CN115498144A - Preparation method of 3DF electrode plate of lithium ion battery - Google Patents

Preparation method of 3DF electrode plate of lithium ion battery Download PDF

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CN115498144A
CN115498144A CN202211331062.1A CN202211331062A CN115498144A CN 115498144 A CN115498144 A CN 115498144A CN 202211331062 A CN202211331062 A CN 202211331062A CN 115498144 A CN115498144 A CN 115498144A
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positive
electrode material
material slurry
negative electrode
preparing
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邱霜
邓凌峰
卢新世
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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
    • 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
    • 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
    • H01M4/64—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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

A preparation method of a 3DF electrode pole piece of a lithium ion battery comprises the following steps: (1) preparing a 3DF positive and negative electrode current collecting matrix: preparing an Al-3DF positive electrode current collecting matrix; preparing a Cu-3DF negative electrode current collecting matrix; (2) preparing positive and negative electrode material slurry; (3) pre-coating the positive and negative electrode plates of 3 DF; and (4) preparing a 3DF positive and negative electrode pole piece. The invention adopts 3DF as the current collecting matrix of the positive and negative pole pieces of the lithium ion battery, the current collecting matrix has micropores, more electrode active substances can be filled, the unit volume capacity of the battery can be increased, the phenomenon of electrode active substance stripping is not easy to occur, the self-discharge phenomenon is reduced, and the consistency, the stability and the service life of the battery are greatly enhanced.

Description

Preparation method of 3DF electrode plate of lithium ion battery
Technical Field
The invention relates to a preparation method of a 3DF electrode plate of a lithium ion battery.
Background
The lithium ion battery gradually replaces nickel-cadmium batteries and nickel-hydrogen batteries with excellent performance, and is widely applied to video cameras, digital cameras, mobile phones, notebook computers, electric automobiles, space technology, national defense industry and other aspects. Although the lithium ion battery has superior performance, there are some problems in terms of the current collector substrate and the manufacturing process, such as the surface density of the electrode plate of the battery cannot be too large, the electrode plate is easy to fall powder, and many additives such as conductive agents and binders need to be added into the electrode active material, thereby causing poor large-current charging and discharging performance of the battery, poor battery consistency, poor cycle life, low capacity, large internal resistance, high cost of production raw materials, and the like. Most of the current methods only solve the problems from the aspect of manufacturing process, but the effect is not good, and no report is made about solving the problems by reforming the current collector substrate and combining the manufacturing process.
Therefore, the lithium ion battery is to optimize the performance of the lithium ion battery and improve the market competitiveness of the lithium ion battery. The invention provides a preparation method of a 3DF (Three Dimensional Foil) electrode plate of a lithium ion battery, aiming at some technical defects in the aspects of lithium ion battery current collector base materials and coating processes.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a lithium ion battery 3DF electrode plate, which can optimize the performance of a lithium ion battery and improve the market competitiveness of the lithium ion battery.
The invention adopts 3DF as the current collecting matrix of the positive and negative pole pieces of the lithium ion battery, the current collecting matrix has micropores, more electrode active substances can be filled, the unit volume capacity of the battery can be increased, the phenomenon of electrode active substance stripping is not easy to occur, the self-discharge phenomenon is reduced, and the consistency, the stability and the service life of the battery are greatly enhanced.
The technical scheme adopted by the invention for solving the technical problem is as follows: a preparation method of a 3DF electrode pole piece of a lithium ion battery comprises the following steps:
(1) Preparing a 3DF positive and negative electrode current collecting matrix:
preparation of Al-3DF (Three-Dimensional Aluminum Foil) positive electrode current collecting substrate: the anode current collector selects a single-sided light or double-sided light aluminum foil with the diameter of 10-16 mu m, the surface of the aluminum foil is cleaned and de-oiled and removed by an ultrasonic flow field, and then the aluminum foil is subjected to pore-forming by laser beams to prepare an Al-3DF anode current-collecting substrate with uniform pore size distribution and the pore size of 40-80 mu m;
Preparation of Cu-3DF (Three-Dimensional Copper Foil) negative current collecting substrate: selecting a copper foil with single-sided hair, double-sided hair or double-sided coarsened 8-13 mu m as a negative current collector, cleaning the surface of the aluminum foil through an ultrasonic flow field to remove oil and impurities, and then forming holes on the aluminum foil through laser beams to prepare a Cu-3DF negative current collecting substrate with uniform pore size distribution and the pore size of 30-70 mu m;
(2) Preparing anode and cathode electrode material slurry:
preparing anode electrode material slurry: the positive electrode material slurry comprises a positive electrode active substance, a conductive agent, a binder and a solvent, and the positive electrode active substance, the conductive agent, the binder and the solvent are uniformly mixed to prepare positive electrode material slurry;
preparing cathode electrode material slurry: the negative electrode material slurry comprises a negative electrode active material, a conductive agent, a binder and a solvent, and the negative electrode active material, the conductive agent and the binder are uniformly mixed to prepare negative electrode material slurry;
(3) Pre-coating the 3DF positive and negative electrode plates:
adding the prepared positive or negative electrode material slurry into a slurry tank of a coating machine, adjusting the drying temperature (90-130 ℃) and the gap of a scraper opening of the coating machine to ensure that micropores of Al-3DF or Cu-3DF are filled with the positive or negative electrode material slurry and the surface of the Al-3DF or Cu-3DF is also coated with a layer (10-25 mu m) of the positive or negative electrode material slurry, drying and compacting by a pole piece film binding machine to ensure that the compacted positive or negative electrode material is filled in the pores in the Al-3DF or Cu-3DF and a layer of compacted and smooth positive or negative electrode material layer is formed on the surface of the Al-3DF or Cu-3DF so as to finish the pre-coating of the positive or negative electrode material layer of the 3 DF;
(4) Preparing a 3DF positive and negative electrode plate:
adding the prepared positive or negative electrode material slurry (same as the electrode active material slurry in the step (3)) into a slurry tank of a coating machine, adjusting the drying temperature (90-130 ℃) and the gap of a scraper opening of the coating machine, coating a layer (the thickness required by the design) of the positive or negative electrode material slurry on the two surfaces of the positive or negative electrode plate of the 3DF coated in the first stage, drying, combining, and compacting by a plate binding machine to prepare the required positive or negative electrode plate of the 3 DF.
Further, in the step (2), preparing positive electrode material slurry: the positive active material is one or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganese oxide and graphene-based composite materials thereof, the conductive agent is one or more of carbon nanofibers, carbon nanotubes, graphene, nano conductive metal wires, acetylene black, conductive carbon black, graphite black powder, conductive polymers and the like, the binder is one of polytetrafluoroethylene and polyvinylidene fluoride, and the solvent is N-methylpyrrolidone.
Further, in the step (2), preparing positive electrode material slurry: uniformly mixing the positive active material, the conductive agent, the binder and the solvent according to the mass ratio of (0.94-0.85) to (0.03-0.08) to (0.03-0.07) to (1.8-2.0).
Further, in the step (2), preparing anode electrode material slurry: the negative active material is one or more of artificial stone black, natural stone black, modified natural stone black, mesocarbon microbeads, lithium titanate and graphene-coated modified composite materials, the conductive agent is one or more of carbon nanofibers, carbon nanotubes, graphene, nano conductive metal wires, acetylene black, conductive carbon black, stone black powder and the like, the binder is one of PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), SBR (styrene butadiene latex), CMC (carboxymethyl cellulose), MC (methyl cellulose) and the like, and the solvent is one of N-methyl pyrrolidone, water and the like.
Further, in the step (2), preparing anode electrode material slurry: uniformly mixing a negative electrode active material, a conductive agent and a binder according to the mass ratio of (0.95-0.92) to (0.025-0.35) to (0.025-0.4) to (1.7-2.1).
The current collecting capacity of the 3DF current collecting substrate obtained by the invention is better; the 3DF current collecting matrix is provided with micropores, more electrode active substances can be filled, the unit volume capacity of the battery can be increased, the phenomenon of stripping of the electrode active substances is not easy to occur, the self-discharge phenomenon is reduced, and the service life is long. Therefore, the lithium ion power battery thoroughly solves the problems of rapid charge and discharge and battery heating, can realize the charging speed of fully charging the battery within 6 minutes, greatly enhances the consistency and stability of the battery, prolongs the service life of the battery, and reduces the production cost by about 30 percent.
The invention is used for the lithium ion battery, and has the advantages that:
(1) The cost is reduced, the thickness of the pole piece can be 2 times thicker than that of the pole piece adopting the Al-3DF or Cu-3DF afflux matrix mode and the battery performance is not influenced, the production process is simplified (the thin electrode piece is manufactured, the process is complex), the production efficiency is improved, the using area of the base plate is reduced (the base plate is reduced by 50%), the using area of the isolating membrane is reduced (the length of the pole piece is reduced by half, and the using area of the isolating membrane is correspondingly reduced by half), the afflux matrix has micropores, better conductivity is realized, the phenomenon of stripping of electrode active substances is not easy to occur, the using amount of a conductive agent and a bonding agent in slurry can be reduced, the utilization rate of an electrode active material is increased, the internal resistance of the battery is reduced, and the cost of the production raw materials of the battery is relatively reduced. Therefore, the direct material can be reduced by about 10 percent, and the production cost can be reduced by 20 percent;
(2) The reliability (including improvement of safety) is high, and the defect rate of production is reduced, so that the reliability (safety) is improved, namely, the phenomenon that the polar plate deviates from the center when being wound can be reduced, the distance between the polar lug and the end part of the counter electrode is increased, and the short circuit of the battery is reduced;
(3) The current collecting matrix has micropores, can be filled with more electrode active substances, can increase the unit volume capacity of the battery, reduces the powder falling phenomenon of the battery in the coating and tabletting processes and in the circulating process, and prolongs the cycle life of the battery.
Drawings
FIG. 1 is a schematic structural view of an Al-3DF current collecting substrate used in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a Cu-3DF current collecting substrate used in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first stage coating according to the present invention;
FIG. 4 is a schematic structural diagram of a second stage coating according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1
A preparation method of a 3DF positive pole piece of a lithium ion battery comprises the following steps:
(1) Preparing an Al-3DF positive electrode current collecting matrix: selecting a 13-micrometer double-sided smooth aluminum foil as a positive current collector, cleaning the surface of the aluminum foil through an ultrasonic flow field to remove oil and impurities, and then forming holes in the aluminum foil through laser beams to prepare an Al-3DF positive current collecting substrate with uniform pore size distribution and 50 micrometers of pore size, as shown in figure 1;
(2) Preparing anode material slurry: the positive electrode material slurry comprises a positive electrode active substance, a conductive agent, a binder and a solvent, wherein the positive electrode active substance is a graphene/lithium iron phosphate composite material, the conductive agent is conductive carbon black, the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone; uniformly mixing the graphene/lithium iron phosphate composite material, conductive carbon black, polyvinylidene fluoride and N-methyl pyrrolidone according to a mass ratio of 0.85;
(3) Pre-coating an Al-3DF positive pole piece: adding the prepared anode material slurry into a slurry tank of a coating machine, adjusting the drying temperature (120 ℃) and the scraper opening gap of the coating machine, so that micropores of Al-3DF are filled with the anode material slurry, coating a layer (15 mu m) of anode material slurry on the surface of Al-3DF, drying, compacting by a pole piece film binding machine, so that the pores in the Al-3DF are filled with the compacted anode material, and forming a layer of compacted, flat and smooth anode material layer on the surface of the Al-3DF, thereby completing the pre-coating of the 3DF anode pole piece, as shown in FIG. 3;
(4) Preparing an Al-3DF positive pole piece: adding the prepared anode material slurry (the same as the electrode active material slurry in the step (3)) into a slurry tank of a coating machine, adjusting the drying temperature (120 ℃) and the gap of a scraper opening of the coating machine, coating a layer of anode material slurry (with the thickness required by design) on the front surface and the back surface of the Al-3DF anode plate coated in the first stage, drying, and compacting by a plate rolling machine to prepare the required Al-3DF anode plate, wherein the thickness of the anode material slurry is the thickness required by the design, and the figure 4 shows that the anode plate is formed by coating the anode plate on the front surface and the back surface of the Al-3DF anode plate.
Taking a graphene/lithium iron phosphate composite material as a positive electrode active material, conductive carbon black as a conductive agent, polyvinylidene fluoride (PVDF) as a binder and N-methylpyrrolidone as a solvent, adding 1.7g of the graphene/lithium iron phosphate composite material, 0.16g of the conductive carbon black and 0.14g of polyvinylidene fluoride into 3.7g of the N-methylpyrrolidone, uniformly stirring, preparing a graphene/lithium iron phosphate positive electrode sheet by the method provided in example 1, drying in a vacuum drying oven at 80 ℃ for 8 hours in vacuum, taking a metal lithium sheet as a negative electrode, taking a polypropylene microporous membrane (Celgard 2400) as a diaphragm and 1mol/L LiPF 6 And (EC: DMC = 1: 1, volume ratio) as electrolyte, and assembling the electrolyte into a button cell in an argon-filled glove box. The battery program-controlled tester is used for carrying out charge-discharge cycle test, the voltage range is 2.0-4.0V, the lithium iron phosphate is charged and discharged at 0.2C, the discharge specific capacity of the obtained lithium iron phosphate reaches 170.8mAh/g and is close to the theoretical discharge specific capacity, the lithium iron phosphate is charged and discharged at 1C, and after 300 cycles, the capacity is only attenuated by 0.5%. The invention adopts a novel 3DF current collecting matrix, and the specific discharge capacity and the cycle service life of the electrode active substance are improved.
Example 2
A preparation method of a Cu-3DF negative pole piece of a lithium ion battery comprises the following steps:
(1) Preparing a Cu-3DF negative current collecting matrix: selecting a double-sided rough copper foil with the diameter of 10 mu m as a negative current collector, cleaning the surface of an aluminum foil through an ultrasonic flow field to remove oil and impurities, and then forming holes on the aluminum foil through laser beams to prepare a Cu-3DF negative current collecting substrate with the uniform pore size distribution and the pore size of 40 mu m, as shown in figure 2;
(2) Preparing anode material slurry: the positive electrode material slurry comprises a negative electrode active substance, a conductive agent, a binder and a solvent, wherein the negative electrode active substance is graphene modified natural stone black, the conductive agent is conductive carbon black, the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone; uniformly mixing the graphene modified natural stone black, the conductive carbon black, the polyvinylidene fluoride and the N-methyl pyrrolidone according to the mass ratio of 0.94;
(3) Pre-coating a Cu-3DF negative pole piece:
adding the prepared cathode material slurry into a slurry tank of a coating machine, adjusting the drying temperature (90-130 ℃) and the scraper opening gap of the coating machine, filling the cathode material slurry into micropores of Cu-3DF, coating a layer (15 mu m) of cathode material slurry on the surface of the Cu-3DF, drying, compacting by a pole piece film binding machine, filling the compacted cathode material into pores in the Cu-3DF, and forming a compacted, flat and smooth cathode material layer on the surface of Al-3DF, thereby completing the pre-coating of the Cu-3DF cathode pole piece;
(4) Preparing a Cu-3DF negative pole piece:
adding the prepared cathode material slurry (which is the same as the electrode active material slurry in the step (3)) into a slurry tank of a coating machine, adjusting the drying temperature (110 ℃) and the blade opening gap of the coating machine, coating a layer of cathode material slurry (with the thickness required by design) on the front surface and the back surface of the Cu-3DF cathode plate coated in the first stage, drying, and compacting by a plate bundling machine to prepare the required Cu-3DF cathode plate.
Taking graphene modified natural stone black as a negative electrode active material, conductive carbon black as a conductive agent, polyvinylidene fluoride (PVDF) as a binder and N-methylpyrrolidone as a solvent, adding 1.88g of graphene modified natural stone black, 0.07g of conductive carbon black and 0.05g of polyvinylidene fluoride into 3.4g of N-methylpyrrolidone, uniformly stirring, preparing a graphene modified natural stone black negative electrode sheet by the method provided by example 2, performing vacuum drying in a vacuum drying oven at 80 ℃ for 8 hours, taking a metal lithium sheet as a counter electrode, taking a polypropylene microporous membrane (Celgard 2400) as a diaphragm and 1mol/L LiPF 6 And (EC: DMC = 1: 1, volume ratio) as electrolyte, and assembling the electrolyte into a button cell in an argon-filled glove box. And carrying out charge-discharge cycle test by using a battery program-controlled tester, wherein the voltage range is 0.001-3.And 0V, charging and discharging at 0.2C, wherein the reversible specific capacity of the obtained graphene modified natural stone black reaches 420.8mAh/g, and charging and discharging at 1C, and after 500 cycles, the capacity is only attenuated by 0.7%. The invention adopts a novel 3DF current collecting matrix, and the reversible specific capacity and the cycle service life of the electrode active substance are improved.

Claims (5)

1. A preparation method of a 3DF electrode pole piece of a lithium ion battery is characterized by comprising the following steps:
(1) Preparing a 3DF positive and negative electrode current collecting matrix:
preparing an Al-3DF positive current collecting matrix: selecting a single-sided light or double-sided light aluminum foil with the diameter of 10-16 mu m as a positive current collector, cleaning the surface of the aluminum foil through an ultrasonic flow field to remove oil and impurities, and then forming holes on the aluminum foil through laser beams to prepare an Al-3DF positive current collecting substrate with uniform pore size distribution and the pore size of 40-80 mu m;
preparing a Cu-3DF negative current collecting matrix: selecting a copper foil with single-sided hair, double-sided hair or double-sided coarsened 8-13 mu m as a negative current collector, cleaning the surface of the aluminum foil through an ultrasonic flow field to remove oil and impurities, and then forming holes on the aluminum foil through laser beams to prepare a Cu-3DF negative current collecting substrate with uniform pore size distribution and the pore size of 30-70 mu m;
(2) Preparing anode and cathode electrode material slurry:
preparing anode electrode material slurry: the positive electrode material slurry comprises a positive electrode active substance, a conductive agent, a binder and a solvent, and the positive electrode active substance, the conductive agent, the binder and the solvent are uniformly mixed to prepare positive electrode material slurry;
preparing cathode electrode material slurry: the negative electrode material slurry comprises a negative electrode active substance, a conductive agent, a binder and a solvent, and the negative electrode active substance, the conductive agent, the binder and the solvent are uniformly mixed to prepare negative electrode material slurry;
(3) Pre-coating the 3DF positive and negative electrode plates:
adding the prepared anode electrode material slurry or cathode electrode material slurry into a slurry tank of a coating machine, adjusting the drying temperature and the scraper opening gap of the coating machine, so that micropores of Al-3DF or Cu-3DF are filled with the anode electrode material slurry or cathode electrode material slurry, a layer of anode electrode material slurry or cathode electrode material slurry is also coated on the surface of Al-3DF or Cu-3DF, drying and compacting by a pole piece binding machine, so that the compacted anode electrode material or cathode electrode material is filled in the pores in the Al-3DF or Cu-3DF, and a layer of compacted and smooth anode electrode material layer or cathode electrode material layer is formed on the surface of the Al-3DF or Cu-3DF, thereby completing the pre-coating of the 3 positive and negative pole pieces DF;
(4) Preparing a 3DF positive and negative electrode plate:
adding the prepared positive electrode material slurry or negative electrode material slurry into a slurry tank of a coating machine, adjusting the drying temperature and the scraper gap of the coating machine, coating a layer of positive electrode material slurry or negative electrode material slurry on two surfaces of the 3DF positive and negative electrode plates coated in the first stage, drying, and compacting by a plate rolling machine to obtain the required 3DF positive and negative electrode plates.
2. The preparation method of the lithium ion battery 3DF electrode plate according to claim 1, wherein in the step (2), the positive electrode material slurry is prepared by: the positive active material is one or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganese and graphene-based composite materials thereof; the conductive agent is one or more of carbon nanofibers, carbon nanotubes, graphene, nano conductive metal wires, acetylene black, conductive carbon black, graphite powder and conductive polymers; the binder is one of polytetrafluoroethylene and polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone.
3. The preparation method of the lithium ion battery 3DF electrode plate according to claim 1 or 2, characterized in that in the step (2), the positive electrode material slurry is prepared by: uniformly mixing a positive electrode active material, a conductive agent, a binder and a solvent according to the mass ratio of 0.94-0.85.
4. The preparation method of the lithium ion battery 3DF electrode plate according to claim 1 or 2, characterized in that in the step (2), the negative electrode material slurry is prepared by: the negative electrode active substance is one or more of artificial stone black, natural stone black, modified natural stone black, mesocarbon microbeads, lithium titanate and graphene-coated modified composite materials, the conductive agent is one or more of carbon nanofibers, carbon nanotubes, graphene, nano conductive metal wires, acetylene black, conductive carbon black and stone black powder, the binder is one of polytetrafluoroethylene, polyvinylidene fluoride, styrene butadiene latex, carboxymethyl cellulose and methyl cellulose, and the solvent is one of N-methyl pyrrolidone and water.
5. The preparation method of the lithium ion battery 3DF electrode plate according to claim 1 or 2, characterized in that in the step (2), the negative electrode material slurry is prepared by: uniformly mixing a negative electrode active material, a conductive agent and a binder according to a mass ratio of 0.95-0.92.
CN202211331062.1A 2022-10-28 2022-10-28 Preparation method of 3DF electrode plate of lithium ion battery Pending CN115498144A (en)

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