CN115548271A - Positive pole piece, preparation method thereof and lithium ion battery - Google Patents
Positive pole piece, preparation method thereof and lithium ion battery Download PDFInfo
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- 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
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- 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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- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive pole piece, a preparation method thereof and a lithium ion battery, wherein the preparation method of the positive pole piece comprises the following steps: slurry mixing procedure: mixing and dispersing a positive electrode material, a binder, a conductive agent and an organic solvent to obtain a first slurry; centrifuging and drying: centrifuging the first slurry to obtain a second slurry and a first solvent, and drying the second slurry to obtain a first mixed material; a fiberization treatment process: performing fiberization treatment on the first mixed material to obtain a second mixed material; a tabletting process: and pressing the second mixture onto a current collector after a film pressing process, or spraying the second mixture onto the surface of the current collector to obtain the positive pole piece. Compared with a dry method anode plate, the preparation method provided by the invention obviously improves the peeling strength of the anode plate.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive pole piece, a preparation method thereof and a lithium ion battery.
Background
The cell of the battery is manufactured by winding or laminating a positive plate, a negative plate and a diaphragm. With the development of battery manufacturing technology, dry-process preparation of electrode plates is widely accepted by researchers in the battery field. The dry electrode preparation process does not use any solvent, combines the electrode material, the conductive agent and the binding agent into a whole by means of a network structure formed by the fibrillatable macromolecules, and then presses the electrode material, the conductive agent and the binding agent into the pole piece by hot rolls.
In the prior art, not all polymers capable of being fiberized have good fiberization degree, for example, PVDF (polyvinylidene fluoride) has poor fiberization degree and cannot powerfully support mixed materials, so that the prepared pole piece has low peel strength; in addition, in order to achieve higher peel strength, the dry-method preparation of the electrode plate has high requirement on the content of the binder, so that the energy density of the battery is lower.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the positive pole piece, the preparation method thereof and the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a positive pole piece, which comprises the following steps:
slurry mixing procedure: mixing and dispersing a positive electrode material, a binder, a conductive agent and an organic solvent to obtain a first slurry;
centrifuging and drying: centrifuging the first slurry to obtain a second slurry and a first solvent, and drying the second slurry to obtain a first mixed material;
a fiberization treatment process: performing fiberization treatment on the first mixed material to obtain a second mixed material;
a tabletting process: and pressing the second mixed material onto a current collector after a film pressing process, or spraying the second mixed material onto the surface of the current collector to obtain the positive pole piece.
According to the invention, the first slurry is prepared by using the traditional process for preparing the anode slurry, then the first slurry is centrifuged and dried to obtain the first mixed material, and the first mixed material is subjected to fibrosis treatment to prepare the anode piece.
In the above method for producing a positive electrode sheet, as a preferred embodiment, the first solvent is recovered in the step of centrifuging and drying.
In the above method for preparing a positive electrode plate, as a preferred embodiment, the pressing the second mixture onto the current collector after the film pressing process includes: and after the second mixed material is made into an electrode diaphragm through hot-pressing roller equipment, pressing the electrode diaphragm onto a current collector through a hot-pressing roller.
In the above method for preparing a positive electrode plate, as a preferred embodiment, in the step of slurry mixing step, according to a dry slurry mixing process, a wet slurry mixing process or a ball milling slurry mixing process, a positive electrode material, a binder, a conductive agent and an organic solvent are mixed and dispersed to obtain a first slurry.
The dry slurry mixing process, the wet slurry mixing process and the ball milling slurry mixing process are all conventional slurry mixing processes.
In the above method for preparing a positive electrode sheet, as a preferred embodiment, the conductive agent includes a conductive agent a and a conductive agent B, and the dry slurry mixing process includes the following steps: adding the cathode material, the binder and the conductive agent A into a stirring tank to perform first stirring dispersion, then adding the organic solvent to perform second stirring dispersion, finally adding the conductive agent B to perform third stirring dispersion to obtain a first slurry, wherein the first stirring dispersion has a revolution speed of 30-50rpm (for example, 30rpm, 35rpm, 40rpm, 45rpm, 50rpm and the like), a dispersion speed of 0rmp, a stirring time of 30-60min (for example, 30min, 40min, 50min, 60min and the like), and the second stirring dispersion has a revolution speed of 30-50rpm (for example, 30rpm, 35rpm, 40rpm, 45rpm, 50rpm and the like), the dispersion speed is 3000-4000rpm (for example, 3000rpm, 3200rpm, 3400rpm, 3600rpm, 4000rpm and the like may be possible), the stirring time is 30-90min (for example, 30min, 40min, 50min, 90min and the like may be possible), the revolution speed of the third stirring dispersion is 30-40rpm (for example, 30rpm, 32rpm, 34rpm, 37rpm, 40rpm and the like may be possible), the dispersion speed is 3500-4200rpm (for example, 3500rpm, 3700rpm, 3900rpm, 4200rpm and the like may be possible), the stirring time is 90-240min (for example, 90min, 120min, 150min, 240min and the like may be possible), the conductive agent B is added in the form of a conductive agent slurry, and the solid content of the conductive agent slurry of the conductive agent B is 4-6%.
In the above method for preparing a positive electrode plate, as a preferred embodiment, the conductive agent includes a conductive agent a and a conductive agent B, and the wet slurry mixing process includes the following steps: mixing the binder and part of the organic solvent, performing fourth stirring dispersion to obtain a glue solution, then adding the conductive agent B and the conductive agent A into the glue solution, performing fifth stirring dispersion, finally adding the cathode material and the rest of the organic solvent, and performing sixth stirring dispersion to obtain a first slurry, wherein the revolution speed of the fourth stirring dispersion is 30-50rpm (for example, 30rpm, 35rpm, 40rpm, 45rpm or 50rpm and the like), the dispersion speed is 2500-3500rpm (for example, 2500rpm, 2700rpm, 2900rpm, 3300rpm or 3500rpm and the like), the stirring time is 90-180min (for example, 90min, 120min, 140min, 160min or 180min and the like), the solid content of the glue solution is 5-8% (for example, 5%, 6%, 7% or 8%, etc.), the conductive agent B is added in the form of conductive agent slurry, the solid content of the conductive agent slurry of the conductive agent B is 4-6%, the revolution speed of the fifth stirring dispersion is 30-40rpm, the dispersion speed is 3500-4000rpm (for example, 3500rpm, 3700rpm, 3900rpm or 4000rpm, etc.), the stirring time is 30-60min (for example, 30min, 40min, 50min or 60min, etc.), the revolution speed of the sixth stirring dispersion is 35-45rpm (for example, 35rpm, 37rpm, 39rpm, 41rpm or 45rpm, etc.), the dispersion speed is 4000-4200rpm, and the stirring time is 120-180min (for example, 120min, 140min, 160min or 180min, etc.).
In the above method for preparing a positive electrode plate, as a preferred embodiment, the conductive agent includes a conductive agent a and a conductive agent B, and the ball milling slurry mixing process includes the following steps: the positive electrode material, the binder and the conductive agent a are added into a ball mill for ball milling, and then transferred into a stirring tank, and the first slurry is prepared by referring to a dry slurry mixing process, wherein the ball milling rotation speed is 200 to 400rpm (for example, 200rpm, 250 rpm, 300rpm, 350 rpm, or 400rpm, etc.), the ball-to-material ratio is (2.
The conductive agent A and the conductive agent B of the present invention may be the same or different.
In the above method for preparing the positive electrode plate, as a preferred embodiment, the positive electrode material includes at least one of a nickel-cobalt-manganese ternary material (lithium nickel cobalt manganese), lithium iron phosphate, lithium iron manganese phosphate, and lithium cobalt oxide.
In the above method for preparing a positive electrode sheet, as a preferred embodiment, the conductive agent includes at least one of acetylene black, carbon nanotubes, graphene, and carbon fibers.
In the above method for preparing a positive electrode sheet, as a preferred embodiment, the conductive agent a includes at least one of acetylene black, graphene, and carbon fiber.
In the above method for preparing a positive electrode plate, as a preferred embodiment, the conductive agent B includes a carbon nanotube.
In the above method for preparing a positive electrode plate, as a preferred embodiment, the organic solvent is N-methylpyrrolidone (NMP).
In the above method for manufacturing a positive electrode plate, as a preferred embodiment, the binder is polyvinylidene fluoride (PVDF, HSV900, 5130).
In the above method for preparing a positive electrode plate, as a preferred embodiment, the mass ratio of the positive electrode material, the conductive agent and the binder is (90-98): (0.5-6): (0.5-8), and the sum of all the quantities in the mass ratio of the three is 100; namely, the mass fraction of the positive electrode material in the total dry material is 90-98%, the mass fraction of the conductive agent in the total dry material is 0.5-6%, the mass fraction of the binder in the total dry material is 0.5-8%, and the total dry material is the sum of the masses of the positive electrode material, the conductive agent and the binder.
In the above method for preparing a positive electrode plate, as a preferred embodiment, the mass ratio of the positive electrode material, the conductive agent and the binder is (96-98): (0.5-2): (0.5-2).
The positive pole piece provided by the embodiment of the invention has high peel strength and high content of positive pole materials, and the lithium ion battery prepared from the positive pole piece has high energy density.
In the above method for preparing the positive electrode sheet, as a preferred embodiment, in the step of centrifuging and drying, the type of the centrifuge used for centrifuging includes one of a three-leg centrifuge, a horizontal spiral centrifuge, a disk-type centrifuge and a tubular centrifuge.
In the above method for producing a positive electrode sheet, as a preferred embodiment, in the step of the centrifugation and drying process, the rotation speed of the centrifuge used for the centrifugation is 1000 to 50000rpm, and for example, the rotation speed may be 1000rpm, 5000rpm, 10000rpm, 1000rpm, 15000rpm, 20000rpm, 25000rpm, 30000rpm, 40000rpm, 50000rpm, or the like.
In a preferred embodiment of the method for manufacturing a positive electrode sheet, in the step of centrifuging and drying, the centrifuging time is 10 to 240min, for example, 10min, 30min, 60min, 80min, 100min, 150min, 200min, or 240min.
In the above method for manufacturing a positive electrode sheet, as a preferred embodiment, in the step of centrifuging and drying, the drying method includes one of drying under normal pressure, drying under reduced pressure, and freeze-drying.
In the above method for preparing a positive electrode sheet, as a preferred embodiment, the temperature of the atmospheric drying is 85 to 130 ℃, for example, the temperature may be 85 ℃, 100 ℃, 110 ℃, 120 ℃ or 130 ℃.
In the above method for producing a positive electrode sheet, in a preferred embodiment, the pressure of the reduced pressure drying is-0.06 to-0.08 MPa (for example, -0.06MPa, -0.07MPa or-0.08 MPa), and the temperature is 50 to 90 ℃ (for example, the temperature may be 50 ℃, 60 ℃, 70 ℃, 80 ℃ or 90 ℃).
In the above method for producing a positive electrode sheet, as a preferred embodiment, the temperature of the freeze-drying is-10 ℃ to-100 ℃ (for example, -10 ℃, -20 ℃, -40 ℃, -60 ℃, -80 ℃, or-100 ℃), the absolute pressure is 0 to 10000Pa (for example, 0Pa, 1000Pa, 2000Pa, 3000Pa, 4000Pa, 5000Pa, 6000Pa, 7000Pa, 8000Pa, 9000Pa, or 10000 Pa), and the time is 2 to 4 hours.
In the above method for producing a positive electrode sheet, as a preferred embodiment, the solid content of the first slurry is 40% to 60%, and may be, for example, 40%, 42%, 44%, 46%, 48%, 50%, 55%, 60%, or the like.
In the above method for preparing a positive electrode sheet, as a preferred embodiment, the temperature of the hot press roll is 50 to 150 ℃, for example, the temperature may be 50 ℃, 70 ℃, 90 ℃, 110 ℃, 130 ℃ or 150 ℃.
In a preferred embodiment of the above method for manufacturing a positive electrode sheet, the current collector is a carbon-coated aluminum foil, the aluminum foil has a thickness of 10 to 15 μm (for example, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm), carbon-coated layers are respectively provided on both sides of the aluminum foil, and the total thickness of the carbon-coated layers is 2 to 4 μm (for example, 2 μm, 3 μm, or 4 μm).
In the above method for producing a positive electrode sheet, as a preferred embodiment, in the step of the fiberization treatment process, the fiberization is jet milling or ultra-high-speed shearing.
In a preferred embodiment of the above method for producing a positive electrode sheet, the jet milling has a jet pressure of 0.1Mpa to 1Mpa (for example, 0.1Mpa, 0.3Mpa, 0.5Mpa, 0.7Mpa, or 1 Mpa), and a time of 20 to 240min (for example, 20min, 50min, 100min, 120min, 160min, 200min, or 240 min).
In the above method for preparing the positive electrode sheet, as a preferred embodiment, the ultra-high shear rate is 1000 to 8000rpm (for example, 1000rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, 6000rpm, 7000rpm, 8000rpm, etc.), and the time is 30 to 180min (for example, 30min, 60min, 90min, 120min, 150min, 180min, etc.).
In the above method for manufacturing a positive electrode sheet, as a preferred embodiment, in the sheet manufacturing step, the positive electrode sheet includes a current collector and an electrode membrane layer attached to a surface of the current collector, and the thickness of the electrode membrane layer is 100um to 400um (for example, 100um, 200um, 300um, or 400um may be used).
In a second aspect, the invention provides a positive pole piece, which is prepared by the preparation method of the positive pole piece provided in the first aspect.
In a third aspect, the invention provides a lithium ion battery, which comprises the positive electrode plate of the second aspect.
Compared with the prior art, the beneficial effects of the invention at least comprise one of the following items:
(1) According to the invention, the first slurry is prepared by using the traditional process for preparing the anode slurry, then the first slurry is centrifuged and dried to obtain the first mixed material, and the first mixed material is subjected to fibrosis treatment to prepare the anode piece.
(2) The invention uses the traditional slurry mixing procedure for preparing the battery, uniformly disperses the conductive agent and the binder of the battery among the active materials, and solves the problem of non-uniform mixing in the traditional dry-method electrode manufacturing process.
(3) Conventional dry electrode preparation processes have no means of using liquid or gel-like conductive agents, and the type of conductive agent of the present invention is not limited.
(4) Conventional dry electrode preparation generally requires a relatively high binder content in order to increase the peel strength of the electrode sheet and thus the cycle life of the battery, which reduces the proportion of active material and thus the energy density of the battery.
(5) The preparation method of the positive pole piece provided by the invention has the advantages that the organic solvent is easy to recover, no pollution is caused, a coating process is not needed, the waste of slurry in the coating process is reduced, and the production cost is reduced.
Drawings
FIG. 1 is a flow chart of a wet slurry mixing process adopted in embodiment 1 of the present invention;
FIG. 2 is a flow chart of the dry pulp mixing process adopted in embodiment 2 of the present invention;
FIG. 3 is a flow chart of a ball-milling slurry-mixing process adopted in example 3 of the present invention;
FIG. 4 is a flow chart of a method for preparing the positive electrode sheet provided by the present invention;
fig. 5 is a schematic structural diagram of the positive electrode sheet provided by the present invention.
Wherein the reference numerals are as follows:
1. an electrode membrane layer; 2, coating a carbon layer; 3. aluminum foil.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the present invention are described below in conjunction with the following examples, and the scope of the present application includes, but is not limited to, the following examples. The following examples are only for illustrating the advantages and effects of the technical solutions of the present application and do not limit the scope of protection of the present application. Equivalents may be substituted for those skilled in the art based on the teachings herein without departing from the scope of the present application.
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The experimental reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the dosage of the experimental reagent is the dosage of the reagent in the conventional experimental operation if no special description exists; the experimental methods are all conventional methods unless otherwise specified.
In a first aspect, fig. 4 is a flowchart of a method for manufacturing a positive electrode plate according to an embodiment of the present invention, and as shown in fig. 4, the method for manufacturing a positive electrode plate according to the embodiment of the present invention includes the following steps:
s1, pulp mixing: mixing and dispersing a positive electrode material, a binder, a conductive agent and an organic solvent according to a dry slurry mixing process, a wet slurry mixing process or a ball-milling slurry mixing process to obtain first slurry, wherein the conductive agent comprises a conductive agent A and a conductive agent B, and the dry slurry mixing process comprises the following steps: adding the positive electrode material, the binder and the conductive agent A into a stirring tank to carry out first stirring dispersion, then adding the organic solvent to carry out second stirring dispersion, and finally adding the conductive agent B to carry out third stirring dispersion to obtain first slurry, wherein the revolution speed of the first stirring dispersion is 30-50rpm, the dispersion speed is 0rmp, the stirring time is 30-60min, the revolution speed of the second stirring dispersion is 30-50rpm, the dispersion speed is 3000-4000rpm, the stirring time is 30-90min, the revolution speed of the third stirring dispersion is 30-40rpm, the dispersion speed is 3500-4200rpm, the stirring time is 90-240min, the conductive agent B is added in the form of conductive agent slurry, and the solid content of the conductive agent slurry of the conductive agent B is 4-6%; the wet pulp mixing process comprises the following steps: mixing the binder and part of the organic solvent, performing fourth stirring dispersion to obtain a glue solution, then adding the conductive agent B and the conductive agent A into the glue solution, performing fifth stirring dispersion, finally adding the positive electrode material and the rest of the organic solvent, and performing sixth stirring dispersion to obtain a first slurry, wherein the revolution speed of the fourth stirring dispersion is 30-50rpm, the dispersion speed is 2500-3500rpm, the stirring time is 90-180min, the solid content of the glue solution is 5-8%, the conductive agent B is added in the form of conductive agent slurry, the solid content of the conductive agent slurry of the conductive agent B is 4-6%, the revolution speed of the fifth stirring dispersion is 30-40rpm, the dispersion speed is 3500-4000rpm, the stirring time is 30-60min, the revolution speed of the sixth stirring dispersion is 35-45rpm, the dispersion speed is 4000-4200rpm, and the stirring time is 120-180min; the ball milling and slurry mixing process comprises the following steps: adding the positive electrode material, the binder and the conductive agent A into a ball mill for ball milling, then transferring into a stirring tank, and preparing first slurry by referring to a dry slurry mixing process, wherein the ball milling speed is 200-400 r/min, the ball-to-material ratio is (2; the positive electrode material comprises at least one of nickel cobalt manganese ternary material (nickel cobalt lithium manganate), lithium iron phosphate, lithium iron manganese phosphate and lithium cobaltate; the conductive agent comprises at least one of acetylene black, carbon nanotubes, graphene and carbon fibers; the conductive agent A comprises at least one of acetylene black, graphene and carbon fiber; the conductive agent B comprises carbon nanotubes; the organic solvent is N-methylpyrrolidone (NMP); the binder is polyvinylidene fluoride (PVDF, HSV900, 5130); the mass ratio of the positive electrode material to the conductive agent to the binder is (90-98): (0.5-6): (0.5-8); the solid content of the first slurry is 40-60%.
S2, centrifuging and drying: centrifuging the first slurry to obtain a second slurry and a first solvent, drying the second slurry to obtain a first mixed material, and recovering the first solvent to recycle the first solvent, wherein the type of the centrifuge used for centrifuging comprises one of a three-leg centrifuge, a horizontal spiral centrifuge, a disc centrifuge and a tubular centrifuge; the rotating speed of the centrifuge used for centrifugation is 1000-50000rpm, and the centrifugation time is 10-240min; the drying mode comprises one of normal pressure drying, reduced pressure drying and freeze drying; the temperature of the normal pressure drying is 85-130 ℃, the pressure of the reduced pressure drying is-0.06 to-0.08 MPa, and the temperature is 50-90 ℃; the temperature of the freeze drying is-10 ℃ to-100 ℃, the absolute pressure is 0-10000Pa, and the time is 2-4h.
S3, a fiberization treatment process: performing fiberization treatment on the first mixed material to obtain a second mixed material, wherein the fiberization mode is jet milling or ultrahigh-speed shearing; the airflow pressure of the airflow pulverization is 0.1Mpa-1Mpa, and the time is 20-240min; the ultra-high speed shearing speed is 1000-8000rpm, and the time is 30-180min.
S4, a tabletting process: after the second mixture is made into an electrode diaphragm through hot-pressing roller equipment, the electrode diaphragm is pressed on a current collector through the hot-pressing roller, or the second mixture is sprayed on the surface of the current collector to obtain a positive pole piece, wherein the temperature of the hot-pressing roller is 50-150 ℃; the current collector is a carbon-coated aluminum foil, the thickness of the aluminum foil is 10-15 mu m, carbon coating layers are respectively arranged on two surfaces of the aluminum foil, and the total thickness of the carbon coating layers is 2-4 mu m; the positive pole piece comprises a current collector and an electrode membrane layer attached to the surface of the current collector, and the thickness of the electrode membrane layer is 100-400 um.
In a second aspect, fig. 5 is a schematic structural diagram of a positive electrode plate provided by the present invention, and as shown in fig. 5, an embodiment of the present invention provides a positive electrode plate, where the positive electrode plate is manufactured by the method for manufacturing a positive electrode plate provided in the first aspect, the positive electrode plate includes a current collector and an electrode membrane layer 1, and the current collector includes a carbon coating layer 2 and an aluminum foil 3.
In a third aspect, an embodiment of the present invention provides a lithium ion battery, where the lithium ion battery includes the positive electrode tab of the second aspect.
For further understanding of the present invention, the following describes the positive electrode plate, the preparation method thereof and the lithium ion battery in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
The preparation method of the positive pole piece provided by the embodiment of the invention comprises the following steps:
s1, slurry mixing: according to the wet-process slurry mixing process shown in figure 1, lithium iron manganese phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Binder (PVDF (HSV 900)), conductive agent a (acetylene black), conductive agent B (carbon nanotube) at a mass ratio of 96.5:2:0.5:1, mixing the pulp. The method comprises the following specific steps: firstly, mixing PVDF and NMP, stirring and dispersing for the fourth time to prepare a glue solution, wherein the solid content of the glue solution is 7%, and then, mixing the carbon nano tube gel (conductive agent slurry containing carbon nano tubes, the solid content is5%) into the glue solution for fifth stirring and dispersion for 40min, adding acetylene black for continuous fifth stirring and dispersion for 40min, and finally adding lithium manganese iron phosphate and NMP for sixth stirring and dispersion, wherein the coating is not needed, the viscosity and solid content of the mixed slurry can not be required, and after the sixth stirring and dispersion is finished, sieving is carried out to obtain first slurry with the solid content of 50%, wherein the revolution speed of the fourth stirring and dispersion is 30rpm, the dispersion speed is 3000rpm, the stirring time is 150min, the revolution speed of the fifth stirring and dispersion is 40rpm, the dispersion speed is 3500rpm, the revolution speed of the sixth stirring and dispersion is 40rpm, the dispersion speed is 4000rpm, and the stirring time is 120min.
S2, a centrifugation process: and transferring the first slurry to a tubular centrifuge, wherein the rotation speed of the centrifuge is 8000rpm, the time is 60min, filtering the upper solvent to obtain a second slurry and a first solvent, and the first solvent can be continuously used for mixing the same material after being simply treated.
S3, a drying procedure: and placing the second slurry in a freeze drying box, setting the freeze drying temperature to be-60 ℃, freezing in vacuum, and freeze drying for 3 hours to obtain a first mixed material, wherein the absolute pressure of freeze drying is 5000 Pa.
S4, a fiberization treatment process: and (3) performing fiberization treatment on the first mixed material by adopting an ultra-high speed shearing mode to obtain a second mixed material, wherein the ultra-high speed shearing speed is 5000rpm, and the time is 70min.
S5, a film pressing process: and (5) rolling the second mixed material prepared in the step (S4) into a required thickness through two vertical compression rollers, and cutting the second mixed material into a required width through cutting equipment to obtain the electrode diaphragm, wherein the rolling temperature is 85 ℃.
S6, a tabletting process: and (4) pressing the electrode diaphragm prepared in the step (S5) to two sides of the carbon-coated aluminum foil through a hot-pressing roller to form an electrode diaphragm layer on the carbon-coated aluminum foil to obtain the positive electrode plate, wherein the temperature of the hot-pressing roller is 90 ℃, the thickness of the aluminum foil is 12 mu m, carbon-coated layers are respectively arranged on the two sides of the aluminum foil, the total thickness of the carbon-coated layers is 2 mu m, and the thickness of the electrode diaphragm layer is 110 mu m.
The present embodiment adds slurry mixing, centrifugation, and drying processes, which are related to each other and inseparable, and can significantly improve the peel strength of the positive electrode sheet, compared to the conventional dry electrode, and the applicant speculates that the processes may allow the binder to well bind the active material and the conductive agent, and the fibrosis is more uniform. In addition, the present embodiment can use the gel-like carbon nanotube conductive agent, and the solvent used for the slurry mixing is recyclable, which does not result in a significant increase in production cost.
Example 2
The preparation method of the positive pole piece provided by the embodiment of the invention comprises the following steps:
s1, slurry mixing: according to the dry slurry mixing process shown in fig. 2, lithium iron phosphate, a binder (PVDF (HSV 900)), a conductive agent a (acetylene black), and a conductive agent B (carbon nanotube) are mixed in a mass ratio of 96:2:1.2:0.8 mixing the slurry. The method comprises the following specific steps: firstly, adding lithium iron phosphate, a binder (PVDF (HSV 900)) and a conductive agent A (acetylene black) into a stirring tank according to a mass ratio for first stirring dispersion, then adding NMP for second stirring dispersion, and finally adding carbon nanotube gel (conductive agent slurry containing carbon nanotubes, wherein the solid content is 5%) for third stirring dispersion. And (3) screening after the third stirring and dispersing are finished to obtain first slurry with the solid content of 50%, wherein the revolution speed of the first stirring and dispersing is 40rpm, the dispersing speed is 0rpm, the stirring time is 40min, the revolution speed of the second stirring and dispersing is 30rpm, the dispersing speed is 3000rpm, the stirring time is 60min, the revolution speed of the third stirring and dispersing is 40rpm, the dispersing speed is 4000rpm, and the stirring time is 120min.
S2, a centrifugation process: and transferring the first slurry to a tubular centrifuge, wherein the rotation speed of the centrifuge is 10000rpm, the time is 40min, filtering the upper solvent to obtain a second slurry and a first solvent, and the first solvent can be continuously used for mixing the same type of materials after being simply treated.
S3, a drying procedure: and (3) placing the second slurry in a forced air drying oven, setting the drying temperature to be 120 ℃, and drying for 2 hours to obtain a first mixed material.
S4, a fiberization treatment process: and (3) performing fiberization treatment on the first mixed material by adopting an ultra-high-speed shearing mode to obtain a second mixed material, wherein the ultra-high-speed shearing speed is 8000rpm, and the time is 30min.
S5, a film pressing process: and rolling the second mixed material prepared in the step S4 into a required thickness through two vertical compression rollers, and cutting the second mixed material into a required width through cutting equipment to obtain the electrode diaphragm, wherein the rolling temperature is 85 ℃.
S6, a tabletting process: and (4) rolling the electrode diaphragm prepared in the step (S5) to two sides of the carbon-coated aluminum foil through a hot-pressing roller to form an electrode diaphragm layer on the carbon-coated aluminum foil to obtain the positive electrode plate, wherein the temperature of the hot-pressing roller is 90 ℃, the thickness of the aluminum foil is 12 microns, carbon-coated layers are respectively arranged on two sides of the aluminum foil, the total thickness of the carbon-coated layers is 2 microns (each side is 1 micron), and the thickness of the electrode diaphragm layer is 120 microns.
Example 3
The preparation method of the positive pole piece provided by the embodiment of the invention comprises the following steps:
s1, slurry mixing: according to the ball-milling slurry-mixing process shown in fig. 3, the ternary material (NCM 811), the binder (PVDF (5130)), the conductive agent a (carbon fiber), and the conductive agent B (carbon nanotube) were mixed in a mass ratio of 97:2:0.6: and 0.4, mixing the pulp. Firstly, adding a ternary material, a binder (PVDF, 5130) and a conductive agent A (carbon fiber) into a ball mill according to a mass ratio, carrying out ball milling, then transferring to a stirring tank, adding NMP, carrying out high-speed dispersion for 90min at a revolution speed of 40rpm and a dispersion speed of 4000rpm, finally adding carbon nanotube gel (conductive agent slurry containing carbon nanotubes, wherein the solid content is 5%), and carrying out high-speed stirring for 120min at a revolution speed of 30rpm and a dispersion speed of 4200 rpm. Because coating is not needed, the viscosity and solid content of the mixed slurry can be not required, and after high-speed stirring is finished, sieving is carried out to obtain first slurry with the solid content of 50%, wherein the ball milling rotating speed is 200r/min, and the ball-to-material ratio is 2: and 1, ball milling time is 40min.
S2, a centrifugation process: and transferring the first slurry to a tubular centrifuge, wherein the rotation speed of the centrifuge is 15000rpm, the time is 30min, filtering the upper solvent to obtain a second slurry and a first solvent, and the first solvent can be continuously used for mixing the same type of material after being simply treated.
S3, a drying procedure: and placing the second slurry in a freeze drying box, setting the freeze drying temperature to be-80 ℃, freezing in vacuum, and freeze drying for 2 hours to obtain a first mixed material, wherein the absolute pressure of freeze drying is 2000 Pa.
S4, a fiberization treatment process: and (3) performing fiberization treatment on the first mixed material by adopting an ultra-high-speed shearing mode to obtain a second mixed material, wherein the ultra-high-speed shearing speed is 6000rpm, and the time is 50min.
S5, a film pressing procedure: and (5) rolling the second mixed material prepared in the step (S4) into a required thickness through two vertical compression rollers, and cutting the second mixed material into a required width through cutting equipment to obtain the electrode diaphragm, wherein the rolling temperature is 90 ℃.
S6, a tabletting process: and (4) rolling the electrode diaphragm prepared in the step (S5) to two sides of the carbon-coated aluminum foil through a hot-pressing roller to form an electrode diaphragm layer on the carbon-coated aluminum foil to obtain the positive electrode plate, wherein the temperature of the hot-pressing roller is 100 ℃, the thickness of the aluminum foil is 12 microns, carbon-coated layers are respectively arranged on two sides of the aluminum foil, the total thickness of the carbon-coated layers is 2 microns, and the thickness of the electrode diaphragm layer is 130 microns.
Example 4
The preparation method of the positive pole piece provided by the embodiment of the invention is basically the same as that of the embodiment 1, and is different in that the raw material does not comprise a conductive agent B, and the preparation method specifically comprises the following steps:
s1, pulp mixing: according to the wet-process slurry mixing process shown in figure 1, lithium iron manganese phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Binder (PVDF (HSV 900)) and conductive agent a (acetylene black) in a mass ratio of 96.5:2: and 1.5, mixing the pulp. The concrete procedure is as in step S1 of example 1.
S2 to S6 are exactly the same as in example 1.
Comparative example 1
This comparative example is substantially the same as the raw material of example 1 except that the carbon nanotubes are gel-like to affect the subsequent compounding, and thus are replaced with the conductive agent a.
The preparation method of the positive pole piece provided by the comparative example is a traditional dry-method pole piece preparation process and has the advantages ofThe method comprises the following steps: firstly, lithium iron manganese phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Binder (PVDF (HSV 900)), conductive agent a (acetylene black), at a mass ratio of 96.5:2:1.5 mixing was performed in a stirring tank at a revolution speed of 40rpm, a dispersion speed of 0rpm and a stirring time of 40min, and then a fiberization process, a film pressing process and a sheet making process were performed with reference to steps S4 to S6 of example 1 to prepare a positive electrode sheet.
Comparative example 2
This comparative example is substantially the same as the raw material of comparative example 1, except that a dry electrode binder (polytetrafluoroethylene resin (PTFE)) having a good fiberization effect was added.
The preparation method of the positive pole piece provided by the comparative example is a traditional dry-process electrode piece preparation process, and specifically comprises the following steps: firstly, lithium iron manganese phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Binder (PVDF, HSV 900), conductive agent a (acetylene black) and dry electrode binder (PTFE), in a mass ratio of 95.5:2:0.5:2 in the stirring tank, the revolution speed is 40rpm, dispersion speed is 0rpm, stirring time is 40min, then refer to example 1 step S4-S6 to carry out its fiberization processing process, film pressing process and film preparation process preparation of positive pole piece.
Comparative example 3
This comparative example is substantially the same as the raw material of example 1, except that no binder (PVDF (HSV 900)) was used, only dry electrode binder (PTFE) was used, and no conductive agent B was included.
The preparation method of the positive pole piece provided by the comparative example is a traditional dry-process electrode piece preparation process, and specifically comprises the following steps: firstly, lithium manganese iron phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Conductive agent A (acetylene black) and PTFE, wherein the mass ratio of (A) to (B) is 95.5:0.5:4 in the stirring tank, the revolution speed is 40rpm, the dispersion speed is 0rpm, the stirring time is 40min, then refer to the example 1 step S4-S6 fibrosis processing process, film pressing process and the preparation of positive pole piece.
Comparative example 4
This comparative example is substantially the same as the raw material of example 1, except that the binder (PVDF (HSV 900)) was replaced with the dry electrode binder (PTFE) and the conductive agent B was replaced with the conductive agent a.
The preparation method of the positive pole piece provided by the comparative example is a traditional dry-process electrode piece preparation process, and specifically comprises the following steps: firstly, lithium manganese iron phosphate (LiMn) 0.6 Fe 0.4 PO 4 ) Conductive agent a (acetylene black) and PTFE, in a mass ratio of 96.5:1.5:2 in a stirring tank, the revolution speed was 40rpm, the dispersion speed was 0rpm, and the stirring time was 40min, and then the fiberization process, the film pressing process, and the sheet making process were performed with reference to steps S4 to S6 of example 1 to prepare a positive electrode sheet.
Performance testing
The peel strength of the positive electrode sheets manufactured in examples 1 to 4 and comparative examples 1 to 4 was measured, and the measurement results are shown in table 1.
The test method of the peel strength comprises the following steps: cutting the pole pieces prepared in the embodiment and the comparative example into test samples with the size of 90x120mm, adhering the cut pole pieces to the middle of a thin steel plate by using double-sided adhesive tape, wherein the end faces are flush, and the thin steel plate is wiped clean by using dust-free paper in advance without leaving stains and dust; and (3) reversely bending one end of the stripped sample by 180 degrees, fixing the sample on a tension probe, stripping by 180 degrees at a constant speed of 5cm/min, and testing the peel strength of the sample.
TABLE 1
The peel strength of the positive electrode sheets prepared in examples 1 to 4 was significantly higher than that of the positive electrode sheet prepared in the comparative example.
Known from comparative example 1, when the processes do not include the slurry mixing process, the centrifugation process and the drying process, the peel strength of the prepared positive electrode plate is remarkably reduced, the peel strength of the positive electrode plate prepared by the comparative example is low, and the PVDF is poor in fibrosis degree and cannot powerfully support the mixed material.
As can be seen from comparative example 2, although PTFE having a higher degree of fibrosis is added to improve the peel strength of the electrode sheet as compared with comparative example 1, it is still significantly lower than that of the electrode sheet prepared in example, and an increase in the binder content decreases the content of the positive electrode active material, and therefore, if the binder content is increased to achieve a higher peel strength, it inevitably results in a decrease in the energy density of the battery.
It can be seen from comparative example 4 that, when the binders are all PTFE with a better degree of fibrosis, the peel strength of the prepared pole piece is still significantly lower than that of the example, which shows that the peel strength of the positive pole piece is significantly improved by the positive pole piece provided by the example compared with that of the positive pole piece prepared by the dry method.
As can be seen from comparative example 3, compared with comparative example 4, although the content of PTFE is increased and the peel strength of the electrode sheet is improved, the peel strength is still significantly lower than that of the electrode sheet prepared in the examples, which indicates that the preparation method of the positive electrode sheet provided in this embodiment can enable the positive electrode sheet with high peel strength to be obtained even when the binder content is low and the positive active material content is high.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A preparation method of a positive pole piece is characterized by comprising the following steps:
a pulp mixing procedure: mixing and dispersing a positive electrode material, a binder, a conductive agent and an organic solvent to obtain first slurry;
centrifuging and drying: centrifuging the first slurry to obtain a second slurry and a first solvent, and drying the second slurry to obtain a first mixed material;
a fiberization treatment process: performing fiberization treatment on the first mixed material to obtain a second mixed material;
a tabletting process: and pressing the second mixed material onto a current collector after a film pressing process, or spraying the second mixed material onto the surface of the current collector to obtain the positive pole piece.
2. The method for preparing the positive electrode plate according to claim 1, wherein the step of pressing the second mixture onto the current collector after the step of film pressing comprises: and pressing the electrode diaphragm onto a current collector through a hot pressing roller after the second mixed material is made into the electrode diaphragm through the hot pressing roller equipment, wherein the temperature of the hot pressing roller is 50-150 ℃.
3. The preparation method of the positive pole piece according to claim 1, wherein in the step of slurry mixing procedure, the positive pole material, the binder, the conductive agent and the organic solvent are mixed and dispersed according to a dry slurry mixing process, a wet slurry mixing process or a ball milling slurry mixing process to obtain the first slurry;
and/or the solid content of the first slurry is 40-60%.
4. The method for preparing the positive pole piece according to claim 1, wherein the positive pole material comprises at least one of nickel-cobalt-manganese ternary material, lithium iron phosphate, lithium iron manganese phosphate and lithium cobaltate;
and/or the conductive agent comprises at least one of acetylene black, carbon nano tubes, graphene and carbon fibers;
and/or the organic solvent is N-methyl pyrrolidone;
and/or the binder is polyvinylidene fluoride;
and/or the current collector is a carbon-coated aluminum foil, the thickness of the aluminum foil is 10-15 mu m, carbon-coated layers are respectively arranged on two sides of the aluminum foil, and the total thickness of the carbon-coated layers is 2-4 mu m;
and/or the mass ratio of the positive electrode material to the conductive agent to the binder is (90-98): (0.5-6): (0.5-8), and the sum of the quantities of the positive electrode material, the conductive agent and the binder in the mass ratio is 100.
5. The method for preparing the positive electrode plate according to claim 1, wherein in the step of centrifuging and drying, the type of the centrifuge used for centrifuging comprises one of a three-leg centrifuge, a horizontal spiral centrifuge, a disk centrifuge and a tubular centrifuge;
and/or the rotating speed of a centrifugal machine used for centrifugation is 1000-50000rpm;
and/or the centrifugation time is 10-240min.
6. The method for manufacturing a positive electrode sheet according to claim 1, wherein the drying method in the step of centrifuging and drying includes one of drying under normal pressure, drying under reduced pressure and freeze-drying.
7. The preparation method of the positive pole piece according to claim 6, wherein the temperature of the atmospheric drying is 85-130 ℃;
or the pressure of the reduced pressure drying is-0.06 to-0.08 MPa, and the temperature is 50 to 90 ℃;
or the temperature of the freeze drying is-10 ℃ to-100 ℃, the absolute pressure is 0-10000Pa, and the time is 2-4h.
8. The method for preparing the positive electrode plate according to claim 1, wherein in the step of the fiberization treatment process, the fiberization mode is jet milling or ultra-high-speed shearing, wherein the jet milling has a jet pressure of 0.1Mpa-1Mpa and a time of 20-240min; the ultra-high speed shearing speed is 1000-8000rpm, and the time is 30-180min.
9. A positive pole piece is characterized in that the positive pole piece is prepared by the preparation method of the positive pole piece in any one of claims 1 to 8.
10. A lithium ion battery, characterized in that the lithium ion battery comprises the positive electrode sheet of claim 9.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101465018B1 (en) * | 2013-11-22 | 2014-11-25 | 주식회사 비츠로셀 | Method of manufacturing cathode of lithium primary battery using kneading mixing |
| CN110544761A (en) * | 2019-09-09 | 2019-12-06 | 广州鹏辉能源科技股份有限公司 | Preparation and evaluation methods of electrode plate, flexible porous positive plate and preparation method thereof, battery cell and lithium battery |
| CN111342053A (en) * | 2020-03-02 | 2020-06-26 | 太仓中科赛诺新能源科技有限公司 | Flexible integrated electrode plate and preparation method and application thereof |
| CN112701252A (en) * | 2019-10-23 | 2021-04-23 | 南京鼎腾石墨烯研究院有限公司 | Flexible battery pole piece, preparation method thereof and battery containing battery pole piece |
| WO2021184790A1 (en) * | 2020-03-20 | 2021-09-23 | Guangdong Haozhi Technology Co. Limited | Cathode and cathode slurry for secondary battery |
| CN113611825A (en) * | 2021-08-06 | 2021-11-05 | 中汽创智科技有限公司 | Preparation process of lithium battery electrode piece |
| CN113675362A (en) * | 2021-08-18 | 2021-11-19 | 蜂巢能源科技有限公司 | Method and system for preparing electrode slice by dry method and application |
| CN113964288A (en) * | 2021-10-26 | 2022-01-21 | 深圳市杰曼科技股份有限公司 | Preparation method of fiber membrane and pole piece |
| CN114203969A (en) * | 2021-11-29 | 2022-03-18 | 湖南立方新能源科技有限责任公司 | Preparation method of electrode plate, electrode plate and secondary battery |
| US20220209220A1 (en) * | 2020-12-30 | 2022-06-30 | Samsung Sdi Co., Ltd. | Electrode, lithium battery including the same, and method of manufacturing the electrode |
| CN114759158A (en) * | 2022-04-13 | 2022-07-15 | 合肥国轩高科动力能源有限公司 | Preparation method of dry-method electrode pole piece and secondary battery |
| CN114784220A (en) * | 2022-04-29 | 2022-07-22 | 三一技术装备有限公司 | Dry method electrode preparation method |
| CN115050949A (en) * | 2022-08-11 | 2022-09-13 | 楚能新能源股份有限公司 | Positive electrode slurry, preparation method thereof and lithium ion battery |
-
2022
- 2022-10-26 CN CN202211327311.XA patent/CN115548271B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101465018B1 (en) * | 2013-11-22 | 2014-11-25 | 주식회사 비츠로셀 | Method of manufacturing cathode of lithium primary battery using kneading mixing |
| CN110544761A (en) * | 2019-09-09 | 2019-12-06 | 广州鹏辉能源科技股份有限公司 | Preparation and evaluation methods of electrode plate, flexible porous positive plate and preparation method thereof, battery cell and lithium battery |
| CN112701252A (en) * | 2019-10-23 | 2021-04-23 | 南京鼎腾石墨烯研究院有限公司 | Flexible battery pole piece, preparation method thereof and battery containing battery pole piece |
| CN111342053A (en) * | 2020-03-02 | 2020-06-26 | 太仓中科赛诺新能源科技有限公司 | Flexible integrated electrode plate and preparation method and application thereof |
| WO2021184790A1 (en) * | 2020-03-20 | 2021-09-23 | Guangdong Haozhi Technology Co. Limited | Cathode and cathode slurry for secondary battery |
| US20220209220A1 (en) * | 2020-12-30 | 2022-06-30 | Samsung Sdi Co., Ltd. | Electrode, lithium battery including the same, and method of manufacturing the electrode |
| CN113611825A (en) * | 2021-08-06 | 2021-11-05 | 中汽创智科技有限公司 | Preparation process of lithium battery electrode piece |
| CN113675362A (en) * | 2021-08-18 | 2021-11-19 | 蜂巢能源科技有限公司 | Method and system for preparing electrode slice by dry method and application |
| CN113964288A (en) * | 2021-10-26 | 2022-01-21 | 深圳市杰曼科技股份有限公司 | Preparation method of fiber membrane and pole piece |
| CN114203969A (en) * | 2021-11-29 | 2022-03-18 | 湖南立方新能源科技有限责任公司 | Preparation method of electrode plate, electrode plate and secondary battery |
| CN114759158A (en) * | 2022-04-13 | 2022-07-15 | 合肥国轩高科动力能源有限公司 | Preparation method of dry-method electrode pole piece and secondary battery |
| CN114784220A (en) * | 2022-04-29 | 2022-07-22 | 三一技术装备有限公司 | Dry method electrode preparation method |
| CN115050949A (en) * | 2022-08-11 | 2022-09-13 | 楚能新能源股份有限公司 | Positive electrode slurry, preparation method thereof and lithium ion battery |
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