Highly elastic composite current collector

Abstract

A highly elastic composite current collector including a thin film support layer, on two opposite surfaces of which a rubber layer and a metal layer are sequentially provided, and a manufacturing method thereof. By compounding the rubber layers on the two opposite surfaces of the thin film support layer, the rubber layer has high ductility and strong impact resistance, which not only improves the ductility and tensile strength of the thin film support layer, but also plays a protective role for the thin film support layer, effectively prevents the thin film support layer from breaking, improves the deformation resistance of the battery, and ensures the safety of the battery.

Description

[Technical field]

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a highly elastic composite current collector and a method for manufacturing the same. [Background technology]

[0002] At present, there are two types of composite current collectors: copper current collectors and aluminum current collectors. The copper current collectors and aluminum current collectors are both composed of two parts, including a thin film support layer in the middle and metal layers on the two opposite surfaces of the thin film support layer. The thickness of the metal layer is usually required to be about 1 μm, and the manufacturing form of the composite current collector is completed by a vacuum deposition process, but only a metal layer with a thickness of 50 to 100 nm can be deposited on the two surfaces of the thin film support layer at one time. In order to achieve the required thickness of the product, the two surfaces of the thin film support layer each require about 10 depositions, and the tensile strength and elongation rate of the thin film support layer are attenuated to different degrees each time, so that the thin film support layer is prone to breakage during the subsequent processing process, and further deteriorates the deformation resistance ability of the battery. In addition, low tensile strength and elongation rate increase the risk that the battery will fail the safety test for pressure and heavy impact, further affecting the safety of the battery. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, it is necessary to provide a highly elastic composite current collector and a manufacturing method thereof, which can not only improve the ductility and elongation strength of the thin film support layer, but also play a protective role for the thin film support layer, effectively prevent the thin film support layer from breaking, improve the deformation resistance of the battery, and further ensure the safety of the battery. [Means for solving the problem]

[0004] The thin film support layer includes a rubber layer and a metal layer provided in sequence on two opposite surfaces of the thin film support layer, The rubber layer (200) is bonded to two opposite surfaces of the thin film support layer (100), forming a highly elastic composite current collector.

[0005] By compounding the rubber layers on the two opposite surfaces of the thin film support layer, the rubber layers have high ductility and strong impact resistance, which not only improves the ductility and tensile strength of the thin film support layer, but also plays a protective role for the thin film support layer, effectively prevents the thin film support layer from breaking, and improves the deformation resistance of the battery. At the same time, the thin film support layer has high tensile strength and strong impact resistance, which reduces the risk of the battery failing the safety test for pressure and heavy impact, and further ensures the safety of the battery.

[0006] In one embodiment therein, the rubber layer comprises at least one of emulsion polymerized styrene butadiene rubber (ESBR), solution polymerized styrene butadiene rubber (SSBR), butadiene rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber (EPR), butyl rubber, and natural rubber (NR).

[0007] In one embodiment therein, the rubber layer comprises ethylene propylene diene rubber (EPDM) or linear low density polyethylene (LLDPE).

[0008] In one embodiment, the thin film support layer comprises at least one of an insulating polymer material, an insulating polymer composite material, a conductive polymer material, and a conductive polymer composite material.

[0009] The insulating polymer composite material is a composite material made of an insulating polymer material and an inorganic material, where the inorganic material can be at least one of a ceramic material, a glass material, and a ceramic composite material.

[0010] The conductive polymer material employs at least one of doped polythiazyl and doped polyacetylene.

[0011] The conductive polymer composite material employs a composite material made of an insulating polymer material and a conductive material.

[0012] In one embodiment thereof, the insulating polymer material includes at least one of polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene (PPE), polyvinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyparaphenylene terephthalamide (PPTA), polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), cellulose, starch, protein, derivatives thereof, crosslinked bodies thereof, and copolymers thereof.

[0013] In one embodiment, the metal layer is a metallic aluminum layer or a metallic copper layer.

[0014] In one embodiment, the purity of the metal layer is greater than or equal to 99.8%.

[0015] In one embodiment thereof, the thickness range of the thin film support layer is 1 μm to 25 μm, and the thickness range of the metal layer is 0.5 μm to 1.5 μm.

[0016] In one embodiment, the thickness of the rubber layer is in the range of 0.5 μm to 1 μm.

[0017] The present application provides a method for producing the above-mentioned highly elastic composite current collector, comprising: Melting the material of the rubber layer; Compounding the molten material of the rubber layer to the two opposing surfaces of the thin film support layer by 3D printing to form the rubber layer on the two opposing surfaces of the thin film support layer; and vapour-depositing the metal layer on the surface of the rubber layer. Effect of the Invention

[0018] In the above-mentioned embodiment, the rubber layer is compounded on two opposite surfaces of the thin film support layer, so that the rubber layer has high ductility and strong impact resistance, which not only improves the ductility and elongation strength of the thin film support layer, but also plays a protective role for the thin film support layer, effectively prevents the thin film support layer from breaking, and improves the deformation resistance of the battery. At the same time, the thin film support layer with high ductility and strong impact resistance reduces the risk of the battery failing the safety test for pressure and heavy impact, and further ensures the safety of the battery from breaking. The purity of the metal layer is 99.8% or more, and the metal layer is a metallic aluminum layer or a metallic copper layer, and the high-purity metallic aluminum has properties such as low deformation resistance, high electrical conductivity and good plasticity, and the high-purity metallic copper has good ductility, thermal conductivity and electrical conductivity. [Brief description of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of the structure of a composite current collector according to an embodiment of the present invention; [Diagram 2] 2 is a flow chart of the steps of a method for manufacturing a composite current collector according to one embodiment of the present invention. [Diagram 3] 2 is a flow chart showing steps of a method for manufacturing a composite current collector according to a comparative example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention, and the illustrative embodiments of the present invention and the description thereof are intended to interpret the present invention and are not intended to unduly limit the present invention.

[0021] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments are briefly described below. The drawings in the following description are some embodiments of the present invention, and it is obvious to those skilled in the art that they can obtain other drawings according to these drawings without paying creative labor.

[0022] In order to more clearly explain the above objects, features and advantages of the present invention, the following detailed description of the specific embodiment of the present invention will be given with reference to the drawings. In order to fully understand the present invention, many specific details are described in the following description. However, the present invention is not limited by the specific embodiment disclosed below, because the present invention can be implemented in other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention.

[0023] In the description of the present invention, the orientations and positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientations and positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of the present invention, and are not intended to indicate or suggest that the devices or elements mentioned have a specific orientation and must be configured and operated from a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0024] Additionally, the terms "first" and "second" are merely for descriptive purposes and should not be understood as implicitly indicating the number of the designated technical features, indicating or suggesting their relative importance. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "plurality" means at least two, e.g., two, three, etc., unless otherwise limited.

[0025] In the description of the present invention, the terms "attached", "connected", "connected" and "fixed" should be understood in a broad sense unless otherwise clearly specified or limited. For example, they may be fixedly connected, detachably connected or integral, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or communicated inside two parts or interacting with each other. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0026] In the present invention, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature via an intermediate medium. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature means that the first feature may be directly above and diagonally above the second feature, or simply that the first feature is higher in horizontal height than the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature means that the first feature may be directly below and diagonally below the second feature, or simply that the first feature is lower in horizontal height than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed" or "mounted" on another element, the element may be directly on the other element, or there may be intervening elements present. When an element is referred to as being "connected" to another element, it may be directly connected to the other element, or there may be intervening elements present at the same time. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar terms are merely for descriptive purposes and do not represent the only embodiments.

[0028] The applicant has discovered that the gradual decline in the tensile strength and elongation rate of the thin film support layer 100 is mainly due to the fact that polymer materials are often used for the thin film support layer 100, and the metal atoms evaporated during the deposition process of the polymer material have a lot of energy. These metal atoms with a lot of energy constantly collide with the thin film support layer 100, causing the chemical bonds on the surface of the thin film support layer 100 to break, resulting in defects on the surface of the thin film support layer 100 and further destroying the mechanical strength of the thin film support layer 100.

[0029] 1, one embodiment of the present invention provides a highly elastic composite current collector 10 including a thin film support layer 100, in which a rubber layer 200 and a metal layer 300 are sequentially provided on two opposite surfaces of the thin film support layer 100, which can not only improve the ductility and tensile strength of the thin film support layer 100, but also provide a protective role for the thin film support layer 100. The metal layer 300 is provided on the surface of the rubber layer 200.

[0030] Specifically, the highly elastic composite current collector 10 has a pin puncture strength of 50 gf or more, an MD elongation strength of 200 MPa or more, a TD elongation strength of 200 MPa or more, an MD elongation rate of 50% or more, and a TD elongation rate of 50% or more. Exemplarily, the highly elastic composite current collector 10 has a pin puncture strength of 80 gf, an MD elongation strength of 400 MPa, and a TD elongation strength of 400 MPa. The MD elongation rate is 120% and the TD elongation rate is 120%. Note that MD (Machine Direction) refers to the vertical direction, and TD (Transverse Direction, perpendicular to the mechanical direction) refers to the horizontal direction.

[0031] The thin film support layer 100 includes two surfaces that are opposite to each other in the thickness direction. The rubber layers 200 are respectively compounded on the two opposite surfaces of the thin film support layer 100. By compounding the rubber layers 200 on the two opposite surfaces of the thin film support layer 100, the rubber layers 200 have high ductility and strong impact resistance, which not only improves the ductility and elongation strength of the thin film support layer 100 but also plays a protective role for the thin film support layer 100, and can effectively prevent the phenomenon in which the chemical bonds on the surface of the thin film support layer 100 are broken due to the collision of metal atoms with a lot of energy with the thin film support layer 100, thereby ensuring the mechanical strength of the thin film support layer 100, improving the deformation resistance of the battery, and further ensuring the safety of the battery.

[0032] 1, according to some embodiments of the present application, the rubber layer 200 preferably includes at least one of emulsion polymerized styrene butadiene rubber (ESBR), solution polymerized styrene butadiene rubber (SSBR), butadiene rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber (EPR), butyl rubber, and natural rubber (NR), although the present application is not limited thereto.

[0033] In addition, emulsion polymerization styrene butadiene rubber (ESBR) has physical and mechanical properties such as high ductility, strong impact resistance, good abrasion resistance and aging resistance. Solution polymerization styrene butadiene rubber (SSBR) has the advantages of high ductility, strong impact resistance, abrasion resistance, cold resistance, low heat generation, low shrinkage, high purity, and fast vulcanization speed, and also has physical and mechanical properties such as low rolling resistance, excellent wet skid resistance and abrasion resistance. Butadiene rubber has physical and mechanical properties such as high ductility, strong impact resistance, high elasticity, low heat generation and rolling resistance, and excellent abrasion resistance and fatigue resistance.

[0034] Isoprene rubber has physical and mechanical properties such as excellent elasticity, cold resistance, high ductility, and strong impact resistance. Chloroprene rubber is resistant to oil, heat, fire, sunlight, ozone, acids, bases, and chemical reagents, and has physical and mechanical properties such as high ductility, strong impact resistance, reversible crystallinity, and good adhesion. Ethylene propylene rubber (EPR) has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance because its main chain is made of chemically stable saturated hydrocarbons, and has physical and mechanical properties such as good chemical resistance, electrical insulation, high ductility, strong impact resistance, low temperature resistance, low density, high filling, hot water resistance, and water vapor resistance. Natural rubber (NR) has characteristics such as high elasticity, high ductility, strong impact resistance, good abrasion resistance, and easy adhesion to other materials.

[0035] Referring to FIG. 1, according to some embodiments of the present application, the rubber layer 200 is preferably ethylene propylene diene rubber (EPDM) or linear low density polyethylene (LLDPE). Specifically, since the main chain of ethylene propylene diene rubber (EPDM) is made of chemically stable saturated hydrocarbon, it has excellent aging resistance and chemical resistance, and has physical and mechanical properties such as high ductility, strong impact resistance, electrical insulation, low temperature resistance, low density, high filling, hot water resistance and water vapor resistance. Linear low density polyethylene (LLDPE) has high ductility and strong impact resistance, and is particularly excellent in environmental stress cleavage resistance, heat resistance and puncture resistance. In this embodiment, the rubber layer 200 is adopted as linear low density polyethylene (LLDPE). In another embodiment, the rubber layer 200 is adopted as ethylene propylene diene rubber (EPDM).

[0036] Referring to FIG. 1, according to some embodiments of the present application, the thin film support layer 100 preferably includes at least one of an insulating polymer material, an insulating polymer composite material, a conductive polymer material, and a conductive polymer composite material. The thin film support layer 100 has a pin puncture strength of 100 gf or more, an MD elongation strength of 200 MPa or more, and a TD elongation strength of 200 MPa or more. The MD elongation is 30% or more, and the TD elongation is 30% or more. Exemplarily, the thin film support layer 100 has a pin puncture strength of 150 gf, an MD elongation strength of 400 MPa, and a TD elongation strength of 400 MPa. The MD elongation is 120% and the TD elongation is 120%.

[0037] Specifically, the insulating polymer material includes at least one of polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene (PPE), polyvinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyparaphenylene terephthalamide (PPTA), polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), cellulose, starch, protein, derivatives thereof, crosslinked bodies thereof, and copolymers thereof.

[0038] The insulating polymer composite material described above may be a composite material made of an insulating polymer material and an inorganic material, where the inorganic material may be at least one of a ceramic material, a glass material, and a ceramic composite material.

[0039] The conductive polymer material may be at least one of doped polythiazyl and doped polyacetylene.

[0040] The conductive polymer composite material may be a composite material made of an insulating polymer material and a conductive material. Specifically, the conductive material may be at least one of a conductive carbon material, a metal material, and a composite conductive material. More specifically, the conductive carbon material is at least one selected from carbon black, carbon nanotubes, graphite, acetylene black, and graphene. The metal material is at least one selected from metallic nickel, metallic iron, metallic copper, metallic aluminum, or an alloy of the above metals. The composite conductive material is at least one selected from graphite powder coated with metallic nickel and carbon fiber coated with metallic nickel.

[0041] Referring to FIG. 1, according to some embodiments of the present application, the metal layer 300 is preferably an aluminum metal layer or a copper metal layer. Specifically, the purity of the metal layer 300 is 99.8% or more. That is, the metal layer 300 in the present application adopts a high-purity metal. In one embodiment, the metal layer 300 adopts an aluminum metal layer, and the purity of the aluminum metal layer is 99.8% or more. High-purity aluminum metal has properties such as low deformation resistance, high electrical conductivity, and good plasticity. In another embodiment, the metal layer 300 adopts a copper metal layer, and the purity of the copper metal layer is 99.8% or more. High-purity copper metal has good ductility, thermal conductivity, and electrical conductivity.

[0042] The peel strength between the metal layer 300 and the rubber layer 200 is 5 N / m or more. Exemplarily, the peel strength between the metal layer 300 and the rubber layer 200 is 10 N / m. The high peel strength between the metal layer 300 and the rubber layer 200 can reinforce the peel strength between the metal layer 300 and the thin film support layer 100, making it difficult for the metal layer 300 and the thin film support layer 100 to fall off, and further ensuring the electrical performance and safety of the battery.

[0043] Referring to FIG. 1, according to some embodiments of the present application, preferably, the thickness range of the thin film support layer 100 is 1 μm to 25 μm, and the thickness range of the metal layer 300 is 0.5 μm to 1.5 μm. The thickness range of the rubber layer 200 is 0.5 μm to 1 μm. The thickness range of the highly elastic composite current collector 10 according to the present application is 3 μm to 30 μm. Exemplarily, the thickness of the thin film support layer 100 is 10 μm, and the thickness of the metal layer 300 is 1 μm. The thickness range of the rubber layer 200 is 0.5 μm. The thickness of the highly elastic composite current collector 10 according to the present application is 13 μm.

[0044] Working Example The following examples are provided to more specifically describe the contents disclosed in the present invention, and these examples are provided for descriptive purposes only, and it is obvious to those skilled in the art that various modifications and changes may be made within the scope of the contents disclosed in the present invention. Unless otherwise specified, the parts, percentages and ratios described in the following examples are all based on weight, and all reagents used in the examples are all commercially available or can be synthesized by conventional methods, and can be used as is without the need for further processing. In addition, all equipment used in the examples are commercially available.

[0045] Referring to FIG. 2, Example 1 of the present application further provides a method for manufacturing the above-mentioned highly elastic composite current collector 10, which includes the following steps.

[0046] Step 1: Select materials for the 8 μm thin film support layer 100, the 99.9% pure metal aluminum layer, and the rubber layer 200. The thin film support layer 100 is made of polyparaphenylene terephthalamide (PPTA), and the rubber layer 200 is made of linear low density polyethylene (LLDPE).

[0047] Step 2: The material of the rubber layer 200 was melted.

[0048] Step 3: Melt linear low density polyethylene (LLDPE) was compounded on two opposite surfaces of the thin film support layer 100 by 3D printing, and a rubber layer 200 was formed on the two opposite surfaces of the thin film support layer 100. The rubber layer 200 not only improves the ductility and tensile strength of the product, but also plays a protective role for the thin film support layer 100.

[0049] However, the thickness of the rubber layer 200 was 0.5 μm.

[0050] Step 4: A metallic aluminum layer is deposited on the surface of the rubber layer 200. In this embodiment, the metallic aluminum layer has a thickness of 0.5 μm. Finally, a highly elastic composite current collector 10 having a thickness of 10 μm is manufactured. After the manufacture of the highly elastic composite current collector 10 is completed, the highly elastic composite current collector 10 is divided, wound and vacuum packed.

[0051] Example 2 The difference between this embodiment and the first embodiment is that the thickness of the thin film support layer 100 is 25 μm. The metal layer 300 has a thickness of 1.5 μm, and is a metallic copper layer. The thickness of the rubber layer 200 is 1 μm. Finally, a highly elastic composite current collector 10 having a thickness of 30 μm was manufactured.

[0052] Example 3 The difference between this embodiment and the first embodiment is that the thickness of the thin film support layer 100 is 1 μm. The metal layer 300 has a thickness of 0.5 μm, and is made of a metal aluminum layer. The thickness of the rubber layer 200 is 0.5 μm. Finally, a highly elastic composite current collector 10 having a thickness of 3 μm was manufactured.

[0053] Comparative Example Referring to FIG. 3, this comparative example provided a method for manufacturing a composite current collector 10, which includes the following steps.

[0054] Step 1: Select a thin film support layer 100 with a thickness of 8 μm and a metal aluminum layer with a purity of 99.9%, in which the thin film support layer 100 is made of polyparaphenylene terephthalamide (PPTA).

[0055] Step 2: The 8 μm thin film support layer 100 and the 99.9% pure aluminum metal layer are respectively placed in a vacuum deposition device, and the metal layer 300 is deposited on the two opposite surfaces of the thin film support layer 100. The process of depositing the metal layer 300 on the two opposite surfaces of the thin film support layer 100 is a multiple suspension vacuum deposition process. In this embodiment, the thickness of the metal layer 300 is 1 μm. Finally, a composite current collector 10 with a thickness of 10 μm is manufactured. After the manufacture of the composite current collector 10 is completed, the composite current collector 10 is divided, wound and vacuum packaged.

[0056] Comparative Example 2 The difference between this embodiment and the first embodiment is that the thickness of the thin film support layer 100 is 27 μm. The metal layer 300 has a thickness of 1.5 μm, and a metallic copper layer is used as the metal layer 300. Finally, a composite current collector 10 having a thickness of 30 μm was manufactured.

[0057] The stretch strength and elongation percentage of the composite current collectors 10 of Examples 1 to 3 and Comparative Examples 1 and 2 were measured, and the effect data shown in Table 1 was obtained.

[0058] [Table 1]

[0059] As can be seen from the above table, the stretch strength and elongation percentage of the composite current collector 10 according to the present application were both higher than those of the comparative composite current collector 10. As can be seen from this, the high stretch strength and elongation percentage of the composite current collector 10 according to the present application can effectively prevent the breakage phenomenon of the thin film support layer 100, improve the deformation resistance of the battery, and further ensure the safety of the battery.

[0060] As can be seen from the above table, the level of the stretching strength and elongation percentage of the composite current collector 10 was not related to the thickness of the composite current collector 10.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of simplicity, all possible combinations of the technical features in the above embodiments are not described, but as long as there is no contradiction in the combination of these technical features, they should all be considered within the scope of the present specification.

[0062] It should be understood that the above examples are merely illustrative of some embodiments of the present invention, and the description is specific and detailed, but does not limit the scope of the invention. It should be noted that those skilled in the art can make some modifications and improvements without departing from the concept of the present invention, and all of these fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention is based on the scope of the attached claims. [Explanation of symbols]

[0063] 10: composite current collector; 100: thin film support layer; 200: rubber layer; 300: metal layer.

Claims

1. A highly elastic composite current collector (10) including a thin film support layer (100) having a rubber layer (200) and a metal layer (300) sequentially provided on two opposite surfaces of the thin film support layer (100), The rubber layer (200) is bonded to two opposite surfaces of the thin film support layer (100), respectively. A highly elastic composite current collector.

2. The rubber layer (200) includes at least one of emulsion polymerization styrene butadiene rubber (ESBR), solution polymerization styrene butadiene rubber (SSBR), butadiene rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber (EPR), butyl rubber, and natural rubber (NR); 2. The highly elastic composite current collector according to claim 1.

3. The rubber layer (200) comprises ethylene propylene diene rubber (EPDM) or linear low density polyethylene (LLDPE); 2. The highly elastic composite current collector according to claim 1.

4. The thin film support layer (100) comprises at least one of an insulating polymeric material, an insulating polymeric composite material, a conductive polymeric material, and a conductive polymeric composite material; 2. The highly elastic composite current collector according to claim 1.

5. the insulating polymer material includes at least one of polyamide PA, polyterephthalate, polyimide PI, polyethylene PE, polypropylene PP, polystyrene PPE, polyvinyl chloride PVC, aramid, acrylonitrile-butadiene-styrene copolymer ABS, polybutylene terephthalate PET, polyparaphenylene terephthalamide PPTA, polypropylene PPE, polyoxymethylene POM, epoxy resin, phenolic resin, polytetrafluoroethylene PTEE, polyvinylidene fluoride PVDF, silicone rubber, polycarbonate PC, polyvinyl alcohol PVA, polyethylene glycol PEG, cellulose, starch, protein, derivatives thereof, crosslinked bodies thereof, and copolymers thereof; 5. The highly elastic composite current collector according to claim 4.

6. The metal layer (300) is a metallic aluminum layer or a metallic copper layer; 2. The highly elastic composite current collector according to claim 1.

7. The purity of the metal layer (300) is 99.8% or more; 2. The highly elastic composite current collector according to claim 1.

8. The thickness range of the thin film support layer (100) is 1 μm to 25 μm, and the thickness range of the metal layer (300) is 0.5 μm to 1.5 μm; 2. The highly elastic composite current collector according to claim 1.

9. The thickness range of the rubber layer (200) is 0.5 μm to 1 μm.

2. The highly elastic composite current collector according to claim 1.

10. A method for producing the highly elastic composite current collector according to any one of claims 2 to 9, comprising the steps of: Melting the material of the rubber layer (200); Compounding the molten material of the rubber layer (200) to the two opposing surfaces of the thin film support layer (100) by 3D printing to form the rubber layer (200) on the two opposing surfaces of the thin film support layer (100); and depositing the metal layer (300) on the surface of the rubber layer (200). A method for producing a highly elastic composite current collector.

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