WO2024021277A1 - Matériau d'électrode positive ternaire et son procédé de préparation, feuille d'électrode positive et batterie - Google Patents

Matériau d'électrode positive ternaire et son procédé de préparation, feuille d'électrode positive et batterie Download PDF

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WO2024021277A1
WO2024021277A1 PCT/CN2022/120640 CN2022120640W WO2024021277A1 WO 2024021277 A1 WO2024021277 A1 WO 2024021277A1 CN 2022120640 W CN2022120640 W CN 2022120640W WO 2024021277 A1 WO2024021277 A1 WO 2024021277A1
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coating layer
lithium nickel
nickel cobalt
boron
iron
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PCT/CN2022/120640
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English (en)
Chinese (zh)
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李爱霞
余海军
谢英豪
李长东
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广东邦普循环科技有限公司
湖南邦普循环科技有限公司
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Publication of WO2024021277A1 publication Critical patent/WO2024021277A1/fr

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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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0438—Processes of manufacture in general by electrochemical processing
    • H01M4/045—Electrochemical coating; Electrochemical impregnation
    • H01M4/0457—Electrochemical coating; Electrochemical impregnation from dispersions or suspensions; Electrophoresis
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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 invention relates to the field of battery technology, and specifically to a ternary positive electrode material and a preparation method thereof, a positive electrode sheet and a battery.
  • Ternary cathode materials especially high-nickel cathode materials, have poor cycle performance. Their surfaces are generally protected by surface coating to avoid direct contact between the electrolyte and cathode materials to improve cycle performance.
  • some existing coatings such as those prepared by co-precipitation method, have poor bonding properties and are prone to falling off during circulation. Therefore, there is currently a lack of a ternary cathode material that can ensure both cycle performance and the bonding strength of the coating layer.
  • the purpose of the present invention is to provide a ternary cathode material that can ensure both cycle performance and coating layer bonding strength and a preparation method thereof.
  • the present invention also aims to provide a positive electrode sheet and battery, which include the above-mentioned ternary positive electrode material. Therefore, it has the advantage of excellent cycle performance.
  • the present invention provides a ternary cathode material, including:
  • the iron phosphate coating layer is coated on the outer peripheral side of the lithium nickel cobalt manganate base material
  • the boron coating layer is coated on the outer peripheral side of the iron phosphate coating layer, and part of the boron coating layer penetrates through the pores of the iron phosphate coating layer to bond with the outer surface of the lithium nickel cobalt manganate base material.
  • the mass of the iron phosphate coating layer accounts for 0.5-5% of the total mass of the ternary cathode material.
  • the mass of the boron coating layer accounts for 0.5-5% of the total mass of the ternary cathode material.
  • the present invention provides a method for preparing the ternary cathode material of any one of the aforementioned embodiments, including:
  • the suspension is obtained by dispersing a lithium nickel cobalt manganate base material in a first solvent, and the first solvent includes an organic solvent or water;
  • the iron phosphorus solution is obtained by co-dispersing the iron source and the phosphorus source in a second solvent, and the second solvent includes water.
  • the iron source includes a water-soluble iron salt; and/or the phosphorus source includes at least one of phosphoric acid and a water-soluble phosphorus salt; and/or the boron source includes boron oxide , at least one of boric acid and borate.
  • the concentration of iron ions is 0.05-2.5 mol/L
  • the concentration of phosphate is 0.05-2.5 mol/L.
  • the drying temperature is 100-250°C, the drying time is 4-6h; and/or the sintering temperature of the first sintering is 400-800°C, the sintering time is 6-12h, the sintering environment It is a pure oxygen environment; and/or, the sintering temperature for the second sintering is 700-800°C, the sintering time is 4-8 hours, and the sintering environment is a pure oxygen environment.
  • the present invention provides a positive electrode sheet, including:
  • the cathode active material layer is obtained by coating at least one side of the cathode current collector with a cathode active slurry; the cathode active slurry includes the ternary cathode material of any one of the preceding embodiments.
  • the present invention provides a battery including the positive electrode sheet of the aforementioned embodiment.
  • Embodiments of the present invention provide a ternary cathode material, which includes a lithium nickel cobalt manganate base material, an iron phosphate coating layer and a boron coating layer; the iron phosphate coating layer is coated on the lithium nickel cobalt manganate base material
  • the boron coating layer covers the outer peripheral side of the iron phosphate coating layer, and part of the boron coating layer penetrates through the pores of the iron phosphate coating layer to bond with the outer surface of the lithium nickel cobalt manganate base material.
  • the direct contact between the substrate and the electrolyte can be reduced, and the cycle performance of the substrate can be improved; at the same time, through the setting of the boron coating layer, the pores of the iron phosphate coating layer can be filled, This can further prevent the electrolyte from contacting the substrate and further improve the cycle performance of the substrate; on the other hand, the boron coating penetrates through the pores of the iron phosphate coating and combines with the outer surface of the substrate, which can improve the performance of the iron phosphate coating.
  • the bonding strength between the layer and the substrate can be improved, and the excellent conductivity of boron can be used to form a conductive network after filling the pores of the iron phosphate coating layer, fully improving the stability of the iron phosphate coating layer and fully ensuring the cycle performance of the substrate.
  • Embodiments of the present invention provide a method for preparing a ternary cathode material.
  • This method can first coat the surface of a substrate to form an iron phosphate coating layer through a precipitation method, which can reduce direct contact between the substrate and the electrolyte, and can improve the base material.
  • the cycle performance of the material; this method can also coat the outer circumference of the iron phosphate coating with a boron coating layer through a solid-phase method, and enable the part of the boron coating layer to fill the pores, and penetrate through the pores to connect with the outside of the substrate.
  • Embodiments of the present invention also provide a cathode sheet and a battery, which include the above-mentioned ternary cathode material. Therefore, it has the advantage of excellent cycle performance.
  • Figure 1 is an SEM image of the ternary cathode material provided in Embodiment 1 of the present invention.
  • Embodiments of the present invention provide a ternary cathode material, which includes a lithium nickel cobalt manganate base material, an iron phosphate coating layer, and a boron coating layer.
  • the iron phosphate coating layer coats the outer peripheral side of the lithium nickel cobalt manganate base material.
  • the boron coating layer covers the outer peripheral side of the iron phosphate coating layer, and part of the boron coating layer penetrates through the pores of the iron phosphate coating layer to combine with the outer surface of the lithium nickel cobalt manganate base material.
  • the direct contact between the substrate and the electrolyte can be reduced, and the cycle performance of the substrate can be improved; at the same time, through the setting of the boron coating layer, the pores of the iron phosphate coating layer can be filled, This can further prevent the electrolyte from contacting the substrate and further improve the cycle performance of the substrate; on the other hand, the boron coating penetrates through the pores of the iron phosphate coating and combines with the outer surface of the substrate, which can improve the performance of the iron phosphate coating.
  • the bonding strength between the layer and the substrate can be improved, and the excellent conductivity of boron can be used to form a conductive network after filling the pores of the iron phosphate coating layer, fully improving the stability of the iron phosphate coating layer and fully ensuring the cycle performance of the substrate.
  • the mass of the iron phosphate coating layer accounts for 0.5-5% of the total mass of the ternary cathode material. That is, the coating amount of the iron phosphate coating layer is 0.5-5%.
  • the coating amount of the iron phosphate coating layer is 0.5-5%.
  • the mass of the boron coating layer accounts for 0.5-5% of the total mass of the ternary cathode material.
  • Embodiments of the present invention also provide a method for preparing the ternary cathode material with the above structure, which includes:
  • the suspension is obtained by dispersing the lithium nickel cobalt manganate substrate into a first solvent.
  • the dispersion process can be performed in a stirrer, and the first solvent includes an organic solvent or water.
  • the iron phosphorus solution is obtained by co-dispersing the iron source and the phosphorus source in a second solvent.
  • the dispersion process can also be performed in a stirrer, and the second solvent includes water.
  • the iron source can be selected as a water-soluble iron salt, for example, ferric nitrate, ferric chloride, etc. can be selected.
  • the phosphorus source includes at least one of phosphoric acid and water-soluble phosphorus salts.
  • either phosphoric acid or water-soluble phosphorus salts such as sodium phosphate and diammonium hydrogen phosphate can be selected.
  • the surface of the substrate can be coated with a precipitation method to form an iron phosphate coating layer, which can reduce the direct contact between the substrate and the electrolyte and improve the cycle performance of the substrate.
  • an iron phosphate coating layer is formed through co-precipitation, making the iron phosphate coating layer porous.
  • the concentration of iron ions is 0.05-2.5 mol/L
  • the concentration of phosphate is 0.05-2.5 mol/L.
  • the drying temperature is 100-250°C, and the drying time is 4-6 hours. As the drying temperature increases, the drying time shortens and can be adjusted according to needs.
  • the sintering temperature for the first sintering is 400-800°C, the sintering time is 6-12 hours, and the sintering environment is a pure oxygen environment. As the sintering temperature increases, the sintering time also shortens.
  • the operating efficiency can be ensured, and the formation efficiency and quality of the iron phosphate coating layer can be ensured; on the other hand, the formation of pores in the iron phosphate coating layer can be ensured, so as to ensure the formation of pores in the iron phosphate coating layer. It can facilitate the thickness of the boron source coating process and facilitate the penetration of the boron source to further improve the bonding strength between the iron phosphate coating layer and the substrate, and at the same time improve the stability of the iron phosphate coating layer to improve the cycle performance of the substrate. .
  • the boron source can be selected from boron oxide, boric acid or borate.
  • the boron source and the lithium nickel cobalt manganate substrate coated with an iron phosphate coating are mixed by using a ball mill, which can improve Particle uniformity.
  • the boron coating layer can be formed on the outer peripheral side of the iron phosphate coating layer by solid phase method, and the boron coating layer can fill the pores and penetrate into the nickel, cobalt and manganese through the pores. bonded to the outer surface of the lithium acid substrate.
  • the boron coating layer is coated on the outer peripheral side of the iron phosphate coating layer through the solid phase method, so that part of the boron coating layer can fill the pores, penetrate through the pores and combine with the outer surface of the substrate, which can further prevent the electrolyte In contact with the substrate, the cycle performance of the substrate can also improve the bonding strength between the iron phosphate coating layer and the substrate.
  • the excellent conductivity of boron can also be used to form a conductive network after filling the pores of the iron phosphate coating layer. Fully improve the stability of the iron phosphate coating layer and fully ensure the cycle performance of the substrate.
  • the sintering temperature of the second sintering is 700-800°C
  • the sintering time is 4-8 hours
  • the sintering environment is a pure oxygen environment.
  • the purpose of the second sintering is to achieve coating of the boron source through the solid-phase method to obtain a ternary material coated with boron and ferrophosphate.
  • the coating quality of the boron coating layer can be ensured, and the part of the boron coating layer can penetrate through the pores and combine with the substrate, so as to be able to Fully improve the bonding strength between the iron phosphate coating layer and the base material, and improve the cycle performance of the entire ternary cathode material; on the other hand, it can also ensure the uniformity of the boron coating layer when it penetrates into multiple pores to ensure that it can be used in the iron phosphate
  • a conductive network is formed in the coating layer to fully improve the stability of the iron phosphate coating layer to further improve the cycle performance of the ternary cathode material.
  • Embodiments of the present invention also provide a cathode sheet, which includes a cathode current collector and a cathode active material layer.
  • the positive electrode current collector may be aluminum foil or a composite current collector. The embodiments of the present invention will be described using aluminum foil as an example.
  • the positive active material layer is obtained by coating the positive active slurry on at least one side of the positive current collector and then drying.
  • the positive electrode active slurry includes the above-mentioned ternary positive electrode material, and also includes a conductive agent, a binder and a solvent.
  • the conductive agent can be acetylene black, carbon black, etc.
  • the binder can be polyvinyl fluoride (PVDF).
  • the solvent can be N-methylpyrrolidone.
  • the mass ratio of the ternary cathode material, the conductive agent and the binder can be selected as (5-10): (0.1-1): (0.1-1). For example, the mass ratio can be selected as 9.2:0.5:0.3.
  • the drying temperature can be selected from 80-120°C, and the drying time can be selected from 10-24h.
  • the positive electrode sheet is prepared from the above-mentioned ternary positive electrode material. Therefore, the positive electrode sheet also has the characteristics of excellent cycle performance.
  • An embodiment of the present invention also provides a battery, which includes the above-mentioned positive electrode sheet, a casing, a negative electrode sheet, a separator, and an electrolyte.
  • the positive electrode sheet, separator and negative electrode sheet are stacked in sequence and laminated or rolled to form an electrode core. After the electrode core is installed into the case and the electrolyte is injected, the battery can be obtained.
  • the battery may be a rectangular lithium-ion battery, a cylindrical battery or a button battery. The embodiments of the present invention will be described using a button battery as an example.
  • the negative electrode sheet can be selected as a metal lithium sheet, or it can be selected as a composite structure formed by a current collector and a negative electrode active layer, and the active particles in the negative electrode active layer can be selected as graphite, etc.
  • the embodiments of the present invention are Let's take a metal lithium sheet as an example.
  • the separator can be made of PP material, PE (polyethylene) material, or a composite structure obtained by combining PP (polypropylene) material and PE material.
  • the embodiments of the present invention are all carried out using PP as an example. illustrate.
  • the electrolyte can be a mixed solution of lithium hexafluorophosphate, and specifically the LiPF 6 -EC/DMC system, where EC is ethylene carbonate and DMC is dimethyl carbonate.
  • the battery includes the above-mentioned positive electrode sheet. Therefore, the battery also has the advantage of high cycle performance.
  • This embodiment provides a battery, which is prepared by the following method:
  • step S1 Prepare the ternary cathode material, and step S1 specifically includes:
  • Step S2 specifically includes selecting aluminum foil as the cathode current collector, coating the cathode active slurry on both sides of the aluminum foil, air drying at 80°C for 8 hours, and then vacuum drying at 120°C for 12 hours; wherein, the cathode active slurry includes step S1
  • the prepared ternary cathode material also includes a conductive agent, a binder and a solvent.
  • the conductive agent is acetylene black
  • the binder is PVDF
  • the solvent is N-methylpyrrolidone
  • the ternary cathode material the conductive agent and the binder.
  • the mass ratio of the three is 9.2:0.5:0.3.
  • the metal lithium sheet as the negative electrode sheet, the structure prepared by S2 as the positive electrode sheet, PP as the separator, and 1M LiPF6-EC/DMC (1:1, v/v) as the electrolyte in an argon-protected glove box.
  • the 2032 type button battery was obtained during the assembly.
  • step S1 specifically includes:
  • step S1 specifically includes:
  • Comparative Example 1 provides a battery, and its difference from the battery preparation method provided in Example 1 is that in Comparative Example 1, step S1 specifically includes:
  • Comparative Example 2 provides a battery, and its difference from the battery preparation method provided in Example 1 is that in Comparative Example 2, step S1 specifically includes:
  • Example 1 195.2 179.4 91.9%
  • Example 2 198.4 179.2 90.3%
  • Example 3 193.3 173.8 89.9% Comparative example 1 199.7 169.1 84.7% Comparative example 2 200.6 168.4 83.4%
  • the batteries provided by Examples 1-3 of the present invention are coated with both iron phosphate and boron.
  • the battery prepared from the cathode material has better cycle performance and excellent cycle stability.
  • embodiments of the present invention provide a ternary cathode material and a preparation method thereof that can ensure both cycle performance and coating layer bonding strength.
  • Embodiments of the present invention also provide a cathode sheet and a battery, which include the above-mentioned ternary cathode material. Therefore, it has the advantage of excellent cycle performance.

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Abstract

La présente invention concerne un matériau d'électrode positive ternaire et son procédé de préparation, une feuille d'électrode positive et une batterie. Le matériau d'électrode positive ternaire comprend un matériau de base de lithium-nickel-cobalt-manganate, une couche de revêtement de phosphate ferrique et une couche de revêtement de bore ; le côté circonférentiel externe du matériau de base de lithium-nickel-cobalt-manganate est revêtu de la couche de revêtement de phosphate ferrique ; le côté circonférentiel externe de la couche de revêtement de phosphate ferrique est revêtu de la couche de revêtement de bore ; et la couche de revêtement de bore pénètre à travers les pores de la couche de revêtement de phosphate ferrique et est ensuite liée à la surface externe du matériau de base de lithium-nickel-cobalt-manganate. D'une part, la couche de revêtement de phosphate ferrique peut réduire le contact direct entre le matériau de base de lithium-nickel-cobalt-manganate et un électrolyte, et améliorer les performances de cycle du matériau de base de lithium-nickel-cobalt-manganate ; la couche de revêtement de bore peut remplir les pores de la couche de revêtement de phosphate ferrique, ce qui permet d'empêcher en outre l'électrolyte d'être en contact avec le matériau de base de lithium-nickel-cobalt-manganate, et d'améliorer les performances de cycle du matériau de base de lithium-nickel-cobalt-manganate. En outre, la liaison de la couche de revêtement de bore et du matériau de base de lithium-nickel-cobalt-manganate peut améliorer la force de liaison de la couche de revêtement de phosphate ferrique et du matériau de base de lithium-nickel-cobalt-manganate, et enfin, le bore présente une excellente conductivité, un réseau conducteur peut être formé après le remplissage des pores, et la stabilité de la couche de revêtement de phosphate ferrique est entièrement améliorée.
PCT/CN2022/120640 2022-07-28 2022-09-22 Matériau d'électrode positive ternaire et son procédé de préparation, feuille d'électrode positive et batterie WO2024021277A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170365859A1 (en) * 2016-06-17 2017-12-21 Samsung Electronics Co., Ltd. Composite cathode active material for lithium battery, cathode for lithium battery including the same, and lithium battery including the cathode
CN113707859A (zh) * 2021-08-23 2021-11-26 蜂巢能源科技有限公司 一种元素掺杂和双层包覆的正极材料、制备方法及锂电池
CN113937267A (zh) * 2021-09-30 2022-01-14 蜂巢能源科技有限公司 正极材料、其制备方法、包括其的正极和锂离子电池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170365859A1 (en) * 2016-06-17 2017-12-21 Samsung Electronics Co., Ltd. Composite cathode active material for lithium battery, cathode for lithium battery including the same, and lithium battery including the cathode
CN113707859A (zh) * 2021-08-23 2021-11-26 蜂巢能源科技有限公司 一种元素掺杂和双层包覆的正极材料、制备方法及锂电池
CN113937267A (zh) * 2021-09-30 2022-01-14 蜂巢能源科技有限公司 正极材料、其制备方法、包括其的正极和锂离子电池

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIU XIZHENG; LI HUIQIAO; YOO EUNJOO; ISHIDA MASAYOSHI; ZHOU HAOSHEN: "Fabrication of FePO4layer coated LiNi1/3Co1/3Mn1/3O2: Towards high-performance cathode materials for lithium ion batteries", ELECTROCHIMICA ACTA, ELSEVIER, AMSTERDAM, NL, vol. 83, 1 January 1900 (1900-01-01), AMSTERDAM, NL , pages 253 - 258, XP028945047, ISSN: 0013-4686, DOI: 10.1016/j.electacta.2012.07.111 *
WANG ZHIYUAN; LIU ENZUO; HE CHUNNIAN; SHI CHUNSHENG; LI JIAJUN; ZHAO NAIQIN: "Effect of amorphous FePO4coating on structure and electrochemical performance of Li1.2Ni0.13Co0.13Mn0.54O2as cathode material for Li-ion batteries", JOURNAL OF POWER SOURCES, ELSEVIER, AMSTERDAM, NL, vol. 236, 16 February 2013 (2013-02-16), AMSTERDAM, NL, pages 25 - 32, XP028586801, ISSN: 0378-7753, DOI: 10.1016/j.jpowsour.2013.02.022 *

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