WO2024000804A1 - High-weldability composite current collector and preparation method therefor - Google Patents

High-weldability composite current collector and preparation method therefor Download PDF

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Publication number
WO2024000804A1
WO2024000804A1 PCT/CN2022/116790 CN2022116790W WO2024000804A1 WO 2024000804 A1 WO2024000804 A1 WO 2024000804A1 CN 2022116790 W CN2022116790 W CN 2022116790W WO 2024000804 A1 WO2024000804 A1 WO 2024000804A1
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current collector
support layer
film support
composite current
composite
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PCT/CN2022/116790
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French (fr)
Chinese (zh)
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王成豪
李学法
张国平
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扬州纳力新材料科技有限公司
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Publication of WO2024000804A1 publication Critical patent/WO2024000804A1/en

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H01M4/662—Alloys
    • 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

Definitions

  • the present invention relates to the technical field of secondary batteries, and in particular to a composite current collector with high weldability and a preparation method thereof.
  • the current composite current collectors are mainly copper current collectors and aluminum current collectors.
  • the copper current collectors or aluminum current collectors are composed of two parts, including a thin film support layer in the middle and two opposite sides of the thin film support layer. metal coating on the surface.
  • the thickness of the metal coating is generally about 1 ⁇ m-2.5 ⁇ m, and the method of preparing the composite current collector is through the evaporation process. Since the thickness of the metal coating is only 1 ⁇ m-2.5 ⁇ m, the composite current collector with the metal coating is difficult to weld. During the process, weak welding and false welding are prone to occur, especially for aluminum current collectors. Due to the poor weldability of metal aluminum, the welding problems faced are more severe, which seriously restricts the batch use of aluminum current collectors.
  • a highly weldable composite current collector including:
  • Thin film support layer the two surfaces of the thin film support layer that are arranged opposite to each other are respectively provided with alloy plating layers;
  • the alloy coating includes uniformly mixed metal aluminum and metal nickel.
  • the alloy coating containing metal nickel has higher weldability, making the alloy coating with higher weldability After welding with the film support layer, it is relatively firmly combined, thereby effectively solving the problem of weak welding and weak welding during the welding process, and at the same time effectively ensuring the electrical performance and safety of the battery, and the composite current collector of this application is suitable It has a wide range and can be used in large quantities.
  • the ratio of the metal aluminum to the metal nickel is 1:0.2-0.5.
  • the purity of metal aluminum and metal nickel are both ⁇ 99.8%.
  • the thickness of the thin film support layer ranges from 1 ⁇ m to 25 ⁇ m, and the thickness of the alloy plating layer ranges from 1 ⁇ m to 2.5 ⁇ m.
  • the puncture strength of the film support layer is ⁇ 100gf
  • the MD tensile strength is ⁇ 200MPa
  • the TD tensile strength is ⁇ 200MPa
  • the MD elongation is ⁇ 30%
  • the TD elongation is ⁇ 30%.
  • the film support layer is made of at least one of an insulating polymer material, an insulating polymer composite material, a conductive polymer material, and a conductive polymer composite material.
  • the insulating polymer material includes polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene Ethylene (PPE), polyvinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyterephthalamide Phenylenediamine (PPTA), polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC) ), at least one of polyvinyl alcohol (PVA), polyethylene glycol (PEG), cellulose, starch, protein, their derivatives, their cross-linked products and their copolymers.
  • PA polyamide
  • PEG polyethylene glycol
  • PEG polyethylene glycol
  • starch protein
  • protein poly
  • the insulating polymer composite material is a composite material formed of the insulating polymer material and an inorganic material
  • the inorganic material includes at least one of ceramic materials, glass materials, and ceramic composite materials.
  • This application also provides a method for preparing a composite current collector with high weldability as described above, which includes the following steps:
  • the metal aluminum and the metal nickel are evaporated according to a ratio of 1:0.2-0.5 to form aluminum particles and nickel ions;
  • the aluminum particles and the nickel ions are transported in a direction close to the film support layer, and are attached to the two surfaces of the film support layer that are located opposite to each other, so that the two surfaces of the film support layer that are located opposite to each other are
  • the alloy plating layer is formed on the surface.
  • the heating and evaporation methods of the metal aluminum and the metal nickel include resistance heating, electron beam heating, radio frequency induction heating, arc heating and laser heating.
  • the alloy coating containing metallic nickel has higher weldability, making the weldability better.
  • the high alloy coating and the film support layer are relatively firmly combined after welding, thereby effectively solving the problem of weak welding and weak welding during the welding process, and at the same time effectively ensuring the electrical performance and safety of the battery, and the application
  • the composite current collector has a wide range of applications and can be used in large quantities; by setting the ratio of metal aluminum to metal nickel to 1:0.2-0.5, the electrical performance and safety of the battery can be effectively ensured, while the weldability of the alloy coating is ensured.
  • the content of metallic nickel should not be too high, otherwise it will affect the electrical performance of the battery; the content of metallic nickel should not be too low, otherwise the weldability of the alloy coating cannot be guaranteed.
  • Figure 1 is a schematic structural diagram of a highly weldable composite current collector shown in an embodiment of the present invention
  • Figure 2 is a schematic flowchart of the steps of a method for preparing a highly weldable composite current collector according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of the steps of a preparation method of a composite current collector shown in a pair of proportions of the present invention.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
  • connection In the present invention, unless otherwise clearly stated and limited, the terms “installation”, “connection”, “connection”, “fixing” and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
  • a first feature being “on” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch.
  • the terms “above”, “above” and “above” the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “below” and “beneath” the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.
  • one embodiment of the present invention provides a composite current collector 10 with high solderability, which includes a thin film support layer 100 .
  • Two opposite surfaces of the thin film support layer 100 are respectively provided with alloy plating layers 200 .
  • the alloy coating 200 includes uniformly mixed metal aluminum and metal nickel. Since metal aluminum has low weldability, mixing metal nickel with better weldability and metal aluminum makes the alloy coating 200 have higher weldability, which effectively solves the problem of weak welding and weak welding during the welding process. problems while ensuring the electrical performance and safety of the battery.
  • the puncture strength of the highly weldable composite current collector 10 is ⁇ 50gf, the MD tensile strength is ⁇ 180MPa, the TD tensile strength is ⁇ 180MPa, the MD elongation is ⁇ 10%, and the TD elongation is ⁇ 10%.
  • the puncture strength of the highly weldable composite current collector 10 is 80 gf, the MD tensile strength is 260 MPa, and the TD tensile strength is 260 MPa.
  • the MD elongation is 60% and the TD elongation is 60%. It should be noted that: MD (Machine Direction, machine direction) refers to the longitudinal direction, and TD (Transverse Direction, perpendicular to the machine direction) refers to the transverse direction.
  • the ratio of metal aluminum to metal nickel is 1:0.2-0.5.
  • the materials of the alloy plating layer 200 are metal aluminum and metal nickel, and the ratio of metal aluminum to metal nickel in the alloy plating layer 200 is 1:0.2-0.5. That is to say, the content of metallic aluminum is higher than that of metallic nickel, which can effectively ensure the electrical performance and safety of the battery and at the same time ensure the weldability of the alloy coating 200 .
  • the ratio of metallic aluminum to metallic nickel is not limited in this application and can be selected between 1:0.2-0.5. What needs to be understood is that the content of metallic nickel should not be too high, otherwise it will affect the electrical performance of the battery. The content of metallic nickel should not be too low, otherwise the weldability of alloy coating 200 cannot be guaranteed.
  • the purity of both metal aluminum and metal nickel is ⁇ 99.8%. That is to say, the metal aluminum and metal nickel used in this application are high-purity metal aluminum and high-purity metal nickel.
  • high-purity metallic nickel has excellent corrosion resistance, good weldability and electromagnetic control properties.
  • the high-purity metallic aluminum layer has low deformation resistance, high electrical conductivity and good plasticity.
  • the peeling force between the alloy coating 200 and the film support layer 100 is ⁇ 5N/m.
  • the peeling force between the alloy plating layer 200 and the film support layer 100 is 10 N/m.
  • the peeling force between the alloy coating 200 and the film support layer 100 is relatively high, which can prevent the alloy coating 200 and the film support layer 100 from falling off easily, thereby ensuring the electrical performance and safety of the battery.
  • the thickness of the film support layer 100 ranges from 1 ⁇ m to 25 ⁇ m, and the thickness of the alloy plating layer 200 ranges from 1 ⁇ m to 2.5 ⁇ m. It should be understood that the thickness of the composite current collector 10 with high weldability of the present application ranges from 3 ⁇ m to 30 ⁇ m.
  • the thickness of the thin film support layer 100 is not limited in this application, and can be selected between 1 ⁇ m and 25 ⁇ m.
  • the thickness of the alloy plating layer 200 is not limited in this application and can be selected between 1 ⁇ m and 2.5 ⁇ m.
  • the thickness of the thin film support layer 100 is 20 ⁇ m, and the thickness of the alloy plating layer 200 is 2 ⁇ m.
  • the puncture strength of the film support layer 100 is ⁇ 100gf, the MD tensile strength is ⁇ 200MPa, the TD tensile strength is ⁇ 200MPa, the MD elongation is ⁇ 30%, and the TD elongation Rate ⁇ 30%.
  • the puncture strength of the film support layer 100 is ⁇ 200f, the MD tensile strength is ⁇ 300MPa, the TD tensile strength is ⁇ 300MPa, the MD elongation is ⁇ 50%, and the TD elongation is ⁇ 50%.
  • the lower limit of the puncture strength of the film support layer 100 shall not be less than 100gf
  • the lower limit of the MD tensile strength shall not be less than 200MPa
  • the lower limit of the TD tensile strength shall not be less than 200MPa
  • the lower limit of the MD elongation shall not be less than 30%
  • the TD elongation shall not be less than 30%.
  • the lower limit of the rate shall not be less than 30%, otherwise it will affect the mechanical properties of the film support layer 100, and ultimately affect the puncture strength, MD tensile strength, TD tensile strength, MD elongation, TD of the highly weldable composite current collector 10 elongation.
  • the material of the film support layer 100 includes at least one of insulating polymer materials, insulating polymer composite materials, conductive polymer materials, and conductive polymer composite materials. .
  • insulating polymer materials include polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene (PPE), polyethylene Vinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyphenylene terephthalamide (PPTA) , polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC), polyvinyl alcohol ( At least one of PVA), polyethylene glycol (PEG), cellulose, starch, protein, their derivatives, their cross-linked products and their copolymers.
  • PA polyamide
  • PEG polyethylene glycol
  • PEG polyethylene glycol
  • starch protein
  • protein their derivatives, their cross-linked products and
  • the above-mentioned insulating polymer composite material is a composite material formed of an insulating polymer material and an inorganic material.
  • the inorganic material includes at least one of ceramic materials, glass materials, and ceramic composite materials.
  • the above-mentioned conductive polymer material may be at least one of doped polysulfide nitride and doped polyacetylene.
  • the above-mentioned conductive polymer composite material may be a composite material formed of an insulating polymer material and a conductive material.
  • the conductive material may be at least one of conductive carbon materials, metal materials, and composite conductive materials. More specifically, the conductive carbon material is selected from at least one of carbon black, carbon nanotubes, graphite, acetylene black, and graphene.
  • the metal material is selected from at least one of metal nickel, metal iron, metal copper, metal aluminum or alloys of the above metals.
  • the composite conductive material is selected from at least one of metal nickel-coated graphite powder and metal nickel-coated carbon fiber.
  • one embodiment of the present invention also provides a method for preparing a highly weldable composite current collector 10, which includes the following steps:
  • Step 1 Evaporate metallic aluminum and metallic nickel at a ratio of 1:0.2-0.5 to form aluminum particles and nickel ions.
  • Step 2 The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
  • the process of heating and evaporating metal aluminum and metal nickel is performed in a vacuum environment to prevent impurities from being doped into aluminum particles and nickel ions.
  • the process of forming the alloy plating layer 200 on the two opposite surfaces of the film support layer 100 is also performed in a vacuum environment to prevent impurities from being doped into the alloy plating layer 200 .
  • methods for heating and evaporating metal aluminum and metal nickel include resistance heating, electron beam heating, radio frequency induction heating, arc heating, and laser heating.
  • This application does not limit the heating and evaporation methods of metal aluminum and metal nickel, which can be set according to the use requirements.
  • metal aluminum and metal nickel are heated and evaporated by arc heating.
  • Step 1 Evaporate metallic aluminum and metallic nickel at a ratio of 1:0.5 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
  • Step 2 The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
  • the film support layer 100 is made of polybutylene terephthalate (PET).
  • PET polybutylene terephthalate
  • the thickness of the film support layer 100 is 6 ⁇ m, and the thickness of the alloy coating 200 is in the range of 1 ⁇ m.
  • an 8 ⁇ m composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
  • Step 1 Evaporate metal aluminum and metal nickel at a ratio of 1:0.35 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
  • Step 2 The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
  • the film support layer 100 is made of polybutylene terephthalate (PET).
  • PET polybutylene terephthalate
  • the thickness of the thin film support layer 100 is 1 ⁇ m, and the thickness of the alloy coating 200 ranges from 1 ⁇ m.
  • a 3 ⁇ m composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
  • Step 1 Evaporate metal aluminum and metal nickel at a ratio of 1:0.2 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
  • Step 2 The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
  • the film support layer 100 is made of polybutylene terephthalate (PET).
  • PET polybutylene terephthalate
  • the thickness of the film support layer 100 is 25 ⁇ m, and the thickness of the alloy coating 200 ranges from 2.5 ⁇ m.
  • a 30 ⁇ m composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
  • the preparation method of the composite current collector 10 provided in this comparative example includes the following steps:
  • Step 1 Select a 6 ⁇ m film support layer 100 and 99.9% pure aluminum metal.
  • the film support layer 100 is made of polybutylene terephthalate (PET).
  • Step 2 Put the 6 ⁇ m thin film support layer 100 and the 99.9% purity metal aluminum into the vacuum coating equipment respectively, and evaporate the metal aluminum layers on the two opposite surfaces of the thin film support layer 100 to obtain the required composite.
  • the thickness of the metallic aluminum layer is 1 ⁇ m.
  • the preparation method of the composite current collector 10 provided in this comparative example includes the following steps:
  • Step 1 Select a 25 ⁇ m film support layer 100 and 99.9% pure aluminum metal.
  • the film support layer 100 is made of polybutylene terephthalate (PET).
  • Step 2 Put the 25 ⁇ m thin film support layer 100 and the 99.9% purity metal aluminum into the vacuum coating equipment respectively, and evaporate the metal aluminum layers on the two opposite surfaces of the thin film support layer 100 to obtain the required composite.
  • the thickness of the metallic aluminum layer is 2.5 ⁇ m.
  • the welding tensile force of the composite current collector 10 of Examples 1-3 and Comparative Examples 1-2 was tested, and the effect data as shown in Table 1 was obtained. It should be understood that the welding tension of the composite current collector 10 refers to the welding tension between the film support layer 100 and the alloy coating 200, and between the film support layer 100 and the metal aluminum layer.
  • Table 1 shows the welding tensile test data of composite current collector 10.
  • Example 1 40 Example 2 36 Example 3 32 Comparative example 1 15 Comparative example 2 15
  • the welding pulling force of the composite current collector 10 with high weldability of the present invention is greater than the welding pulling force of the composite current collector 10 of the comparative example, and the welding pulling force of the composite current collector 10 is related to the thickness and alloy of the film support layer 100
  • the thickness of the coating 200 has nothing to do with the thickness of the metal aluminum layer, but is only related to the content of metal nickel. The higher the content of metal nickel, the greater the welding pulling force of the composite current collector 10 .

Abstract

The present invention relates to a high-weldability composite current collector and a preparation method therefor. The high-weldability composite current collector comprises a thin film support layer, and alloy coating layers disposed on each of two opposite surfaces of the thin film support layer, an alloy coating layer comprising uniformly mixed metallic aluminum and metallic nickel. The present invention, by means of mixing metallic aluminum and metallic nickel, causes an alloy coating layer containing metallic nickel to have high weldability due to the excellent corrosion resistance and good weldability of metallic nickel, and causes the alloy coating layer having high weldability to be firmly welded to the thin film support layer, thereby effectively solving the problems of weak welding and false welding in a welding process, while also effectively ensuring the electrical performance and safety of a battery. In addition, the composite current collector of the present application has a wide application range and can be used in large quantities.

Description

高可焊性的复合集流体及其制备方法Highly weldable composite current collector and preparation method thereof 技术领域Technical field
本发明涉及二次电池技术领域，特别是涉及一种高可焊性的复合集流体及其制备方法。The present invention relates to the technical field of secondary batteries, and in particular to a composite current collector with high weldability and a preparation method thereof.
背景技术Background technique
目前的复合集流体主要为铜集流体和铝集流体两种，其中铜集流体或者铝集流体均由两部分构成，包含设置于中间的薄膜支撑层和设置于薄膜支撑层相背设置的两个表面的金属镀层。金属镀层的厚度要求一般为1μm-2.5μm左右，且制备复合集流体的方式是通过蒸镀工艺完成，由于金属镀层的厚度仅只有1μm-2.5μm，导致设置有金属镀层的复合集流体在焊接过程中容易出现焊接不牢固以及虚焊的现象发生，特别是对于铝集流体，由于金属铝的可焊性比较差，所面临的焊接问题更加严峻，严重制约了铝集流体的批量使用。The current composite current collectors are mainly copper current collectors and aluminum current collectors. The copper current collectors or aluminum current collectors are composed of two parts, including a thin film support layer in the middle and two opposite sides of the thin film support layer. metal coating on the surface. The thickness of the metal coating is generally about 1 μm-2.5 μm, and the method of preparing the composite current collector is through the evaporation process. Since the thickness of the metal coating is only 1 μm-2.5 μm, the composite current collector with the metal coating is difficult to weld. During the process, weak welding and false welding are prone to occur, especially for aluminum current collectors. Due to the poor weldability of metal aluminum, the welding problems faced are more severe, which seriously restricts the batch use of aluminum current collectors.
发明内容Contents of the invention
基于此，有必要提供一种能够有效解决在焊接过程中出现焊接不牢固、虚焊的问题，且适用范围较广，可大批量的使用的高可焊性的复合集流体及其制备方法。Based on this, it is necessary to provide a composite current collector with high weldability that can effectively solve the problems of weak welding and weak welding during the welding process, has a wide application range, and can be used in large quantities, and a preparation method thereof.
一种高可焊性的复合集流体，包括：A highly weldable composite current collector including:
薄膜支撑层，所述薄膜支撑层相背设置的两个表面上分别设置有合金镀层；Thin film support layer, the two surfaces of the thin film support layer that are arranged opposite to each other are respectively provided with alloy plating layers;
其中，所述合金镀层包括均匀混合的金属铝及金属镍。Wherein, the alloy coating includes uniformly mixed metal aluminum and metal nickel.
通过将金属铝及金属镍混合，由于金属镍具有优良的耐蚀性及较好的可焊 性，使得含有金属镍的合金镀层具有较高的可焊性，使得可焊性较高的合金镀层与薄膜支撑层焊接后较为牢固地结合在一起，从而有效解决在焊接过程中出现焊接不牢固、虚焊的问题，同时可有效保证电池的电性能及安全性，且本申请的复合集流体适用范围较广，可大批量的使用。By mixing metal aluminum and metal nickel, because metal nickel has excellent corrosion resistance and good weldability, the alloy coating containing metal nickel has higher weldability, making the alloy coating with higher weldability After welding with the film support layer, it is relatively firmly combined, thereby effectively solving the problem of weak welding and weak welding during the welding process, and at the same time effectively ensuring the electrical performance and safety of the battery, and the composite current collector of this application is suitable It has a wide range and can be used in large quantities.
在其中一个实施例中，所述金属铝与所述金属镍的比例为1：0.2-0.5。In one embodiment, the ratio of the metal aluminum to the metal nickel is 1:0.2-0.5.
在其中一个实施例中，金属铝及金属镍的纯度均≥99.8％。In one embodiment, the purity of metal aluminum and metal nickel are both ≥99.8%.
在其中一个实施例中，所述薄膜支撑层的厚度范围为1μm-25μm，所述合金镀层的厚度范围为1μm-2.5μm。In one embodiment, the thickness of the thin film support layer ranges from 1 μm to 25 μm, and the thickness of the alloy plating layer ranges from 1 μm to 2.5 μm.
在其中一个实施例中，所述薄膜支撑层的穿刺强度≥100gf，MD拉伸强度≥200MPa,TD拉伸强度≥200MPa，MD延伸率≥30％,TD延伸率≥30％。In one embodiment, the puncture strength of the film support layer is ≥100gf, the MD tensile strength is ≥200MPa, the TD tensile strength is ≥200MPa, the MD elongation is ≥30%, and the TD elongation is ≥30%.
在其中一个实施例中，所述薄膜支撑层的材质包括绝缘高分子材料、绝缘高分子复合材料、导电高分子材料、导电高分子复合材料中的至少一种。In one embodiment, the film support layer is made of at least one of an insulating polymer material, an insulating polymer composite material, a conductive polymer material, and a conductive polymer composite material.
在其中一个实施例中，所述绝缘高分子材料包括聚酰胺(PA)、聚对苯二甲酸酯、聚酰亚胺(PI)、聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PPE)、聚氯乙烯(PVC)、芳纶、丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚对苯二甲酸丁二醇酯(PET)、聚对苯二甲酰对苯二胺(PPTA)、聚丙乙烯(PPE)、聚甲醛(POM)、环氧树脂、酚醛树脂、聚四氟乙烯(PTEE)、聚偏氟乙烯(PVDF)、硅橡胶、聚碳酸酯(PC)、聚乙烯醇(PVA)、聚乙二醇(PEG)、纤维素、淀粉、蛋白质、它们的衍生物、它们的交联物及它们的共聚物中的至少一种。In one embodiment, the insulating polymer material includes polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene Ethylene (PPE), polyvinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyterephthalamide Phenylenediamine (PPTA), polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC) ), at least one of polyvinyl alcohol (PVA), polyethylene glycol (PEG), cellulose, starch, protein, their derivatives, their cross-linked products and their copolymers.
在其中一个实施例中，所述绝缘高分子复合材料为所述绝缘高分子材料与无机材料形成的复合材料；In one embodiment, the insulating polymer composite material is a composite material formed of the insulating polymer material and an inorganic material;
其中，所述无机材料包括陶瓷材料、玻璃材料、陶瓷复合材料中的至少一种。Wherein, the inorganic material includes at least one of ceramic materials, glass materials, and ceramic composite materials.
本申请还提供了一种如上所述的高可焊性的复合集流体的制备方法，包括以下步骤：This application also provides a method for preparing a composite current collector with high weldability as described above, which includes the following steps:
将所述金属铝及所述金属镍按照1：0.2-0.5的比例进行蒸发，以形成铝粒子及镍离子；The metal aluminum and the metal nickel are evaporated according to a ratio of 1:0.2-0.5 to form aluminum particles and nickel ions;
所述铝粒子及所述镍离子沿靠近所述薄膜支撑层的方向进行输送，并附着于所述薄膜支撑层相背设置的两个表面，以在所述薄膜支撑层相背设置的两个表面上形成所述合金镀层。The aluminum particles and the nickel ions are transported in a direction close to the film support layer, and are attached to the two surfaces of the film support layer that are located opposite to each other, so that the two surfaces of the film support layer that are located opposite to each other are The alloy plating layer is formed on the surface.
在其中一个实施例中，将所述金属铝及所述金属镍进行加热蒸发的方式包括电阻加热、电子束加热、射频感应加热、电弧加热及激光加热。In one embodiment, the heating and evaporation methods of the metal aluminum and the metal nickel include resistance heating, electron beam heating, radio frequency induction heating, arc heating and laser heating.
上述方案中，通过将金属铝及金属镍混合，由于金属镍具有优良的耐蚀性及较好的可焊性，使得含有金属镍的合金镀层具有较高的可焊性，使得可焊性较高的合金镀层与薄膜支撑层焊接后较为牢固地结合在一起，从而有效解决在焊接过程中出现焊接不牢固、虚焊的问题，同时可有效保证电池的电性能及安全性，且本申请的复合集流体适用范围较广，可大批量的使用；通过将金属铝与金属镍的比例设置为1：0.2-0.5，可有效保证电池的电性能及安全性，同时保证合金镀层的可焊性，金属镍的含量不宜过高，否则会影响电池的电性能；金属镍的含量也不宜过低，否则无法保证合金镀层的可焊性。In the above solution, by mixing metallic aluminum and metallic nickel, because metallic nickel has excellent corrosion resistance and better weldability, the alloy coating containing metallic nickel has higher weldability, making the weldability better. The high alloy coating and the film support layer are relatively firmly combined after welding, thereby effectively solving the problem of weak welding and weak welding during the welding process, and at the same time effectively ensuring the electrical performance and safety of the battery, and the application The composite current collector has a wide range of applications and can be used in large quantities; by setting the ratio of metal aluminum to metal nickel to 1:0.2-0.5, the electrical performance and safety of the battery can be effectively ensured, while the weldability of the alloy coating is ensured. , the content of metallic nickel should not be too high, otherwise it will affect the electrical performance of the battery; the content of metallic nickel should not be too low, otherwise the weldability of the alloy coating cannot be guaranteed.
附图说明Description of drawings
构成本申请的一部分的附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。The drawings forming a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明 的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.
图1为本发明一实施例所示的高可焊性的复合集流体的结构示意图；Figure 1 is a schematic structural diagram of a highly weldable composite current collector shown in an embodiment of the present invention;
图2为本发明一实施例所示的高可焊性的复合集流体的制备方法的步骤流程示意图；Figure 2 is a schematic flowchart of the steps of a method for preparing a highly weldable composite current collector according to an embodiment of the present invention;
图3为本发明一对比例所示的复合集流体的制备方法的步骤流程示意图。FIG. 3 is a schematic flowchart of the steps of a preparation method of a composite current collector shown in a pair of proportions of the present invention.
附图标记说明Explanation of reference signs
10、复合集流体；100、薄膜支撑层；200、合金镀层。10. Composite current collector; 100. Thin film support layer; 200. Alloy coating.
具体实施方式Detailed ways
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本发明。但是本发明能够以很多不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本发明内涵的情况下做类似改进，因此本发明不受下面公开的具体实施例的限制。In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗 示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。It should be noted that when an element is referred to as being "mounted" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.
请参阅图1，本发明的一实施例提供了一种高可焊性的复合集流体10，包括薄膜支撑层100，薄膜支撑层100相背设置的两个表面上分别设置有合金镀层200。其中，合金镀层200包括均匀混合的金属铝及金属镍。由于金属铝的可焊 性较低，因此，将可焊性较好的金属镍与金属铝混合使得合金镀层200具有较高的可焊性，有效解决在焊接过程中出现焊接不牢固、虚焊的问题，且同时保证了电池的电性能及安全性。Referring to FIG. 1 , one embodiment of the present invention provides a composite current collector 10 with high solderability, which includes a thin film support layer 100 . Two opposite surfaces of the thin film support layer 100 are respectively provided with alloy plating layers 200 . The alloy coating 200 includes uniformly mixed metal aluminum and metal nickel. Since metal aluminum has low weldability, mixing metal nickel with better weldability and metal aluminum makes the alloy coating 200 have higher weldability, which effectively solves the problem of weak welding and weak welding during the welding process. problems while ensuring the electrical performance and safety of the battery.
高可焊性的复合集流体10的穿刺强度≥50gf，MD拉伸强度≥180MPa，TD拉伸强度≥180MPa，MD延伸率≥10％，TD延伸率≥10％。示例性地高可焊性的复合集流体10的穿刺强度为80gf，MD拉伸强度为260MPa，TD拉伸强度为260MPa。MD延伸率为60％，TD延伸率为60％。需要说明的是：MD(Machine Direction，机械方向)是指纵向，TD(Transverse Direction，垂直于机械方向)是指横向。The puncture strength of the highly weldable composite current collector 10 is ≥50gf, the MD tensile strength is ≥180MPa, the TD tensile strength is ≥180MPa, the MD elongation is ≥10%, and the TD elongation is ≥10%. Exemplarily, the puncture strength of the highly weldable composite current collector 10 is 80 gf, the MD tensile strength is 260 MPa, and the TD tensile strength is 260 MPa. The MD elongation is 60% and the TD elongation is 60%. It should be noted that: MD (Machine Direction, machine direction) refers to the longitudinal direction, and TD (Transverse Direction, perpendicular to the machine direction) refers to the transverse direction.
请参阅图1，根据本申请的一些实施例，可选地，金属铝与金属镍的比例为1：0.2-0.5。具体地，合金镀层200的材料为金属铝与金属镍，且合金镀层200的金属铝与金属镍的比例为1：0.2-0.5。也就是说，金属铝的含量高于金属镍的含量，可有效保证电池的电性能及安全性，同时保证合金镀层200的可焊性。Please refer to Figure 1. According to some embodiments of the present application, optionally, the ratio of metal aluminum to metal nickel is 1:0.2-0.5. Specifically, the materials of the alloy plating layer 200 are metal aluminum and metal nickel, and the ratio of metal aluminum to metal nickel in the alloy plating layer 200 is 1:0.2-0.5. That is to say, the content of metallic aluminum is higher than that of metallic nickel, which can effectively ensure the electrical performance and safety of the battery and at the same time ensure the weldability of the alloy coating 200 .
对于金属铝与金属镍的比例，本申请不做限制，可在1：0.2-0.5之间选取。需要理解的是：金属镍的含量不宜过高，否则会影响电池的电性能。金属镍的含量也不宜过低，否则无法保证合金镀层200的可焊性。The ratio of metallic aluminum to metallic nickel is not limited in this application and can be selected between 1:0.2-0.5. What needs to be understood is that the content of metallic nickel should not be too high, otherwise it will affect the electrical performance of the battery. The content of metallic nickel should not be too low, otherwise the weldability of alloy coating 200 cannot be guaranteed.
请参阅图1，根据本申请的一些实施例，可选地，金属铝及金属镍的纯度均≥99.8％。也就是说，在本申请中的金属铝及金属镍采用的是高纯度的金属铝及高纯度的金属镍。具体地，高纯度的金属镍具有优良的耐蚀性、较好的可焊性及电磁控制性能。高纯度的金属铝层具有低的变形抗力、高的电导率及良好的塑性等性能。通过采用高纯度的金属镍及高纯度的金属铝，进一步地提高了合金镀层200的可焊性。Please refer to Figure 1. According to some embodiments of the present application, optionally, the purity of both metal aluminum and metal nickel is ≥99.8%. That is to say, the metal aluminum and metal nickel used in this application are high-purity metal aluminum and high-purity metal nickel. Specifically, high-purity metallic nickel has excellent corrosion resistance, good weldability and electromagnetic control properties. The high-purity metallic aluminum layer has low deformation resistance, high electrical conductivity and good plasticity. By using high-purity metal nickel and high-purity metal aluminum, the weldability of the alloy coating 200 is further improved.
合金镀层200与薄膜支撑层100之间的剥离力≥5N/m。示例性地，合金镀 层200与薄膜支撑层100之间的剥离力为10N/m。合金镀层200与薄膜支撑层100之间的剥离力较高，能够使得合金镀层200与薄膜支撑层100之间不易发生脱落的现象，从而保证电池的电性能及安全性。The peeling force between the alloy coating 200 and the film support layer 100 is ≥5N/m. For example, the peeling force between the alloy plating layer 200 and the film support layer 100 is 10 N/m. The peeling force between the alloy coating 200 and the film support layer 100 is relatively high, which can prevent the alloy coating 200 and the film support layer 100 from falling off easily, thereby ensuring the electrical performance and safety of the battery.
请参阅图1，根据本申请的一些实施例，可选地，薄膜支撑层100的厚度范围为1μm-25μm，合金镀层200的厚度范围为1μm-2.5μm。需要理解的是：本申请的高可焊性的复合集流体10的厚度范围为3μm-30μm。对于薄膜支撑层100的厚度本申请不做限制，可在1μm-25μm之间选取。对于合金镀层200的厚度本申请不做限制，可在1μm-2.5μm之间选取。示例性地，薄膜支撑层100的厚度为20μm，合金镀层200的厚度为2μm。Referring to Figure 1, according to some embodiments of the present application, optionally, the thickness of the film support layer 100 ranges from 1 μm to 25 μm, and the thickness of the alloy plating layer 200 ranges from 1 μm to 2.5 μm. It should be understood that the thickness of the composite current collector 10 with high weldability of the present application ranges from 3 μm to 30 μm. The thickness of the thin film support layer 100 is not limited in this application, and can be selected between 1 μm and 25 μm. The thickness of the alloy plating layer 200 is not limited in this application and can be selected between 1 μm and 2.5 μm. For example, the thickness of the thin film support layer 100 is 20 μm, and the thickness of the alloy plating layer 200 is 2 μm.
请参阅图1，根据本申请的一些实施例，可选地，薄膜支撑层100的穿刺强度≥100gf，MD拉伸强度≥200MPa,TD拉伸强度≥200MPa，MD延伸率≥30％,TD延伸率≥30％。示例性地，薄膜支撑层100的穿刺强度≥200f，MD拉伸强度≥300MPa,TD拉伸强度≥300MPa，MD延伸率≥50％,TD延伸率≥50％。Please refer to Figure 1. According to some embodiments of the present application, optionally, the puncture strength of the film support layer 100 is ≥100gf, the MD tensile strength is ≥200MPa, the TD tensile strength is ≥200MPa, the MD elongation is ≥30%, and the TD elongation Rate ≥ 30%. For example, the puncture strength of the film support layer 100 is ≥200f, the MD tensile strength is ≥300MPa, the TD tensile strength is ≥300MPa, the MD elongation is ≥50%, and the TD elongation is ≥50%.
需要说明的是：对于薄膜支撑层100的穿刺强度、MD拉伸强度、TD拉伸强度、MD延伸率、TD延伸率的上限本申请不做限制，可根据使用需要自行设定。对于薄膜支撑层100的穿刺强度的下限不得低于100gf，MD拉伸强度的下限不得低于200MPa，TD拉伸强度的下限不得低于200MPa，MD延伸率的下限不得低于30％，TD延伸率的下限不得低于30％，否则会影响薄膜支撑层100的力学性能，最终影响高可焊性的复合集流体10的穿刺强度、MD拉伸强度、TD拉伸强度、MD延伸率、TD延伸率。It should be noted that there is no upper limit on the puncture strength, MD tensile strength, TD tensile strength, MD elongation, and TD elongation of the film support layer 100 in this application, and they can be set according to the needs of use. The lower limit of the puncture strength of the film support layer 100 shall not be less than 100gf, the lower limit of the MD tensile strength shall not be less than 200MPa, the lower limit of the TD tensile strength shall not be less than 200MPa, the lower limit of the MD elongation shall not be less than 30%, and the TD elongation shall not be less than 30%. The lower limit of the rate shall not be less than 30%, otherwise it will affect the mechanical properties of the film support layer 100, and ultimately affect the puncture strength, MD tensile strength, TD tensile strength, MD elongation, TD of the highly weldable composite current collector 10 elongation.
请参阅图1，根据本申请的一些实施例，可选地，薄膜支撑层100的材质包括绝缘高分子材料、绝缘高分子复合材料、导电高分子材料、导电高分子复合材料中的至少一种。Please refer to Figure 1. According to some embodiments of the present application, optionally, the material of the film support layer 100 includes at least one of insulating polymer materials, insulating polymer composite materials, conductive polymer materials, and conductive polymer composite materials. .
具体地，绝缘高分子材料包括聚酰胺(PA)、聚对苯二甲酸酯、聚酰亚胺(PI)、聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PPE)、聚氯乙烯(PVC)、芳纶、丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚对苯二甲酸丁二醇酯(PET)、聚对苯二甲酰对苯二胺(PPTA)、聚丙乙烯(PPE)、聚甲醛(POM)、环氧树脂、酚醛树脂、聚四氟乙烯(PTEE)、聚偏氟乙烯(PVDF)、硅橡胶、聚碳酸酯(PC)、聚乙烯醇(PVA)、聚乙二醇(PEG)、纤维素、淀粉、蛋白质、它们的衍生物、它们的交联物及它们的共聚物中的至少一种。Specifically, insulating polymer materials include polyamide (PA), polyterephthalate, polyimide (PI), polyethylene (PE), polypropylene (PP), polystyrene (PPE), polyethylene Vinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate (PET), polyphenylene terephthalamide (PPTA) , polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride (PVDF), silicone rubber, polycarbonate (PC), polyvinyl alcohol ( At least one of PVA), polyethylene glycol (PEG), cellulose, starch, protein, their derivatives, their cross-linked products and their copolymers.
上述的绝缘高分子复合材料为绝缘高分子材料与无机材料形成的复合材料。其中，无机材料包括陶瓷材料、玻璃材料、陶瓷复合材料中的至少一种。The above-mentioned insulating polymer composite material is a composite material formed of an insulating polymer material and an inorganic material. Wherein, the inorganic material includes at least one of ceramic materials, glass materials, and ceramic composite materials.
上述的导电高分子材料可以是经掺杂的聚氮化硫、经掺杂的聚乙炔中的至少一种。The above-mentioned conductive polymer material may be at least one of doped polysulfide nitride and doped polyacetylene.
上述的导电高分子复合材料，可以是绝缘高分子材料与导电材料形成的复合材料。具体地，导电材料可以是导电碳材料、金属材料、复合导电材料中的至少一种。更具体地，导电碳材料选自碳黑、碳纳米管、石墨、乙炔黑、石墨烯中的至少一种。金属材料选自金属镍、金属铁、金属铜、金属铝或上述金属的合金中的至少一种。复合导电材料选自金属镍包覆的石墨粉、金属镍包覆的碳纤维中的至少一种。The above-mentioned conductive polymer composite material may be a composite material formed of an insulating polymer material and a conductive material. Specifically, the conductive material may be at least one of conductive carbon materials, metal materials, and composite conductive materials. More specifically, the conductive carbon material is selected from at least one of carbon black, carbon nanotubes, graphite, acetylene black, and graphene. The metal material is selected from at least one of metal nickel, metal iron, metal copper, metal aluminum or alloys of the above metals. The composite conductive material is selected from at least one of metal nickel-coated graphite powder and metal nickel-coated carbon fiber.
请参阅图2，本发明的一实施例还提供了一种高可焊性的复合集流体10的制备方法，包括以下步骤：Referring to Figure 2, one embodiment of the present invention also provides a method for preparing a highly weldable composite current collector 10, which includes the following steps:
步骤1：将金属铝及金属镍按照1：0.2-0.5的比例进行蒸发，以形成铝粒子及镍离子。Step 1: Evaporate metallic aluminum and metallic nickel at a ratio of 1:0.2-0.5 to form aluminum particles and nickel ions.
步骤2：铝粒子及镍离子沿靠近薄膜支撑层100的方向进行输送，并附着于薄膜支撑层100相背设置的两个表面，以在薄膜支撑层100相背设置的两个表 面上形成合金镀层200。Step 2: The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
具体地，将金属铝及金属镍加热蒸发的过程在真空环境下进行，以防止杂质掺杂于铝粒子及镍离子中。在薄膜支撑层100相背设置的两个表面上形成合金镀层200的过程也在真空环境下进行，以防止杂质掺杂于合金镀层200中。Specifically, the process of heating and evaporating metal aluminum and metal nickel is performed in a vacuum environment to prevent impurities from being doped into aluminum particles and nickel ions. The process of forming the alloy plating layer 200 on the two opposite surfaces of the film support layer 100 is also performed in a vacuum environment to prevent impurities from being doped into the alloy plating layer 200 .
请参阅图1，根据本申请的一些实施例，可选地，将金属铝及金属镍进行加热蒸发的方式包括电阻加热、电子束加热、射频感应加热、电弧加热及激光加热。本申请对于金属铝及金属镍进行加热蒸发的方式不做限制，可根据使用需求自行设定。示例性地，将金属铝及金属镍进行加热蒸发的方式电弧加热。Referring to Figure 1, according to some embodiments of the present application, optionally, methods for heating and evaporating metal aluminum and metal nickel include resistance heating, electron beam heating, radio frequency induction heating, arc heating, and laser heating. This application does not limit the heating and evaporation methods of metal aluminum and metal nickel, which can be set according to the use requirements. For example, metal aluminum and metal nickel are heated and evaporated by arc heating.
实施例：Example:
下述实施例更具体地描述了本发明公开的内容，这些实施例仅仅用于阐述性说明，因为在本发明公开内容的范围内进行各种修改和变化对本领域技术人员来说是明显的。除非另有声明，以下实施例中所报道的所有份、百分比、和比值都是基于重量计，而且实施例中使用的所有试剂都可商购获得或是按照常规方法进行合成获得，并且可直接使用而无需进一步处理，以及实施例中使用的仪器均可商购获得。The present disclosure is more particularly described in the following examples, which are intended to be illustrative only, as it will be apparent to those skilled in the art that various modifications and changes can be made within the scope of the present disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods, and can be directly were used without further processing and the equipment used in the examples is commercially available.
高可焊性的复合集流体10的制备方法Preparation method of composite current collector 10 with high weldability
实施例1：Example 1:
步骤1：将金属铝及金属镍按照1：0.5的比例进行蒸发，以形成铝粒子及镍离子。其中，金属铝及金属镍的纯度为99.9％。Step 1: Evaporate metallic aluminum and metallic nickel at a ratio of 1:0.5 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
步骤2：铝粒子及镍离子沿靠近薄膜支撑层100的方向进行输送，并附着于薄膜支撑层100相背设置的两个表面，以在薄膜支撑层100相背设置的两个表面上形成合金镀层200。Step 2: The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
其中，薄膜支撑层100采用聚对苯二甲酸丁二醇酯(PET)。薄膜支撑层100 的厚度为6μm，合金镀层200的厚度范围为1μm。最终制得8μm的高可焊性的复合集流体10，在制备完成后，对高可焊性的复合集流体10进行分切收卷以及真空包装作业。Among them, the film support layer 100 is made of polybutylene terephthalate (PET). The thickness of the film support layer 100 is 6 μm, and the thickness of the alloy coating 200 is in the range of 1 μm. Finally, an 8 μm composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
实施例2：Example 2:
步骤1：将金属铝及金属镍按照1：0.35的比例进行蒸发，以形成铝粒子及镍离子。其中，金属铝及金属镍的纯度为99.9％。Step 1: Evaporate metal aluminum and metal nickel at a ratio of 1:0.35 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
步骤2：铝粒子及镍离子沿靠近薄膜支撑层100的方向进行输送，并附着于薄膜支撑层100相背设置的两个表面，以在薄膜支撑层100相背设置的两个表面上形成合金镀层200。Step 2: The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
其中，薄膜支撑层100采用聚对苯二甲酸丁二醇酯(PET)。薄膜支撑层100的厚度为1μm，合金镀层200的厚度范围为1μm。最终制得3μm的高可焊性的复合集流体10，在制备完成后，对高可焊性的复合集流体10进行分切收卷以及真空包装作业。Among them, the film support layer 100 is made of polybutylene terephthalate (PET). The thickness of the thin film support layer 100 is 1 μm, and the thickness of the alloy coating 200 ranges from 1 μm. Finally, a 3 μm composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
实施例3：Example 3:
步骤1：将金属铝及金属镍按照1：0.2的比例进行蒸发，以形成铝粒子及镍离子。其中，金属铝及金属镍的纯度为99.9％。Step 1: Evaporate metal aluminum and metal nickel at a ratio of 1:0.2 to form aluminum particles and nickel ions. Among them, the purity of metal aluminum and metal nickel is 99.9%.
步骤2：铝粒子及镍离子沿靠近薄膜支撑层100的方向进行输送，并附着于薄膜支撑层100相背设置的两个表面，以在薄膜支撑层100相背设置的两个表面上形成合金镀层200。Step 2: The aluminum particles and nickel ions are transported in the direction close to the film support layer 100 and attached to the two opposite surfaces of the film support layer 100 to form an alloy on the two opposite surfaces of the film support layer 100 Plating 200.
其中，薄膜支撑层100采用聚对苯二甲酸丁二醇酯(PET)。薄膜支撑层100的厚度为25μm，合金镀层200的厚度范围为2.5μm。最终制得30μm的高可焊性的复合集流体10，在制备完成后，对高可焊性的复合集流体10进行分切收卷以及真空包装作业。Among them, the film support layer 100 is made of polybutylene terephthalate (PET). The thickness of the film support layer 100 is 25 μm, and the thickness of the alloy coating 200 ranges from 2.5 μm. Finally, a 30 μm composite current collector 10 with high weldability is produced. After the preparation is completed, the composite current collector 10 with high weldability is cut, rolled, and vacuum packed.
对比例1：Comparative example 1:
请参阅图3，本对比例提供的复合集流体10的制备方法，包括以下步骤：Please refer to Figure 3. The preparation method of the composite current collector 10 provided in this comparative example includes the following steps:
步骤1：选取6μm的薄膜支撑层100及99.9％纯度的金属铝。其中，薄膜支撑层100采用聚对苯二甲酸丁二醇酯(PET)。Step 1: Select a 6 μm film support layer 100 and 99.9% pure aluminum metal. Among them, the film support layer 100 is made of polybutylene terephthalate (PET).
步骤2：将6μm的薄膜支撑层100及99.9％纯度的金属铝分别投入真空镀膜设备内，并在薄膜支撑层100相背设置的两个表面蒸镀金属铝层，即可得到所需的复合集流体10。其中，本实施例中，金属铝层的厚度为1μm。Step 2: Put the 6 μm thin film support layer 100 and the 99.9% purity metal aluminum into the vacuum coating equipment respectively, and evaporate the metal aluminum layers on the two opposite surfaces of the thin film support layer 100 to obtain the required composite. Current collector 10. In this embodiment, the thickness of the metallic aluminum layer is 1 μm.
最终制得8μm的复合集流体10。在复合集流体10制备完成后，对复合集流体10进行分切收卷以及真空包装作业。Finally, an 8 μm composite current collector 10 was produced. After the preparation of the composite current collector 10 is completed, the composite current collector 10 is cut, rolled, and vacuum packed.
对比例2：Comparative example 2:
本对比例提供的复合集流体10的制备方法，包括以下步骤：The preparation method of the composite current collector 10 provided in this comparative example includes the following steps:
步骤1：选取25μm的薄膜支撑层100及99.9％纯度的金属铝。其中，薄膜支撑层100采用聚对苯二甲酸丁二醇酯(PET)。Step 1: Select a 25μm film support layer 100 and 99.9% pure aluminum metal. Among them, the film support layer 100 is made of polybutylene terephthalate (PET).
步骤2：将25μm的薄膜支撑层100及99.9％纯度的金属铝分别投入真空镀膜设备内，并在薄膜支撑层100相背设置的两个表面蒸镀金属铝层，即可得到所需的复合集流体10。其中，本实施例中，金属铝层的厚度为2.5μm。Step 2: Put the 25 μm thin film support layer 100 and the 99.9% purity metal aluminum into the vacuum coating equipment respectively, and evaporate the metal aluminum layers on the two opposite surfaces of the thin film support layer 100 to obtain the required composite. Current collector 10. In this embodiment, the thickness of the metallic aluminum layer is 2.5 μm.
最终制得30μm的复合集流体10。在复合集流体10制备完成后，对复合集流体10进行分切收卷以及真空包装作业。Finally, a 30 μm composite current collector 10 was produced. After the preparation of the composite current collector 10 is completed, the composite current collector 10 is cut, rolled, and vacuum packed.
对实施例1-3、对比例1-2的复合集流体10的焊接拉力进行测试，得到如表1所述的效果数据。需要理解的是：复合集流体10的焊接拉力是指薄膜支撑层100与合金镀层200、薄膜支撑层100与金属铝层之间的焊接拉力。The welding tensile force of the composite current collector 10 of Examples 1-3 and Comparative Examples 1-2 was tested, and the effect data as shown in Table 1 was obtained. It should be understood that the welding tension of the composite current collector 10 refers to the welding tension between the film support layer 100 and the alloy coating 200, and between the film support layer 100 and the metal aluminum layer.
表1为复合集流体10的焊接拉力测试数据。Table 1 shows the welding tensile test data of composite current collector 10.
方案plan 焊接拉力(N/M)Welding tension (N/M)
实施例1Example 1 4040
实施例2Example 2 3636
实施例3Example 3 3232
对比例1Comparative example 1 1515
对比例2Comparative example 2 1515
表1Table 1
从上表可以看出本发明的高可焊性的复合集流体10的焊接拉力大于对比例的复合集流体10的焊接拉力，且复合集流体10的焊接拉力与薄膜支撑层100的厚度、合金镀层200的厚度及金属铝层的厚度无关，仅与金属镍的含量有关，金属镍的含量越高，复合集流体10的焊接拉力越大。It can be seen from the above table that the welding pulling force of the composite current collector 10 with high weldability of the present invention is greater than the welding pulling force of the composite current collector 10 of the comparative example, and the welding pulling force of the composite current collector 10 is related to the thickness and alloy of the film support layer 100 The thickness of the coating 200 has nothing to do with the thickness of the metal aluminum layer, but is only related to the content of metal nickel. The higher the content of metal nickel, the greater the welding pulling force of the composite current collector 10 .
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims (10)

  1. 一种高可焊性的复合集流体，其特征在于，包括：A composite current collector with high weldability, which is characterized by including:
    薄膜支撑层，所述薄膜支撑层相背设置的两个表面上分别设置有合金镀层；Thin film support layer, the two surfaces of the thin film support layer that are arranged opposite to each other are respectively provided with alloy plating layers;
    其中，所述合金镀层包括均匀混合的金属铝及金属镍。Wherein, the alloy coating includes uniformly mixed metal aluminum and metal nickel.
  2. 根据权利要求1所述的高可焊性的复合集流体，其特征在于，所述金属铝与所述金属镍的比例为1：0.2-0.5。The composite current collector with high weldability according to claim 1, wherein the ratio of the metal aluminum to the metal nickel is 1:0.2-0.5.
  3. 根据权利要求1所述的高可焊性的复合集流体，其特征在于，金属铝及金属镍的纯度均≥99.8％。The composite current collector with high weldability according to claim 1, characterized in that the purity of metal aluminum and metal nickel is ≥99.8%.
  4. 根据权利要求1所述的高可焊性的复合集流体，其特征在于，所述薄膜支撑层的厚度范围为1μm-25μm，所述合金镀层的厚度范围为1μm-2.5μm。The composite current collector with high solderability according to claim 1, wherein the thickness of the film support layer ranges from 1 μm to 25 μm, and the thickness of the alloy plating layer ranges from 1 μm to 2.5 μm.
  5. 根据权利要求1所述的高可焊性的复合集流体，其特征在于，所述薄膜支撑层的穿刺强度≥100gf，MD拉伸强度≥200MPa,TD拉伸强度≥200MPa，MD延伸率≥30％,TD延伸率≥30％。The composite current collector with high weldability according to claim 1, characterized in that the puncture strength of the film support layer is ≥100gf, the MD tensile strength is ≥200MPa, the TD tensile strength is ≥200MPa, and the MD elongation is ≥30 %, TD elongation ≥30%.
  6. 根据权利要求1所述的高可焊性的复合集流体，其特征在于，所述薄膜支撑层的材质包括绝缘高分子材料、绝缘高分子复合材料、导电高分子材料、导电高分子复合材料中的至少一种。The composite current collector with high weldability according to claim 1, characterized in that the material of the film support layer includes insulating polymer materials, insulating polymer composite materials, conductive polymer materials, and conductive polymer composite materials. of at least one.
  7. 根据权利要求6所述的高可焊性的复合集流体，其特征在于，所述绝缘高分子材料包括聚酰胺(PA)、聚对苯二甲酸酯、聚酰亚胺(PI)、聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PPE)、聚氯乙烯(PVC)、芳纶、丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚对苯二甲酸丁二醇酯(PET)、聚对苯二甲酰对苯二胺(PPTA)、聚丙乙烯(PPE)、聚甲醛(POM)、环氧树脂、酚醛树脂、聚四氟乙烯(PTEE)、聚偏氟乙烯(PVDF)、硅橡胶、聚碳酸酯(PC)、聚乙烯醇(PVA)、聚乙二醇(PEG)、纤维素、淀粉、蛋白质、它们的衍生物、它们的交联物及它们的共聚物中的至少一种。The composite current collector with high solderability according to claim 6, characterized in that the insulating polymer material includes polyamide (PA), polyterephthalate, polyimide (PI), poly Ethylene (PE), polypropylene (PP), polystyrene (PPE), polyvinyl chloride (PVC), aramid, acrylonitrile-butadiene-styrene copolymer (ABS), polybutylene terephthalate Alcohol ester (PET), polyphenylene terephthalamide (PPTA), polypropylene (PPE), polyoxymethylene (POM), epoxy resin, phenolic resin, polytetrafluoroethylene (PTEE), polyvinylidene fluoride Ethylene (PVDF), silicone rubber, polycarbonate (PC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), cellulose, starch, protein, their derivatives, their cross-linked products and their At least one of the copolymers.
  8. 根据权利要求6所述的高可焊性的复合集流体，其特征在于，所述绝缘高分子复合材料为所述绝缘高分子材料与无机材料形成的复合材料；The composite current collector with high weldability according to claim 6, wherein the insulating polymer composite material is a composite material formed of the insulating polymer material and an inorganic material;
    其中，所述无机材料包括陶瓷材料、玻璃材料、陶瓷复合材料中的至少一种。Wherein, the inorganic material includes at least one of ceramic materials, glass materials, and ceramic composite materials.
  9. 一种如权利要求2所述的高可焊性的复合集流体的制备方法，其特征在于，包括以下步骤：A method for preparing a highly weldable composite current collector according to claim 2, characterized in that it includes the following steps:
    将所述金属铝及所述金属镍按照1：0.2-0.5的比例进行蒸发，以形成铝粒子及镍离子；The metal aluminum and the metal nickel are evaporated according to a ratio of 1:0.2-0.5 to form aluminum particles and nickel ions;
    所述铝粒子及所述镍离子沿靠近所述薄膜支撑层的方向进行输送，并附着于所述薄膜支撑层相背设置的两个表面，以在所述薄膜支撑层相背设置的两个表面上形成所述合金镀层。The aluminum particles and the nickel ions are transported in a direction close to the film support layer, and are attached to the two surfaces of the film support layer that are located opposite to each other, so that the two surfaces of the film support layer that are located opposite to each other are The alloy plating layer is formed on the surface.
  10. 根据权利要求9所述的高可焊性的复合集流体的制备方法，其特征在于，将所述金属铝及所述金属镍进行加热蒸发的方式包括电阻加热、电子束加热、射频感应加热、电弧加热及激光加热。The method for preparing a highly weldable composite current collector according to claim 9, wherein the method of heating and evaporating the metal aluminum and the metal nickel includes resistance heating, electron beam heating, and radio frequency induction heating. Arc heating and laser heating.
PCT/CN2022/116790 2022-06-29 2022-09-02 High-weldability composite current collector and preparation method therefor WO2024000804A1 (en)

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