CN113948710A - Positive current collector, positive plate and lithium ion battery - Google Patents
Positive current collector, positive plate and lithium ion battery Download PDFInfo
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- CN113948710A CN113948710A CN202111232051.3A CN202111232051A CN113948710A CN 113948710 A CN113948710 A CN 113948710A CN 202111232051 A CN202111232051 A CN 202111232051A CN 113948710 A CN113948710 A CN 113948710A
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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
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
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- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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Abstract
The application provides a positive current collector, positive plate and lithium ion battery, the positive current collector includes: a substrate, and a conductive coating disposed on the substrate; the conductive coating comprises a graphene material, a carbon nanotube material and an adhesive material. The positive current collector provided by the embodiment of the application can reduce the impedance of the formed positive current collector through the conductive coating formed by matching the graphene material, the carbon nanotube material and the bonding material under the condition that the thickness value of the base material is small; the lithium ion battery prepared based on the positive current collector has the advantages of high energy density and low charging temperature rise.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a positive current collector, a positive plate and a lithium ion battery.
Background
Lithium ion batteries have the advantages of high energy density, long cycle life, and the like, and are widely applied to various fields at present.
Generally speaking, the energy density of the lithium ion battery is correspondingly improved by reducing the thickness of the current collector, so as to meet the increasing high-capacity requirement of the market, but in practice, along with the reduction of the thickness of the current collector, the impedance of the current collector is correspondingly increased, so that the temperature rise of the lithium ion battery during high-power charging and discharging is increased, that is, the energy density improvement requirement and the temperature rise control requirement of the lithium ion battery cannot be considered in the related technology.
Disclosure of Invention
An object of the embodiment of the application is to provide a positive current collector, a positive plate and a lithium ion battery, which are used for solving the problem that the energy density promotion requirement and the temperature rise control requirement of the lithium ion battery cannot be considered.
In a first aspect, an embodiment of the present application provides a positive electrode current collector, including:
a substrate, and a conductive coating disposed on the substrate;
the conductive coating comprises a graphene material, a carbon nanotube material and an adhesive material.
In a second aspect, an embodiment of the present application provides a positive electrode sheet, including the positive electrode current collector of the first aspect, and an active coating disposed on the positive electrode current collector.
In a third aspect, embodiments of the present application provide a lithium ion battery, which includes a separator, a negative electrode sheet, an electrolyte, a package case, and the positive electrode sheet described in the second aspect.
The technical scheme has the following advantages or beneficial effects:
the positive current collector, the positive plate and the lithium ion battery provided by the embodiment of the application can give consideration to the energy density lifting requirement and the temperature rise control requirement of the lithium ion battery through the matching of the graphene material, the carbon nanotube material and the bonding material, and the lithium ion battery has better safety.
Drawings
Fig. 1 is a schematic structural diagram of a positive electrode current collector provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a positive electrode current collector according to an embodiment of the present disclosure, and as shown in fig. 1, the positive electrode current collector includes:
a substrate 10, and a conductive coating 20 disposed on the substrate 10;
the conductive coating 20 includes a graphene material, a carbon nanotube material, and an adhesive material.
The positive current collector provided by the embodiment of the application can reduce the impedance of the positive current collector through the conductive coating 20 formed by matching the graphene material, the carbon nanotube material and the bonding material under the condition that the thickness value of the base material 10 is small; the lithium ion battery manufactured based on the positive current collector can give consideration to the requirements of energy density improvement and temperature rise control.
The graphene material is arranged to improve the conductivity of the positive current collector and reduce the impedance of the positive current collector in the charge and discharge processes of the lithium ion battery; the setting of carbon nanotube material can promote the electric conductive property of anodal mass flow body on the one hand, and on the other hand can promote conductive coating 20's structural stability and toughness, reduces anodal mass flow body's fracture risk, promotes anodal mass flow body's security, utilizes the tubular structure of carbon nanotube material and the slice structure's of graphite alkene material cooperation promptly, makes conductive coating 20 form three-dimensional network structure to reach the purpose of promoting anodal mass flow body's toughness. The adhesive material can improve the adhesion between the graphene material and the carbon nanotube material, and can also improve the van der waals force between the conductive coating 20 and the base material 10, so that the adhesion between the conductive coating 20 and the base material 10 is improved.
The graphene material and the carbon nanotube material both have excellent heat conduction performance, and heat generated at the tabs can be quickly conducted to other parts of the lithium ion battery through the conductive coating 20 in the charging and discharging processes of the lithium ion battery, so that the temperature rise of the positive plate is correspondingly reduced, and the cycle performance of the lithium ion battery is improved.
In practice, the adhesive material may be one or more of Styrene-Butadiene Rubber (SBR), Carboxymethyl Cellulose (CMC), polyvinylidene fluoride (PVDF), Polymethyl Methacrylate (PMMA), Polyacrylonitrile (Polyacrylonitrile, PAN), and Polyethylene Oxide (PEO).
The conductive coating 20 is preferably formed by coating a conductive coating on the substrate 10 by gravure roll coating, wherein the conductive coating is a graphene material, a carbon nanotube material and an adhesive material which are uniformly mixed.
Optionally, the mass percentage of the graphene material in the conductive coating 20 is greater than or equal to 50 wt% and less than or equal to 60 wt%.
Through the arrangement, the mass ratio of the graphene material in the conductive coating 20 is at least 50 wt%, so that the excellent conductive performance of the graphene material is fully embodied in the conductive coating 20, and the impedance of the positive electrode current collector provided with the conductive coating 20 is reduced; the mass ratio of the graphene material in the conductive coating 20 is limited to 60 wt% or less, so as to ensure that the properties of the carbon nanotube material and the adhesive material are sufficiently exhibited in the conductive coating 20, thereby reducing the risk of fracture of the conductive coating 20.
The carbon nanotube material is characterized in that a three-dimensional network structure is formed by matching with a graphene material, so that the toughness of the positive current collector provided with the conductive coating 20 is improved; the adhesive material has the characteristics of improving the adhesion between the carbon nanotube material and the graphene material and improving the adhesion between the conductive coating 20 and the base material 10.
Further, the mass ratio of the carbon nanotube material in the conductive coating 20 is greater than or equal to 30 wt% and less than or equal to 40 wt%.
With the above arrangement, the mass ratio of the conductive material (i.e., the graphene material and the carbon nanotube material) in the conductive coating 20 is not less than 90 wt%, which can ensure that the conductive coating 20 has excellent conductive performance, and reduce the impedance of the positive electrode current collector provided with the conductive coating 20.
In addition, the graphene material is of a sheet structure, so that the graphene material is easier to roll compared with a tubular structure of a carbon nanotube material, the mass ratio of the carbon nanotube material in the conductive coating 20 is smaller than that of the graphene material in the conductive coating 20, the rolling operation of the conductive coating 20 can be facilitated, and the manufacturing efficiency of the positive current collector is improved.
Further, the mass ratio of the bonding material in the conductive coating 20 is greater than or equal to 5 wt% and less than or equal to 10 wt%.
Through the arrangement, the bonding effect of the bonding material is fully applied to the conductive coating 20, the tight combination of the graphene material and the carbon nanotube material is ensured, and the toughness of the conductive coating 20 is improved; and meanwhile, the firm connection between the conductive coating 20 and the substrate 10 is ensured, and the structural stability of the positive current collector is improved.
Optionally, the conductive coating 20 is located on at least one side of the substrate 10;
the substrate 10 includes at least one of an aluminum foil, a porous aluminum foil, and a nickel foil.
Through the above arrangement, it is ensured that the conductive effect of the conductive coating 20 is fully applied to the positive current collector, for example, if the substrate 10 includes a first surface and a second surface that are opposite to each other, the conductive coating 20 may be disposed on the first surface of the substrate 10, may also be disposed on the second surface of the substrate 10, and may also be disposed on the first surface and the second surface of the substrate 10; in practical applications, the conductive coating 20 is preferably disposed on the first side and the second side of the substrate 10, in which case, the conductive coating 20 disposed on the first side and the conductive coating 20 disposed on the second side are symmetrical with respect to the substrate 10.
Optionally, the ratio between the area of the conductive coating 20 and the area of the substrate 10 is greater than or equal to 0.7 and less than or equal to 1.
The above arrangement can be further explained as if the conductive coating 20 is only disposed on the first side of the substrate 10, the ratio between the area of the conductive coating 20 and the area of the first side of the substrate 10 is greater than or equal to 0.7 and less than or equal to 1; if the conductive coating 20 is only disposed on the second side of the substrate 10, the ratio between the area of the conductive coating 20 and the area of the second side of the substrate 10 is greater than or equal to 0.7 and less than or equal to 1; if the conductive coatings 20 are disposed on the first and second sides of the substrate 10, the ratio between the total area of the conductive coatings 20 (the sum of the area of the conductive coating 20 disposed on the first side and the area of the conductive coating 20 disposed on the second side) and the total area of the substrate 10 (the sum of the area of the first side of the substrate 10 and the area of the second side of the substrate 10) is greater than or equal to 0.7 and less than or equal to 1.
With the above arrangement, sufficient coating of the surface of the base material 10 with the conductive coating 20 is ensured, and the impedance of the positive electrode current collector including the base material 10 and the conductive coating 20 is reduced.
In practical applications, in the case that the ratio of the area of the conductive coating 20 to the area of the substrate 10 is not equal to 1, the portion of the substrate 10 that is not covered by the conductive coating 20 can be used for connecting components such as tabs.
Optionally, the product of the thickness of the substrate 10 and the thickness of the conductive coating 20 is greater than 3 microns and less than 20 microns.
Through the above arrangement, the thickness of the base material 10 and the thickness of the conductive coating 20 are constrained, on the premise that the conductivity of the conductive coating 20 is fully applied, the thickness of the positive current collector formed by the base material 10 and the conductive coating 20 is reduced, under the condition that the thickness of the positive plate is certain, the thickness of the active coating arranged on the positive current collector can be increased, the energy density of the positive plate is improved, and the positive plate and the lithium ion battery which are manufactured based on the positive current collector can have higher energy density and lower charging temperature rise.
Further, the thickness of the conductive coating 20 is greater than 0.5 microns and less than 3 microns;
the thickness of the substrate 10 is greater than 5 microns and less than 10 microns.
As described above, by further restricting the thickness of the conductive coating 20 and the thickness of the substrate 10, the positive plate and the lithium ion battery manufactured based on the positive electrode current collector can have higher energy density and lower charging temperature rise.
The embodiment of the application also provides a positive plate, which comprises the positive current collector and an active coating arranged on the positive current collector.
The active coating is formed by coating, rolling and other operation treatments on an active coating, and actually, the active coating comprises at least one of lithium cobaltate, a lithium nickelate material, a lithium iron phosphate material, lithium iron manganese phosphate and a ternary material; the ternary material comprises at least one of a lithium manganate material and a nickel cobalt lithium manganate material; wherein, the content of nickel, cobalt and manganese in the nickel cobalt lithium manganate material can be 8: 1: 1, or 6: 2: 2, or 5: 3: 2 (i.e., NCM811, NCM622, NCM532), etc.
The embodiment of the application also provides a lithium ion battery, which comprises a diaphragm, a negative plate, an electrolyte, a packaging shell and the positive plate.
In practical application, the lithium ion battery is tested as follows:
the lithium ion battery of experimental group 1 was set to be manufactured by the following steps:
step S1, adding 1.1 wt% of conductive agent and 1.1 wt% of binder into 97.8 wt% of lithium cobaltate 1; wherein, the conductive agent is conductive carbon black and conductive carbon tubes, and the weight ratio of the conductive agent to the conductive carbon tubes is 4: 1, the binder is polyvinylidene fluoride, and then the binder is adjusted into a positive active substance by N-methyl pyrrolidone. And coating the positive active substance on the surface of the positive current collector by coating equipment, and then drying, rolling, slitting and tabletting to obtain the positive plate.
Step S2, adding a conductive agent, a binder and a dispersing agent into the active substance, and adjusting by using deionized water to prepare cathode slurry; wherein the active substance is a graphite material, and the mass of the active substance in the negative electrode slurry accounts for 95-97.5 wt%; the mass percentage of the conductive agent in the negative electrode slurry is 0.5-2.5 wt%, the mass percentage of the binder (namely styrene butadiene rubber) in the negative electrode slurry is 1.5-2.5 wt%, and the mass percentage of the dispersant (namely sodium carboxymethyl cellulose) in the negative electrode slurry is 0.5-1.5 wt%; the conductive agent is formed by mixing conductive carbon black and a conductive carbon tube, and the mass ratio of the conductive carbon black to the conductive carbon tube is 0.25-0.5. Coating the negative electrode slurry on the surface of a negative electrode current collector by coating equipment, and then drying, rolling, slitting and tabletting to obtain the negative electrode sheet. The negative electrode current collector may be one of a copper foil or a porous copper foil.
S3, stacking the positive plate, the negative plate and the diaphragm, manufacturing a winding core in a winding mode, and packaging the winding core by using an aluminum-plastic film to manufacture a battery cell; and then, the lithium ion battery is obtained through the working procedures of liquid injection, aging, formation, sorting and the like. Wherein the diaphragm is an oil-based diaphragm.
In the lithium ion battery of experimental group 1, the thickness of the base material 10 of the positive electrode current collector was 6 micrometers, the thickness of the conductive coating 20 of the positive electrode current collector was 2 micrometers, and the mass ratios of the graphene material, the carbon nanotube material, and the adhesive material in the conductive coating 20 were 60 wt%, 30 wt%, and 10 wt%, respectively.
The lithium ion batteries of experimental group 2 were set as:
the battery manufacturing steps of the experimental group 2 are the same as those of the experimental group 1, except that in the lithium ion battery of the experimental group 2, the thickness of the base material 10 of the positive current collector is 7 micrometers, the thickness of the conductive coating 20 of the positive current collector is 1.5 micrometers, and the material composition in the conductive coating 20 is kept unchanged, i.e., the mass percentages of the graphene material, the carbon nanotube material, and the bonding material in the conductive coating 20 are 60 wt%, 30 wt%, and 10 wt%, respectively.
The lithium ion batteries of experimental group 3 were set as:
the battery manufacturing steps of the experimental group 3 are the same as those of the experimental group 1, except that in the lithium ion battery of the experimental group 3, the thickness of the base material 10 of the positive current collector is 8 micrometers, the thickness of the conductive coating 20 of the positive current collector is 0.5 micrometers, and the material composition in the conductive coating 20 remains unchanged, that is, the mass percentages of the graphene material, the carbon nanotube material and the bonding material in the conductive coating 20 are 60 wt%, 30 wt% and 10 wt%, respectively.
The lithium ion batteries of experimental group 4 were set as:
the procedure for fabricating the battery of experiment group 4 was the same as that of experiment group 1, except that the lithium ion battery of experiment group 4 had a ratio of the graphene material, the carbon nanotube material, and the adhesive material in the conductive coating 20 of 50 wt%, 40 wt%, and 10 wt%, respectively.
The lithium ion batteries of experimental group 5 were set as:
the procedure for fabricating the battery of experiment group 5 was the same as that of experiment group 1, except that the lithium ion battery of experiment group 5 had a ratio of the graphene material, the carbon nanotube material, and the adhesive material in the conductive coating 20 of 55 wt%, 35 wt%, and 10 wt%, respectively.
The lithium ion batteries of experimental group 6 were set as:
the procedure for fabricating the battery of experiment group 6 was the same as that of experiment group 1, except that the lithium ion battery of experiment group 6 had graphene material, carbon nanotube material and adhesive material in the conductive coating 20 at a ratio of 60 wt%, 35 wt% and 5 wt%, respectively.
The lithium ion batteries of experimental group 7 were set as:
the procedure for fabricating the battery of experiment group 7 was the same as that of experiment group 1, except that the lithium ion battery of experiment group 7 had graphene material, carbon nanotube material and adhesive material in the conductive coating 20 at a ratio of 60 wt%, 32 wt% and 8 wt%, respectively.
The lithium ion batteries of the control group 1 were set as follows:
the battery fabrication procedure of the control 1 was the same as that of the battery of the experimental group 1 except that, in the lithium ion battery of the control 1, the positive electrode current collector included only the substrate 10 and the thickness of the substrate 10 was 8 μm.
The lithium ion batteries of the control group 2 were set as follows:
the battery fabrication procedure of the control group 2 was the same as that of the battery of the experimental group 1 except that, in the lithium ion battery of the control group 2, the positive electrode current collector included only the substrate 10, and the thickness of the substrate 10 was 7 μm.
The lithium ion batteries of the control group 3 were set as follows:
the battery manufacturing steps of the control group 3 are the same as those of the battery of the experimental group 1, except that in the lithium ion battery of the control group 3, the thickness of the substrate 10 of the positive current collector is 8 micrometers, the thickness of the conductive coating 20 of the positive current collector is 0.5 micrometers, the conductive coating 20 only includes a graphene material and a bonding material, and the mass percentages of the graphene material and the bonding material are 90 wt% and 10 wt%, respectively.
The lithium ion battery of the control group 4 was set as:
the battery manufacturing steps of the control group 4 are the same as those of the battery of the experimental group 1, except that in the lithium ion battery of the control group 4, the thickness of the base material 10 of the positive electrode current collector is 8 micrometers, the thickness of the conductive coating 20 of the positive electrode current collector is 3 micrometers, and the mass percentages of the graphene material, the carbon nanotube material and the bonding material in the conductive coating 20 are 60 wt%, 30 wt% and 10 wt%, respectively.
The energy density test, the temperature rise test and the cycle performance test are carried out on the experimental groups 1 to 7 and the comparison groups 1 to 4.
The energy density test is to measure the lithium ion battery by adopting a charge-discharge system of charging at 0.2C, discharging at 0.5C and stopping at 0.025C in an environment of 25 ℃; the plateau voltage of the lithium ion battery is the plateau voltage under 0.2C-rate discharge.
The energy density is calculated by adopting a preset formula, wherein the preset formula is as follows:
energy density is capacity × plateau voltage/(cell length × cell width × cell thickness).
The temperature rise test (in an environment of 35 degrees celsius) is:
1. firstly, standing the lithium ion battery for 10 minutes;
2. discharging the lithium ion battery to 3.0V under the multiplying power of 0.2C, and standing the lithium ion battery for 10 minutes;
3. fully filling the lithium ion battery under the multiplying power of 0.7C, stopping the charging at 0.05C, and standing the lithium ion battery for 10 minutes;
4. wrapping the battery cell in an environment of 33-37 ℃, and standing for 2 hours;
5. and discharging the lithium ion battery to a lower limit voltage according to the power of 1.2CW, 1.3CW and 1.4CW respectively, and monitoring the temperature rise of the battery body and the conductive oxide coating.
The cycle performance test comprises the steps of charging the lithium ion battery to 4.45V at a constant current of 1C multiplying power at 45 ℃, then charging at a constant voltage of 4.45V with a cutoff current of 0.025C, then discharging at a constant current of 0.5C multiplying power with a cutoff voltage of 3V, so as to finish a charging and discharging cycle process, repeating the charging and discharging cycle process for 500 times, fully charging the lithium ion battery after the cycle is finished, disassembling the lithium ion battery, and observing and collecting the fracture condition of the positive plate by using a digital camera.
The test results of the above tests are shown in table 1:
TABLE 1
As shown in the test results of the control group 1 and the control group 2, when only the substrate 10 is used as the positive current collector, the impedance of the lithium ion battery is relatively large, the charging temperature rise is relatively high, and when the thickness of the substrate 10 is reduced, the impedance of the positive current collector is significantly increased, and the charging temperature rise is also relatively high.
As shown in the test result of the control group 3, in the case that the conductive coating 20 does not include the carbon nanotube, the temperature rise of the positive electrode sheet provided with the conductive coating 20 is reduced to some extent, but the reduction range is small; and the toughness of the positive current collector is poor, and the fracture risk in the circulation process is high.
As shown in the test result of the control group 4, the temperature rise of the positive electrode sheet in charging can be significantly reduced by increasing the thickness of the conductive coating 20, but the energy density loss of the positive electrode sheet is large.
As shown in the test results of experimental groups 1 to 7, the graphene material, the carbon nanotube material, and the adhesive material are disposed in the conductive coating 20, and the thickness of the base material 10, the thickness of the conductive coating 20, the mass ratio of the graphene material in the conductive coating 20, the mass ratio of the carbon nanotube material in the conductive coating 20, and the mass ratio of the adhesive material in the conductive coating 20 are defined, so that the charging temperature rise of the positive electrode sheet can be significantly reduced, and the positive electrode sheet has a higher energy density.
The foregoing is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and refinements can be made without departing from the principle described in the present application, and these modifications and refinements should be regarded as the protection scope of the present application.
Claims (10)
1. A positive electrode current collector, comprising:
a substrate, and a conductive coating disposed on the substrate;
the conductive coating comprises a graphene material, a carbon nanotube material and an adhesive material.
2. The positive electrode current collector of claim 1, wherein a mass fraction of the graphene material in the conductive coating is greater than or equal to 50 wt% and less than or equal to 60 wt%.
3. The positive electrode current collector according to claim 2, wherein a mass ratio of the carbon nanotube material in the conductive coating is greater than or equal to 30 wt% and less than or equal to 40 wt%.
4. The positive electrode current collector according to claim 3, wherein the mass ratio of the binder in the conductive coating is greater than or equal to 5 wt% and less than or equal to 10 wt%.
5. The positive electrode current collector of claim 1, wherein a ratio between an area of the conductive coating and an area of the substrate is greater than or equal to 0.7 and less than or equal to 1.
6. The positive electrode current collector of claim 1, wherein a product of a thickness of the substrate and a thickness of the conductive coating is greater than 3 microns and less than 20 microns.
7. The positive electrode current collector according to claim 6, wherein the thickness of the conductive coating is greater than 0.5 microns and less than 3 microns;
the substrate has a thickness greater than 5 microns and less than 10 microns.
8. The positive current collector according to claim 1, wherein the conductive coating is located on at least one side of the substrate;
the substrate comprises at least one of an aluminum foil, a porous aluminum foil and a nickel foil.
9. A positive electrode sheet comprising the positive electrode current collector according to any one of claims 1 to 8, and an active coating layer provided on the positive electrode current collector.
10. A lithium ion battery comprising a separator, a negative electrode sheet, an electrolyte, and a package can, wherein the lithium ion battery further comprises the positive electrode sheet of claim 9.
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| WO2024183630A1 (en) * | 2023-03-06 | 2024-09-12 | 江阴纳力新材料科技有限公司 | High-conductivity nano-coated current collector, electrode, battery, and method for preparing the current collector |
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