CN220731566U - Current collector of lithium battery - Google Patents
Current collector of lithium battery Download PDFInfo
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- CN220731566U CN220731566U CN202320766080.6U CN202320766080U CN220731566U CN 220731566 U CN220731566 U CN 220731566U CN 202320766080 U CN202320766080 U CN 202320766080U CN 220731566 U CN220731566 U CN 220731566U
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- Prior art keywords
- current collector
- layer
- lithium battery
- nano
- metal particles
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 34
- 239000010410 layer Substances 0.000 claims abstract description 77
- 229910002065 alloy metal Inorganic materials 0.000 claims abstract description 39
- 239000002923 metal particle Substances 0.000 claims abstract description 37
- 239000002121 nanofiber Substances 0.000 claims abstract description 33
- 239000012790 adhesive layer Substances 0.000 claims abstract description 31
- 229920006254 polymer film Polymers 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- 239000002134 carbon nanofiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 4
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 4
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 4
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 4
- 239000004417 polycarbonate Substances 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 238000002207 thermal evaporation Methods 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 238000009713 electroplating Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000010884 ion-beam technique Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 229910000743 fusible alloy Inorganic materials 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000007772 electrode material Substances 0.000 abstract description 3
- 239000011889 copper foil Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JWVAUCBYEDDGAD-UHFFFAOYSA-N bismuth tin Chemical compound [Sn].[Bi] JWVAUCBYEDDGAD-UHFFFAOYSA-N 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
Landscapes
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The utility model discloses a lithium battery current collector which comprises a polymer film layer, wherein one or two sides of the polymer film layer are provided with a glue layer embedded with nano fibers and nano alloy metal particles, and a conductive layer arranged on the surface of the glue layer. The nano fibers and nano alloy metal particles are partially embedded in the adhesive layer, and partially exposed on the surface of the adhesive layer; the cross-longitudinal staggered distribution is embedded in the adhesive layer to form a random distribution network structure, and the duty ratio of the nano fibers and the nano alloy metal particles in the adhesive layer is 10% -50%. The cross stretching force of the polymer film layer can be effectively increased due to the staggered net structure formed by the nanofibers embedded in the adhesive layer, the situation that the material is pulled apart due to embrittlement when the material is subjected to multiple high temperatures is effectively avoided, meanwhile, the nanometer alloy metal particles can effectively polymerize the conductive layer with the adhesive layer, the adhesive force of the conductive layer is further increased, and the adhesiveness of the electrode material and the current collector is ensured.
Description
Technical Field
The utility model relates to the field of lithium batteries, in particular to a lithium battery current collector.
Background
High conductivity, high strength, high flexibility and ultra-thin current collectors are the trend of current collectors for lithium batteries in the future. The positive and negative current collectors of the lithium battery commonly used at present mainly comprise an extension copper foil, an electrolytic copper foil and an extension aluminum foil; the copper foil and the aluminum foil are rolled into 10-16 mu m, but the copper foil and the aluminum foil are difficult to thin continuously, so that the quality of a finished product cannot be further improved; the electrolytic copper solution can be used for mass production of copper foil with the thickness of 6-8um, but the electrolytic characteristic can cause overlarge surface roughness on two sides of the copper foil, additional surface treatment procedures are required to be added, and the treatment process of the electrolytic solution is easy to cause additional pollution, so that the whole process is too complex; particularly for processes in which the positive and negative current collectors are integrated, this is more difficult to achieve due to the incomplete compatibility of the electrolyte with metals of opposite polarity.
In order to reduce the weight of the current collector and realize integration of the positive and negative current collectors, in the prior art, a copper film or an aluminum film is deposited on the surface of a flexible substrate such as PET by vapor deposition or PVD, but the PET material can deform and deform under repeated high temperature (during film coating and baking after coating), and is easily torn in the production process of the lithium battery, so the prior art has the defects.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides the lithium battery current collector, which effectively increases the transverse tensile strength of the lithium battery current collector based on the flexible substrate, avoids the defect caused by the tearing of the lithium battery current collector in the production process, and simultaneously effectively increases the adhesive force of a copper film or an aluminum film.
In order to achieve the above purpose, the present utility model adopts the following design scheme:
the lithium battery current collector is characterized by comprising a polymer film layer, wherein one or two sides of the polymer film layer are provided with a glue layer embedded with nano fibers and nano alloy metal particles, and a conductive layer arranged on the surface of the glue layer.
The thickness of the adhesive layer embedded with the nano fibers and the nano alloy metal particles is 0.5-1um; the nano fibers and nano alloy metal particles are partially embedded in the adhesive layer, and the nano fibers and nano alloy metal particles are partially exposed on the surface of the adhesive layer; the transverse and longitudinal staggered distribution is inlaid in the adhesive layer to form a randomly distributed reticular structure.
The duty ratio of the nano fibers and the nano alloy metal particles in the adhesive layer is 10% -50%.
The nanofiber is one of carbon nanofiber and carbon nanofiber; the length of the fiber is 20-30um, and the diameter of the fiber cross section is 10-80nm.
The nano alloy metal particles are oxidation-resistant and low-melting-point alloy metal.
The grain diameter of the nano alloy metal particles is 30-40nm.
The conductive layer is one or more of aluminum, copper, aluminum alloy and silver, and the thickness is 100-2000nm.
The conductive layer is formed by one or two of magnetron sputtering, electroplating, thermal evaporation and ion beam evaporation.
The polymer film layer is one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride and polytetrafluoroethylene.
And a connecting layer is arranged between the conducting layer and the adhesive layer.
The connecting layer is one or more of metal nickel, titanium, copper, aluminum or titanium nitride; the thickness is 10-100nm.
The lithium battery current collector is an anode current collector or a cathode current collector.
The utility model adopts the technical proposal and has the beneficial effects that:
1) Through setting up the glue film that inlays nanofiber and nano alloy metal particle at the polymerization rete surface, because of nanofiber horizontal and vertical crisscross distributed's network structure can effectually increase the horizontal tensile force of polymer rete, can effectively avoid the lithium cell current collector based on it to be pulled out because of the embrittlement when passing a lot of high temperature.
2) Because the nano alloy metal particles embedded in the adhesive layer are partially embedded in the adhesive layer and partially exposed, the nano alloy metal particles are partially melted to polymerize the conductive layer with the adhesive layer when the conductive layer is deposited due to the lower melting point, so that the adhesive force of the conductive layer is further increased, and the adhesive property of the electrode material and the polymer film layer is ensured.
Drawings
The utility model is further described below with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of a lithium battery current collector according to embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of a lithium battery current collector without a conductive layer in embodiment 1 of the present utility model;
fig. 3 is a schematic cross-sectional view of a lithium battery current collector of example 1 of the present utility model;
fig. 4 is a schematic cross-sectional view of a lithium battery current collector of example 2 of the present utility model;
fig. 5 is a schematic cross-sectional view of a lithium battery current collector of example 3 of the present utility model;
fig. 6 is a schematic cross-sectional view of a lithium battery current collector of example 4 of the present utility model.
Description of the embodiments
The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The utility model provides a lithium battery current collector which comprises a polymer film layer, wherein one or two sides of the polymer film layer are provided with a glue layer embedded with nano fibers and nano alloy metal particles, and a conductive layer arranged on the surface of the glue layer.
The thickness of the adhesive layer embedded with the nano fibers and the nano alloy metal particles is 0.5-1um; the nano fibers and nano alloy metal particles are partially embedded in the adhesive layer, and the nano fibers and nano alloy metal particles are partially exposed on the surface of the adhesive layer; the transverse and longitudinal staggered distribution is inlaid in the adhesive layer to form a randomly distributed reticular structure. The duty ratio of the nano fibers and the nano alloy metal particles in the adhesive layer is 10% -50%. The nanofiber is one of carbon nanofiber and carbon nanofiber; the length of the fiber is 20-30um, and the diameter of the fiber cross section is 10-80nm. The nano alloy metal particles are oxidation-resistant and low-melting-point alloy metal. The grain diameter of the nano alloy metal particles is 30-40nm.
The conductive layer is one or more of aluminum, copper, aluminum alloy and silver, and the thickness is 100-2000nm. The conductive layer is formed by one or two of magnetron sputtering, electroplating, thermal evaporation and ion beam evaporation.
The polymer film layer is one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride and polytetrafluoroethylene.
And a connecting layer is arranged between the conducting layer and the adhesive layer. The connecting layer is one or more of metal nickel, titanium, copper, aluminum or titanium nitride; the thickness is 10-100nm.
Examples
As shown in fig. 1-3, the lithium battery current collector comprises a polymer film layer 1, wherein one surface of the polymer film layer 1 is provided with a glue layer 2 inlaid with nano fibers 2-1 and nano alloy metal particles 2-2, and a conductive layer 3 arranged on the surface of the glue layer 2.
The thickness of the adhesive layer 2 inlaid with the nanofiber 2-1 and the nano alloy metal particles 2-2 is 1um; the nanofiber 2-1 and the nano alloy metal particles 2-2 are partially embedded in the adhesive layer, and partially exposed on the surface of the adhesive layer; the nano fibers 2-1 and the nano alloy metal particles 2-2 are embedded in the adhesive layer in a staggered manner in the transverse and longitudinal directions to form a random network structure, and the duty ratio of the nano fibers and the nano alloy metal particles in the adhesive layer is 10% -50%. The nanofiber 2-1 is one of carbon nanofibers; the length of the fiber is 20-30um, and the diameter of the fiber cross section is 10-80nm. The nano alloy metal particles 2-2 are oxidation-resistant and low-melting-point tin-bismuth alloy particles with the particle size of 30-40nm.
The conductive layer 2 is one or more of aluminum, copper, aluminum alloy and silver, and has a thickness of 100-2000nm. The conductive layer is formed by magnetron sputtering and thermal evaporation coating. The polymer film layer 1 is one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride and polytetrafluoroethylene.
Examples
As shown in fig. 4, a connection layer 4 is further provided between the conductive layer 3 and the adhesive layer 2, unlike in embodiment 1. The connecting layer is one or more of metal nickel, titanium, copper, aluminum or titanium nitride; the thickness is 10-100nm.
Examples
As shown in fig. 5, unlike example 1, a glue layer 2 in which nanofibers 2-1 and nano alloy metal particles 2-2 are embedded and a conductive layer 3 provided on the surface of the glue layer 2 are provided on both sides of a polymer film layer 1.
Examples
As shown in fig. 6, unlike example 2, a glue layer 2 in which nanofibers 2-1 and nano alloy metal particles 2-2 are embedded, a conductive layer 3 provided on the surface of the glue layer 2, and a connection layer 4 provided between the conductive layer 3 and the glue layer 2 are provided on both sides of the polymer film layer 1.
Unlike example 1, a glue layer 2 embedded with nanofibers 2-1 and nano alloy metal particles 2-2 and a conductive layer 3 provided on the surface of the glue layer 2 are provided on both sides of the polymer film layer 1.
By adopting the technical scheme, the transverse tensile force of the polymer film layer can be effectively increased, and the situation that the material is pulled apart due to embrittlement when the lithium battery current collector based on the transverse tensile force passes through high temperatures for many times can be effectively avoided; meanwhile, the adhesive force of the conductive layer can be further increased, and the adhesion of the electrode material and the polymer film layer is ensured.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The lithium battery current collector is characterized by comprising a polymer film layer, wherein one or two sides of the polymer film layer are provided with a glue layer embedded with nano fibers and nano alloy metal particles, and a conductive layer arranged on the surface of the glue layer.
2. The lithium battery current collector according to claim 1, wherein the thickness of the adhesive layer inlaid with the nanofibers and the nano alloy metal particles is 0.5-1um; the nano fibers and nano alloy metal particles are partially embedded in the adhesive layer, and the nano fibers and nano alloy metal particles are partially exposed on the surface of the adhesive layer; the transverse and longitudinal staggered distribution is inlaid in the adhesive layer to form a randomly distributed reticular structure.
3. The lithium battery current collector according to claim 1 or 2, wherein the nanofiber and nano-alloy metal particles have a duty cycle in the glue layer of 10% -50%.
4. The lithium battery current collector according to claim 1 or 2, wherein the nanofiber is one of a carbon nanofiber and a carbon nanofiber; the length of the fiber is 20-30um, and the diameter of the fiber cross section is 10-80nm.
5. The lithium battery current collector of claim 1 or 2, wherein the nano-alloy metal particles are oxidation-resistant, low-melting alloy metals; the grain diameter of the nano alloy metal particles is 30-40nm.
6. The lithium battery current collector of claim 1, wherein the conductive layer is one or more of aluminum, copper, aluminum alloy and silver, and has a thickness of 100-2000nm.
7. The lithium battery current collector of claim 1, wherein the conductive layer is formed by one or both of magnetron sputtering, electroplating, thermal evaporation, ion beam evaporation.
8. The lithium battery current collector of claim 1, wherein the polymer film layer is one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene.
9. The lithium battery current collector of claim 1, wherein a connecting layer is further provided between the conductive layer and the glue layer; the connecting layer is one or more of metal nickel, titanium, copper, aluminum or titanium nitride; the thickness is 10-100nm.
10. The lithium battery current collector according to any one of claims 1 to 9, wherein the lithium battery current collector is one of a positive electrode current collector, a negative electrode current collector, and a positive and negative electrode current collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320766080.6U CN220731566U (en) | 2023-04-10 | 2023-04-10 | Current collector of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320766080.6U CN220731566U (en) | 2023-04-10 | 2023-04-10 | Current collector of lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220731566U true CN220731566U (en) | 2024-04-05 |
Family
ID=90502221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320766080.6U Active CN220731566U (en) | 2023-04-10 | 2023-04-10 | Current collector of lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220731566U (en) |
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2023
- 2023-04-10 CN CN202320766080.6U patent/CN220731566U/en active Active
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