WO2024077965A1 - Matériau d'électrode positive et procédé de préparation associé, et batterie lithium-ion - Google Patents

Matériau d'électrode positive et procédé de préparation associé, et batterie lithium-ion Download PDF

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WO2024077965A1
WO2024077965A1 PCT/CN2023/096125 CN2023096125W WO2024077965A1 WO 2024077965 A1 WO2024077965 A1 WO 2024077965A1 CN 2023096125 W CN2023096125 W CN 2023096125W WO 2024077965 A1 WO2024077965 A1 WO 2024077965A1
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positive electrode
electrode material
lithium
slurry
mxene
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PCT/CN2023/096125
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Chinese (zh)
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刘毅
王雪莹
彭晓曦
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宁波容百新能源科技股份有限公司
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Publication of WO2024077965A1 publication Critical patent/WO2024077965A1/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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/90—Carbides
    • C01B32/914—Carbides of single elements
    • 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
    • H01M4/36—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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/11—Powder tap density
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties
    • 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 invention relates to the technical field of lithium ion batteries, and in particular to a positive electrode material and a preparation method thereof, and a lithium ion battery.
  • Lithium-ion batteries are widely used in many fields due to their advantages such as high working potential, high specific energy, and environmental friendliness. For example, electric vehicles, computers and other electronic products, etc.
  • the active composition especially the composition of the positive electrode material, often plays a decisive role in affecting the performance of lithium-ion batteries.
  • lithium iron phosphate with olivine structure Due to its high safety, low cost and high cycle stability, lithium iron phosphate with olivine structure has been successfully industrialized. On this basis, in order to further improve the energy density of lithium iron phosphate, lithium iron manganese phosphate came into being. Compared with lithium iron phosphate, although the energy density of lithium iron manganese phosphate has been improved, its capacity is difficult to volatilize due to its low ionic conductivity. In the prior art, in order to improve the ionic conductivity of lithium iron manganese phosphate materials, carbon coating is usually used to improve the ionic conductivity of lithium iron manganese phosphate materials.
  • this carbon-coated lithium iron manganese phosphate positive electrode material has a problem of deteriorating stability of the positive electrode material due to carbon deposition during the charge-discharge process. Therefore, the prior art lacks a positive electrode material with excellent energy density and ionic conductivity.
  • the embodiments of the present application provide a positive electrode material and a preparation method thereof, and a lithium-ion battery, which are used to improve the ionic conductivity of a lithium iron manganese phosphate positive electrode material, thereby improving the capacity of the positive electrode material.
  • an embodiment of the present application provides a positive electrode material, comprising: an inner layer material and a coating layer coating the inner layer material, the inner layer material is LiFe x Mn 1-x PO 4 , the coating layer comprises Nb 2 C MXene and carbon; wherein 0 ⁇ x ⁇ 0.5.
  • the embodiment of the present application coats the lithium iron manganese phosphate material, and on the basis of utilizing the good energy density and stability of lithium iron manganese phosphate, based on the fact that the Nb 2 C MXene coating layer has a two-dimensional graphene-like structure and good mechanical properties, the Nb 2 C MXene coating layer can coat the inner layer material (i.e., the lithium iron manganese phosphate material) in a stacked form, and improve the ionic conductivity of the positive electrode material, thereby improving the capacity of the above-mentioned positive electrode material.
  • the inner layer material i.e., the lithium iron manganese phosphate material
  • the coating layer can inhibit the side reaction between the lithium iron manganese phosphate material and the electrolyte, thereby improving the stability of the lithium iron manganese phosphate positive electrode material.
  • the Nb 2 C MXene coating layer can effectively inhibit the dissolution of manganese ions (Mn 2+ ) in the lithium iron manganese phosphate material in the above-mentioned positive electrode material during the charge-discharge process, thereby alleviating the problem that the continuous dissolution of manganese ions in the charge-discharge process causes the olivine-type lithium iron manganese phosphate material to be unstable in structure, thereby improving the stability of the lithium iron manganese phosphate positive electrode material.
  • the Nb2C Mxene in the coating layer is a two-dimensional layered structure
  • the two-dimensional layered structure can make the carbon in the coating layer relatively flat and stably distributed in the space between the layers, thereby avoiding the problem of carbon deposition due to the movement of carbon in the coating layer during the charge-discharge process, thereby further improving the stability of the lithium manganese iron phosphate positive electrode material.
  • the mass of the coating layer is 15wt%-19wt% of the mass of the inner layer material.
  • the mass ratio between the carbon and the Nb 2 C MXene in the coating layer is 2.40:1-4.67:1.
  • the coating layer has a thickness of 1-5 nm.
  • the compaction density of the positive electrode material is greater than 2.2 g/cm 3 .
  • the median particle size of the positive electrode material is 2-30 microns.
  • the present application provides a method for preparing a positive electrode material as described in the first aspect and any possible implementation manner, comprising:
  • the powder material is sintered at 680-800° C. for 5-20 hours to obtain a positive electrode material.
  • the solid content of the first slurry is 30%-80%, and the first slurry is obtained by a stirring device, wherein the rotation speed of the rotor in the stirring device is 1000-3000 rpm.
  • the added mass of the carbon source accounts for 12wt% to 14wt% of the mass of the lithium iron manganese phosphate
  • the added mass of the Nb2C MXene accounts for 3wt% to 5wt% of the mass of the lithium iron manganese phosphate.
  • the lithium iron manganese phosphate is obtained by reacting the ammonia manganese iron phosphate precursor with the lithium source.
  • the carbon source is at least one of sucrose, glucose, citric acid, polyvinyl alcohol, polyethylene glycol, carbon black, acetylene black, and graphene.
  • the following steps may be further performed:
  • the second slurry is filtered, washed and dried to obtain the ammonium manganese iron phosphate precursor; wherein the molecular formula of the ammonium manganese iron phosphate precursor is: NH 4 Mn 1-x Fe x PO 4 ⁇ H2O; 0 ⁇ x ⁇ 0.5.
  • the soluble phosphate is at least one of phosphoric acid, ammonium monohydrogen phosphate, ammonium dihydrogen phosphate, calcium dihydrogen phosphate, calcium phosphate, ammonium phosphate, calcium monohydrogen phosphate, and ammonium pyrophosphate.
  • the manganese source is at least one of manganese monoxide, manganese dioxide, trimanganese tetroxide, manganese sulfate, manganese carbonate, or manganese hydroxide.
  • the iron source is at least one of iron, ferrous sulfate, ferric oxide, ferric acetate, ferric phosphate, ferrous phosphate, ferrous monohydrogen phosphate, ferric dihydrogen phosphate, ferric nitrate, and ferric chloride.
  • the coprecipitation reaction is carried out in the presence of an antioxidant;
  • the added weight of the antioxidant accounts for 0.4wt%-0.6wt% of the weight of the iron source.
  • the antioxidant is ascorbic acid.
  • the protective atmosphere of the coprecipitation reaction is at least one of argon, nitrogen and carbon dioxide.
  • the following steps may be further included:
  • the washed precipitate is dried at -60°C to -20°C to obtain Nb 2 C MXene.
  • the present application also provides a lithium-ion battery, including:
  • the positive electrode material as described in the first aspect and any possible implementation manner or the positive electrode material obtained by the method as described in the second aspect and any possible implementation manner.
  • FIG1 is an electron microscope scanning image of Synthesis Example 1 provided in the examples of the present application.
  • FIG2 is a charge-discharge performance test diagram of device Example 1 provided in an embodiment of the present application.
  • FIG3 is an electron microscope scanning image of Synthesis Example 2 provided in the examples of the present application.
  • FIG4 is a charge-discharge performance test diagram of device embodiment 2 provided in an embodiment of the present application.
  • FIG5 is an electron microscope scanning image of Synthesis Example 3 provided in the examples of the present application.
  • FIG6 is a charge-discharge performance test diagram of device Example 3 provided in an embodiment of the present application.
  • FIG7 is an X-ray diffraction pattern of Synthesis Example 2 provided in the Examples of the present application.
  • FIG8 is an electron microscope scanning image of the synthetic comparative example 1 provided in the embodiment of the present application.
  • FIG9 is a comparison chart of the charge-discharge performance tests of device example 2, device comparative example 1, and device comparative example 2 provided in the embodiments of the present application.
  • the present application proposes a positive electrode material, which includes an inner layer material and a coating layer coating the inner layer material, wherein the inner layer material is LiFe x Mn 1-x PO 4 , and the coating layer includes Nb 2 C MXene and carbon; wherein 0 ⁇ x ⁇ 0.5.
  • the Nb 2 C MXene coating layer is coated on the inner layer material and the capacity of the positive electrode material is increased by utilizing the conductivity and mechanical properties of the Nb 2 C MXene coating layer.
  • Nb 2 C MXene can also effectively improve the positive electrode material of lithium manganese iron phosphate by inhibiting the side reaction between the inner layer material and the electrolyte and avoiding the dissolution of Mn 2+ , which causes the olivine structure of the positive electrode material to loosen and then collapse.
  • the above-mentioned coating layer also includes carbon, so that the electron transmission capacity of the positive electrode material is enhanced during the charge-discharge process.
  • the Nb2C MXene in the above-mentioned coating layer is a two-dimensional layered structure of Nb2C
  • the carbon is filled in the interlayer of the MXene structure, so that the carbon can be relatively evenly distributed in the coating layer and does not move with the charge-discharge process, thereby avoiding the problem of carbon deposition.
  • the thickness of the coating layer is 1-5 nm.
  • the mass ratio between carbon in the coating layer and the Nb 2 C MXene is 2.40:1-4.67:1, and the mass of the coating layer is 15wt%-19wt% of the mass of the inner layer material.
  • the primary particle size of the positive electrode material when the median particle size of the positive electrode material is 2-30 microns, the primary particle size of the positive electrode material is suitable, and the crystal phase grows completely, so it can show good electron transmission ability during the charge-discharge process. Accordingly, the discharge specific capacity of the positive electrode material corresponding to the lithium-ion battery is greater than 150mAh/g, and the first coulomb efficiency is greater than 95%.
  • the compaction density of the positive electrode material is greater than 2.2 g/cm 3 .
  • an embodiment of the present application provides a method for preparing the positive electrode material as described above, the method comprising:
  • Step 101 sand-milling a first slurry including an ammonium manganese iron phosphate precursor, a lithium source, a carbon source and Nb 2 C MXene to make the median particle size of the first slurry be 0.1-1.0 ⁇ m.
  • the molar ratio of the lithium source to the manganese iron phosphate ammonia precursor is 1:1-1:1.06.
  • the solvent is water.
  • the carbon source accounts for 12 wt% to 14 wt% of the lithium iron manganese phosphate, while the Nb 2 C MXene accounts for 3 wt% to 5 wt% of the lithium iron manganese phosphate.
  • the lithium iron manganese phosphate corresponds to the inner layer material in the target product, which is obtained by reacting the ammonium manganese iron phosphate precursor and the lithium source in step 103 .
  • the first slurry is obtained in a stirring device (e.g., a stirring kettle).
  • the speed of the rotor in the stirring device is 1000-3000 rpm, and the temperature in the stirring device is greater than 50° C.
  • the solid content of the first slurry is 30%-80%.
  • the carbon source is at least one of sucrose, glucose, citric acid, polyvinyl alcohol, polyethylene glycol, carbon black, acetylene black, and graphene.
  • soluble phosphate, ammonia, manganese source and iron source are mixed in water to perform a coprecipitation reaction to generate a second slurry containing a manganese phosphate iron ammonia precursor.
  • the molar ratio between the soluble phosphate and ammonia is 1:1 to 1.5-1.
  • the molar ratio between the manganese element and the iron element in the manganese source and the iron source relative to ammonia is x:1-x; wherein 0 ⁇ x ⁇ 0.5.
  • the soluble phosphate is at least one of phosphoric acid, monoammonium hydrogen phosphate, diammonium phosphate, dicalcium phosphate, calcium phosphate, ammonium phosphate, monocalcium phosphate, and ammonium pyrophosphate.
  • the concentration of the soluble phosphate solution is 1.0 mol/L to 1.5 mol/L.
  • concentration of ammonia water is 4.5 mol/L to 5.0 mol/L.
  • the manganese source is at least one of manganese monoxide, manganese dioxide, trimanganese tetraoxide, manganese sulfate, manganese carbonate, or manganese hydroxide.
  • the iron source is at least one of iron, ferrous sulfate, ferric oxide, ferric acetate, ferric phosphate, ferrous phosphate, ferrous monohydrogen phosphate, ferric dihydrogen phosphate, ferric nitrate, and ferric chloride.
  • the second slurry is filtered, washed and dried to obtain the manganese iron phosphate ammonia precursor; wherein the molecular formula of the manganese iron phosphate ammonia precursor is: NH 4 Fe x Mn 1-x PO 4 ⁇ H2O; 0 ⁇ x ⁇ 0.5.
  • the above-mentioned washing step can wash away impurities such as sulfate ions introduced by the iron source and/or manganese source.
  • drying temperature is 80-200° C.
  • drying time is 2-12 hours.
  • the coprecipitation reaction is carried out in the presence of an antioxidant, wherein the added mass of the antioxidant accounts for 0.4wt%-0.6wt% of the mass of the iron source.
  • the antioxidant can be ascorbic acid.
  • the protective atmosphere of the above coprecipitation reaction is at least one of argon, nitrogen and carbon dioxide, so as to ensure that any reactant and/or intermediate product does not undergo oxidation reaction during the coprecipitation reaction.
  • hydrofluoric acid or a mixture of lithium fluoride and hydrochloric acid is used as an etching solution and dissolved in water together with Nb 2 AlC to perform a corrosion reaction to obtain a third slurry containing Nb 2 C MXene.
  • the molar ratio of the solute to Nb 2 AlC in the etching solution is 1:1.05 to 1.5:1.
  • Step 102 Dry the first slurry to obtain a powder material.
  • the first slurry is dried by a spray dryer.
  • Corresponding drying parameters include: air inlet temperature of 150-360°C, air outlet temperature of 70-130°C, and atomizing disk rotation speed of 3000-20000 rpm.
  • Step 103 Sinter the powder material at 680-800° C. for 5-20 hours to obtain a positive electrode material.
  • the powder material Since the powder material has been ground in step 101, it has the characteristics of small particle size and similar size. Therefore, the crystal phase growth of the powder material is more uniform during the sintering process, which makes the primary particle size in the positive electrode material relatively uniform, thereby improving the electron transmission capacity of the positive electrode material during the charge-discharge process, so that the discharge specific capacity of the positive electrode material corresponding to the lithium-ion battery is greater than 150mAh/g, and the first coulomb efficiency is greater than 95%.
  • the inner layer material of the positive electrode material is LiFe x Mn 1-x PO 4 , and the coating layer includes Nb 2 C MXene and carbon, wherein 0 ⁇ x ⁇ 0.5.
  • MXene has high conductivity, rich surface Functional groups (e.g., -F, -O, -OH, etc.) and good mechanical properties can be adsorbed on the surface of the inner material in the form of deposition to form a coating layer under the action of lithium ions on the surface of the inner material during the sintering process, thereby promoting the release and embedding of lithium ions in the positive electrode material during the charge-discharge process.
  • rich surface Functional groups e.g., -F, -O, -OH, etc.
  • the carbon particles can combine with the Nb2C MXene structure and embed into the two-dimensional layered structure of Nb2C MXene, thereby promoting the electron transport capability and avoiding the phenomenon of carbon particles moving on the surface of the inner layer material to cause carbon deposition.
  • the inlet air temperature of the spray dryer is 180°C
  • the outlet air temperature is 85°C
  • the atomizing disk speed is 8000 rpm to obtain a powder material.
  • the material is LiFe 0.5 Mn 0.5 PO 4
  • the coating layer is Nb 2 C MXene and carbon. Please refer to Figure 1 for the morphology of the positive electrode material.
  • the inlet air temperature of the spray dryer is 190°C
  • the outlet air temperature is 90°C
  • the atomizing disk speed is 10000 rpm to obtain a powder material.
  • the inner layer material of the positive electrode material is LiFe 0.4 Mn 0.6 PO 4 , and the coating layer is Nb 2 C MXene and carbon. Please refer to FIG3 for the morphology of the positive electrode material, and refer to FIG7 for the XRD spectrum.
  • the inlet air temperature of the spray dryer is 200°C
  • the outlet air temperature is 100°C
  • the atomizing disk speed is 12000 rpm, to obtain a powder material.
  • the inner layer material of the positive electrode material is LiFe 0.5 Mn 0.5 PO 4
  • the coating layer is Nb 2 C MXene and carbon. Please refer to FIG5 for the morphology of the positive electrode material.
  • the inlet air temperature of the spray dryer is 190°C
  • the outlet air temperature is 90°C
  • the atomizing disk speed is 10000rpm, to obtain a powder material.
  • the inner layer material of the positive electrode material is LiFe 0.4 Mn 0.6 PO 4 , and the coating layer is carbon. Please refer to FIG8 for the morphology of the positive electrode material.
  • the inlet air temperature of the spray dryer is 190°C
  • the outlet air temperature is 90°C
  • the atomizing disk speed is 10000 rpm to obtain a powder material.
  • the inner layer material of the positive electrode material is LiFe 0.4 Mn 0.6 PO 4 , and the coating layer is Nb 2 C MXene.
  • Device Examples 1-3 and Device Comparative Examples 1-2 are button-type batteries prepared using Synthesis Examples 1-3 and Synthesis Comparative Examples 1-2 as positive electrode materials, respectively.
  • the positive electrode sheet in device examples 1-3 and device comparative example 1 is coated with 8-10 mg/ cm2 of positive electrode material on one side relative to the negative electrode sheet, and the positive electrode is a circular aluminum sheet with a diameter of 15MM.
  • the electrolyte of device examples 1-3 and device comparative example 1 is 1 mol/L LiPF6 mixed in a mixture of ethylene carbonate and dimethyl carbonate (EC/DMC) with a molar ratio of 1:1.
  • the negative electrode is a lithium sheet.
  • the discharge capacity and the first coulomb efficiency were tested for the device embodiments 1-3 and the device comparative examples 1-2. Please refer to FIG. 2 , FIG. 4 , FIG. 6 , and FIG. 9 for the test diagrams, and refer to Table 1 for the test data.

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Abstract

Visant à aborder le problème de l'absence d'un matériau d'électrode positive possédant à la fois une bonne densité d'énergie et une bonne conductivité ionique dans l'état de la technique, les modes de réalisation de la présente demande concernent un matériau d'électrode positive et un procédé de préparation associé, ainsi qu'une batterie lithium-ion, de façon à améliorer la conductivité ionique d'un matériau d'électrode positive de phosphate de fer-manganèse-lithium, améliorant ainsi la capacité du matériau d'électrode positive. Le matériau d'électrode positive comprend un matériau de couche interne et une couche de revêtement qui recouvre le matériau de couche interne, le matériau de couche interne équivalant à LiFexMn1-xPO4, la couche de revêtement comprenant du Nb2C MXène et du carbone, où 0 < x ≤ 0,5.
PCT/CN2023/096125 2022-10-12 2023-05-24 Matériau d'électrode positive et procédé de préparation associé, et batterie lithium-ion WO2024077965A1 (fr)

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CN115799519B (zh) * 2023-02-08 2023-06-06 中国人民解放军国防科技大学 改性富锂层状氧化物正极材料及其制备方法和应用

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