluorinated rubber, and polyurethane; the mass ratio of the binder is 0.1-15% calculated by taking the weight of the negative electrode material as a reference.
In one embodiment of the present invention, the separator includes one or a combination of at least two of a single-layer PE film, a single-layer PP film, or a PP/PE/PP composite film.
The aluminum plastic film provided by the present invention will be described in further detail with reference to examples and comparative examples.
Example 1
As shown in fig. 1, the embodiment is an aluminum-plastic film, which includes an aluminum-plastic film base body and an anti-corrosion layer 14, the aluminum-plastic film base body sequentially includes, from inside to outside, a bonding layer 11, an aluminum layer 12 and a protective layer 13, the anti-corrosion layer 14 is located on an outer surface of the protective layer 13, and the bonding layer 11 is used for contacting with a battery core of a battery.
Wherein, the protective layer 13 is a nylon layer, the bonding layer 11 is a PP layer, and the anticorrosive layer is a polydopamine layer.
The preparation method of the aluminum plastic film provided in this embodiment is as follows: adding a trihydroxymethyl aminomethane buffer solution to adjust the pH value of the dopamine solution to 7.5, uniformly spraying a dopamine aqueous solution with the concentration of 2mg/L on the surface of a protective layer in an aluminum-plastic film substrate, washing the surface of the protective layer to be neutral by deionized water after 10 hours, and drying for 5 hours at 100 ℃ to obtain the aluminum-plastic film.
Fig. 2 shows a DSC curve of polydopamine, from which it can be seen that the collapse melting temperature of polydopamine is around 250 ℃, and therefore, polydopamine can endure a high temperature of 230 ℃.
Example 2
This example is an aluminum plastic film, which has the same structure as the aluminum plastic film in example 1, except that the aluminum plastic film is prepared by a different method.
The preparation method of the aluminum plastic film provided in this embodiment is as follows: folding the periphery of the aluminum-plastic film substrate to enable a protective layer in the aluminum-plastic film substrate to be in contact with a dopamine aqueous solution with the concentration of 1mg/L, adding a trihydroxymethyl aminomethane buffer solution to adjust the pH value of the dopamine solution to be 8.5, washing the surface of the protective layer to be neutral by deionized water after 4 hours, and drying for 6 hours at 80 ℃ to obtain the aluminum-plastic film.
Example 3
This example is an aluminum plastic film, which has the same structure as the aluminum plastic film in example 1, except that the aluminum plastic film is prepared by a different method.
The preparation method of the aluminum plastic film provided in this embodiment is as follows: folding the periphery of the aluminum-plastic film substrate to enable a protective layer in the aluminum-plastic film substrate to be in contact with 5mg/L dopamine aqueous solution, adding trihydroxymethyl aminomethane buffer solution to adjust the pH value of the dopamine solution to be 8.5, washing the surface of the protective layer to be neutral by deionized water after 6 hours, and drying at 60 ℃ for 10 hours to obtain the aluminum-plastic film.
Comparative example 1
The comparative example is an aluminum-plastic film comprising an outer protective layer, an intermediate aluminum layer and an inner tie layer. The outer layer structure of the aluminum-plastic film is not provided with an anticorrosive layer.
Example 4
As shown in fig. 3, the present embodiment is a secondary battery 30, which is a lithium iron phosphate lithium ion battery, and includes a battery cell 20 and an aluminum plastic film 10 for encapsulating the battery cell, where the battery cell 20 includes a positive electrode plate 21, a negative electrode plate 23, and a separator 22 and an electrolyte interposed between the positive electrode plate and the negative electrode plate, and the aluminum plastic film 10 is the aluminum plastic film provided in embodiment 2.
The secondary battery in the embodiment is prepared by adopting a lamination method, and specifically comprises the following steps:
a) preparing a negative electrode: mixing an active material of a negative electrode material, a conductive agent, a binder and a solvent to prepare slurry; coating the negative electrode material slurry on the surface of the negative electrode current collector, and cutting pieces after drying to obtain a negative electrode with the required size;
b) preparing an electrolyte: dissolving an electrolyte in a solvent, and fully stirring to obtain an electrolyte;
c) preparing a diaphragm: cutting the diaphragm into required size for later use;
d) preparing a positive electrode: mixing a positive electrode material active substance, a conductive agent, a binder and a solvent to prepare slurry; coating the positive electrode material slurry on the surface of the positive electrode current collector, and cutting pieces after drying to obtain a positive electrode with a required size;
step e) assembling: and (3) tightly stacking the prepared cathode, the diaphragm and the anode in turn in an inert gas or anhydrous oxygen-free environment, dripping electrolyte to completely soak the diaphragm, and packaging by using the aluminum-plastic film provided in the embodiment 2 to finish the assembly of the secondary battery.
Appearance detection
According to the preparation method of the secondary battery provided in the embodiment 4, 1000 lithium iron phosphate lithium ion batteries are respectively packaged by the aluminum plastic films provided in the embodiments 1 to 3 and are marked as test groups 1 to 3; the lithium iron phosphate lithium ion battery 1000 group, designated as control group 1, was encapsulated with the aluminum plastic film provided in comparative example 1. The 4000 lithium ion batteries were subjected to appearance inspection, and the number of lithium ion batteries in which corrosion occurred was recorded, and the results are shown in table 1.
Table 1 results of appearance test of each group
Appearance inspection item Number/group of occurrence of corrosion
Test group 1 0
Test group 2 0
Test group 3 0
Control group 1 11
As can be seen from the results of table 1, the appearance defects due to corrosion did not occur in the secondary batteries packaged with the aluminum-plastic films according to the present invention, whereas the appearance defects due to corrosion occurred in the secondary batteries packaged with the conventional aluminum-plastic films in a proportion of about 1.1%. Therefore, the aluminum plastic film provided by the invention has better anticorrosion effect.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. The aluminum-plastic film is characterized by comprising an aluminum-plastic film substrate, wherein the surface of the aluminum-plastic film substrate is provided with an anti-corrosion layer which is prevented from being corroded by electrolyte;
the aluminum-plastic film matrix comprises a bonding layer, an aluminum layer and a protective layer which are sequentially arranged, and the anticorrosive layer is arranged on the surface layer of the protective layer;
the anticorrosive layer is a polydopamine layer;
the preparation method of the aluminum-plastic film comprises the following steps: enabling a protective layer of the aluminum-plastic film substrate to be in contact with the dopamine solution for 2-24 hours, then washing the surface of the protective layer to be neutral by deionized water, and then drying at 50-120 ℃ for 3-12 hours to obtain the aluminum-plastic film;
the dopamine solution is a water-based dopamine solution; the concentration of the dopamine solution is 0.2-5 mg/mL, and the pH value is 7.1-8.5;
the thickness of the anticorrosive layer is 0.5-5 microns.
2. The method for preparing the aluminum-plastic film as claimed in claim 1, wherein the aluminum-plastic film is obtained by preparing a corrosion-resistant layer on the surface of the aluminum-plastic film substrate;
contacting the surface of the aluminum-plastic film substrate with an alkaline dopamine solution, and carrying out polymerization reaction on the dopamine on the surface of the aluminum-plastic film substrate to obtain the aluminum-plastic film;
the dopamine solution is a water-based dopamine solution; the concentration of the dopamine solution is 0.2-5 mg/mL, and the pH value is 7.1-8.5;
and (3) contacting the protective layer of the aluminum-plastic film substrate with the dopamine solution for 2-24 h, then washing the surface of the protective layer to be neutral by using deionized water, and then drying at 50-120 ℃ for 3-12h to obtain the aluminum-plastic film.
3. The method for preparing an aluminum-plastic film according to claim 2, wherein the pH regulator of the dopamine solution is a tris buffer.
4. Use of the aluminum-plastic film of claim 1 in packaging of secondary batteries.
5. A secondary battery comprising a cell and the aluminum-plastic film of claim 1 encapsulating the cell.
CN201810232136.3A 2018-03-20 2018-03-20 Aluminum plastic film, preparation method and application thereof, and secondary battery comprising aluminum plastic film Active CN108493360B (en)

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