WO2024011529A1 - Composite current collector, and preparation method therefor and application thereof - Google Patents

Composite current collector, and preparation method therefor and application thereof Download PDF

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Publication number
WO2024011529A1
WO2024011529A1 PCT/CN2022/105792 CN2022105792W WO2024011529A1 WO 2024011529 A1 WO2024011529 A1 WO 2024011529A1 CN 2022105792 W CN2022105792 W CN 2022105792W WO 2024011529 A1 WO2024011529 A1 WO 2024011529A1
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current collector
polymer material
metal layer
composite current
layer
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PCT/CN2022/105792
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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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Priority to PCT/CN2022/105792 priority Critical patent/WO2024011529A1/en
Publication of WO2024011529A1 publication Critical patent/WO2024011529A1/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
    • H01M4/66—Selection of materials
    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • 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 field of battery technology, and specifically to a composite current collector and its preparation method and application.
  • the current metal composite current collectors are mainly copper current collectors or aluminum current collectors.
  • the copper current collector or aluminum current collector is composed of two parts, including a metal layer and a polymer layer located between the metal layers.
  • the polymer layer in the middle of a conventional metal composite current collector has a non-porous structure, that is, the porosity is 0, and the upper and lower metal layers cannot conduct the ions above and below the current collector, resulting in the resistivity of the upper and lower metal layers. There is a difference, and the ion field formed is uneven, which leads to greater internal polarization of the battery and affects the electrochemical performance of the battery.
  • the present invention provides a composite current collector, which includes a first metal layer, a second metal layer and a polymer material layer.
  • the polymer material layer is located between the first metal layer and the second metal layer.
  • the composite current collector has a through-hole structure penetrating the first metal layer, the second metal layer and the polymer material layer; the pore diameter of the through-hole structure is 0.1 mm ⁇ 1 mm, and the porosity 0.1% to 5%.
  • the pore diameter of the through-hole structure is 0.5 mm to 1 mm, and the porosity is 0.1% to 5%.
  • the thickness of the composite current collector is 2 ⁇ m ⁇ 28 ⁇ m, wherein the thickness of the first metal layer and the second metal layer may be independently 0.5 ⁇ m ⁇ 1.5 ⁇ m, and the polymer material The thickness of the layer may range from 1 ⁇ m to 25 ⁇ m.
  • the material of the polymer material layer is selected from the group consisting of a composite of an insulating polymer material and an inorganic non-conductive filler, a composite of an insulating polymer material and a conductive filler, an insulating polymer material or a conductive polymer.
  • the insulating polymer material is selected from the group consisting of cellulose and its derivatives, starch and its derivatives, proteins and its derivatives, polyvinyl alcohol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers.
  • copolymer polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid, polyphenylenediamide, acrylonitrile-butadiene Olefin-styrene copolymer, polyethylene terephthalate, polybutylene terephthalate, poly(p-phenylene terephthalamide), polypropylene, polyformaldehyde, epoxy resin, phenolic resin , one or more of polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber and polycarbonate; and/or
  • the conductive polymer material is selected from doped polysulfide nitride and/or doped polyacetylene; and/or
  • the inorganic non-conductive filler is selected from one or more of ceramic materials, glass materials and ceramic composite materials; and/or
  • the conductive filler is selected from one or more of carbon black, carbon nanotubes, graphite, acetylene black, graphene, nickel, iron, copper, aluminum, alloy, nickel-coated graphite powder and nickel-coated carbon fiber. .
  • the present invention also provides a method for preparing the composite current collector as described above, which includes the following steps:
  • the first metal layer and the second metal layer are respectively formed on both sides of the polymer material layer, and holes are drilled through the polymer material layer and the first metal layer according to the distribution principle of the through-hole structure. layer and the second metal layer.
  • the plating method is vacuum evaporation, and/or the drilling method is laser drilling;
  • the evaporation temperature of the plating material for vacuum evaporation is 600°C to 1600°C, the vacuum degree is ⁇ 1 ⁇ 10 -2 Pa, and the evaporation rate is 10m/min to 100m/min;
  • the wavelength of the laser drilling is 400nm ⁇ 700nm.
  • the present invention further provides a cathode, which includes the above-mentioned composite current collector and a cathode active material layer located on the surface of the composite current collector.
  • the present invention provides a battery, which includes the above-mentioned positive electrode.
  • the present invention also provides an electrical device, which includes the above-mentioned battery.
  • a porous composite current collector is prepared by arranging through holes and regulating the diameter and distance of the through holes.
  • the through-hole structure can allow ions to pass through, so that the ion concentrations on the surfaces of the first metal layer and the second metal layer gradually tend to Consistently, the polarization on the surface of the first metal layer and the second metal layer of the composite current collector is reduced, and the electrical performance of the battery is improved, especially while reducing the internal resistance of the battery and improving its rate performance.
  • Figure 1 is a schematic structural diagram of a porous composite current collector produced in one embodiment of the present invention
  • Figure 2 is a top view of the porous composite current collector in Figure 1.
  • the first object of the present invention is to provide a composite current collector, which includes a first metal layer, a second metal layer and a polymer material layer.
  • the polymer material layer is located between the first metal layer and the second metal layer.
  • the composite current collector It has a through-hole structure penetrating the first metal layer, the second metal layer and the polymer material layer; wherein the through-hole structure has a pore diameter of 0.1 mm to 1 mm and a porosity of 0.1% to 5%.
  • a porous composite current collector is prepared by arranging through holes and regulating the diameter and distance of the through holes.
  • the through-hole structure can allow ions to pass through, so that the ion concentrations on the surfaces of the first metal layer and the second metal layer tend to be consistent.
  • the polarization on the surface of the first metal layer and the second metal layer of the composite current collector is reduced, thereby improving the electrical performance of the battery, especially while reducing the internal resistance of the battery and improving its rate performance.
  • the aperture of the through-hole structure can be any value between 0.1mm and 1mm, preferably between 0.5mm and 1mm.
  • it can also be 0.6mm, 0.7mm, 0.8mm, 0.9mm;
  • the porosity can be any value between 0.1% and 5%, for example, it can also be 0.5%, 1%, 2%, 3%, 4%, or 4.5%.
  • the center distance between two adjacent through holes can be any value between 5mm and 10mm, for example, it can also be 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5 mm, 9mm, 9.5mm, preferably any value between 8mm and 10mm.
  • the thickness of the composite current collector may be 2 ⁇ m to 28 ⁇ m, for example, it may also be 5 ⁇ m, 8 ⁇ m, 10 ⁇ m, 12 ⁇ m, 15 ⁇ m, 18 ⁇ m, 20 ⁇ m, 22 ⁇ m, or 25 ⁇ m.
  • the thickness of the first metal layer and the second metal layer may be independently 0.5 ⁇ m to 1.5 ⁇ m, and the thickness of the polymer material layer may be 1 ⁇ m to 25 ⁇ m.
  • the polymer material layer can be made of any material commonly used in the art, including but not limited to a composite of insulating polymer materials and inorganic non-conductive fillers, or a composite of insulating polymer materials and conductive fillers. material, insulating polymer material or conductive polymer material, wherein the mass percentage of insulating polymer material in the composite formed by insulating polymer material and inorganic non-conductive filler is ⁇ 90%, and the composite formed by insulating polymer material and conductive filler The mass percentage of medium insulating polymer material is ⁇ 90%.
  • the insulating polymer material may be selected from the group consisting of cellulose and its derivatives, starch and its derivatives, protein and its derivatives, polyvinyl alcohol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers.
  • the conductive polymer material may be selected from doped polysulfide nitride and/or doped polyacetylene.
  • the inorganic non-conductive filler can be selected from one or more of ceramic materials, glass materials and ceramic composite materials;
  • the conductive filler can be selected from at least one of conductive carbon materials, metal materials, and composite conductive materials.
  • the carbon material can be selected from carbon black, carbon nanotubes, graphite, acetylene black, and graphene.
  • the metal material can be selected from Nickel, iron, copper, aluminum, alloy, wherein the alloy contains one or more of nickel, iron, copper and aluminum, the composite conductive material can be selected from one of nickel-coated graphite powder and nickel-coated carbon fiber or more.
  • the puncture strength of the polymer material layer is ⁇ 100gf
  • the longitudinal (MD) tensile strength is ⁇ 180MPa
  • the longitudinal (MD) elongation is ⁇ 10%
  • the transverse (TD) tensile strength is ⁇ 180MPa
  • the transverse (TD) tensile strength is ⁇ 180MPa.
  • the composite current collector is a positive electrode current collector, and its puncture strength is ⁇ 50gf, the longitudinal (MD) tensile strength is ⁇ 180MPa, the longitudinal (MD) elongation is ⁇ 10%, and the transverse (TD) tensile strength is ⁇ 180MPa. , Transverse (TD) elongation ⁇ 10%.
  • the peeling force between the first metal layer and the second metal layer and the polymer material layer is ⁇ 5 N/m.
  • the first metal layer and the second metal layer may be copper metal layers or aluminum metal layers.
  • the purity of the first metal layer and the second metal layer is ⁇ 99.8%.
  • the present invention also provides a method for preparing the composite current collector as described above, which includes the following steps:
  • a first metal layer and a second metal layer are respectively formed on both sides of the polymer material layer, and holes are drilled through the polymer material layer, the first metal layer and the second metal layer according to the distribution principle of the through-hole structure.
  • the plating method can be vacuum evaporation, where the parameters of vacuum evaporation need to meet any of the following: the evaporation temperature of the plating material can be 600°C to 1600°C, and the vacuum degree is ⁇ 1 ⁇ 10 -2 Pa, the evaporation rate is 10m/min ⁇ 100m/min.
  • the degree of vacuum may be 0.1 ⁇ 10 -2 Pa to 0.8 ⁇ 10 -2 Pa.
  • the evaporation rate is the moving speed of the polymer material layer.
  • the drilling method may be laser drilling; preferably, the wavelength of laser drilling may be 400 nm to 700 nm.
  • the preparation method further includes the steps of rolling and vacuum packaging.
  • the present invention further provides a cathode, which includes the above-mentioned composite current collector and a cathode active material layer located on the surface of the composite current collector.
  • the cathode active material in the cathode active material layer can be any cathode active material known in the art, for example, it can be lithium cobalt oxide, lithium iron phosphate, NCA, NCM, lithium manganate, lithium nickelate , NCMA or cobalt-free cathode.
  • the present invention provides a battery, which includes the above-mentioned positive electrode.
  • the battery may further include a negative electrode and an electrolyte.
  • the negative electrode can also be any negative electrode commonly used in this field, such as graphite, lithium, and lithium titanate.
  • the electrolyte may be a solid electrolyte, a semi-solid electrolyte or a liquid electrolyte, wherein the solid electrolyte and the semi-solid electrolyte may be oxide or sulfide electrolytes, and the solute in the liquid electrolyte may be lithium hexafluorophosphate.
  • the battery may further include a separator, wherein the separator may be any separator known in the art, such as a PE wet separator, a PP dry separator or a double-layer PE/PP coated separator.
  • the separator may be any separator known in the art, such as a PE wet separator, a PP dry separator or a double-layer PE/PP coated separator.
  • the shape of the battery is not limited, for example, it can be cylindrical, square, or can also be an aluminum-plastic film soft package.
  • the battery may be a lithium-ion battery.
  • the present invention also provides an electrical device, which includes the above-mentioned battery.
  • specific types of electrical devices include, but are not limited to, mobile terminals (mobile phones, mobile computers, etc.), smart wearables, power tools (electric drills, electric motors, etc.), electric vehicles, mobile power supplies, etc.
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a PET film
  • the pore structure runs through the thickness direction of the porous composite current collector.
  • Channel 400 is formed.
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to obtain a porous composite current collector with channels 400; wherein the depth of the channels 400 is 8 ⁇ m and the pore diameter is 0.5 mm. The center distance between adjacent circular holes is 8mm; the wavelength of laser drilling is 600nm.
  • the measured puncture strength of the porous composite current collector is 200gf; the longitudinal (MD) tensile strength is 210MPa, and the longitudinal (MD) elongation is 35%; the transverse (TD) tensile strength is 190MPa, and the transverse (TD) elongation is 15 %.
  • the peeling force between the first metal layer 100 or the second metal layer 200 and the polymer material layer 300 was measured to be 5 N/m.
  • Positive electrode composed of the porous composite current collector prepared in (1) and the lithium iron phosphate active material coated on the porous composite current collector;
  • Negative electrode graphite
  • Electrolyte liquid electrolyte with lithium hexafluorophosphate as solute
  • the method of preparing the porous composite current collector in this embodiment is basically the same as that in Example 1, except that the pore diameter is 1 mm. Specific steps are as follows:
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a PET film
  • the pore structure runs through the thickness direction of the porous composite current collector.
  • Channel 400 is formed.
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein, the depth of the hole channel 400 is 8 ⁇ m, the aperture is 1 mm, and the adjacent circular holes are The center distance between the circles is 8mm; the wavelength of laser drilling is 600nm.
  • the method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the center distance between adjacent circular holes is 5 mm. Specific steps are as follows:
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a PET film
  • the pore structure runs through the thickness direction of the porous composite current collector.
  • Channel 400 is formed.
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 ⁇ m, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 5mm; the wavelength of laser drilling is 500nm.
  • the method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the center distance between adjacent circular holes is 10 mm. Specific steps are as follows:
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a PET film
  • the pore structure runs through the thickness direction of the porous composite current collector.
  • Channel 400 is formed.
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 ⁇ m, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 10mm; the wavelength of laser drilling is 600nm.
  • the method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the polymer material layer 300 is made of a conductive film composed of polyethylene and graphite with a mass ratio of 9:1. Specific steps are as follows:
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a conductive material composed of polyethylene and graphite (mass ratio is 9:1).
  • the film and pore structure run through the thickness direction of the porous composite current collector to form pore channels 400 .
  • the specific preparation steps are as follows:
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 ⁇ m, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 8mm; the parameters of laser drilling are as follows: the wavelength is 600nm.
  • the preparation method of this comparative example is basically the same as that of Example 1, except that the current collector is not perforated, that is, the holes 400 are not formed. Specific steps are as follows:
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • the puncture strength of the composite current collector was measured to be 190gf; the longitudinal (MD) tensile strength was 220MPa, and the longitudinal (MD) elongation was 43%; the transverse (TD) tensile strength was 200MPa, and the transverse (TD) elongation was 21% .
  • the peeling force between the first metal layer 100 or the second metal layer 200 and the polymer material layer 300 was measured to be 5 N/m.
  • Positive electrode composed of the composite current collector prepared in (1) and the lithium iron phosphate active material coated on the composite current collector;
  • Negative electrode graphite
  • Electrolyte liquid electrolyte with lithium hexafluorophosphate as solute
  • the preparation method of this comparative example is basically the same as that of Example 1, except that the hole diameter is 2 mm. Specific steps are as follows:
  • the first metal layer 100 and the second metal layer 200 are both metal aluminum layers
  • the polymer material layer 300 is a PET film
  • the pore structure runs through the thickness direction of the porous composite current collector.
  • Channel 400 is formed.
  • the specific parameters are as follows: vacuum degree is 0.5 ⁇ 10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
  • step 2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to obtain a porous composite current collector with pore channels 400; wherein the depth of the pore channels 400 is 8 ⁇ m and the pore diameter is 2 mm. The center distance between adjacent circular holes is 8mm; the parameters of laser drilling are as follows: the wavelength is 600nm.
  • Positive electrode composed of the porous composite current collector prepared in (1) and the lithium iron phosphate active material coated on the porous composite current collector;
  • Negative electrode graphite
  • Electrolyte liquid electrolyte with lithium hexafluorophosphate as solute
  • the polarization internal resistance test, capacity retention rate and charge and discharge cycle performance test refer to the national standard GB18287_2000, and the test results are shown in Table 1.
  • Capacity retention rate Test the capacity retention rate of the lithium iron phosphate batteries assembled in Example 1 and Comparative Examples 1-2 at 25°C and 3C rate for 1000 cycles. The test results are shown in Table 1;
  • the ion concentration of the upper and lower metal layers of the current collector can be made consistent, thereby reducing the polarization on the surface of the upper and lower metal layers of the porous composite current collector, and improving the performance of the battery. Electrical properties, especially the internal resistance and rate performance of the battery. Furthermore, further regulating the parameters of the pore structure, such as the pore diameter and the center distance between the pores, can reduce the polarization of the porous composite current collector while having excellent mechanical strength. Moreover, larger pore diameter and more pores will also reduce the strength of the composite current collector.

Abstract

Provided are a composite current collector, and a preparation method therefor and an application thereof. The composite current collector comprises a first metal layer (100), a second metal layer (200), and a polymer material layer (300). The polymer material layer (300) is located between the first metal layer (100) and the second metal layer (200). The composite current collector has a through hole structure passing through the first metal layer (100), the second metal layer (200) and the polymer material layer (300). The pore diameter of the through hole structure is 0.1-1 mm, and the porosity is 0.1-5%. According to the composite current collector, ionic conduction can be implemented, polarization in batteries can be reduced, and the electrochemical performance of batteries can be improved.

Description

复合集流体及其制备方法和应用Composite current collector and its preparation method and application 技术领域Technical field
本发明涉及电池技术领域，具体而言，涉及一种复合集流体及其制备方法和应用。The present invention relates to the field of battery technology, and specifically to a composite current collector and its preparation method and application.
背景技术Background technique
目前的金属复合集流体主要为铜集流体或铝集流体。其中，铜集流体或铝集流体都由两部分构成，包括金属层以及位于金属层之间的高分子层。但是常规的金属复合集流体中间的高分子层为无孔结构，即孔隙率为0，且上下两层的金属层也无法将集流体上下的离子进行导通，导致上下两金属层的电阻率有差异，形成的离子场不均匀，从而致使电池内部极化较大，影响电池的电化学性能。The current metal composite current collectors are mainly copper current collectors or aluminum current collectors. Among them, the copper current collector or aluminum current collector is composed of two parts, including a metal layer and a polymer layer located between the metal layers. However, the polymer layer in the middle of a conventional metal composite current collector has a non-porous structure, that is, the porosity is 0, and the upper and lower metal layers cannot conduct the ions above and below the current collector, resulting in the resistivity of the upper and lower metal layers. There is a difference, and the ion field formed is uneven, which leads to greater internal polarization of the battery and affects the electrochemical performance of the battery.
发明内容Contents of the invention
基于此，有必要提供一种能够进行离子导通，且可以降低电池内部极化及提高电池电化学性能的复合集流体及其制备方法和应用。Based on this, it is necessary to provide a composite current collector that can conduct ions, reduce the internal polarization of the battery, and improve the electrochemical performance of the battery, as well as its preparation method and application.
本发明一方面，提供一种复合集流体，其包括第一金属层、第二金属层和聚合物材料层，所述聚合物材料层位于所述第一金属层和所述第二金属层之间，所述复合集流体具有贯穿于所述第一金属层、所述第二金属层和所述聚合物材料层的通孔结构；所述通孔结构的孔径为0.1mm～1mm，孔隙率为0.1％～5％。In one aspect, the present invention provides a composite current collector, which includes a first metal layer, a second metal layer and a polymer material layer. The polymer material layer is located between the first metal layer and the second metal layer. , the composite current collector has a through-hole structure penetrating the first metal layer, the second metal layer and the polymer material layer; the pore diameter of the through-hole structure is 0.1 mm ~ 1 mm, and the porosity 0.1% to 5%.
在一些实施方式中，所述通孔结构的孔径为0.5mm～1mm，孔隙率为0.1％～5％。In some embodiments, the pore diameter of the through-hole structure is 0.5 mm to 1 mm, and the porosity is 0.1% to 5%.
在一些实施方式中，所述复合集流体的厚度为2μm～28μm其中，所述第一金属层和所述第二金属层的厚度可以分别独立地为0.5μm～1.5μm，所述聚合物材料层的厚度可以为1μm～25μm。In some embodiments, the thickness of the composite current collector is 2 μm ~ 28 μm, wherein the thickness of the first metal layer and the second metal layer may be independently 0.5 μm ~ 1.5 μm, and the polymer material The thickness of the layer may range from 1 μm to 25 μm.
在一些实施方式中，所述聚合物材料层的材质选自绝缘聚合物材料和无机非导电填料形成的复合物、绝缘聚合物材料和导电填料形成的复合物、绝缘聚合物材料或导电聚合物材料，其中，所述绝缘聚合物材料和无机非导电填料形成的复合物中所述绝缘聚合物材料的质量百分比≥90％，所述绝缘聚合物材料和导电填料形成的复合物中所述绝缘聚合物材料的质量百分比≥90％。In some embodiments, the material of the polymer material layer is selected from the group consisting of a composite of an insulating polymer material and an inorganic non-conductive filler, a composite of an insulating polymer material and a conductive filler, an insulating polymer material or a conductive polymer. Material, wherein the mass percentage of the insulating polymer material in the composite formed by the insulating polymer material and the inorganic non-conductive filler is ≥90%, and the insulation in the composite formed by the insulating polymer material and the conductive filler The mass percentage of polymer material is ≥90%.
在一些实施方式中，所述绝缘聚合物材料选自纤维素及其衍生物、淀粉及其衍生物、蛋白质及其衍生物、聚乙烯醇及其交联聚合物、聚乙二醇及其交联聚合物、聚酰胺、聚对苯二甲酸酯、聚酰亚胺、聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、芳纶、聚二甲酰苯二胺、丙烯腈-丁二烯-苯乙烯共聚物、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚对苯二甲酰对苯二胺、聚丙乙烯、聚甲醛、环氧树脂、酚醛树脂、聚四氟乙烯、聚偏氟乙烯、硅橡胶及聚碳酸酯中的一种或多种；和/或In some embodiments, the insulating polymer material is selected from the group consisting of cellulose and its derivatives, starch and its derivatives, proteins and its derivatives, polyvinyl alcohol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers. copolymer, polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid, polyphenylenediamide, acrylonitrile-butadiene Olefin-styrene copolymer, polyethylene terephthalate, polybutylene terephthalate, poly(p-phenylene terephthalamide), polypropylene, polyformaldehyde, epoxy resin, phenolic resin , one or more of polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber and polycarbonate; and/or
所述导电聚合物材料选自掺杂聚氮化硫和/或掺杂聚乙炔；和/或The conductive polymer material is selected from doped polysulfide nitride and/or doped polyacetylene; and/or
所述无机非导电填料选自陶瓷材料、玻璃材料及陶瓷复合材料中的一种或多种；和/或The inorganic non-conductive filler is selected from one or more of ceramic materials, glass materials and ceramic composite materials; and/or
所述导电填料选自碳黑、碳纳米管、石墨、乙炔黑、石墨烯、镍、铁、铜、铝、合金、镍包覆的石墨粉及镍包覆的碳纤维中的一种或多种。The conductive filler is selected from one or more of carbon black, carbon nanotubes, graphite, acetylene black, graphene, nickel, iron, copper, aluminum, alloy, nickel-coated graphite powder and nickel-coated carbon fiber. .
本发明一方面，还提供一种如上述所述的复合集流体的制备方法，包括以下步骤：In one aspect, the present invention also provides a method for preparing the composite current collector as described above, which includes the following steps:
在所述聚合物材料层的两面分别形成所述第一金属层和所述第二金属层， 并按照所述通孔结构的分布原则打孔贯穿所述聚合物材料层、所述第一金属层和所述第二金属层。The first metal layer and the second metal layer are respectively formed on both sides of the polymer material layer, and holes are drilled through the polymer material layer and the first metal layer according to the distribution principle of the through-hole structure. layer and the second metal layer.
在一些实施方式中，所述镀覆的方法为真空蒸镀，和/或所述打孔的方法为激光打孔；In some embodiments, the plating method is vacuum evaporation, and/or the drilling method is laser drilling;
可选地，所述真空蒸镀的镀料蒸发温度为600℃～1600℃，真空度＜1×10 -2Pa，蒸镀速率为10m/min～100m/min； Optionally, the evaporation temperature of the plating material for vacuum evaporation is 600°C to 1600°C, the vacuum degree is <1×10 -2 Pa, and the evaporation rate is 10m/min to 100m/min;
可选地，所述激光打孔的波长为400nm～700nm。Optionally, the wavelength of the laser drilling is 400nm ~ 700nm.
本发明另一方面，进一步提供一种正极，其包括上述所述的复合集流体及位于所述复合集流体表面的正极活性材料层。In another aspect, the present invention further provides a cathode, which includes the above-mentioned composite current collector and a cathode active material layer located on the surface of the composite current collector.
本发明再一方面，提供一种电池，其包括上述所述的正极。In yet another aspect, the present invention provides a battery, which includes the above-mentioned positive electrode.
本发明又一方面，还提供一种用电装置，其包括上述所述的电池。In another aspect, the present invention also provides an electrical device, which includes the above-mentioned battery.
上述提供的复合集流体通过设置通孔，并调控通孔的孔径和距离制备了多孔复合集流体。在复合集流体第一金属层和第二金属层的电阻率有差异，离子场不一致时，通孔结构可以供离子通过，从而使第一金属层和第二金属层表面的离子浓度逐渐趋于一致，减少了复合集流体第一金属层和第二金属层表面的极化，提升了电池的电性能，尤其是在降低电池内阻的同时，提高了其倍率性能。In the composite current collector provided above, a porous composite current collector is prepared by arranging through holes and regulating the diameter and distance of the through holes. When the resistivities of the first metal layer and the second metal layer of the composite current collector are different and the ion fields are inconsistent, the through-hole structure can allow ions to pass through, so that the ion concentrations on the surfaces of the first metal layer and the second metal layer gradually tend to Consistently, the polarization on the surface of the first metal layer and the second metal layer of the composite current collector is reduced, and the electrical performance of the battery is improved, especially while reducing the internal resistance of the battery and improving its rate performance.
附图说明Description of drawings
为了更清楚地说明本发明具体实施方式或现有技术中的技术方案，下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施方式，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 explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.
图1为本发明一个实施例中制得的多孔复合集流体的结构示意图；Figure 1 is a schematic structural diagram of a porous composite current collector produced in one embodiment of the present invention;
图2为图1中多孔复合集流体的俯视图。Figure 2 is a top view of the porous composite current collector in Figure 1.
附图标记说明：100、第一金属层；200、第二金属层；300、聚合物材料层；400、孔道。Explanation of reference signs: 100. First metal layer; 200. Second metal layer; 300. Polymer material layer; 400. Channel.
具体实施方式Detailed ways
现将详细地提供本发明实施方式的参考，其一个或多个实例描述于下文。提供每一实例作为解释而非限制本发明。实际上，对本领域技术人员而言，显而易见的是，可以对本发明进行多种修改和变化而不背离本发明的范围或精神。例如，作为一个实施方式的部分而说明或描述的特征可以用于另一实施方式中，来产生更进一步的实施方式。Reference will now be made in detail to embodiments of the invention, one or more examples of which are described below. Each example is provided by way of explanation, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used in another embodiment, to yield still further embodiments.
因此，旨在本发明覆盖落入所附权利要求的范围及其等同范围中的此类修改和变化。本发明的其它对象、特征和方面公开于以下详细描述中或从中是显而易见的。本领域普通技术人员应理解本讨论仅是示例性实施方式的描述，而非意在限制本发明更广阔的方面。Thus, it is intended that the present invention cover such modifications and variations as come within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the invention are disclosed in, or are apparent from, the following detailed description. Those of ordinary skill in the art will appreciate that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the invention.
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
除了在操作实施例中所示以外或另外表明之外，所有在说明书和权利要求中表示成分的量、物化性质等所使用的数字理解为在所有情况下通过术语“约”来调整。例如，因此，除非有相反的说明，否则上述说明书和所附权利要求书中列出的数值参数均是近似值，本领域的技术人员能够利用本文所公开的教导 内容寻求获得的所需特性，适当改变这些近似值。用端点表示的数值范围的使用包括该范围内的所有数字以及该范围内的任何范围，例如，1至5包括1、1.1、1.3、1.5、2、2.75、3、3.80、4和5等等。Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express amounts, physicochemical properties, etc. of ingredients are to be understood to be adjusted in all cases by the term "about." For example, therefore, unless stated to the contrary, the numerical parameters set forth in the foregoing specification and appended claims are approximations, and those skilled in the art will be able to seek to obtain the desired properties using the teachings disclosed herein, as appropriate. Change these approximations. The use of numerical ranges expressed by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, etc. .
本发明第一目的，提供一种复合集流体，其包括第一金属层、第二金属层和聚合物材料层，聚合物材料层位于第一金属层和第二金属层之间，复合集流体具有贯穿于第一金属层、第二金属层和聚合物材料层的通孔结构；其中，通孔结构的孔径为0.1mm～1mm，孔隙率为0.1％～5％。The first object of the present invention is to provide a composite current collector, which includes a first metal layer, a second metal layer and a polymer material layer. The polymer material layer is located between the first metal layer and the second metal layer. The composite current collector It has a through-hole structure penetrating the first metal layer, the second metal layer and the polymer material layer; wherein the through-hole structure has a pore diameter of 0.1 mm to 1 mm and a porosity of 0.1% to 5%.
上述提供的复合集流体通过设置通孔，并调控通孔的孔径和距离制备了多孔复合集流体。在复合集流体第一金属层和第二金属层的电阻率有差异，离子场不一致时，通孔结构可以离子通过，从而使第一金属层和第二金属层表面的离子浓度趋于一致，减少了复合集流体第一金属层和第二金属层表面的极化，提升了电池的电性能，尤其是在降低电池内阻的同时，提高了其倍率性能。In the composite current collector provided above, a porous composite current collector is prepared by arranging through holes and regulating the diameter and distance of the through holes. When the resistivities of the first metal layer and the second metal layer of the composite current collector are different and the ion fields are inconsistent, the through-hole structure can allow ions to pass through, so that the ion concentrations on the surfaces of the first metal layer and the second metal layer tend to be consistent. The polarization on the surface of the first metal layer and the second metal layer of the composite current collector is reduced, thereby improving the electrical performance of the battery, especially while reducing the internal resistance of the battery and improving its rate performance.
在其中一个实施例中，通孔结构的孔径可以为0.1mm～1mm之间的任意值，优选为0.5mm～1mm之间的任意值，例如，还可以为0.6mm、0.7mm、0.8mm、0.9mm；In one embodiment, the aperture of the through-hole structure can be any value between 0.1mm and 1mm, preferably between 0.5mm and 1mm. For example, it can also be 0.6mm, 0.7mm, 0.8mm, 0.9mm;
在其中一个实施例中，孔隙率可以为0.1％～5％之间的任意值，例如，还可以为0.5％、1％、2％、3％、4％、4.5％。In one embodiment, the porosity can be any value between 0.1% and 5%, for example, it can also be 0.5%, 1%, 2%, 3%, 4%, or 4.5%.
在其中一个实施例中，两个相邻通孔之间的圆心距可以为5mm～10mm之间的任意值，例如，还可以为5.5mm、6mm、6.5mm、7mm、7.5mm、8mm、8.5mm、9mm、9.5mm，优选为8mm～10mm之间的任意值。In one embodiment, the center distance between two adjacent through holes can be any value between 5mm and 10mm, for example, it can also be 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5 mm, 9mm, 9.5mm, preferably any value between 8mm and 10mm.
在其中一个实施例中，复合集流体的厚度可以为2μm～28μm，例如，还可以为5μm、8μm、10μm、12μm、15μm、18μm、20μm、22μm、25μm。优选地，第一金属层和第二金属层的厚度可以分别独立地为0.5μm～1.5μm，聚合物材料 层的厚度可以为1μm～25μm。In one embodiment, the thickness of the composite current collector may be 2 μm to 28 μm, for example, it may also be 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, or 25 μm. Preferably, the thickness of the first metal layer and the second metal layer may be independently 0.5 μm to 1.5 μm, and the thickness of the polymer material layer may be 1 μm to 25 μm.
在其中一个实施例中，聚合物材料层的材质可以为本领域常用的任意材质，包括但不限于绝缘聚合物材料和无机非导电填料形成的复合物、绝缘聚合物材料和导电填料形成的复合物、绝缘聚合物材料或导电聚合物材料，其中，绝缘聚合物材料和无机非导电填料形成的复合物中绝缘聚合物材料的质量百分比≥90％，绝缘聚合物材料和导电填料形成的复合物中绝缘聚合物材料的质量百分比≥90％。In one embodiment, the polymer material layer can be made of any material commonly used in the art, including but not limited to a composite of insulating polymer materials and inorganic non-conductive fillers, or a composite of insulating polymer materials and conductive fillers. material, insulating polymer material or conductive polymer material, wherein the mass percentage of insulating polymer material in the composite formed by insulating polymer material and inorganic non-conductive filler is ≥90%, and the composite formed by insulating polymer material and conductive filler The mass percentage of medium insulating polymer material is ≥90%.
所述绝缘聚合物材料可以选自纤维素及其衍生物、淀粉及其衍生物、蛋白质及其衍生物、聚乙烯醇及其交联聚合物、聚乙二醇及其交联聚合物、聚酰胺、聚对苯二甲酸酯、聚酰亚胺、聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、芳纶、聚二甲酰苯二胺、丙烯腈-丁二烯-苯乙烯共聚物、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚对苯二甲酰对苯二胺、聚丙乙烯、聚甲醛、环氧树脂、酚醛树脂、聚四氟乙烯、聚偏氟乙烯、硅橡胶及聚碳酸酯中的一种或多种；The insulating polymer material may be selected from the group consisting of cellulose and its derivatives, starch and its derivatives, protein and its derivatives, polyvinyl alcohol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers, polyethylene glycol and its cross-linked polymers. Amide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid, polyphenylenediamide, acrylonitrile-butadiene-styrene copolymer Materials, polyethylene terephthalate, polybutylene terephthalate, poly(p-phenylene terephthalamide), polypropylene, polyformaldehyde, epoxy resin, phenolic resin, polytetrafluoroethylene , one or more of polyvinylidene fluoride, silicone rubber and polycarbonate;
所述导电聚合物材料可以选自掺杂聚氮化硫和/或掺杂聚乙炔。The conductive polymer material may be selected from doped polysulfide nitride and/or doped polyacetylene.
所述无机非导电填料可以选自陶瓷材料、玻璃材料及陶瓷复合材料中的一种或多种；The inorganic non-conductive filler can be selected from one or more of ceramic materials, glass materials and ceramic composite materials;
所述导电填料可以选自导电碳材料、金属材料、复合导电材料中的至少一种，其中，碳材料可以选自碳黑、碳纳米管、石墨、乙炔黑、石墨烯，金属材料可以选自镍、铁、铜、铝、合金、其中合金含有镍、铁、铜及铝中的一种或多种，复合导电材料可以选自镍包覆的石墨粉及镍包覆的碳纤维中的一种或多种。The conductive filler can be selected from at least one of conductive carbon materials, metal materials, and composite conductive materials. The carbon material can be selected from carbon black, carbon nanotubes, graphite, acetylene black, and graphene. The metal material can be selected from Nickel, iron, copper, aluminum, alloy, wherein the alloy contains one or more of nickel, iron, copper and aluminum, the composite conductive material can be selected from one of nickel-coated graphite powder and nickel-coated carbon fiber or more.
在其中一个实施例中，聚合物材料层的穿刺强度≥100gf，纵向(MD)拉伸强度≥180MPa，纵向(MD)延伸率≥10％，横向(TD)拉伸强度≥180MPa， 横向(TD)延伸率≥10％。In one embodiment, the puncture strength of the polymer material layer is ≥100gf, the longitudinal (MD) tensile strength is ≥180MPa, the longitudinal (MD) elongation is ≥10%, the transverse (TD) tensile strength is ≥180MPa, and the transverse (TD) tensile strength is ≥180MPa. ) elongation ≥10%.
在其中一个实施例中，复合集流体为正极集流体，其穿刺强度≥50gf，纵向(MD)拉伸强度≥180MPa，纵向(MD)延伸率≥10％，横向(TD)拉伸强度≥180MPa，横向(TD)延伸率≥10％。In one embodiment, the composite current collector is a positive electrode current collector, and its puncture strength is ≥50gf, the longitudinal (MD) tensile strength is ≥180MPa, the longitudinal (MD) elongation is ≥10%, and the transverse (TD) tensile strength is ≥180MPa. , Transverse (TD) elongation ≥10%.
在其中一个实施例中，第一金属层和第二金属层与聚合物材料层之间的剥离力≥5N/m。In one embodiment, the peeling force between the first metal layer and the second metal layer and the polymer material layer is ≥5 N/m.
在其中一个实施例中，第一金属层和第二金属层可以为铜金属层或铝金属层。优选地，第一金属层和第二金属层的纯度≥99.8％。In one embodiment, the first metal layer and the second metal layer may be copper metal layers or aluminum metal layers. Preferably, the purity of the first metal layer and the second metal layer is ≥99.8%.
本发明一方面，还提供一种如上述所述的复合集流体的制备方法，包括以下步骤：In one aspect, the present invention also provides a method for preparing the composite current collector as described above, which includes the following steps:
在聚合物材料层的两面分别形成第一金属层和第二金属层，并按照通孔结构的分布原则打孔贯穿聚合物材料层、第一金属层和第二金属层。A first metal layer and a second metal layer are respectively formed on both sides of the polymer material layer, and holes are drilled through the polymer material layer, the first metal layer and the second metal layer according to the distribution principle of the through-hole structure.
在其中一个实施例中，镀覆的方法可以为真空蒸镀，其中真空蒸镀的参数需满足下列任意一项：镀料蒸发温度可以为600℃～1600℃，真空度＜1×10 -2Pa，蒸镀速率为10m/min～100m/min。例如，真空度可以为0.1×10 -2Pa～0.8×10 -2Pa。其中，蒸镀速率为聚合物材料层的移动速度。 In one embodiment, the plating method can be vacuum evaporation, where the parameters of vacuum evaporation need to meet any of the following: the evaporation temperature of the plating material can be 600°C to 1600°C, and the vacuum degree is <1×10 -2 Pa, the evaporation rate is 10m/min~100m/min. For example, the degree of vacuum may be 0.1×10 -2 Pa to 0.8×10 -2 Pa. Wherein, the evaporation rate is the moving speed of the polymer material layer.
在其中一个实施例中，打孔的方法可以为激光打孔；优选地，激光打孔的波长可以为400nm～700nm。In one embodiment, the drilling method may be laser drilling; preferably, the wavelength of laser drilling may be 400 nm to 700 nm.
在其中一个实施例中，所述制备方法还包括收卷和真空包装的步骤。In one embodiment, the preparation method further includes the steps of rolling and vacuum packaging.
本发明另一方面，进一步提供一种正极，其包括上述所述的复合集流体及位于复合集流体表面的正极活性材料层。In another aspect, the present invention further provides a cathode, which includes the above-mentioned composite current collector and a cathode active material layer located on the surface of the composite current collector.
在其中一个实施例中，正极活性材料层中的正极活性材料可以为本领域公知的任意正极活性材料，例如，可以为钴酸锂、磷酸铁锂、NCA、NCM、锰酸 锂、镍酸锂、NCMA或无钴正极。In one embodiment, the cathode active material in the cathode active material layer can be any cathode active material known in the art, for example, it can be lithium cobalt oxide, lithium iron phosphate, NCA, NCM, lithium manganate, lithium nickelate , NCMA or cobalt-free cathode.
本发明再一方面，提供一种电池，其包括上述所述的正极。In yet another aspect, the present invention provides a battery, which includes the above-mentioned positive electrode.
在其中一个实施例中，电池还可以包括负极和电解质。In one embodiment, the battery may further include a negative electrode and an electrolyte.
其中，负极同样可以为本领域常用的任意负极，比如石墨、锂、钛酸锂。Among them, the negative electrode can also be any negative electrode commonly used in this field, such as graphite, lithium, and lithium titanate.
在其中一个实施例中，电解质可以为固态电解质、半固态电解质或液态电解液，其中固态电解质和半固态电解质可以为氧化物或硫化物电解质，液态电解液中的溶质可以为六氟磷酸锂。In one embodiment, the electrolyte may be a solid electrolyte, a semi-solid electrolyte or a liquid electrolyte, wherein the solid electrolyte and the semi-solid electrolyte may be oxide or sulfide electrolytes, and the solute in the liquid electrolyte may be lithium hexafluorophosphate.
在其中一个实施例中，上述电池还可以包括隔膜，其中隔膜可以本领域公知的任意隔膜，比如，PE湿法隔膜、PP干法隔膜或双层PE/PP涂覆隔膜。In one embodiment, the battery may further include a separator, wherein the separator may be any separator known in the art, such as a PE wet separator, a PP dry separator or a double-layer PE/PP coated separator.
所述电池的形状不做限制，例如可以为圆柱形、方形，还可以为铝塑膜软包。The shape of the battery is not limited, for example, it can be cylindrical, square, or can also be an aluminum-plastic film soft package.
在其中一个实施例中，电池可以为锂离子电池。In one embodiment, the battery may be a lithium-ion battery.
本发明又一方面，还提供一种用电装置，其包括上述所述的电池。In another aspect, the present invention also provides an electrical device, which includes the above-mentioned battery.
在其中一个实施例中，用电装置的具体类型包括，但不限于移动终端(手机、移动电脑等)、智能穿戴、电动工具(电钻、电动机等)、电动汽车、移动电源等。In one embodiment, specific types of electrical devices include, but are not limited to, mobile terminals (mobile phones, mobile computers, etc.), smart wearables, power tools (electric drills, electric motors, etc.), electric vehicles, mobile power supplies, etc.
以下结合具体实施例和对比例对本发明作进一步详细的说明。The present invention will be further described in detail below with reference to specific examples and comparative examples.
实施例1Example 1
(一)多孔复合集流体的制备(1) Preparation of porous composite current collector
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属铝层，聚合物材料层300为PET薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, the polymer material layer 300 is a PET film, and the pore structure runs through the thickness direction of the porous composite current collector. Channel 400 is formed. The specific preparation steps are as follows:
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％ 的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate the first metal aluminum layer and the second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得具有孔道400的多孔复合集流体；其中，孔道400的深度为8μm、孔径为0.5mm，相邻圆孔之间的圆心距为8mm；激光打孔的波长为600nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to obtain a porous composite current collector with channels 400; wherein the depth of the channels 400 is 8 μm and the pore diameter is 0.5 mm. The center distance between adjacent circular holes is 8mm; the wavelength of laser drilling is 600nm.
测得多孔复合集流体的穿刺强度为200gf；纵向(MD)拉伸强度为210MPa，纵向(MD)延伸率为35％；横向(TD)拉伸强度为190MPa，横向(TD)延伸率为15％。The measured puncture strength of the porous composite current collector is 200gf; the longitudinal (MD) tensile strength is 210MPa, and the longitudinal (MD) elongation is 35%; the transverse (TD) tensile strength is 190MPa, and the transverse (TD) elongation is 15 %.
测得第一金属层100或第二金属层200聚合物材料层300之间的剥离力为5N/m。The peeling force between the first metal layer 100 or the second metal layer 200 and the polymer material layer 300 was measured to be 5 N/m.
(二)电池装配(2) Battery assembly
正极：由(一)中制得的多孔复合集流体及涂覆在多孔复合集流体上的磷酸铁锂活性材料组成；Positive electrode: composed of the porous composite current collector prepared in (1) and the lithium iron phosphate active material coated on the porous composite current collector;
负极：石墨；Negative electrode: graphite;
电解液：以六氟磷酸锂为溶质的液态电解液；Electrolyte: liquid electrolyte with lithium hexafluorophosphate as solute;
隔膜：聚乙烯(PE)微孔隔膜；Separator: polyethylene (PE) microporous separator;
将上述各个部件装配成型号为50Ah的磷酸铁锂电池，并进行相关性能测试，测试结果如表1所示。Assemble the above components into a 50Ah lithium iron phosphate battery, and conduct relevant performance tests. The test results are shown in Table 1.
实施例2Example 2
本实施例制备多孔复合集流体的方法与实施例1基本相同，不同之处在于：孔径为1mm。具体步骤如下：The method of preparing the porous composite current collector in this embodiment is basically the same as that in Example 1, except that the pore diameter is 1 mm. Specific steps are as follows:
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属 铝层，聚合物材料层300为PET薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, the polymer material layer 300 is a PET film, and the pore structure runs through the thickness direction of the porous composite current collector. Channel 400 is formed. The specific preparation steps are as follows:
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate a first metal aluminum layer and a second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得多孔复合集流体；其中，孔道400的深度为8μm、孔径为1mm，相邻圆孔之间的圆心距为8mm；激光打孔的波长为600nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein, the depth of the hole channel 400 is 8 μm, the aperture is 1 mm, and the adjacent circular holes are The center distance between the circles is 8mm; the wavelength of laser drilling is 600nm.
实施例3Example 3
本实施例制备多孔复合集流体的方法与实施例1基本相同，不同之处在于：相邻圆孔之间的圆心距为5mm。具体步骤如下：The method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the center distance between adjacent circular holes is 5 mm. Specific steps are as follows:
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属铝层，聚合物材料层300为PET薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, the polymer material layer 300 is a PET film, and the pore structure runs through the thickness direction of the porous composite current collector. Channel 400 is formed. The specific preparation steps are as follows:
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate a first metal aluminum layer and a second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得多孔复合集流体；其中，孔道400的深度为8μm、孔径为0.5mm，相邻圆孔之间的圆心距为5mm；激光打孔的波长为500nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 μm, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 5mm; the wavelength of laser drilling is 500nm.
实施例4Example 4
本实施例制备多孔复合集流体的方法与实施例1基本相同，不同之处在于：相邻圆孔之间的圆心距为10mm。具体步骤如下：The method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the center distance between adjacent circular holes is 10 mm. Specific steps are as follows:
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属铝层，聚合物材料层300为PET薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, the polymer material layer 300 is a PET film, and the pore structure runs through the thickness direction of the porous composite current collector. Channel 400 is formed. The specific preparation steps are as follows:
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate a first metal aluminum layer and a second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得多孔复合集流体；其中，孔道400的深度为8μm、孔径为0.5mm，相邻圆孔之间的圆心距为10mm；激光打孔的波长为600nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 μm, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 10mm; the wavelength of laser drilling is 600nm.
实施例5Example 5
本实施例制备多孔复合集流体的方法与实施例1基本相同，不同之处在于：聚合物材料层300由质量比为9:1的聚乙烯和石墨组成的导电薄膜。具体步骤如下：The method of preparing the porous composite current collector in this embodiment is basically the same as that in Embodiment 1, except that the polymer material layer 300 is made of a conductive film composed of polyethylene and graphite with a mass ratio of 9:1. Specific steps are as follows:
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属铝层，聚合物材料层300为聚乙烯和石墨(质量比为9:1)组成的导电薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, and the polymer material layer 300 is a conductive material composed of polyethylene and graphite (mass ratio is 9:1). The film and pore structure run through the thickness direction of the porous composite current collector to form pore channels 400 . The specific preparation steps are as follows:
1)在厚度为6μm的聚乙烯和石墨(质量比为9:1)组成的导电薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate the first metal aluminum layer and the second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a conductive film composed of polyethylene and graphite (mass ratio 9:1) with a thickness of 6 μm, Prepare a composite current collector with a thickness of 8 μm; the parameters of vacuum evaporation are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得多孔复合集流体；其中，孔道400的深度为8μm、孔径为0.5mm，相邻圆孔之间的圆心距为8mm；激光打孔的参数具体如下：波长为600nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to prepare a porous composite current collector; wherein the depth of the hole channel 400 is 8 μm, the aperture is 0.5 mm, and the adjacent circular holes are The center distance between the circles is 8mm; the parameters of laser drilling are as follows: the wavelength is 600nm.
对比例1Comparative example 1
本对比例与实施例1的制备方法基本相同，不同之处在于：未对集流体打孔，即未形成孔道400。具体步骤如下：The preparation method of this comparative example is basically the same as that of Example 1, except that the current collector is not perforated, that is, the holes 400 are not formed. Specific steps are as follows:
(一)复合集流体的制备(1) Preparation of composite current collector
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate a first metal aluminum layer and a second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
测得复合集流体的穿刺强度为190gf；纵向(MD)拉伸强度为220MPa，纵向(MD)延伸率为43％；横向(TD)拉伸强度为200MPa，横向(TD)延伸率为21％。The puncture strength of the composite current collector was measured to be 190gf; the longitudinal (MD) tensile strength was 220MPa, and the longitudinal (MD) elongation was 43%; the transverse (TD) tensile strength was 200MPa, and the transverse (TD) elongation was 21% .
测得第一金属层100或第二金属层200聚合物材料层300之间的剥离力为5N/m。The peeling force between the first metal layer 100 or the second metal layer 200 and the polymer material layer 300 was measured to be 5 N/m.
(二)电池装配(2) Battery assembly
正极：由(一)中制得的复合集流体及涂覆在复合集流体上的磷酸铁锂活性材料组成；Positive electrode: composed of the composite current collector prepared in (1) and the lithium iron phosphate active material coated on the composite current collector;
负极：石墨；Negative electrode: graphite;
电解液：以六氟磷酸锂为溶质的液态电解液；Electrolyte: liquid electrolyte with lithium hexafluorophosphate as solute;
隔膜：聚乙烯(PE)微孔隔膜；Separator: polyethylene (PE) microporous separator;
将上述各个部件装配成型号为50Ah的磷酸铁锂电池，并进行相关性能测 试，测试结果如表1所示。Assemble the above components into a 50Ah lithium iron phosphate battery, and conduct relevant performance tests. The test results are shown in Table 1.
对比例2Comparative example 2
本对比例与实施例1的制备方法基本相同，不同之处在于：孔径为2mm。具体步骤如下：The preparation method of this comparative example is basically the same as that of Example 1, except that the hole diameter is 2 mm. Specific steps are as follows:
(一)多孔复合集流体的制备(1) Preparation of porous composite current collector
如图1和2所示，本实施例中第一金属层100和第二金属层200均为金属铝层，聚合物材料层300为PET薄膜，孔结构贯穿于多孔复合集流体的厚度方向，形成孔道400。具体制备步骤如下：As shown in Figures 1 and 2, in this embodiment, the first metal layer 100 and the second metal layer 200 are both metal aluminum layers, the polymer material layer 300 is a PET film, and the pore structure runs through the thickness direction of the porous composite current collector. Channel 400 is formed. The specific preparation steps are as follows:
1)在厚度为6μm的PET薄膜的两面分别真空蒸镀厚度为1μm、纯度为99.9％的第一金属铝层和第二金属铝层，制备厚度为8μm的复合集流体；其中，真空蒸镀的参数具体如下：真空度为0.5×10 -2Pa，镀料温度为650℃，蒸镀速率为100m/min。 1) Vacuum evaporate a first metal aluminum layer and a second metal aluminum layer with a thickness of 1 μm and a purity of 99.9% on both sides of a PET film with a thickness of 6 μm, respectively, to prepare a composite current collector with a thickness of 8 μm; wherein, vacuum evaporation The specific parameters are as follows: vacuum degree is 0.5×10 -2 Pa, plating material temperature is 650°C, and evaporation rate is 100m/min.
2)采用激光打孔的方式在步骤1)中制得的复合集流体的厚度方向打孔，制得具有孔道400的多孔复合集流体；其中，孔道400的深度为8μm、孔径为2mm，相邻圆孔之间的圆心距为8mm；激光打孔的参数具体如下：波长为600nm。2) Use laser drilling to drill holes in the thickness direction of the composite current collector prepared in step 1) to obtain a porous composite current collector with pore channels 400; wherein the depth of the pore channels 400 is 8 μm and the pore diameter is 2 mm. The center distance between adjacent circular holes is 8mm; the parameters of laser drilling are as follows: the wavelength is 600nm.
(二)电池装配(2) Battery assembly
正极：由(一)中制得的多孔复合集流体及涂覆在多孔复合集流体上的磷酸铁锂活性材料组成；Positive electrode: composed of the porous composite current collector prepared in (1) and the lithium iron phosphate active material coated on the porous composite current collector;
负极：石墨；Negative electrode: graphite;
电解液：以六氟磷酸锂为溶质的液态电解液；Electrolyte: liquid electrolyte with lithium hexafluorophosphate as solute;
隔膜：聚乙烯(PE)微孔隔膜；Separator: polyethylene (PE) microporous separator;
将上述各个部件装配成型号为50Ah的磷酸铁锂电池，并进行相关性能测试，测试结果如表1所示。Assemble the above components into a 50Ah lithium iron phosphate battery, and conduct relevant performance tests. The test results are shown in Table 1.
性能测试：Performance Testing:
极化内阻测试、容量保持率以及充放电循环性能测试参见国标GB18287_2000，测试结果如表1所示。The polarization internal resistance test, capacity retention rate and charge and discharge cycle performance test refer to the national standard GB18287_2000, and the test results are shown in Table 1.
1)容量保持率：在25℃下，以3C倍率循环1000周，测试实施例1和对比例1～2所装配的磷酸铁锂电池的容量保持率，测试结果如表1所示；1) Capacity retention rate: Test the capacity retention rate of the lithium iron phosphate batteries assembled in Example 1 and Comparative Examples 1-2 at 25°C and 3C rate for 1000 cycles. The test results are shown in Table 1;
2)充放电循环性能测试：在容量保持率为80％时，以1C倍率充电和1C倍率放电(1C/1C)测试实施例1和对比例1～2所装配的磷酸铁锂电池的循环性能，循环周数如表1所示。2) Charge and discharge cycle performance test: When the capacity retention rate is 80%, charge at a rate of 1C and discharge at a rate of 1C (1C/1C) to test the cycle performance of the lithium iron phosphate batteries assembled in Example 1 and Comparative Examples 1 to 2 , the number of cycles is shown in Table 1.
表1Table 1
序号serial number 极化内阻(mΩ)Polarization internal resistance (mΩ) 3C容量保持率(％)3C capacity retention rate (%) 1C/1C循环(周)1C/1C cycle (week)
实施例1Example 1 22 99.599.5 18001800
对比例1Comparative example 1 66 9797 14001400
对比例2Comparative example 2 55 96.596.5 13501350
由上述测试结果可知，通过在复合集流体上设置孔结构可以使得集流体上下两层金属层的离子浓度趋于一致，从而减少了多孔复合集流体上下金属层表面的极化，提升了电池的电性能，特别是电池的内阻和倍率性能。而且进一步调控孔结构的参数，比如孔径、孔与孔之间的圆心距等可以使多孔复合集流体在具有优异力学强度的基础上，减少其极化性。而且孔径越大、孔数量越多也会降低复合集流体的强度。It can be seen from the above test results that by arranging a pore structure on the composite current collector, the ion concentration of the upper and lower metal layers of the current collector can be made consistent, thereby reducing the polarization on the surface of the upper and lower metal layers of the porous composite current collector, and improving the performance of the battery. Electrical properties, especially the internal resistance and rate performance of the battery. Furthermore, further regulating the parameters of the pore structure, such as the pore diameter and the center distance between the pores, can reduce the polarization of the porous composite current collector while having excellent mechanical strength. Moreover, larger pore diameter and more pores will also reduce the strength of the composite current collector.
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 embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above 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. 一种复合集流体，其特征在于，包括第一金属层、第二金属层和聚合物材料层，所述聚合物材料层位于所述第一金属层和所述第二金属层之间，所述复合集流体具有贯穿于所述第一金属层、所述第二金属层和所述聚合物材料层的通孔结构；所述通孔结构的孔径为0.1mm～1mm，孔隙率为0.1％～5％。A composite current collector, characterized by comprising a first metal layer, a second metal layer and a polymer material layer, the polymer material layer being located between the first metal layer and the second metal layer, so The composite current collector has a through-hole structure penetrating the first metal layer, the second metal layer and the polymer material layer; the pore diameter of the through-hole structure is 0.1 mm to 1 mm, and the porosity is 0.1%. ~5%.
  2. 根据权利要求1所述的复合集流体，其特征在于，所述通孔结构的孔径为0.5mm～1mm，孔隙率为0.1％～5％。The composite current collector according to claim 1, characterized in that the pore diameter of the through-hole structure is 0.5 mm to 1 mm, and the porosity is 0.1% to 5%.
  3. 根据权利要求1所述的复合集流体，其特征在于，所述复合集流体的厚度为2μm～28μm，其中，所述第一金属层和所述第二金属层的厚度可以分别独立地为0.5μm～1.5μm，所述聚合物材料层的厚度可以为1μm～25μm。The composite current collector according to claim 1, wherein the thickness of the composite current collector is 2 μm to 28 μm, and the thickness of the first metal layer and the second metal layer can be independently 0.5. μm～1.5 μm, and the thickness of the polymer material layer may be 1 μm～25 μm.
  4. 根据权利要求1～3任一项所述的复合集流体，其特征在于，所述聚合物材料层的材质选自绝缘聚合物材料和无机非导电填料形成的复合物、绝缘聚合物材料和导电填料形成的复合物、绝缘聚合物材料或导电聚合物材料，其中，所述绝缘聚合物材料和无机非导电填料形成的复合物中所述绝缘聚合物材料的质量百分比≥90％，所述绝缘聚合物材料和导电填料形成的复合物中所述绝缘聚合物材料的质量百分比≥90％。The composite current collector according to any one of claims 1 to 3, characterized in that the material of the polymer material layer is selected from the group consisting of a composite of insulating polymer materials and inorganic non-conductive fillers, insulating polymer materials and conductive fillers. A composite formed by a filler, an insulating polymer material or a conductive polymer material, wherein the mass percentage of the insulating polymer material in the composite formed by the insulating polymer material and the inorganic non-conductive filler is ≥90%, and the insulation The mass percentage of the insulating polymer material in the composite formed by the polymer material and the conductive filler is ≥90%.
  5. 根据权利要求4所述的复合集流体，其特征在于，所述绝缘聚合物材料选自纤维素及其衍生物、淀粉及其衍生物、蛋白质及其衍生物、聚乙烯醇及其交联聚合物、聚乙二醇及其交联聚合物、聚酰胺、聚对苯二甲酸酯、聚酰亚胺、聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、芳纶、聚二甲酰苯二胺、丙烯腈-丁二烯-苯乙烯共聚物、聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚对苯二甲酰对苯二胺、聚丙乙烯、聚甲醛、环氧树脂、酚醛树脂、聚四氟乙烯、聚偏氟乙烯、硅橡胶及聚碳酸酯中的一种或多种；和/或The composite current collector according to claim 4, wherein the insulating polymer material is selected from the group consisting of cellulose and its derivatives, starch and its derivatives, protein and its derivatives, polyvinyl alcohol and its cross-linked polymerization Polyethylene glycol and its cross-linked polymers, polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid, polydiformyl Phenylenediamine, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polybutylene terephthalate, poly-p-phenylene terephthalamide, polypropylene, One or more of polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber and polycarbonate; and/or
    所述导电聚合物材料选自掺杂聚氮化硫和/或掺杂聚乙炔；和/或The conductive polymer material is selected from doped polysulfide nitride and/or doped polyacetylene; and/or
    所述无机非导电填料选自陶瓷材料、玻璃材料及陶瓷复合材料中的一种或多种；和/或The inorganic non-conductive filler is selected from one or more of ceramic materials, glass materials and ceramic composite materials; and/or
    所述导电填料选自碳黑、碳纳米管、石墨、乙炔黑、石墨烯、镍、铁、铜、铝、合金、镍包覆的石墨粉及镍包覆的碳纤维中的一种或多种。The conductive filler is selected from one or more of carbon black, carbon nanotubes, graphite, acetylene black, graphene, nickel, iron, copper, aluminum, alloy, nickel-coated graphite powder and nickel-coated carbon fiber. .
  6. 一种如权利要求1～5任一项所述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 composite current collector according to any one of claims 1 to 5, characterized in that it includes the following steps:
    在所述聚合物材料层的两面分别形成所述第一金属层和所述第二金属层，并按照所述通孔结构的分布原则打孔贯穿所述聚合物材料层、所述第一金属层和所述第二金属层。The first metal layer and the second metal layer are respectively formed on both sides of the polymer material layer, and holes are drilled through the polymer material layer and the first metal layer according to the distribution principle of the through hole structure. layer and the second metal layer.
  7. 根据权利要求6所述的复合集流体的制备方法，其特征在于，所述镀覆的方法为真空蒸镀，和/或所述打孔的方法为激光打孔；The method for preparing a composite current collector according to claim 6, wherein the plating method is vacuum evaporation, and/or the drilling method is laser drilling;
    可选地，所述真空蒸镀的镀料蒸发温度为600℃～1600℃，真空度＜1×10 -2Pa，蒸镀速率为10m/min～100m/min； Optionally, the evaporation temperature of the plating material for vacuum evaporation is 600°C to 1600°C, the vacuum degree is <1×10 -2 Pa, and the evaporation rate is 10m/min to 100m/min;
    可选地，所述激光打孔的波长为400nm～700nm。Optionally, the wavelength of the laser drilling is 400nm ~ 700nm.
  8. 一种正极，其特征在于，包括权利要求1～5任一项所述的复合集流体及位于所述复合集流体表面的正极活性材料层。A positive electrode, characterized by comprising the composite current collector according to any one of claims 1 to 5 and a positive electrode active material layer located on the surface of the composite current collector.
  9. 一种电池，其特征在于，包括权利要求8所述的正极。A battery, characterized by comprising the positive electrode according to claim 8.
  10. 一种用电装置，其特征在于，包括权利要求9所述的电池。An electrical device, characterized by comprising the battery according to claim 9.
PCT/CN2022/105792 2022-07-14 2022-07-14 Composite current collector, and preparation method therefor and application thereof WO2024011529A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120315537A1 (en) * 2011-06-10 2012-12-13 Yardney Technical Products Inc. Composite current collector, methods of manufacture thereof, and articles including the same
CN108281662A (en) * 2017-01-12 2018-07-13 宁德时代新能源科技股份有限公司 Current collector, pole piece and battery thereof and application
CN109994740A (en) * 2019-03-29 2019-07-09 宁德新能源科技有限公司 Composite current collector and composite pole piece and electrochemical appliance comprising it
CN110247056A (en) * 2018-03-30 2019-09-17 宁德时代新能源科技股份有限公司 Current collector, pole piece thereof and electrochemical device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120315537A1 (en) * 2011-06-10 2012-12-13 Yardney Technical Products Inc. Composite current collector, methods of manufacture thereof, and articles including the same
CN108281662A (en) * 2017-01-12 2018-07-13 宁德时代新能源科技股份有限公司 Current collector, pole piece and battery thereof and application
CN110247056A (en) * 2018-03-30 2019-09-17 宁德时代新能源科技股份有限公司 Current collector, pole piece thereof and electrochemical device
CN109994740A (en) * 2019-03-29 2019-07-09 宁德新能源科技有限公司 Composite current collector and composite pole piece and electrochemical appliance comprising it

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