WO2023024765A1 - Plaque d'électrode positive et procédé de préparation associé, ainsi que batterie au lithium-ion - Google Patents

Plaque d'électrode positive et procédé de préparation associé, ainsi que batterie au lithium-ion Download PDF

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WO2023024765A1
WO2023024765A1 PCT/CN2022/106540 CN2022106540W WO2023024765A1 WO 2023024765 A1 WO2023024765 A1 WO 2023024765A1 CN 2022106540 W CN2022106540 W CN 2022106540W WO 2023024765 A1 WO2023024765 A1 WO 2023024765A1
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positive electrode
conductive agent
binder
slurry
nickel
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Chinese (zh)
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江卫军
杨红新
许鑫培
陈思贤
郑晓醒
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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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
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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

Definitions

  • the present application relates to the technical field of lithium-ion batteries, in particular, to a positive pole piece, a preparation method thereof, and a lithium-ion battery.
  • the energy density of lithium-ion power batteries is also increasing.
  • the main methods are to increase the capacity of the material, increase the voltage and increase the density.
  • most of the researches focus on increasing the capacity and voltage, but less attention is paid to improving the density of materials, especially the compaction density of the positive electrode sheet.
  • the compacted density of lithium cobalt oxide positive pole piece is the highest, which can reach 4.2g/cm 3 , the theoretical maximum density of the crystal is 5.2g/cm 3 , and the space utilization rate of the pole piece is about 80%.
  • the compacted density of the nickel-cobalt-manganese ternary positive electrode material is usually up to 3.5g/cm 3 , the theoretical maximum density of the crystal is 4.8g/cm 3 , and the space utilization rate of the pole piece is about 73%. Therefore, there is still a lot of room for improvement in the compaction density of nickel-cobalt-manganese ternary cathode materials.
  • the current positive electrode manufacturing process in lithium-ion batteries is usually to first prepare positive electrode active micro-particles, conductive agent and binder in NMP (N-methylpyrrolidone) solvent to form a slurry with a certain viscosity. Then the slurry is coated on the aluminum foil, and rolled and cut into pieces to obtain the required positive electrode sheet.
  • NMP N-methylpyrrolidone
  • this method is a common technology in the industry, the NMP organic solvent of this technology has led to an increase in cost, and the delamination of the binder in the NMP solvent drying process affects the compaction density of the pole piece, and the conductive agent, bonding agent, etc.
  • the uneven distribution of various materials such as additives among the particles also affects the compaction density of the pole piece. Therefore, there is still room for improvement in this technology.
  • Patent CN103093969B reports a method for making pole pieces without NMP solvent.
  • the method is prepared by mixing the conductive agent, the binding agent, the positive electrode active micron particles and the electrolyte salt powder. Since various powder materials are mixed together, the uniform distribution of various powder materials cannot be guaranteed, and the space of the pole piece cannot be fully and effectively utilized.
  • the main purpose of the present application is to provide a positive pole piece and its preparation method, and a lithium-ion battery, so as to solve the problem in the prior art that the positive pole piece has a low compaction density, thereby affecting the energy density of the battery.
  • a method for preparing a positive electrode sheet includes the following steps: step S1, using a fluidized bed process to first coat a conductive agent on the surface of the nickel-cobalt-manganese ternary positive electrode material Form the first coating layer, then coat the binder to form the second coating layer, and then form the active powder; step S2, apply the active powder on the surface of the current collector by dry coating, and then roll Press to obtain the positive electrode sheet.
  • step S1 includes: step S11, putting the nickel-cobalt-manganese ternary positive electrode material into the fluidized bed cavity, and passing the first carrier gas into it so that the nickel-cobalt-manganese ternary positive electrode material is in a fluidized state; Step S12, atomize and spray the slurry of the conductive agent into the fluidized bed cavity, make it contact with the fluidized nickel-cobalt-manganese ternary positive electrode material, and then coat the conductive agent on the nickel-cobalt-manganese ternary positive electrode material Form the first coating layer on the surface to obtain the primary coating powder; step S13, maintain the primary coating powder to continue to be in a fluidized state, and then atomize and spray the solution of the binder into the fluidized bed cavity to make it Contact with the primary coating powder in a fluidized state, and then make the binder coat the surface of the primary coating powder to form a second coating layer to obtain an active powder.
  • step S11 the flow rate of the first carrier gas is 0.15-0.23 m 3 /h, and the temperature is 80-150°C.
  • the solvent of the slurry of the conductive agent is water and/or NMP, and the viscosity of the slurry of the conductive agent is lower than 2000mP ⁇ s, preferably 500-1500mP ⁇ s; preferably, the second carrier gas
  • the slurry of the conductive agent is atomized and sprayed into the cavity of the fluidized bed, more preferably the atomization speed of the slurry of the conductive agent is 1-2 g/min.
  • the solvent of the binder slurry is NMP, and the viscosity of the binder slurry is 1000-2000 mP ⁇ s; preferably, the binder slurry is atomized by the third carrier gas Spraying into the cavity of the fluidized bed, more preferably, the atomization speed of the binder slurry is 0.5-1.5 g/min; preferably, the first carrier gas, the second carrier gas and the third carrier gas are all nitrogen.
  • step S2 includes: coating the active powder on the surface of the current collector by means of electrostatic spraying, and then rolling to obtain the positive electrode sheet; preferably, electrostatic spraying is performed using an electrostatic spraying machine, and the voltage of the electrostatic spraying machine is 10-100KV; preferably, after electrostatic spraying, the temperature of the pressure roller during the rolling process is 70-150°C, and the pressure is 5-50MPa; or, the active powder is subjected to the first rolling to form the front pole piece, Then carry out the second roll pressing of the front electrode sheet and the current collector to obtain the positive electrode sheet; preferably, before the first rolling step of the active powder, 1 to 5% by weight of NMP is added to the active powder , during the first rolling process, the temperature of the pressing roller is 80-130° C.; preferably, during the second rolling process, the temperature of the pressing roller is 70-150° C., and the pressure is 5-100 MPa.
  • electrostatic spraying is performed using an electrostatic spraying machine, and the voltage of the electrostatic spraying machine
  • the nickel content in the nickel-cobalt-manganese ternary positive electrode material is ⁇ 60 wt%, preferably, the particle size D10 of the nickel-cobalt-manganese ternary positive electrode material is 1-5 microns, D50 is 2-15 microns, and D90 is 5-30 microns ; More preferably, the specific surface area of the nickel-cobalt-manganese ternary positive electrode material is 0.1-1.5m 2 /g.
  • the conductive agent is one or more of carbon nanotubes, carbon black and graphene;
  • the binder is one or more of PVDF, PTFE, PEDOT and PAN; the aluminum foil or copper foil of the current collector;
  • the weight of the conductive agent is 0.1-1% of the weight of the nickel-cobalt-manganese ternary positive electrode material, and the weight of the binder is 0.5-5% of the weight of the nickel-cobalt-manganese ternary positive electrode material.
  • a positive electrode sheet is also provided, which is prepared by the above preparation method.
  • a lithium ion battery including a positive pole piece, which is the above-mentioned positive pole piece, or a positive pole piece prepared by the above-mentioned preparation method.
  • the conductive agent and the binder are sequentially coated on the surface of the ternary positive electrode material through a fluidized bed process in advance to form the first coating layer (conductive agent layer) coated on the surface of the ternary positive electrode material and the first coating layer on the surface of the ternary positive electrode material
  • the second coating layer (binder layer) on the surface of the coating layer and then directly dry-coat the positive electrode active material micro-particles on the current collector layer, and then roll pressing to obtain a highly compacted positive electrode sheet .
  • the positive electrode sheet obtained by this method greatly reduces the distribution volume of the conductive agent and the binder in the electrode sheet, and the ternary positive electrode material particles are closely combined, and the space utilization rate is high, so that the positive electrode sheet Compared with the traditional slurry coating method, the compaction density is significantly improved, and can even reach 4.0g/cm 3 .
  • Fig. 1 shows a scanning electron micrograph of the active material layer in the positive electrode sheet prepared according to Example 1 of the present application.
  • FIG. 2 shows a scanning electron micrograph of the active material layer in the positive electrode sheet prepared in Comparative Example 1.
  • the application provides a method for preparing the positive electrode sheet, which includes the following steps: step S1, using a fluidized bed process to first coat the conductive agent on the surface of the nickel-cobalt-manganese ternary positive electrode material Form the first coating layer, then coat the binder to form the second coating layer, and then form the active powder; step S2, apply the active powder on the surface of the current collector by dry coating, and then roll Press to obtain the positive electrode sheet.
  • the conductive agent and the binder are sequentially coated on the surface of the ternary positive electrode material through a fluidized bed process in advance to form the first coating layer (conductive agent layer) coated on the surface of the ternary positive electrode material and the first coating layer on the surface of the ternary positive electrode material
  • the second coating layer (binder layer) on the surface of the coating layer and then directly dry-coat the positive electrode active material micro-particles on the current collector layer, and then roll pressing to obtain a highly compacted positive electrode sheet .
  • the positive electrode sheet obtained by this method greatly reduces the distribution volume of the conductive agent and the binder in the electrode sheet, and the ternary positive electrode material particles are closely combined, and the space utilization rate is high, so that the positive electrode sheet Compared with the traditional slurry coating method, the compaction density is significantly improved, and can even reach 4.0g/cm 3 .
  • the above step S1 includes: step S11, putting the nickel-cobalt-manganese ternary positive electrode material into the fluidized bed cavity, and passing the first carrier gas into it to make the nickel-cobalt-manganese ternary
  • the positive electrode material is in a fluidized state
  • step S12 atomize and spray the slurry of the conductive agent into the fluidized bed cavity, make it contact with the fluidized nickel-cobalt-manganese ternary positive electrode material, and then make the conductive agent coated on the
  • a first coating layer is formed on the surface of the nickel-cobalt-manganese ternary positive electrode material to obtain a primary coating powder
  • step S13 the primary coating powder is kept in a fluidized state, and then atomized and sprayed into the fluidized bed cavity
  • the binder solution is brought into contact with the fluidized primary coating powder, and then the binder is coated on the surface of the primary coating powder to form a second coating layer to obtain an active powder.
  • the nickel-cobalt-manganese ternary cathode material particles can be thrown in the cavity at high speed by using high-temperature compressed nitrogen, and then the slurry of the conductive agent is atomized and sprayed into contact with the fluidized powder.
  • the solvent in the slurry can be volatilized quickly, while the conductive agent remains on the surface of the positive electrode material particles to form a coating.
  • keep the primary coating powder in a fluidized state then atomize and spray the slurry of the binder, and contact with the fluidized primary coating powder.
  • the solvent in the slurry evaporates quickly , the binder is further coated on the surface of the primary coating powder, and finally the active powder is obtained.
  • the conductive agent and the binder form a good coating on the surface of the positive electrode material particles, which is conducive to further improving the space utilization of the particles on the surface of the current collector, thereby improving the compaction of the positive electrode sheet. Density has a better boost.
  • step S11 the flow rate of the first carrier gas 0.15-0.23m 3 /h, and the temperature is 80-150°C.
  • the solvent of the slurry of the conductive agent is water and/or NMP, and the viscosity of the slurry of the conductive agent is lower than 2000mP ⁇ s, preferably 500-1500mP ⁇ s (for example, carbon nanotubes are used as the conductive agent , and its concentration is 0.2-0.6%.
  • the viscosity within the above range, on the one hand, the atomization effect is better, and on the other hand, it also avoids the problem of too slow coating speed caused by too thin slurry.
  • the slurry of the conductive agent is atomized and sprayed into the cavity of the fluidized bed through the second carrier gas, more preferably, the atomization speed of the slurry of the conductive agent is 1 ⁇ 2 g/min.
  • the solvent of the binder slurry is preferably NMP, and the viscosity of the binder slurry is 1000-2000mP ⁇ s; preferably, by
  • the third carrier gas atomizes the slurry of the binder into the fluidized bed cavity, more preferably the atomization speed of the slurry of the binder is 0.5-1.5g/min; preferably, the first carrier gas, Both the second carrier gas and the third carrier gas are nitrogen.
  • step S2 includes: coating the active powder on the surface of the current collector by electrostatic spraying, and then rolling to obtain the positive electrode sheet; preferably, electrostatic spraying is performed using an electrostatic spraying machine, The voltage of the electrostatic spraying machine is 10-100KV.
  • electrostatic spraying the active powder can be dry-coated on the surface of the current collector layer under the action of an electric field.
  • the electrostatic force of the powder during the electrostatic spraying process is relatively uniform, and the distribution of the powder layer coated on the surface of the current collector is relatively uniform and dense, which is conducive to further improving the compaction of the positive electrode sheet. density.
  • the temperature of the pressing roller is 70-150° C. and the pressure is 5-50 MPa during the rolling process. Controlling the temperature and pressure conditions of the pressing roller within the above range is conducive to the mutual adhesion of the binders and the formation of a denser active material layer on the surface of the current collector. During actual operation, it is preferable that the rolling includes 3 to 5 times of rolling.
  • dry coating can also be carried out in the following manner: the active powder is first rolled to form a front electrode sheet, and then the front electrode sheet and the current collector are subjected to a second roll press to obtain a positive electrode pole piece.
  • a second roll press to obtain a positive electrode pole piece.
  • 1-5% by weight of NMP is added to the active powder, and during the first rolling, the temperature of the pressing roller is 80-130°C. Adding a small amount of solvent NMP will neither damage the coating layer on the surface of the positive electrode material, but also facilitate the formation of an overall pre-pressed layer during the first rolling process, and then place it directly on the current collector layer for the second roll
  • a relatively stable positive electrode sheet with high compaction density can be formed.
  • the temperature of the pressing roll is 70-150° C., and the pressure is 5-100 MPa.
  • the second rolling includes 3 to 5 times of rolling.
  • the nickel content in the nickel-cobalt-manganese ternary positive electrode material is ⁇ 60wt%.
  • the specific nickel-cobalt-manganese ternary positive electrode material can be a common type in this field, such as LiNi 0.83 Co 0.11 Mn 0.06 O 2 , LiNi 0.6 Co 0.1 Mn 0.3 O 2 , LiNi 0.6 Co 0.2 Mn 0.2 O 2 , etc.
  • the particle size D10 of the nickel-cobalt-manganese ternary positive electrode material is 1-5 microns, the D50 is 2-15 microns, and the D90 is 5-30 microns.
  • the nickel-cobalt-manganese ternary cathode material with the above particle size is selected, the particle size is more uniform and suitable, the coating effect of the subsequent conductive agent and binder is also more uniform, and the space utilization rate on the surface of the current collector is higher. More preferably, the specific surface area of the nickel-cobalt-manganese ternary positive electrode material is 0.1 ⁇ 1.5 m 2 /g.
  • the moisture content of the nickel-cobalt-manganese ternary positive electrode material can be dried to below 0.1% before coating. More preferably, the pH value of the positive electrode material is 10.5-12.5.
  • the thickness of the pole piece is 50-200 microns, and after rolling, the thickness of the final positive pole piece is 30-180 microns.
  • the conductive agent is one or more of carbon nanotubes, carbon black and graphene;
  • the binder is one or more of PVDF, PTFE, PEDOT and PAN;
  • a positive electrode sheet is also provided, which is prepared by the above preparation method.
  • a lithium ion battery including a positive pole piece, which is the above-mentioned positive pole piece, or a positive pole piece prepared by the above-mentioned preparation method.
  • Nickel-cobalt-manganese ternary positive electrode material LiNi 0.83 Co 0.11 Mn 0.06 O 2 , particle size D10 is 1-5 microns, D50 is 2-15 microns, and D90 is 5-30 microns.
  • the positive electrode material has a specific surface area of 0.1-1.5m 2 /g, a water content of less than 0.1%, and a pH of 10.5-12.5.
  • Conductive agent carbon nanotubes
  • Conductive agent slurry a slurry with a mass concentration of 0.6% formed by carbon nanotubes and water, with a viscosity of 800mP ⁇ s;
  • Binder slurry NMP solution of PVDF with a mass concentration of 0.8% and a viscosity of 1200mP ⁇ s;
  • the production method is as follows:
  • the binder remains on the surface of the primary coating powder to form an active powder.
  • an electrostatic spraying machine to electrostatically spray the active split on the surface of the aluminum foil.
  • the voltage of the electrostatic spraying machine is 20KV, and the thickness of the coated pole piece is controlled at 120 microns; after the electrostatic spraying, the temperature of the pressing roller during the rolling process is 120°C , the pressure is 12MPa, rolling 3 times to form a positive electrode sheet, the scanning electron microscope photo is shown in Figure 1.
  • the conductive agent slurry is a slurry formed of carbon nanotubes and water with a mass concentration of 0.8%, and a viscosity of 1500 mP ⁇ s.
  • the binder slurry is an NMP solution of PVDF with a mass concentration of 1.2% and a viscosity of 2000 mP ⁇ s.
  • the temperature of high-temperature compressed nitrogen is 80°C
  • the flow rate is 0.23m 3 /h
  • the atomization injection speed of the conductive agent slurry is 2g/min
  • the atomization injection speed of the binder slurry is 0.5g/min. min.
  • the voltage of electrostatic spraying is 10KV.
  • the conductive agent slurry is a slurry formed of carbon nanotubes and water with a mass concentration of 0.3%, and a viscosity of 500 mP ⁇ s.
  • the binder slurry is PVDF NMP solution with a mass concentration of 0.5% and a viscosity of 1000 mP ⁇ s.
  • the temperature of high-temperature compressed nitrogen is 150°C
  • the flow rate is 0.15m 3 /h
  • the atomization injection speed of the conductive agent slurry is 1.5g/min
  • the atomization injection speed of the binder slurry is 0.8g /min.
  • the voltage of electrostatic spraying is 50KV.
  • Example 1 The only difference from Example 1 is that a small amount of NMP (accounting for 1% of the weight of the powder) is added to the active powder for rolling, the temperature of the pressing roll is 80°C, and the pressure is 5MPa to form the front electrode sheet, and then the front electrode The sheet and the aluminum foil were subjected to the second roll pressing (a layer of front electrode sheet was placed on the upper and lower sides of the aluminum foil), the temperature of the pressing roll was 150° C., and the pressure was 5 MPa to obtain the positive electrode sheet.
  • NMP counting for 1% of the weight of the powder
  • Example 1 The only difference from Example 1 is that a small amount of NMP (accounting for 5% of the weight of the powder) is added to the active powder for rolling, the temperature of the pressing roll is 130 ° C, and the pressure is 130 MPa to form the front pole piece, and then the front pole The sheet and the aluminum foil were subjected to the second roll pressing (a layer of front electrode sheet was placed on the upper and lower sides of the aluminum foil), the temperature of the pressing roll was 70° C., and the pressure was 100 MPa to obtain the positive electrode sheet.
  • NMP counting for 5% of the weight of the powder
  • Example 1 the nickel-cobalt-manganese ternary positive electrode material LiNi 0.6 Co 0.1 Mn 0.3 O 2 , the particle size D10 is 1-5 microns, D50 is 2-15 microns, and D90 is 5-30 microns.
  • the positive electrode material has a specific surface area of 0.1-1.5m 2 /g, a water content of less than 0.1%, and a pH of 10.5-12.5.
  • the conductive agent is conductive carbon black
  • the conductive agent slurry is a slurry with a viscosity of 800mP s formed by conductive carbon black and water
  • the binder is PAN
  • the binder slurry is a viscosity of 1200mP s formed by dissolving PAN in NMP of slurry.
  • Example 2 The difference from Example 1 is that the production method is as follows: the positive electrode material, conductive agent, binder and solvent NMP are mixed to form a mixed slurry, wherein the weight ratio of the positive electrode material, conductive agent and binder is the same as that of the embodiment 1.
  • the mixed slurry was coated on the surface of the aluminum foil, dried and solidified to form a positive electrode sheet with a thickness of 110 microns, and its scanning electron microscope photo is shown in FIG. 2 .
  • Example 6 The difference from Example 6 is that the production method is as follows: the positive electrode material, conductive agent, binder and solvent NMP are mixed to form a mixed slurry, wherein the weight ratio of the positive electrode material, conductive agent and binder is the same as that of the embodiment 6. The mixed slurry was coated on the surface of the aluminum foil, dried and solidified to form a positive electrode sheet with a thickness of 110 microns.
  • Example 2 The difference from Example 1 is that the nickel-cobalt-manganese positive electrode material and the conductive agent carbon nanotubes are dry-mixed in a fluidized bed instead of atomizing and spraying the conductive agent into a slurry. Then, the binder slurry is sprayed into the fluidization chamber to spray and coat the dry-mixed positive electrode material and the conductive agent, during which the dry-mixed powder of the positive electrode material and the conductive agent is maintained in a fluidized state.
  • Battery energy density The positive pole pieces prepared by different schemes are assembled into a liquid pouch battery (capacity is about 5Ah), the negative electrode is made of artificial graphite, and the electrolyte composition is 1mol/L LiPF 6 EC/DMC (volume ratio 1:1) solution, the test current is 0.33C (discharge time 3 hours).
  • the pole piece particles of this scheme are combined and dense, and dense, and the compaction can reach 3.8-4.0g/cm 3 or even higher.
  • the particles are loosely bonded, and the compacted density is about 3.4-3.6g/cm 3 .

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Abstract

L'invention concerne une plaque d'électrode positive et un procédé de préparation associé, ainsi qu'une batterie au lithium-ion. Le procédé de préparation comprend les étapes suivantes : étape S1, au moyen d'un procédé à lit fluidisé, revêtir d'abord une surface d'un matériau d'électrode positive ternaire de nickel-cobalt-manganèse avec un agent conducteur pour former une première couche de revêtement, et la revêtir ensuite avec un liant pour former une seconde couche de revêtement, formant ainsi une poudre active ; et étape S2, revêtir une surface d'un collecteur de courant avec la poudre active au moyen d'un procédé de revêtement à sec, et la laminer ensuite pour obtenir la plaque d'électrode positive. Au moyen du procédé de préparation susmentionné de la présente demande, des solvants organiques tels que la NMP ne sont pas nécessaires, le processus est simplifié, et le coût est réduit. De manière plus importante, l'agent conducteur et le liant sont distribués de manière uniforme, et des particules sont étroitement agencées, ce qui augmente le taux d'utilisation d'espace et améliore la densité de compactage de la plaque d'électrode ; augmentant par conséquent la densité d'énergie d'une batterie au lithium-ion.
PCT/CN2022/106540 2021-08-25 2022-07-19 Plaque d'électrode positive et procédé de préparation associé, ainsi que batterie au lithium-ion Ceased WO2023024765A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110978218.4 2021-08-25
CN202110978218.4A CN113422006B (zh) 2021-08-25 2021-08-25 正极极片及其制备方法、锂离子电池

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