Corrosion-resistant functional current collector, preparation method thereof, electrode sheet and battery
By incorporating rare earth metal elements into the oxide substrate, the oxide lattice structure is optimized, solving the problems of low hardness and easy corrosion of alumina ceramic materials, improving the density and corrosion resistance of functional current collectors, and enhancing the stability and performance of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YANGZHOU NANOPORE INNOVATIVE MATERIALS TECH LTD
- Filing Date
- 2025-01-08
- Publication Date
- 2026-07-24
AI Technical Summary
The oxide underlayer of existing functional current collectors is easily damaged or corroded during preparation and use, resulting in decreased adhesion and unstable performance. In particular, alumina ceramic materials have problems such as low hardness and easy growth.
Rare earth metal elements, such as La, Eu, Sm, and Ce, are incorporated into the oxide underlayer. A composite oxide underlayer is formed by magnetron sputtering and vacuum evaporation, which optimizes the oxide lattice structure and improves density and corrosion resistance.
It improves the hardness, toughness, and heat resistance of the oxide substrate, reduces porosity and film wrinkling issues, enhances the corrosion resistance of the current collector in the electrolyte, and improves the overall performance of the functional current collector.
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Figure BDA0005232918180000071 
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Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, specifically to a corrosion-resistant functional current collector, its preparation method, electrode sheet, and battery. Background Technology
[0002] Functional current collectors are "sandwich" structures consisting of an inner polymer layer, an outer oxide underlayer, and a metal layer. The polymer layer is typically made of polymer materials such as PET, PP, or PI. The oxide underlayer, such as an alumina layer, is attached to the polymer layer, and a metal layer, such as an aluminum metal layer, is attached to the outside of the oxide underlayer.
[0003] Oxidation undercoating enhances the interfacial bonding between the polymer layer and the metal layer through mechanical interlocking and chemical bonding. Furthermore, studies using orbital quantum dynamics to investigate the adhesion of polymer materials to the metal layer and the amorphous oxide surface reveal that the introduction of the metal oxide layer enables the carbonyl oxygen in the thin film substrate to form strong O-metal ionic bonds with the metal atoms in the metal oxide, such as O-Al. Similarly, during the deposition process, silicon oxide also forms chemical bonds with oxygen-containing functional groups on the surface of the polymer material, thereby improving the interfacial bonding.
[0004] While using an oxide underlayer can improve the adhesion between the metal layer and the polymer film, the oxide underlayer is very thin, only about 1 nm thick, resulting in low hardness and corrosion resistance. This makes it susceptible to damage during metal layer fabrication, such as being melted by splashed molten metal or other impurities during evaporation, or being corroded by electrolyte penetration during battery use. Furthermore, while oxide underlayers like alumina ceramics possess high hardness, mechanical strength, and good chemical stability, they also suffer from high sintering temperatures and easy grain growth, leading to performance degradation. Summary of the Invention
[0005] The purpose of this invention is to provide a corrosion-resistant functional current collector, its preparation method, electrode sheet, and battery, thereby improving the performance of composite current collectors.
[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:
[0007] The first aspect of this application provides a corrosion-resistant functional current collector, comprising a polymer layer, an oxide underlayer, and a metal layer; the polymer layer is coated with an oxide underlayer, and the outer side of the oxide underlayer is a metal layer, characterized in that: the oxide underlayer contains rare earth metal elements.
[0008] The rare earth metal element is selected from at least one of La, Eu, Sm, and Ce; the oxide underlayer is an alumina ceramic material.
[0009] The second aspect of this application provides a method for preparing a corrosion-resistant functional current collector, comprising the following steps: preparing an oxide underlayer on the surface of a polymer layer, incorporating rare earth metal elements during the preparation of the oxide underlayer to form a composite oxide underlayer containing rare earth metal elements, and preparing a metal layer on the surface of the composite oxide underlayer containing rare earth metal elements.
[0010] To optimize the above technical solution, the specific measures also include:
[0011] The oxide underlayer and the metal layer are prepared by at least one of the following methods: physical vapor deposition, chemical vapor deposition, in-situ molding, or coating.
[0012] A composite oxide underlay containing rare earth metal elements is prepared on the surface of a polymer layer using magnetron sputtering technology. The magnetron sputtering targets are rare earth oxide targets and underlay metal oxide targets, and the magnetron sputtering process is carried out under a protective atmosphere.
[0013] Furthermore, the ratio of rare earth oxide target to underlying metal oxide target is 1-4:16-20; the power density of magnetron sputtering is 40-55 W / cm². 2 .
[0014] Furthermore, the rare earth oxide target is at least one of La2O3, Eu2O3, Sm2O3 and CeO2; the underlying metal oxide target is an alumina target.
[0015] Furthermore, a metal layer is prepared on the surface of a composite oxide substrate containing rare earth metal elements by vacuum evaporation.
[0016] A third aspect of this application provides an electrode sheet comprising a corrosion-resistant functional current collector prepared by the method provided in the first aspect of this application or the method provided in the second aspect of this application.
[0017] A fourth aspect of this application provides a battery comprising the electrode sheet provided in the third aspect of this application.
[0018] Compared with the prior art, the beneficial effects of the present invention are:
[0019] This invention improves the oxide lattice arrangement of the oxide layer by adding rare earth metal elements to the oxide underlayer of the functional current collector, thereby enhancing its density, hardness, toughness, heat resistance, and corrosion resistance. This reduces the porosity caused by molten metal or other impurities splashing through the functional current collector, as well as the problems of film wrinkling and thermal shrinkage during unwinding and winding. Furthermore, the increased density and corrosion resistance can improve the problem of easy corrosion of the polymer layer of the functional current collector in the electrolyte, thus achieving the goal of optimizing the performance of the functional current collector.
[0020] Rare earth metals, as additives, can optimize the microstructure and improve the mechanical properties of alumina ceramic substrates by combining with oxides in the substrate. This is especially true for alumina ceramic substrates. Studies have shown that doping with rare earth materials such as La2O can significantly improve the hardness of alumina ceramics; doping with Eu2O3 can improve the bulk density and mechanical properties of alumina ceramics; doping with rare earth materials such as Sm2O3 can significantly improve the relative density, flexural strength, and fracture toughness of alumina ceramics; and doping with rare earth materials such as CeO2 can significantly improve the strength of alumina ceramics. By combining different rare earth materials, different optimization effects can be obtained, allowing their complementary advantages to create a solution where the effect is greater than the sum of its parts (1+1>2).
[0021] In this invention, when preparing a metal layer on the surface of a composite oxide substrate containing rare earth metal elements, the metal layer is preferably prepared by vacuum evaporation. The vacuum evaporation process allows the rare earth metal and the oxide in the oxide substrate to form a solid solution, thereby activating the crystal lattice and further improving the performance of the oxide substrate. Detailed Implementation
[0022] The present invention will be further described in detail below through embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All technologies implemented based on the above content of the present invention fall within the scope of the present invention.
[0023] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the reagents, methods and equipment used are conventional reagents, methods and equipment in this technical field.
[0024] For the sake of brevity, this article only discloses some numerical values and the range of options. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range. Similarly, any upper limit can be combined with any other upper limit to form an unspecified range; the options in the range of options can also be combined arbitrarily.
[0025] Unless otherwise stated, the terms used in this application have their common meanings as commonly understood by those skilled in the art. Unless otherwise stated, the numerical values of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art.
[0026] This invention provides a corrosion-resistant functional current collector, comprising a polymer layer, an oxide underlayer, and a metal layer; the polymer layer is coated with an oxide underlayer, and the outer side of the oxide underlayer is a metal layer, characterized in that: the oxide underlayer contains rare earth metal elements.
[0027] In some embodiments, the rare earth metal element is selected from at least one of La, Eu, Sm, and Ce.
[0028] In some preferred embodiments, the oxide underlayer is an alumina ceramic material.
[0029] The present invention also provides a method for preparing a corrosion-resistant functional current collector, comprising the following steps: preparing an oxide underlayer on the surface of a polymer layer, incorporating rare earth metal elements during the preparation of the oxide underlayer to form a composite oxide underlayer containing rare earth metal elements, and preparing a metal layer on the surface of the composite oxide underlayer containing rare earth metal elements.
[0030] This application adds rare earth metal elements to the oxide underlayer of the functional current collector to improve the oxide lattice arrangement of the oxide underlayer, thereby increasing the density, hardness, toughness, heat resistance and corrosion resistance of the oxide underlayer. This reduces the porosity caused by the functional current collector being melted through by splashed molten metal or by other impurities, as well as the problems of film wrinkling and thermal shrinkage during winding and unwinding. In addition, the increased density and corrosion resistance can improve the problem of easy corrosion of the polymer layer of the functional current collector in the electrolyte.
[0031] Non-limiting examples of polymeric material substrates in this application may include one or more of the following substrates: polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), and polyethylene (PE).
[0032] The oxide underlayer and the metal layer of this application are prepared by at least one of the following methods: physical vapor deposition, chemical vapor deposition, in-situ forming, or coating. Among them, the physical vapor deposition method is preferably vacuum evaporation and magnetron sputtering; the chemical vapor deposition method is preferably atmospheric pressure chemical vapor deposition and plasma-enhanced chemical vapor deposition; the in-situ forming method is preferably a method of forming a metal oxide passivation layer in-situ on the surface of the metal layer; and the coating method is preferably die coating, blade coating, or extrusion coating.
[0033] In some preferred embodiments, a composite oxide underlay containing rare earth metal elements is prepared on the surface of a polymer layer by magnetron sputtering. The magnetron sputtering uses rare earth oxide targets and underlay metal oxide targets, and the magnetron sputtering process is carried out under a protective atmosphere.
[0034] Non-limiting examples of the protective atmosphere in this application may use helium, argon, or rare gases.
[0035] In some embodiments, the ratio of rare earth oxide target to substrate metal oxide target is 1-4:16-20; the power density of magnetron sputtering is 40-55 W / cm². 2 .
[0036] In some embodiments, the rare earth oxide target is at least one of La2O3, Eu2O3, Sm2O3 and CeO2; the underlying metal oxide target is an alumina target.
[0037] Combining rare earth metals with oxides in the oxide underlayment can optimize the microstructure of the oxide underlayment and improve its mechanical properties, especially for alumina ceramic underlayment:
[0038] Experiments have shown that adding rare earth metals to the alumina ceramic material as a base layer can refine grains, improve microstructure, and inhibit alumina grain growth, thereby increasing the density of the alumina layer. Adding rare earth metals to the alumina ceramic material as a base layer can reduce bridging, bending, and bifurcation of cracks in the alumina layer, increasing fracture energy and thus enhancing mechanical strength, toughness, and high-temperature mechanical properties. Adding rare earth metals to the alumina ceramic material as a base layer can also increase the hardness of the alumina layer, thereby mitigating the porosity caused by aluminum sputtering and reducing residual stress during the film production and winding process.
[0039] Experimental studies on different rare earth doped materials have revealed that: La2O doping can significantly improve the hardness of alumina ceramics; Eu2O3 doping can improve the bulk density and mechanical properties of alumina ceramics; Sm2O3 doping can significantly improve the relative density, flexural strength and fracture toughness of alumina ceramics; and CeO2 doping can significantly improve the strength of alumina ceramics.
[0040] In some preferred embodiments, the doped rare earth metal element is La2O3.
[0041] In some preferred embodiments, a metal layer is prepared on the surface of a composite oxide substrate containing rare earth metal elements by vacuum evaporation. The vacuum evaporation process allows the rare earth metals and oxides in the oxide substrate to form a solid solution, thereby activating the crystal lattice and further optimizing the performance of the oxide substrate.
[0042] The present invention also provides an electrode sheet comprising the corrosion-resistant current collector described in this application.
[0043] The present invention also provides a battery comprising the electrode sheet described in this application.
[0044] In some embodiments, the battery of this application can be assembled into a battery module, and the number of batteries contained in the battery module can be one or more, the specific number of which can be selected by those skilled in the art according to the application and capacity of the battery module.
[0045] In some embodiments, the battery modules described above can also be assembled into a battery pack, and the number of battery modules contained in the battery pack can be one or more, the specific number of which can be selected by those skilled in the art according to the application and capacity of the battery pack.
[0046] The technical solution of the present invention will be further described below through specific embodiments, wherein the selected base film is a PET film with a thickness of 6 to 8 μm, and a composite oxide underlayer containing alumina and rare earth metals is deposited on the base film by magnetron sputtering.
[0047] Example 1
[0048] In this embodiment, La2O3 is added to the oxide substrate by magnetron sputtering, followed by aluminum deposition by vacuum evaporation. The specific operation is as follows:
[0049] The PET film was placed inside a magnetron sputtering machine, with the target arrangement set as 4 La2O3 targets and 16 alumina targets (all with a purity of 99.95%), and the magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 The protective gas is argon at a flow rate of 50 ml / min. An oxide underlayer with a thickness of approximately 1 nm is formed on both sides of the base film. Then, the magnetron sputtered film is fixed to a winding carriage via vacuum evaporation. The film is then unwound and wound, and tension is adjusted, with the unwound end at 120 N and the winding end at 100 N. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 N is applied. -3 Pa, start the winding carriage, control the speed at 280-300 m / min, simultaneously heat the evaporation boat and feed the aluminum wire at a speed of 300-350 mm / min, and control the vacuum degree at 5*10 -2Pa; the heating temperature is 1000-1200℃, and 18 layers of aluminum are deposited on both sides of the oxide base film in this way.
[0050] Example 2
[0051] In this embodiment, Sm2O3 is added to the oxide substrate by magnetron sputtering, followed by aluminum deposition by vacuum evaporation. The specific operation is as follows:
[0052] The PET film was placed inside a magnetron sputtering machine, with the target arrangement set as 4 Sm₂O₃ targets and 16 alumina targets (all with a purity of 99.95%), and the magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 The protective gas is argon at a flow rate of 50 ml / min. An oxide underlayer with a thickness of approximately 1 nm is formed on both sides of the base film. Then, the magnetron sputtered film is fixed to a winding carriage via vacuum evaporation. The film is then unwound and wound, and tension is adjusted, with the unwound end at 120 N and the winding end at 100 N. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 N is applied. -3 Pa, start the winding carriage, control the speed at 280-300 m / min, simultaneously heat the evaporation boat and feed the aluminum wire at a speed of 300-350 mm / min, and control the vacuum degree at 5*10 -2 Pa; the heating temperature is 1000-1200℃, and 18 layers of aluminum are deposited on both sides of the oxide base film in this way.
[0053] Example 3
[0054] In this embodiment, CeO2 is added to the oxide underlayer by magnetron sputtering, followed by aluminum deposition by vacuum evaporation. The specific operation is as follows:
[0055] The PET film was placed inside a magnetron sputtering machine, with the target arrangement set as 4 CeO2 targets and 16 alumina targets (all with a purity of 99.95%), and the magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 The protective gas is argon at a flow rate of 50 ml / min. An oxide underlayer with a thickness of approximately 1 nm is formed on both sides of the base film. Then, the magnetron sputtered film is fixed to a winding carriage via vacuum evaporation. The film is then unwound and wound, and tension is adjusted, with the unwound end at 120 N and the winding end at 100 N. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 N is applied. -3 Pa, start the winding carriage, control the speed at 280-300 m / min, simultaneously heat the evaporation boat and feed the aluminum wire at a speed of 300-350 mm / min, and control the vacuum degree at 5*10-2 Pa; the heating temperature is 1000-1200℃, and 18 layers of aluminum are deposited on both sides of the oxide base film in this way.
[0056] Example 4
[0057] In this embodiment, La₂O₃ and Eu₂O₃ in a 1:1 mass ratio are added to the oxide substrate by magnetron sputtering, followed by aluminum deposition by vacuum evaporation. The specific operation is as follows:
[0058] The PET film was placed inside a magnetron sputtering machine. The target arrangement consisted of two La₂O₃ targets, two Eu₂O₃ targets, and sixteen alumina targets (all with a purity of 99.95%). The magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 The protective gas is argon at a flow rate of 50 ml / min. An oxide underlayer with a thickness of approximately 1 nm is formed on both sides of the base film. Then, the magnetron sputtered film is fixed to a winding carriage via vacuum evaporation. The film is then unwound and wound, and tension is adjusted, with the unwound end at 120 N and the winding end at 100 N. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 N is applied. -3 Pa, start the winding carriage, control the speed at 280-300 m / min, simultaneously heat the evaporation boat and feed the aluminum wire at a speed of 300-350 mm / min, and control the vacuum degree at 5*10 -2 Pa; the heating temperature is 1000-1200℃, and 18 layers of aluminum are deposited on both sides of the oxide base film in this way.
[0059] Example 5
[0060] This embodiment is largely the same as Embodiment 4, except that after preparing the oxide underlayer by magnetron sputtering, aluminum is deposited by magnetron sputtering instead of vacuum evaporation. The specific operation is as follows:
[0061] The PET film was placed inside a magnetron sputtering machine. The target arrangement consisted of two La₂O₃ targets, two Eu₂O₃ targets, and sixteen alumina targets (all with a purity of 99.95%). The magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 Pa, with argon as the protective gas at a flow rate of 50 ml / min, forming an oxide underlayer thickness of approximately 1 nm on both sides of the base film; then, the aluminum target is replaced, and a voltage of 200V is applied to the target, with 120N at the film feeding end and 100N at the winding end. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 is applied. -3Pa, start winding, speed is 25m / min, the thickness of aluminum sputtering is 20nm each time, and aluminum is deposited on both sides of the film 5 times in this way.
[0062] Comparative Example 1
[0063] In this comparative example, an oxide underlayer was prepared on a base film by magnetron sputtering, followed by aluminum deposition by vacuum evaporation. The specific operation is as follows:
[0064] The PET film was placed inside a magnetron sputtering machine, with 20 alumina targets (all with a purity of 99.95%) set, and the magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 The protective gas is argon at a flow rate of 50 ml / min. An oxide underlayer with a thickness of approximately 1 nm is formed on both sides of the base film. Then, the magnetron sputtered film is fixed to a winding carriage via vacuum evaporation. The film is then unwound and wound, and tension is adjusted, with the unwound end at 120 N and the winding end at 100 N. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 N is applied. -3 Pa, start the winding carriage, control the speed at 280-300 m / min, simultaneously heat the evaporation boat and feed the aluminum wire at a speed of 300-350 mm / min, and control the vacuum degree at 5*10 -2 Pa; the heating temperature is 1000-1200℃, and 18 layers of aluminum are deposited on both sides of the oxide base film in this way.
[0065] Comparative Example 2
[0066] This comparative example is largely the same as Comparative Example 1, except that after preparing the oxide underlayer by magnetron sputtering, aluminum is deposited by magnetron sputtering instead of vacuum evaporation. The specific operation is as follows.
[0067] The PET film was placed inside a magnetron sputtering machine, with 20 alumina targets (all with a purity of 99.95%) set, and the magnetron sputtering power density was 50 W / cm². 2 The vacuum degree is 5*10 -4 Pa, with argon as the protective gas at a flow rate of 50 ml / min, forming an oxide underlayer thickness of approximately 1 nm on both sides of the base film; then, the aluminum target is replaced, and a voltage of 200V is applied to the target, with 120N at the film feeding end and 100N at the winding end. After the winding carriage enters the evaporation chamber, a vacuum of 5*10 is applied. -3 Pa, start winding, speed is 25m / min, the thickness of aluminum sputtering is 20nm each time, and aluminum is deposited on both sides of the film 5 times in this way.
[0068] Experimental testing:
[0069] 1. Test Construction Method
[0070] The tensile properties and surface pinhole-related properties of the functional current collectors prepared in the above embodiments and comparative examples were tested.
[0071] (1) Tensile property test
[0072] The room temperature tensile strength of the functional current collector was tested using an electronic universal testing machine. The test conditions were: gauge length 10 mm, tensile speed 100 mm / min, width 15 mm, and other requirements were determined according to the method specified in GB / T 1040.3-2006.
[0073] (2) Surface pinhole test
[0074] The number of pinholes on the surface of the functional current collector is tested using a CCD machine. The CCD line scan camera installed on the production line is used for real-time synchronous scanning through backlight imaging to capture light leakage points and calculate the number of holes.
[0075] (3) Heat distortion test
[0076] Samples of the functional current collector were taken, each sample measuring 5*10cm. After being placed at different temperatures for 30 minutes with a force of 10N applied, the length change in the longitudinal (MD) direction was measured using calipers. The thermal elongation was calculated by comparing the length with the length before the test, using the formula: Thermal elongation = (L1...) 形变后 -L1 形变前 ) / L1 形变前 .
[0077] 2. Test Results
[0078] The results of testing the tensile properties, surface pinholes, residual stress, and other related properties of the functional current collectors prepared in the above embodiments and comparative examples are shown in Table 1, and the results of the thermal deformation test are shown in Table 2.
[0079] Table 1 shows the tensile strength, surface pinhole data, and residual stress of the functional current collectors in the embodiments and comparative examples.
[0080]
[0081]
[0082] Table 2 shows the thermal deformation data of the functional current collector in the embodiments and comparative examples (with a force of 10 N applied).
[0083] Example 1 0 0 0.41％ 0.61％ Example 2 0 0 0.35％ 0.53％ Example 3 0 0 0.31％ 0.46％ Example 4 0 0 0.22％ 0.34％ Example 5 0 0 1.65％ 3.21％ Comparative Example 1 2.78％ 5.53％ 6.12％ 9.8％ Comparative Example 2 3.03％ 5.73％ 6.87％ 10.04％
[0084] As can be seen from Tables 1 and 2, the functional current collectors provided in Examples 1 to 4 of the present invention, by adding rare earth oxides to the oxide underlayer to form a composite oxide underlayer, can refine the grains, improve the microstructure, and at the same time reduce the occurrence of bridging, bending, and bifurcation of cracks in the alumina layer, thereby increasing the fracture energy, thereby increasing the mechanical strength, toughness and high-temperature mechanical properties, improving the porosity caused by aluminum sputtering, and reducing the residual stress caused during the film production and winding process.
[0085] Further in-depth research revealed that the effects of adding different rare earth oxides varied. For Example 1, the addition of La2O3 could improve the hardness and density of the base layer. However, when compared with Examples 2 and 3, it was found that the increase in hardness in Example 1 could significantly reduce the number of pores, but the tensile strength was not as good as that in Examples 2 and 3. A similar conclusion was reached when comparing Examples 2 and 3.
[0086] Comparative studies of Example 4 with Examples 1-3 revealed that by adding two rare earth oxides, namely, the doped rare earth material La2O, the hardness of the alumina layer can be significantly improved, and Eu2O3 can improve the bulk density and mechanical properties of the alumina layer. While improving the density and hardness of the underlayer, mechanical strength and high-temperature mechanical properties are guaranteed. Therefore, a better solution can be formed by selecting different rare earth materials and combining them, with their advantages complementing each other, resulting in a solution where the effect is greater than 1+1>2.
[0087] Example 5 uses magnetron sputtering to deposit aluminum. The tensile strength, number of pores, and residual stress are all worse than those of the vacuum evaporation method in Examples 1-4. This is mainly because the metal layer is prepared on the surface of the composite oxide substrate of rare earth metal elements. The vacuum evaporation process can make rare earth metals and oxides in the oxide substrate form solid solutions, thereby activating the crystal lattice and further improving the performance of the oxide substrate.
[0088] Comparative Examples 1 and 2 used raw alumina as a base coat and then plated aluminum using different methods. Compared to base coats doped with rare earth metals, the tensile strength, number of pores, and residual stress were significantly worse. When the base coat did not contain rare earth metals, as in Comparative Examples 1 and 2, the experimental results of choosing between vacuum evaporation and magnetron sputtering for aluminum plating were not significantly different. In addition, vacuum aluminum plating carries the risk of aluminum sputtering, which may introduce more surface pinholes and reduce tensile strength.
[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.
Claims
1. A corrosion-resistant functional current collector, comprising a polymer layer, an oxide underlayer, and a metal layer; wherein the polymer layer is coated with an oxide underlayer, and the outer side of the oxide underlayer is a metal layer, characterized in that: The oxide underlayer contains rare earth metal elements La and Eu; the oxide underlayer is an alumina ceramic material underlayer. The preparation method includes the following steps: preparing an oxide underlayer on the surface of a polymer layer; incorporating rare earth metal elements during the preparation of the oxide underlayer to form a composite oxide underlayer containing rare earth metal elements; and preparing a metal layer on the surface of the composite oxide underlayer containing rare earth metal elements. Specifically, La2O3 and Eu2O3 are added to the oxide underlayer by magnetron sputtering, followed by aluminum deposition by vacuum evaporation.
2. The corrosion-resistant functional manifold according to claim 1, characterized in that: A composite oxide underlay containing rare earth metal elements is prepared on the surface of a polymer layer using magnetron sputtering technology. The magnetron sputtering targets are rare earth oxide targets and underlay metal oxide targets, and the magnetron sputtering process is carried out under a protective atmosphere.
3. The corrosion-resistant functional manifold according to claim 2, characterized in that: The ratio of rare earth oxide target to substrate metal oxide target is 1-4:16-20; the power density of magnetron sputtering is 40-55 W / cm³. 2 .
4. An electrode sheet, characterized in that: It includes the functional current collector as described in any one of claims 2 and 3.
5. A battery, characterized in that: It includes the electrode sheet as described in claim 4.