CN112542566A - Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof - Google Patents

Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof Download PDF

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Publication number
CN112542566A
CN112542566A CN201910895156.3A CN201910895156A CN112542566A CN 112542566 A CN112542566 A CN 112542566A CN 201910895156 A CN201910895156 A CN 201910895156A CN 112542566 A CN112542566 A CN 112542566A
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China
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positive electrode
aluminum
layers
layer
electrode layer
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Inventor
颜世银
刘春洋
陈若凡
薛佳宸
李素丽
徐延铭
李俊义
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Zhuhai Cosmx Battery Co Ltd
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Zhuhai Cosmx Battery Co Ltd
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Priority to CN201910895156.3A priority Critical patent/CN112542566A/en
Publication of CN112542566A publication Critical patent/CN112542566A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • 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
    • H01M4/139—Processes of manufacture
    • 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
    • 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
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a positive plate for improving the rate capability of a lithium ion battery, and a preparation method and application thereof. Meanwhile, the loading capacity of the active substances of the positive electrode can be increased to a certain extent, and the energy density of the battery is improved. The lithium ion battery positive plate provided by the invention is simple to operate, easy to commercialize, and obvious in effect of improving the rate capability of the battery and solving the problem of high positive plate density impedance.

Description

Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive plate for improving the rate capability of a lithium ion battery, and a preparation method and application thereof.
Background
Electronic products which are mainly composed of an electric tool, an electronic cigarette, an unmanned aerial vehicle, a start-stop power supply and the like have high requirements on the rate capability of a lithium ion battery due to the requirement of rapid discharge. With the continuous development of the market and the improvement of the consumption concept of people, the energy density of the lithium ion battery is more and more required on the basis of meeting the high-rate discharge.
In order to improve the rate discharge performance of the lithium ion battery, on one hand, the conductivity of the anode material is improved through an anode formula and the like, and the impedance of an anode plate is reduced so as to reduce the polarization of the battery; on the other hand, the battery multiplying power discharge performance is improved by reducing the active material carrying capacity and the pole piece surface density, and the battery impedance and the battery polarization are reduced at the end.
However, the above methods are not favorable for increasing the energy density of the battery.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a positive plate for improving the rate capability of a lithium ion battery, and a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a positive plate comprises a current collector, an aluminum net and a positive layer;
the surface of one side or two sides of the current collector is provided with at least one layer of aluminum net and at least two layers of positive electrode layers, and the at least two layers of positive electrode layers and the at least one layer of aluminum net are sequentially and alternately arranged on the surface of the current collector.
According to the invention, the at least two anode layers and the at least one aluminum net are alternately arranged on the surface of the current collector in sequence according to the order of the anode layers, the aluminum net, … … and the anode layers, and the outermost layer is the anode layer.
According to the invention, at least one layer of aluminum mesh and at least two layers of positive electrode layers are arranged on one side surface or two side surfaces of the current collector, and preferably two side surfaces are arranged on the two side surfaces.
According to the invention, one side or two sides of the current collector are provided with 1-10 layers of aluminum nets and 2-11 layers of positive electrode layers, for example, 1-8 layers of aluminum nets and 2-9 layers of positive electrode layers, for example, 1-6 layers of aluminum nets and 2-7 layers of positive electrode layers, 1-4 layers of aluminum nets and 2-5 layers of positive electrode layers, for example, 1-3 layers of aluminum nets and 2-4 layers of positive electrode layers, for example, 1-2 layers of aluminum nets and 2-3 layers of positive electrode layers.
Illustratively, the positive plate comprises a current collector, an aluminum net, a positive layer X and a positive layer Y, wherein the positive layer X is arranged on the surface of one side or two sides of the current collector, the aluminum net is arranged on the surface of the positive layer X, and the positive layer Y is arranged on the surface of the aluminum net.
Exemplarily, the positive plate comprises a current collector, an aluminum mesh A, an aluminum mesh B, a positive layer X, a positive layer Y and a positive layer Z, wherein the positive layer X is arranged on the surface of one side or two sides of the current collector, the aluminum mesh A is arranged on the surface of the positive layer X, the positive layer Y is arranged on the surface of the aluminum mesh A, the aluminum mesh B is arranged on the surface of the positive layer Y, and the positive layer Z is arranged on the surface of the aluminum mesh B.
According to the invention, the positive electrode layer is prepared from the following raw materials:
(a) 80-99.5 wt% of positive electrode active material; (b) 0-10 wt% of conductive agent; (c) 0.5-10 wt% of binder.
Illustratively, the additive amount of the positive electrode active material is 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 90 wt%, 95 wt%, 96 wt%, 96.5 wt%, 97 wt%, 97.2 wt%, 97.5 wt%, 97.8 wt%, 98 wt%, 98.2 wt%, 98.5 wt%, 99 wt%, 99.5 wt%;
illustratively, the conductive agent is added in an amount of 0.5 wt%, 1 wt%, 1.5 wt%, 2 t%, 3 wt%, 4 wt%, 5 wt%, 7 wt%, 10 wt%;
illustratively, the binder is added in an amount of 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 1.8 t%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 8 wt%, 10 wt%.
According to the present invention, the positive electrode active material is at least one selected from lithium cobaltate, lithium manganate, lithium iron phosphate, NCM ternary material, and the like.
According to the invention, the conductive agent is selected from one or more of super P, carbon nano tube, carbon black and the like which can be used in the positive electrode conductive agent material.
According to the invention, the binder is selected from one or more of positive electrode binder materials for lithium ion batteries such as SBR and PVDF.
According to the present invention, the thickness of the positive electrode layer is 10 to 200 μm. For example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm.
According to the present invention, the thickness of each positive electrode layer is the same or different, and preferably the same for the sake of manufacturing convenience.
According to the present invention, the composition of each positive electrode layer is the same or different, that is, the positive electrode mixed slurry for each positive electrode layer may be the positive electrode mixed slurry with the same composition and content, or may be the positive electrode mixed slurry with different composition and content, and the positive electrode mixed slurry with different composition and content, for example, includes at least one of the positive electrode active material or different content thereof, the conductive agent or different content thereof, and the binder or different content thereof.
According to the invention, the current collector is selected from aluminium foil, for example one of porous aluminium foil or etched aluminium foil.
According to the invention, the thickness of the current collector is 8-15 μm, for example 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm.
According to the invention, the mesh number of the aluminium mesh is 100 mesh to 1000 mesh and the thickness is 6 μm to 25 μm, such as 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm.
According to the invention, the aluminum mesh and the current collector are connected (e.g. welded) by an aluminum strip; the number of the aluminum strips can be one or more.
The invention also provides a preparation method of the positive plate, which comprises the following steps:
(1) coating a positive electrode layer on at least one side surface of the current collector;
(2) arranging an aluminum net on the surface of the positive electrode layer, and coating the positive electrode layer on the surface of the aluminum net;
(3) optionally repeating step (2) at least once, for example 1-10 times;
(4) and connecting the current collector with an aluminum net by using an aluminum tape to prepare the positive plate.
According to the invention, the step (1) is specifically as follows: and coating mixed slurry comprising a positive electrode active material, a conductive agent and a binder on at least one side surface of the current collector, and drying to prepare the positive electrode layer.
According to the invention, the step (4) is specifically as follows: and (3) welding the current collector with the aluminum mesh (all aluminum meshes) by using an aluminum strip to prepare the positive plate.
The invention also provides application of the positive plate, which is used for preparing a lithium ion battery.
The invention also provides a lithium ion battery which comprises the positive plate.
According to the invention, the lithium ion battery further comprises a negative plate, a diaphragm and electrolyte.
The graphite, hard carbon, silicon and the like adopted by the negative plate can be used as conventional materials of the negative electrode of the lithium ion battery. The diaphragm and the electrolyte are both conventional materials for lithium ion batteries.
In the present invention, the applicant has unexpectedly found that the arrangement of at least one aluminum mesh in the positive electrode sheet according to the present invention does not hinder lithium ions from entering the electrolyte from, for example, at least two positive electrode layers, and ensures the exit path of lithium ions; on the other hand, after the aluminum net is connected with the current collector, the aluminum net is equivalent to the second layer of current collector, so that the polarization of the positive plate is greatly reduced, and meanwhile, the impedance of the positive plate is effectively reduced, so that the dynamic performance of the positive plate is improved; meanwhile, due to the existence of the double-layer current collector, the active material loading capacity of the whole positive plate can be increased, namely, the surface density of the positive plate is improved, so that the volume energy density of the battery is favorably improved.
The invention has the beneficial effects that:
the invention provides a positive plate for improving the rate capability of a lithium ion battery, and a preparation method and application thereof. Meanwhile, the loading capacity of the active substances of the positive electrode can be increased to a certain extent, and the energy density of the battery is improved. The lithium ion battery positive plate provided by the invention is simple to operate, easy to commercialize, and obvious in effect of improving the rate capability of the battery and solving the problem of high positive plate density impedance.
Drawings
Fig. 1 is a front view of a positive electrode sheet of the present invention.
Fig. 2 is a plan view of the positive electrode sheet of the present invention.
Fig. 3 shows the resulting impedance set of the positive plate of the present invention.
Fig. 4 shows the discharge performance of the lithium ion battery prepared by the positive plate of the present invention under different multiplying factors.
Reference numerals: 1 is a current collector; 2 is an aluminum strip connection point; 3 is an aluminum mesh; 4 is a positive electrode layer X; 5 is a positive electrode layer Y; and 6 is a positive electrode tab.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The aluminum mesh used in the following examples was selected from those having a mesh number of 500 and a thickness of 10 μm.
Comparative example 1
Preparing anode slurry:
adding 96.0 wt% of positive electrode active material lithium cobaltate, 2.0 wt% of binder PVDF, 2.0 wt% of conductive agent Super P and a certain amount of NMP into a planetary stirring tank, stirring for 5 hours at a stirring speed of revolution of 35Hz and dispersion of 1800Hz, and fully mixing to prepare positive electrode slurry with the discharge viscosity of 5000 mPa.s.
And coating the positive electrode slurry on the two side surfaces of the current collector layer with the thickness of 10 microns, and drying in a vacuum drying oven at 95 ℃ to obtain the positive electrode layer with the thickness of 150 microns of the single-side coating layer.
The negative active material of the selected negative plate is graphite, the diaphragm is a conventional substrate diaphragm for a lithium battery, and the electrolyte is commercial liquid electrolyte for the lithium battery.
And (3) preparing the positive plate, the negative plate and the diaphragm which are prepared by adopting a winding process and matching with liquid electrolyte to prepare the lithium ion battery.
Example 1
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is not changed; namely, during coating, coating a positive electrode layer with the thickness of 75 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; then coating an anode layer named as an anode layer Y with the thickness of 75 microns on the aluminum net, welding the aluminum net and a current collector together by using an aluminum tape, and baking for 8 hours in vacuum at 95 ℃ to obtain an anode plate, wherein as shown in figure 1, an anode layer X5, an aluminum net 3 and an anode layer Y5 are respectively arranged on two sides of the current collector 1; and the aluminum net 3 is connected with the current collector 1 through the aluminum strip connection point 2, and the anode further comprises an anode tab 6.
Example 2
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is thickened; namely, during coating, coating a layer of positive electrode layer with the thickness of 80 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; and then coating an anode layer with the thickness of 80 mu m on the aluminum net, namely an anode layer Y, welding the aluminum net and a current collector together by using an aluminum strip, and baking for 8 hours in vacuum at 95 ℃ to obtain the anode plate.
Example 3
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is thickened; namely, during coating, coating a positive electrode layer with the thickness of 85 microns on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; and then coating an anode layer with the thickness of 85 microns on the aluminum net, namely an anode layer Y, welding the aluminum net and a current collector together by using an aluminum strip, and baking for 8 hours at 95 ℃ in vacuum to obtain the anode plate.
Example 4
The other parts are the same as the comparative example 1, except that two layers of aluminum nets are inserted into the positive electrode layer, and the total thickness of the positive electrode layer is the same as the comparative example 1; namely, during coating, coating a positive electrode layer with the thickness of 50 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net A on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; then coating a positive electrode layer named as a positive electrode layer Y with the thickness of 50 microns on the aluminum mesh A, adding a layer of aluminum mesh B on the surface of the positive electrode layer Y, and carrying out vacuum baking for 2-4h at 95 ℃; and coating a positive electrode layer with the thickness of 50 microns on the surface of the aluminum mesh B, namely a positive electrode layer Z, welding the aluminum mesh A, the aluminum mesh B and a current collector together by using an aluminum strip, and baking for 8 hours at 95 ℃ in vacuum to obtain the positive electrode plate.
The positive electrode sheets obtained in comparative example 1 and examples 1 to 4 were subjected to a sheet resistance test (test using a four-probe tester) under the same conditions, and the data are shown in fig. 3. Meanwhile, the lithium ion batteries prepared from the positive electrode sheets of comparative example 1 and examples 1 to 4 were subjected to discharge performance tests under different rate conditions, as shown in fig. 4.
The discharge performance test comprises the steps of fully charging the battery at a constant current and a constant voltage, and then discharging the battery at a current of 0.2C to obtain the battery capacity under the discharge of 0.2C; the test conditions of other multiplying power discharge are the same as above, and the difference is that the discharge current is different; and obtaining the discharge performance data under different multiplying power conditions according to the ratio of the battery capacity under different multiplying power discharge to the battery capacity under 0.2C multiplying power.
The test result shown in fig. 3 shows that the positive plate of the invention has smaller pole piece impedance, when the thickness of the positive plate coating is increased, the pole piece impedance is increased, but the positive plate still has advantages compared with the comparative example, which shows that the positive plate of the invention supports higher positive active material loading capacity, improves the surface density of the positive plate, and is beneficial to improving the energy density of the battery; two layers of aluminum nets are added, the pole piece impedance is reduced more obviously, and the introduction of the multiple layers of aluminum nets can reduce the pole piece impedance better, so that the polarization of the battery is reduced, and the cycle performance of the battery is improved.
The test result shown in fig. 4 shows that the lithium ion battery prepared by the positive plate of the invention has better rate discharge performance, and has significant advantages in the direction of large rate discharge performance requirements of electric tools, start-stop power supplies and the like.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A positive plate comprises a current collector, an aluminum net and a positive layer;
the surface of one side or two sides of the current collector is provided with at least one layer of aluminum net and at least two layers of positive electrode layers, and the at least two layers of positive electrode layers and the at least one layer of aluminum net are sequentially and alternately arranged on the surface of the current collector.
2. The positive electrode sheet according to claim 1, wherein the at least two positive electrode layers and the at least one aluminum mesh are alternately arranged on the surface of the current collector in the order of the positive electrode layer, the aluminum mesh, … … and the positive electrode layer, and the outermost layer is the positive electrode layer.
3. The positive electrode sheet according to claim 1 or 2, wherein the current collector is provided with 1-10 layers of aluminum mesh and 2-11 layers of positive electrode layer on one or both surfaces, for example, 1-8 layers of aluminum mesh and 2-9 layers of positive electrode layer, for example, 1-6 layers of aluminum mesh and 2-7 layers of positive electrode layer, 1-4 layers of aluminum mesh and 2-5 layers of positive electrode layer, for example, 1-3 layers of aluminum mesh and 2-4 layers of positive electrode layer, for example, 1-2 layers of aluminum mesh and 2-3 layers of positive electrode layer.
4. The positive electrode sheet according to any one of claims 1 to 3, wherein the positive electrode sheet comprises a current collector, an aluminum mesh, a positive electrode layer X and a positive electrode layer Y, wherein the positive electrode layer X is arranged on one or two surfaces of the current collector, the aluminum mesh is arranged on the surface of the positive electrode layer X, and the positive electrode layer Y is arranged on the surface of the aluminum mesh;
or, the positive plate includes mass flow body, aluminium net A, aluminium net B, positive pole layer X, positive pole layer Y and positive pole layer Z, mass flow body one side or both sides surface set up positive pole layer X, positive pole layer X surface sets up aluminium net A, aluminium net A surface sets up positive pole layer Y, positive pole layer Y surface sets up aluminium net B, aluminium net B surface sets up positive pole layer Z.
5. The positive electrode sheet according to any one of claims 1 to 4, wherein the positive electrode layer is prepared from raw materials comprising:
(a) 80-99.5 wt% of positive electrode active material; (b) 0-10 wt% of conductive agent; (c) 0.5-10 wt% of binder.
6. The positive electrode sheet according to any one of claims 1 to 5, wherein the thickness of the positive electrode layer is 10 to 200 μm;
preferably, the current collector is selected from aluminum foil, for example, one of porous aluminum foil or etched aluminum foil;
preferably, the mesh number of the aluminum mesh is 100-1000 meshes, and the thickness is 6-25 μm;
preferably, the aluminum mesh is connected with the current collector by an aluminum strip; the number of the aluminum strips is one or more.
7. The method for producing a positive electrode sheet according to any one of claims 1 to 6, wherein the method comprises the steps of:
(1) coating a positive electrode layer on at least one side surface of the current collector;
(2) arranging an aluminum net on the surface of the positive electrode layer, and coating the positive electrode layer on the surface of the aluminum net;
(3) optionally repeating step (2) at least once, for example 1-10 times;
(4) and connecting the current collector with an aluminum net by using an aluminum tape to prepare the positive plate.
8. The preparation method according to claim 7, wherein the step (1) is specifically: coating mixed slurry comprising a positive electrode active material, a conductive agent and a binder on at least one side surface of a current collector, and drying to prepare a positive electrode layer;
the step (4) is specifically as follows: and welding the current collector and the aluminum net by using an aluminum strip to prepare the positive plate.
9. Use of the positive electrode sheet according to any one of claims 1 to 6 for the production of a lithium ion battery.
10. A lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 6.
CN201910895156.3A 2019-09-20 2019-09-20 Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof Pending CN112542566A (en)

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Application Number Priority Date Filing Date Title
CN201910895156.3A CN112542566A (en) 2019-09-20 2019-09-20 Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof

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Application Number Priority Date Filing Date Title
CN201910895156.3A CN112542566A (en) 2019-09-20 2019-09-20 Positive plate for improving rate capability of lithium ion battery and preparation method and application thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116314598A (en) * 2023-05-26 2023-06-23 江苏正力新能电池技术有限公司 Dry electrode slice and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116314598A (en) * 2023-05-26 2023-06-23 江苏正力新能电池技术有限公司 Dry electrode slice and preparation method and application thereof
CN116314598B (en) * 2023-05-26 2023-09-08 江苏正力新能电池技术有限公司 Dry electrode slice and preparation method and application thereof

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