CN111430724A - Current collector, preparation method thereof and soft package lithium ion battery - Google Patents
Current collector, preparation method thereof and soft package lithium ion battery Download PDFInfo
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- CN111430724A CN111430724A CN202010415731.8A CN202010415731A CN111430724A CN 111430724 A CN111430724 A CN 111430724A CN 202010415731 A CN202010415731 A CN 202010415731A CN 111430724 A CN111430724 A CN 111430724A
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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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- 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
Abstract
The invention discloses a current collector. The current collector is a graphene-like/metal film current collector and comprises a graphene-like film and a metal film arranged on the bottom surface of the graphene-like film, wherein the thickness of the graphene-like film is between 6 and 10 micrometers, and the thickness of the metal layer is not more than 5 micrometers; the graphene-like membrane is subjected to hydrophilic treatment. The current collector provided by the invention has the characteristics of small thickness, low mass, high conductivity and the like. In addition, the invention also provides a preparation method thereof and a soft package lithium ion battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a current collector and a preparation method thereof, and also relates to a soft package lithium ion battery.
Background
The soft package lithium ion battery is one kind of lithium ion battery, is different from traditional cylinder battery and button cell, and soft package battery is widely used in consumer electronics and electric automobile, electric bicycle and other fields with advantages such as its specific energy is bigger, plasticity is stronger, the security is better.
At present, people's requirement to laminate polymer battery product increases day by day, and the mass flow body that current laminate polymer battery positive and negative pole piece adopted is metal aluminium foil and copper foil respectively, and the mass flow body of metal has following problem in the use: firstly, the density of metal is large, the specific weight of the metal in the whole battery is also large, and the energy density of the battery is seriously influenced; the heat conductivity of the two metals is poor, and particularly when the battery cell is thick, heat generated inside the soft-package lithium ion battery is difficult to quickly dissipate, so that the electrolyte is decomposed; and safety hidden troubles can be brought when the heat is too large.
Therefore, it is necessary to provide a soft package lithium ion battery with high energy density and good safety.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the current collector with high energy density and good safety.
A current collector, which is a graphene-like/metal film current collector comprising a graphene-like film and a metal film disposed on a bottom surface of the graphene-like film, wherein the graphene-like film has a thickness of between 6-10 μ ι η, and the metal layer has a thickness of no greater than 5 μ ι η; the graphene-like membrane is subjected to hydrophilic treatment.
Preferably, the method of the hydrophilic treatment may be a plasma surface treatment.
Preferably, the thickness of the graphene-like layer is 8 μm, and the metal layer is 5 μm.
A preparation method of a current collector comprises the following steps: s1, preparing graphene-like and rolling the graphene-like to obtain a graphene-like film; s2, carrying out hydrophilic modification treatment on the similar graphene membrane obtained in the previous step to obtain a surface hydrophilic similar graphene membrane; and S3, plating a layer of metal film on the surface of the graphene-like body obtained in the previous step to obtain a graphene-like/metal film current collector.
Preferably, in step S2, the graphene-like material is subjected to a hydrophilic treatment, such as a plasma surface modification method.
Preferably, in step S1, the graphene-like film is prepared by using graphene oxide as a raw material, and then graphitizing the graphene oxide in a protective gas environment or a vacuum environment, where the processing temperature is between 2500-.
Preferably, in step S1, any polymer of polyamide imide (PAI), Polyimide (PI), polyamide and polyether imide (PEI) is used as a precursor, and the polymer is first carbonized at a low temperature, wherein the carbonization temperature is between 1000-1500 ℃, and the treatment time is between 5-10 hours; and then carrying out graphitization treatment on the obtained carbonized product under a protective atmosphere, wherein the graphitization treatment temperature is between 2500-3000 ℃, and the treatment time is between 2-4 hours.
Preferably, in step S3, the metal of the metal film may be at least one of copper, aluminum, nickel, silver, and gold.
Preferably, in step S4, the method for plating the metal film is any one of Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), electroplating method, and vacuum evaporation.
A soft package lithium ion battery comprises the graphene-like/metal film current collector or the current collector prepared by the current collector preparation method.
Drawings
Fig. 1 is a flow chart of a method for preparing a current collector provided in the present invention.
Fig. 2 is a schematic view of a structure of a graphene-like/metal film provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A preparation method of a soft package lithium ion battery at least comprises the following steps:
firstly, preparing a current collector;
referring to fig. 1, fig. 1 is a flow chart of a method for manufacturing a current collector provided in the present invention.
The current collector is a graphene-like/metal film current collector, and the preparation method of the graphene-like/metal film current collector comprises the following steps:
s1, preparing a graphene-like film;
the preparation of the graphene-like film can adopt the following method:
the graphene-like film can be carbonized and graphitized in a protective atmosphere or in a vacuum environment by using a polymer film. The polymer has to have excellent mechanical properties and good chemical stability, and can be any one of polyamide imide (PAI), Polyimide (PI), polyamide, and polyether imide (PEI). The low-temperature carbonization treatment temperature of the polymer is between 1000 ℃ and 1500 ℃, and the treatment time is between 5 and 10 hours. And then carrying out graphitization treatment on the obtained carbonized product in a protective atmosphere, wherein the graphitization treatment temperature is 2500-3000 ℃, the temperature rise rate is between 2-10 ℃/min, and the treatment time is between 2-4 hours. The protective atmosphere may be an argon atmosphere or a nitrogen atmosphere, which is not limited in the present invention.
In addition, the graphene-like material can also be prepared by using graphene oxide as a precursor. Firstly, coating graphene oxide slurry on the surface of a copper foil, and then drying the graphene oxide slurry to obtain a graphene oxide film adhered to the surface of the copper foil; the graphene oxide slurry may be a commercially available graphene oxide slurry or a self-prepared graphene oxide slurry, and is not limited herein. The drying temperature of the graphene oxide is controlled between 50 and 100 ℃. And (3) placing the graphene oxide film bonded on the surface of the copper foil obtained in the step above in an inert gas protective atmosphere for graphitization treatment for a predetermined time to obtain the flexible graphene-like film with high thermal conductivity. Specifically, the graphitization treatment temperature is between 2500-; the heat preservation treatment time is between 2 and 4 hours after the temperature is raised to the preset temperature. In addition, the copper foil can be evaporated at the graphitization treatment temperature, and finally the flexible graphene-like film with high thermal conductivity is obtained.
S2, then rolling and forming the obtained graphene-like film;
the graphene-like film is rolled on a PET film. Wherein the rolling pressure is between 20 and 100 MPa; the rolling temperature is between 100 ℃ and 300 ℃, and the feeding speed of the roller press is between 2 and 5 m/min. By using the setting of the rolling pressure, graphite-like films with different thicknesses can be prepared. The thickness of the graphene-like film in the present invention is between 6-10 μm.
The problem of crimping and wrinkling of the graphene-like film during subsequent storage and subsequent use can be solved by rolling the graphene-like film. In addition, the graphene-like film is rolled on the PET film, so that the graphene film can be conveniently wound, and meanwhile, the tensile strength of the graphene-like film in subsequent industrial coating can be enhanced.
And S3, carrying out hydrophilic modification treatment on the graphene-like membrane obtained in the S2 to obtain the graphene-like membrane with a hydrophilic surface.
In the step, the graphene-like membrane is subjected to hydrophilic modification treatment, and the modification method can be Plasma surface modification (Plasma) treatment. By modifying the graphene-like membrane, the graphene-like membrane can be made more hydrophilic, and the surface of the graphene-like membrane is hydrophobic without treatment. At present, water-based binders such as CMC, SBR, sodium alginate and the like are often used in the preparation process of the anode and cathode slurry, and the graphene-like membrane is subjected to surface modification treatment to improve the combination effect of the graphene-like membrane and the slurry adopting the water-based binders. In addition, the graphene-like film subjected to surface modification can enhance the binding force between the graphene-like film and metal. Firstly, metal and metal form chemical bonds with carboxyl and hydroxyl on the surface; in addition, the surface of the modified graphite film is rougher, and the bonding force with a plating layer can be enhanced.
And S4, plating a metal film on the surface of the graphene-like body obtained in the S3 to obtain a graphene-like/metal film current collector.
In this step, the metal of the metal film on the graphene-like surface may be at least one of copper, aluminum, nickel, silver, and gold. The plating method for the metal film may be at least one of Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), plating method, or vacuum evaporation.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a graphene-like/metal film according to the present invention. The graphene-like/metal film 100 includes a graphene-like film 10 and a metal film 20. The metal film 20 is disposed on the bottom surface of the graphene film 10. The thickness of the graphene-like/metal film is between 6 and 15 mu m, the thickness of the metal film is not more than 5 mu m, and the thickness of the graphene-like film is between 6 and 10.
Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In the present invention, the coating of the positive or negative electrode slurry may be a single layer or a double layer coating.
Because the graphene-like/metal film current collector is subjected to hydrophilic modification, the graphene-like/metal film can be better combined with the anode slurry or the cathode slurry adopting the water-based binder, and the coating effect of the electrode material is improved.
Finally, injecting electrolyte, welding a tab and coating a polymer shell; after the diaphragm and the positive and negative pole pieces are assembled, welding the film and a metal outer lug or a graphite film outer lug by adopting a graphite film surface metallization welding method to obtain a soft package battery cell; and then coating the polymer shell on the soft-package battery cell to obtain the soft-package lithium ion battery.
Example 1
The preparation method of the soft package lithium ion battery comprises the following steps:
(1) firstly, preparing a graphene-like/metal film current collector;
the preparation of the graphene-like film is realized by carbonizing polymer Polyimide (PI) under a protective atmosphere at 1000 ℃ for 10 hours. And then carrying out graphitization treatment on the polyimide subjected to low-temperature carbonization treatment under a protective atmosphere to obtain the graphene-like material. Wherein the graphitization treatment temperature is 2500 ℃ and the treatment time is 4 hours.
Then, rolling and forming the obtained graphene-like film;
and rolling the graphene-like film current collector on the PET film. Wherein the rolling pressure is set to 100 MPa; the rolling temperature is 300 ℃, and the feeding speed of the roller press is 2 m/min. Pure graphite films and graphite/metal composite films with different thicknesses can be prepared by setting the roll pressing pressure. Wherein the graphene-like film has a thickness of between 5 μm.
And then evaporating a layer of aluminum metal film on the rolled graphene-like film by adopting a vacuum evaporation method.
And then carrying out hydrophilic modification treatment on the graphene-like by adopting a plasma surface treatment method, thereby obtaining the graphene-like/metal film current collector with hydrophilic surface. And plating a layer of copper metal film on the surface of the graphene-like body subjected to surface hydrophilic treatment to obtain a graphene-like body/metal film current collector. The thickness of the graphene-like/metal film is 10 μm, and the thickness of the metal film is 5 μm.
(2) Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In this embodiment, the coating of the positive or negative electrode slurry is a double coating.
(3) And finally, injecting electrolyte, welding a tab and coating a polymer shell, thereby preparing the soft package lithium ion battery.
Example 2
The preparation method of the soft package lithium ion battery comprises the following steps:
(1) firstly, preparing a graphene-like/metal film current collector;
the preparation of the graphene-like film is realized by selecting polyamide-imide (PAI) to carry out carbonization treatment under a protective atmosphere, wherein the carbonization treatment temperature is 1200 ℃, and the treatment time is 9 hours. And then carrying out graphitization treatment on the polyimide subjected to low-temperature carbonization treatment under a protective atmosphere to obtain the graphene-like material. Wherein the graphitization treatment temperature is 2700 ℃ and the treatment time is 4 hours.
Then, rolling and forming the obtained graphene-like film;
and rolling the graphene-like film current collector on the PET film. Wherein the rolling pressure is set to 20 MPa; the rolling temperature is 100 ℃, and the feeding speed of the roller press is 5 m/min. Pure graphite films and graphite/metal composite films with different thicknesses can be prepared by setting the roll pressing pressure. Wherein the graphene-like film has a thickness of 10 μm.
And then evaporating a layer of copper metal film on the rolled graphene-like film by adopting a physical vapor deposition method.
And then carrying out hydrophilic modification treatment on the graphene-like by adopting a plasma surface treatment method, thereby obtaining the graphene-like/metal film current collector with hydrophilic surface. And plating a layer of copper metal film on the surface of the graphene-like body subjected to surface hydrophilic treatment to obtain a graphene-like body/metal film current collector. The thickness of the graphene-like/metal film in the invention is 15 μm, and the thickness of the metal film is 5 μm.
(2) Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In this embodiment, the coating of the positive or negative electrode slurry is a single layer coating.
(3) Finally, injecting electrolyte, welding the electrode lug and coating the polymer shell. Thereby completing the preparation of the soft package lithium ion battery.
Example 3
The preparation method of the soft package lithium ion battery comprises the following steps:
(1) firstly, preparing a graphene-like/metal film current collector;
the preparation method of the graphene-like membrane comprises the steps of selecting a polymer polyether imide (PEI) to carry out carbonization treatment under a protective atmosphere, wherein the carbonization treatment temperature is 1300 ℃, and the treatment time is 7 hours. And then carrying out graphitization treatment on the polyimide subjected to low-temperature carbonization treatment under a protective atmosphere to obtain the graphene-like material. Wherein the graphitization treatment temperature is 2800 ℃ and the treatment time is 3 hours.
Then, rolling and forming the obtained graphene-like film;
and rolling the graphene-like film current collector on the PET film. Wherein the rolling pressure is set to 50 MPa; the rolling temperature is 200 ℃, and the feeding speed of the roller press is 3 m/min. By using the setting of the rolling pressure, pure graphite films and graphite/metal composite films with different thicknesses can be prepared. Wherein the graphene-like film has a thickness of 8 μm.
And then evaporating a layer of aluminum metal film on the rolled graphene-like film by adopting a vacuum evaporation method.
And then carrying out hydrophilic modification treatment on the graphene-like by adopting a plasma surface treatment method, thereby obtaining the graphene-like/metal film current collector with hydrophilic surface. And plating a layer of copper metal film on the surface of the graphene-like body subjected to surface hydrophilic treatment to obtain a graphene-like body/metal film current collector. The thickness of the graphene-like/metal film in the invention is 12 μm, and the thickness of the metal film is 3 μm.
(2) Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In this embodiment, the coating of the positive or negative electrode slurry is a double coating.
(3) Finally, injecting electrolyte, welding the electrode lug and coating the polymer shell. Thereby completing the preparation of the soft package lithium ion battery.
Example 4
The preparation method of the soft package lithium ion battery comprises the following steps:
(1) firstly, preparing a graphene-like/metal film current collector;
the preparation of the graphene-like film is realized by carbonizing polymer Polyimide (PI) under a protective atmosphere at 1500 ℃ for 5 hours. And then carrying out graphitization treatment on the polyimide subjected to low-temperature carbonization treatment under a protective atmosphere to obtain the graphene-like material. Wherein the graphitization treatment temperature is 3000 ℃, and the treatment time is 2 hours.
Then, rolling and forming the obtained graphene-like film;
and rolling the graphene-like film current collector on the PET film. Wherein the rolling pressure is set to 80 MPa; the rolling temperature is 200 ℃, and the feeding speed of the roller press is 4 m/min. Pure graphite films and graphite/metal composite films with different thicknesses can be prepared by setting the roll pressing pressure. Wherein the graphene-like film has a thickness of 7 μm.
And then evaporating a layer of copper metal film on the rolled graphene-like film by adopting a vacuum evaporation method.
And then carrying out hydrophilic modification treatment on the graphene-like by adopting a plasma surface treatment method, thereby obtaining the graphene-like/metal film current collector with hydrophilic surface. And plating a layer of copper metal film on the surface of the graphene-like body subjected to surface hydrophilic treatment to obtain a graphene-like body/metal film current collector. The thickness of the graphene-like/metal film in the invention is 11 μm, and the thickness of the metal film is 4 μm.
(2) Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In this embodiment, the coating of the positive or negative electrode slurry is a single layer coating.
(3) Finally, injecting electrolyte, welding the electrode lug and coating the polymer shell. Thereby completing the preparation of the soft package lithium ion battery.
Example 5
The preparation method of the soft package lithium ion battery comprises the following steps:
(1) firstly, preparing a graphene-like/metal film current collector;
the preparation of the graphene-like film selects graphene oxide as a precursor for preparation. Firstly, coating graphene oxide slurry on the surface of a copper foil, and then drying the graphene oxide slurry to obtain a graphene oxide film adhered to the surface of the copper foil; and then, putting the two into a protective atmosphere for graphitization treatment to obtain the graphene-like material. Wherein the graphitization treatment temperature is 2800 ℃ and the treatment time is 3 hours.
Then, rolling and forming the obtained graphene-like film;
and rolling the graphene-like film current collector on the PET film. Wherein the rolling pressure is set to 50 MPa; the rolling temperature is 200 ℃, and the feeding speed of the roller press is 2 m/min. Pure graphite films and graphite/metal composite films with different thicknesses can be prepared by setting the roll pressing pressure. Wherein the graphene-like film has a thickness of between 10 μm.
And then evaporating a layer of aluminum metal film on the rolled graphene-like film by adopting a vacuum evaporation method.
And then carrying out hydrophilic modification treatment on the graphene-like by adopting a plasma surface treatment method, thereby obtaining the graphene-like/metal film current collector with hydrophilic surface. And plating a layer of copper metal film on the surface of the graphene-like body subjected to surface hydrophilic treatment to obtain a graphene-like body/metal film current collector. The thickness of the graphene-like/metal film in the invention is 15 μm, and the thickness of the metal film is 5 μm.
(2) Then coating electrode materials;
and uniformly mixing the positive electrode active material or the negative electrode active material with a conductive agent and a binder in proportion to obtain positive electrode slurry or negative electrode slurry, and then coating the positive electrode slurry or the negative electrode slurry on the surface of the rolled graphene-like/metal film current collector departing from the PET film. In this embodiment, the coating of the positive or negative electrode slurry is a single layer coating.
(3) Finally, injecting electrolyte, welding the electrode lug and coating the polymer shell. Thereby completing the preparation of the soft package lithium ion battery.
The invention has the beneficial effects that: the surface hydrophilic graphene-like/metal film prepared by the invention has the advantages of small thickness, low quality, high conductivity, high heat transfer rate, excellent bending strength, stable physical and chemical properties and the like, and is an excellent soft package lithium ion battery current collector. The soft package lithium ion battery adopting the graphene/metal film reduces the mass of inactive materials in the traditional soft package battery, and is beneficial to improving the energy density, especially the volume energy density of the battery; on the other hand, the heat generated by charging and discharging in the battery can be rapidly transferred, and the safety and the practicability of the soft package battery are improved. In addition, the method provided by the invention is suitable for large-scale production.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A current collector, wherein the current collector is a graphene-like/metal film current collector comprising a graphene-like film and a metal film disposed on a bottom surface of the graphene-like film, wherein a thickness of the graphene-like film is between 6 and 10 μm, and a thickness of the metal layer is not greater than 5 μm; the graphene-like membrane is subjected to hydrophilic treatment, and the thickness of the graphene-like/metal membrane is between 6 and 15 micrometers.
2. The current collector of claim 1, wherein the hydrophilic treatment is a plasma surface treatment.
3. The current collector of claim 2, wherein the graphene-like layer has a thickness of 8 μ ι η and the metal layer is 5 μ ι η.
4. A preparation method of a current collector comprises the following steps:
s1, preparing graphene-like and rolling the graphene-like to obtain a graphene-like film;
s2, carrying out hydrophilic modification treatment on the similar graphene membrane obtained in the previous step to obtain a surface hydrophilic similar graphene membrane;
and S3, plating a layer of metal film on the surface of the graphene-like body obtained in the previous step to obtain a graphene-like/metal film current collector.
5. The current collector preparation method according to claim 4, wherein in step S2, the graphene-like body is subjected to a hydrophilic treatment method, a plasma surface modification method.
6. The method for preparing the current collector as claimed in claim 4, wherein in step S1, graphene oxide is used as a raw material for preparing the graphene-like film, and then the graphene oxide is graphitized in a protective gas environment or a vacuum environment, wherein the processing temperature is between 2500 ℃ and 3000 ℃.
7. The method for preparing the current collector as claimed in claim 4, wherein in step S1, any one of polyamide imide (PAI), Polyimide (PI), polyamide and polyether imide (PEI) is used as a precursor, and the polymer is first carbonized at a low temperature of between 1000 ℃ and 1500 ℃ for a treatment time of between 5 hours and 10 hours; and then carrying out graphitization treatment on the obtained carbonized product under a protective atmosphere, wherein the graphitization treatment temperature is between 2500-3000 ℃, and the treatment time is between 2-4 hours.
8. The current collector preparation method according to claim 4, wherein in the present step S3, the metal of the metal film may be at least one of copper, aluminum, nickel, silver, and gold.
9. The current collector preparation method according to claim 4, wherein in the step S4, the metal film is coated by any one of Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), electroplating or vacuum evaporation.
10. A soft-packed lithium ion battery, characterized in that the lithium ion battery comprises the graphene-like/metal film current collector of any one of claims 1 to 3, or the current collector prepared by the current collector preparation method of any one of claims 4 to 9.
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| TWI818417B (en) * | 2021-02-04 | 2023-10-11 | 美商索特利亞電池創新集團公司 | Tabless cell utilizing metallized film current collectors |
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| CN110739461A (en) * | 2019-09-05 | 2020-01-31 | 东莞市烯热材料科技有限公司 | novel graphene-like heat-conducting composite current collector for positive and negative poles of lithium ion |
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