CN218939731U - Corrosion-resistant flexible current collector - Google Patents
Corrosion-resistant flexible current collector Download PDFInfo
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- CN218939731U CN218939731U CN202223042197.4U CN202223042197U CN218939731U CN 218939731 U CN218939731 U CN 218939731U CN 202223042197 U CN202223042197 U CN 202223042197U CN 218939731 U CN218939731 U CN 218939731U
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- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 105
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 52
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000010949 copper Substances 0.000 claims abstract description 33
- 229910052802 copper Inorganic materials 0.000 claims abstract description 33
- 239000002985 plastic film Substances 0.000 claims abstract description 31
- 229920006255 plastic film Polymers 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 171
- 239000012790 adhesive layer Substances 0.000 claims description 17
- -1 polyethylene terephthalate Polymers 0.000 claims description 11
- 229920002120 photoresistant polymer Polymers 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 32
- 229910052751 metal Inorganic materials 0.000 abstract description 32
- 239000000853 adhesive Substances 0.000 abstract description 18
- 230000001070 adhesive effect Effects 0.000 abstract description 18
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 230000007704 transition Effects 0.000 abstract description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 14
- 229910052744 lithium Inorganic materials 0.000 description 14
- 238000005452 bending Methods 0.000 description 10
- 238000007747 plating Methods 0.000 description 10
- 239000011889 copper foil Substances 0.000 description 6
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- 230000001788 irregular Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
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- 238000011161 development Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 229910001096 P alloy Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
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- 239000002923 metal particle Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 239000004713 Cyclic olefin copolymer Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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- 230000008020 evaporation Effects 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 210000000438 stratum basale Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Cell Electrode Carriers And Collectors (AREA)
Abstract
The utility model discloses a corrosion-resistant flexible current collector, which comprises a plastic film substrate layer; the upper and lower side surfaces of the plastic film substrate layer are respectively provided with an organic bonding layer, a nickel layer and a copper layer in sequence; the nickel layer is partially embedded in the organic bonding layer to form a transitional permeation layer between the organic bonding layer and the nickel layer. According to the corrosion-resistant flexible current collector, the organic bonding layer with reasonable thickness is arranged, the organic bonding layer has good adhesive force with the organic film material, the metal layer is in a nickel layer and copper layer double-layer structure, the metal nickel layer is arranged on one side close to the organic bonding layer, the corrosion resistance of the negative current collector to electrolyte is more effectively improved, and the transition permeation layer is formed between the organic bonding layer and the conductive metal nickel layer, so that the plastic film substrate layer and the conductive metal layer have good adhesive force.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a corrosion-resistant flexible current collector.
Background
Along with the strategic measures of coping with climate change and promoting green development, lithium batteries are widely researched as important energy storage devices, and the aim of realizing high capacity, light weight and thin type of lithium batteries and ensuring the safety of the lithium batteries is always industry. Current collectors used in lithium batteries have also been developed toward high conductivity, flexibility, thinness, high stability, and low cost.
The traditional negative electrode current collector uses copper foil which has good conductivity, the thickness of the copper foil is gradually reduced from 8um to 4.5um in order to conform to the development direction of a lithium battery, the mechanical performance of the copper foil is poorer along with the reduction of the thickness, and defects such as bulges, holes, even cracks and the like are easily generated in the coating and rolling preparation processes of the battery, so that the safety performance of the battery is influenced, and the manufacturing cost is higher.
The current emerging corrosion-resistant flexible current collector uses an organic film material as a supporting layer, and the light and thin performance and mechanical toughness of the current collector are improved by preparing a conductive layer on the surface of the current collector, but in the current technology, the conductive layer is usually prepared by using a vacuum sputtering or evaporation mode, so that the current technology has the defects of relatively high equipment cost, high cost, low production efficiency and unfavorable large-area production, and the problems of poor conductive performance and poor adhesive force when the conductive layer is relatively thin are generally existed. Another common solution involves degreasing and etching the applied organic film material, and then pre-impregnating the electroless plating catalyst with a colloidal solution containing a metal catalyst, further applying a metal layer, but this approach has problems of poor plating uniformity and poor plating adhesion due to insufficient catalyst penetration. Through setting up the organic tie coat of reasonable thickness, organic tie coat and organic film material (plastic film stratum basale) have better adhesive force to form the transition permeable layer between organic tie coat and conductive metal layer, good solution copper layer and the relatively poor problem of organic film material adhesive force, but when being applied to lithium cell structure, the negative pole current collector of preparation in this kind of structure is because copper layer lattice is great, and electrolyte can permeate the copper layer and erode organic tie coat in the long-term use, thereby leads to the adhesive force of metal layer to descend.
Based on the above situation, the utility model provides a flexible current collector which is applied to a lithium battery and resistant to electrolyte corrosion, and the problems can be effectively solved.
Disclosure of Invention
The utility model aims to provide a flexible current collector resistant to electrolyte corrosion. According to the corrosion-resistant flexible current collector, the organic bonding layer with reasonable thickness is arranged, the organic bonding layer has good adhesive force with an organic film material (a plastic film substrate layer), the metal layer is of a nickel layer and copper layer double-layer structure, the metal nickel layer is arranged on one side close to the organic bonding layer, the corrosion resistance of the negative current collector to electrolyte is improved more effectively, and the transition permeation layer is formed between the organic bonding layer and the conductive metal nickel layer, so that the plastic film substrate layer and the conductive metal layer have good adhesive force.
In addition, the plastic film substrate layer is used as a supporting layer, so that the copper foil with the same thickness has better light and thin property, and the organic film material has better bending property and mechanical strength, so that the copper current collector carrying the organic film also has better bending property and mechanical strength; the current collector has better conductivity and better uniformity.
The utility model is realized by the following technical scheme:
a corrosion-resistant flexible current collector,
the corrosion resistant flexible current collector comprises a plastic film base layer;
the upper and lower side surfaces of the plastic film substrate layer are respectively provided with an organic bonding layer, a nickel layer and a copper layer in sequence; the nickel layer is partially embedded in the organic bonding layer to form a transitional permeation layer between the organic bonding layer and the nickel layer.
According to the corrosion-resistant flexible current collector, the organic bonding layer with reasonable thickness is arranged, the organic bonding layer has good adhesive force with the organic film material, the metal layer is in a nickel layer and copper layer double-layer structure, the metal nickel layer is arranged on one side close to the organic bonding layer, the corrosion resistance of the negative current collector to electrolyte is more effectively improved, and the transition permeation layer is formed between the organic bonding layer and the conductive metal nickel layer, so that the plastic film substrate layer and the conductive metal layer have good adhesive force.
In addition, the plastic film substrate layer is used as a supporting layer, so that the copper foil with the same thickness has better light and thin property, and the organic film material has better bending property and mechanical strength, so that the copper current collector carrying the organic film also has better bending property and mechanical strength; the current collector has better conductivity and better uniformity.
The basic structure of the corrosion-resistant flexible current collector is conductive metal layers applied on the upper surface and the lower surface of the plastic film substrate layer, so that the light and thin properties, bending resistance and good mechanical strength of the corrosion-resistant flexible current collector are maintained.
Preferably, the thickness of the organic adhesive layer is D1, the thickness of the transitional permeable layer is D2, and the number relationship is satisfied: 10% D1 < D2 < 50% D1.
The inventors have found through a number of experiments that the thickness of the organic adhesive layer 20 is D1, the thickness of the transitional permeable layer 30 is D2, and the number relationship is satisfied: the adhesive force is better when the D1 is more than 10 percent and the D2 is less than 50 percent.
In the flexible current collector structure, the key point of obtaining good adhesive force is that the ratio of the transitional permeation layer to the organic adhesive layer is that when the thickness of the embedded layer is thinner or 0, the metal conductive layer has a risk of falling off relative to the organic adhesive layer, when the thickness of the embedded layer is higher, the strength of the organic adhesive layer can be reduced, the metal conductive layer is attached with the embedded layer to have a risk of falling off, and a large number of experiments of test personnel prove that the ratio can obtain the best adhesive force when the ratio is between 10 and 50 percent.
Preferably, the thickness of the organic adhesive layer is D1, the thickness of the transitional permeable layer is D2, and the number relationship is satisfied: 25% D1 < D2 < 40% D1.
Preferably, the thickness of the plastic film substrate layer is 1-25um.
Preferably, the plastic film substrate layer is made of polyethylene terephthalate, polypropylene or polyimide.
Preferably, the thickness of the organic adhesive layer is 100 to 2000nm.
Preferably, the material of the organic bonding layer is photoresist or thermal photoresist.
The total thickness of the nickel layer and the copper layer is 700-2000 nm.
Wherein the nickel layer has a thickness of 200-400nm, and wherein the nickel layer does not include the thickness of the transitional permeable layer.
The conductive metal layer is copper metal, the negative electrode current collector has good conductivity, but because the copper layer has larger crystal lattice, electrolyte can erode organic bonding through the metal copper layer when the conductive metal layer is used as the negative electrode current collector in a lithium battery for a long time, and the nickel metal layer is added in the time of the organic bonding layer and the copper layer, so that the corrosion resistance of the negative electrode current collector can be effectively improved, but the conductivity of nickel is poorer than that of the copper metal layer, so that the conductive metal layer is applied by 200-400nm, and good corrosion resistance and good conductivity can be obtained.
More preferably, the nickel layer is made of nickel alloy, for example, the nickel layer obtained by chemical nickel plating is made of nickel-phosphorus alloy.
Preferably, the surface of the copper layer is of a non-planar structure, and the surface roughness Sa is 60nm-1000nm.
The "surface roughness Sa" of the present utility model was measured by a confocal microscope.
The corrosion-resistant flexible current collector maintains the advantages of good conductivity, bending property and mechanical strength of the corrosion-resistant flexible current collector, has larger specific surface area and roughness on the surface, has good binding force with active substances, further increases the effective contact between the current collector and the active substances, reduces the internal resistance, and has better multiplying power characteristics. And the lithium battery prepared based on the corrosion-resistant flexible current collector has higher energy density and better cycle stability.
The corrosion-resistant flexible current collector provided by the utility model has higher and controllable roughness on the surface, and has better adhesive force with the negative electrode active material, and the lithium battery based on the corrosion-resistant flexible current collector has smaller internal contact resistance and better multiplying power characteristic.
Preferably, the non-planar structure is formed of a regular or irregular concave hemispherical shape, a concave prismatic shape, or a concave triangular prism shape, or a regular or irregular convex hemispherical shape, a convex prismatic shape, or a convex triangular prism shape.
Preferably, the distance between the lowest position and the highest position of the surface of the conductive metal layer along the direction perpendicular to the plastic film substrate layer is 150nm-1000nm.
The corrosion-resistant flexible current collector provided by the utility model has a larger and controllable surface area, the area of the current collector unit with the same size and the active material is larger, and the rugged surface structure and the vertical gaps can eliminate the stress change of the battery caused by the volume change in the charging and discharging process, so that the cycle stability and the service life of the lithium battery are improved.
Compared with the prior art, the utility model has the following advantages:
according to the corrosion-resistant flexible current collector, the organic bonding layer with reasonable thickness is arranged, the organic bonding layer has good adhesive force with the organic film material, the metal layer is in a nickel layer and copper layer double-layer structure, the metal nickel layer is arranged on one side close to the organic bonding layer, the corrosion resistance of the negative current collector to electrolyte is more effectively improved, and the transition permeation layer is formed between the organic bonding layer and the conductive metal nickel layer, so that the plastic film substrate layer and the conductive metal layer have good adhesive force. In addition, the plastic film substrate layer is used as a supporting layer, so that the copper foil with the same thickness has better light and thin property, and the organic film material has better bending property and mechanical strength, so that the copper current collector carrying the organic film also has better bending property and mechanical strength; the current collector has better conductivity and better uniformity.
The corrosion-resistant flexible current collector maintains the advantages of good conductivity, bending property and mechanical strength of the corrosion-resistant flexible current collector, has larger specific surface area and roughness on the surface, has good binding force with active substances, further increases the effective contact between the current collector and the active substances, reduces the internal resistance, and has better multiplying power characteristics. And the lithium battery prepared based on the corrosion-resistant flexible current collector has higher energy density and better cycle stability.
The basic structure of the corrosion-resistant flexible current collector is conductive metal layers applied on the upper surface and the lower surface of the plastic film substrate layer, so that the light and thin properties, bending resistance and good mechanical strength of the corrosion-resistant flexible current collector are maintained.
The corrosion-resistant flexible current collector provided by the utility model has higher and controllable roughness on the surface, and has better adhesive force with the negative electrode active material, and the lithium battery based on the corrosion-resistant flexible current collector has smaller internal contact resistance and better multiplying power characteristic.
The corrosion-resistant flexible current collector provided by the utility model has a larger and controllable surface area, the area of the current collector unit with the same size and the active material is larger, and the rugged surface structure and the vertical gaps can eliminate the stress change of the battery caused by the volume change in the charging and discharging process, so that the cycle stability and the service life of the lithium battery are improved.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present utility model, preferred embodiments of the present utility model will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1, a corrosion resistant flexible current collector includes a plastic film base layer 10; the upper and lower surfaces of the plastic film substrate layer 10 are sequentially provided with an organic adhesive layer 20, a nickel layer 40 and a copper layer 50; the nickel layer 40 is partially embedded in the organic bonding layer 20 to form the transitional permeation layer 30 between the organic bonding layer 20 and the nickel layer 40.
Example 2:
as shown in fig. 1, a corrosion resistant flexible current collector,
the corrosion resistant flexible current collector comprises a plastic film base layer 10;
the upper and lower surfaces of the plastic film substrate layer 10 are sequentially provided with an organic adhesive layer 20, a nickel layer 40 and a copper layer 50; the nickel layer 40 is partially embedded in the organic bonding layer 20 to form the transitional permeation layer 30 between the organic bonding layer 20 and the nickel layer 40.
In practice, the transition permeation layer 30 and the nickel layer 40 and the copper layer 50 may be formed by performing double-sided coating of the organic adhesive layer 40, double-sided gray exposure, wet development, electroless copper plating on the plastic film base layer 10 through a coating process; the transition permeation layer 30, that is, part of the metal particles grow in the organic adhesive layer 40 during electroless copper plating, and belongs to a region where the mixed organic adhesive and the metal particles coexist and bond.
For example, electroless nickel may be performed for 100-200nm to form an embedded layer and a copper seed layer (nickel layer 40), followed by electroplating the copper layer to a target thickness.
Specifically, electroless nickel plating is performed by subjecting the cured product of the organic adhesive layer 40 to electroless nickel plating at 26-49 (e.g., 38) deg.c and ph=8.8-9.2 (e.g., 9) for 2-8min to complete the preparation of the double-sided metallic nickel layer, and forming and plating the copper seed layer (nickel layer 40) and the embedded layer.
The chemical nickel plating solution comprises the following components: 16-25g/L (such as 20) of nickel sulfate, 20-25g/L (such as 21) of sodium hypophosphite and 38-42g/L (such as 40) of citric acid amine.
Further, in another embodiment, the thickness of the organic adhesive layer 20 is D1, the thickness of the transitional permeable layer 30 is D2, and the number relationship is satisfied: 10% D1 < D2 < 50% D1.
Further, in another embodiment, the thickness of the organic adhesive layer 20 is D1, the thickness of the transitional permeable layer 30 is D2, and the number relationship is satisfied: 25% D1 < D2 < 40% D1.
Further, in another embodiment, the plastic film base layer 10 has a thickness of 1-25um.
Further, in another embodiment, the plastic film base layer 10 is made of polyethylene terephthalate, polypropylene or polyimide.
In practical applications, the plastic film substrate layer 10 may be made of polycarbonate, polyethylene naphthalate, polymethyl methacrylate, polybutylene terephthalate, polyethylene, polyvinyl chloride, polystyrene or polydimethylsiloxane, cyclic olefin copolymer, cyclic olefin polymer, or ABS resin, and may be selected by those skilled in the art according to requirements.
Further, in another embodiment, the thickness of the organic adhesive layer 20 is 100 to 2000nm.
Further, in another embodiment, the material of the organic adhesive layer 20 is photoresist or thermal photoresist.
In practical applications, the photoresist or the thermal photoresist may be selected from aromatic acrylic acid oligomer, polyester acrylate oligomer, epoxy acrylate oligomer, silicone modified acrylate oligomer or polyurethane acrylate oligomer, which can be selected by those skilled in the art according to the needs.
Further, in another embodiment, the total thickness of the nickel layer 40 and the copper layer 50 is 700 to 2000nm.
In particular, the nickel layer may have a thickness of 200-400nm, and the nickel layer does not include a thickness of the transition permeation layer.
Specifically, the nickel layer is made of nickel alloy, for example, the nickel layer obtained by chemical nickel plating is made of nickel-phosphorus alloy.
Further, in another embodiment, the surfaces of the nickel layer 40 and the copper layer 50 are non-planar structures, and the surface roughness Sa is 60nm to 1000nm.
Further, in another embodiment, the non-planar structure is constituted by a regular or irregular concave hemispherical shape, a concave prismatic shape, or a concave triangular prism shape, or is constituted by a regular or irregular convex hemispherical shape, a convex prismatic shape, or a convex triangular prism shape.
Further, in another embodiment, the surfaces of the nickel layer 40 and the copper layer 50 are located at a distance of 150nm to 1000nm from the lowest point 41 to the highest point 42 in a direction perpendicular to the plastic film base layer 10.
Unless specifically stated otherwise, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present utility model and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present utility model are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The above description is merely of the preferred embodiments of the present utility model, and the present utility model is not limited in any way, but any simple modification and equivalent changes of the above embodiments according to the technical matters of the present utility model fall within the scope of the present utility model 。
Claims (10)
1. A corrosion resistant flexible current collector, characterized by:
the corrosion resistant flexible current collector comprises a plastic film base layer (10);
an organic bonding layer (20), a nickel layer (40) and a copper layer (50) are sequentially arranged on the upper side surface and the lower side surface of the plastic film substrate layer (10); the nickel layer (40) is partially embedded in the organic bonding layer (20) to form a transitional permeation layer (30) between the organic bonding layer (20) and the nickel layer (40).
2. The corrosion resistant flexible current collector of claim 1, wherein: the thickness of the organic bonding layer (20) is D1, the thickness of the transitional permeation layer (30) is D2, and the number relation is satisfied: 10% D1 < D2 < 50% D1.
3. The corrosion resistant flexible current collector of claim 2, wherein: the thickness of the organic bonding layer (20) is D1, the thickness of the transitional permeation layer (30) is D2, and the number relation is satisfied: 25% D1 < D2 < 40% D1.
4. The corrosion resistant flexible current collector of claim 1, wherein: the thickness of the plastic film base layer (10) is 1-25um.
5. The corrosion resistant flexible current collector of claim 1, wherein: the plastic film substrate layer (10) is made of polyethylene terephthalate, polypropylene or polyimide.
6. The corrosion resistant flexible current collector of claim 1, wherein: the thickness of the organic adhesive layer (20) is 50-2000 nm.
7. The corrosion resistant flexible current collector of claim 1, wherein: the material of the organic bonding layer (20) is photoresist or thermal photoresist.
8. The corrosion resistant flexible current collector of claim 1, wherein: the total thickness of the nickel layer (40) and the copper layer (50) is 750-2000 nm.
9. The corrosion resistant flexible current collector of claim 8, wherein: the thickness of the nickel layer is 100-500 nm.
10. A corrosion resistant flexible current collector according to any of claims 1 to 9, wherein: the surface of the copper layer (50) is of a non-planar structure, and the surface roughness Sa is 60nm-1000nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223042197.4U CN218939731U (en) | 2022-11-16 | 2022-11-16 | Corrosion-resistant flexible current collector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223042197.4U CN218939731U (en) | 2022-11-16 | 2022-11-16 | Corrosion-resistant flexible current collector |
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| CN218939731U true CN218939731U (en) | 2023-04-28 |
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2022
- 2022-11-16 CN CN202223042197.4U patent/CN218939731U/en active Active
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