WO2022134541A1 - Matériau d'électrode positive, procédé de préparation associé et dispositif électrochimique - Google Patents

Matériau d'électrode positive, procédé de préparation associé et dispositif électrochimique Download PDF

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Publication number
WO2022134541A1
WO2022134541A1 PCT/CN2021/105205 CN2021105205W WO2022134541A1 WO 2022134541 A1 WO2022134541 A1 WO 2022134541A1 CN 2021105205 W CN2021105205 W CN 2021105205W WO 2022134541 A1 WO2022134541 A1 WO 2022134541A1
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positive electrode
lithium
electrode material
electrochemical device
crystal structure
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PCT/CN2021/105205
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English (en)
Chinese (zh)
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吴霞
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宁德新能源科技有限公司
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Publication of WO2022134541A1 publication Critical patent/WO2022134541A1/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
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • 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
    • 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
    • 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 field of electrochemistry, and in particular, to a positive electrode material, a preparation method thereof, and an electrochemical device.
  • Electrochemical devices such as lithium-ion batteries
  • LiCoO 2 cathode material which has an R-3m phase structure and a theoretical capacity of 273.8mAh/g. It has good cycle and safety performance, high compaction density and simple preparation process. . Since its commercialization by Sony in 1991, LiCoO 2 cathode materials have dominated the lithium-ion battery materials market. In order to obtain higher specific energy, LiCoO 2 is developing towards high voltage (>4.6Vvs.Li/Li + ). However, when LiCoO 2 is charged to 4.5V, the capacity can only reach 190mAh/g.
  • metal cations such as Al, Mg, Ti, Zn, and Ni are generally used in the industry and scientific research community for bulk doping to improve the structural stability of R-3m phase LiCoO 2 .
  • the doping of most elements improves the structural stability of the material by delaying the irreversible phase transition, but the effect of this method on the structure stability is not obvious at voltages higher than 4.6V.
  • the doping amount increases, the theoretical capacity loss will increase. Therefore, there is an urgent need to find a cathode material for lithium-ion batteries with high specific capacity, high voltage platform, good structural reversibility, and interface stability at high voltage.
  • the purpose of the present application is to provide a positive electrode material, which has good interface stability, high capacity and cycle stability.
  • the present application provides a composite positive electrode material, including lithium cobalt oxide with a P6 3 mc crystal structure and lithium manganese oxide with a C2/m crystal structure; in the XRD pattern of the positive electrode material, it is located at 17°
  • the characteristic peak intensity in the range of -19° is I A
  • the characteristic peak intensity in the range of 19°-22° is I B , 0.1 ⁇ IB / IA ⁇ 0.5 .
  • the average particle diameter D1 of the lithium cobalt oxide having the P6 3 mc crystal structure and the average particle diameter D2 of the lithium manganese oxide having the C2/m crystal structure satisfy: 0.1 ⁇ D2/D1 ⁇ 0.5.
  • the average particle size D1 is 5 ⁇ m to 30 ⁇ m; the average particle size D2 is 1 ⁇ m to 5 ⁇ m.
  • the lithium cobalt oxide includes Li and Co elements and optionally includes at least one of M element or Na element, wherein M element includes Al, Mg, Ti, Mn, Fe, Ni, Zn, At least one of Cu, Nb, Cr, Y or Zr; the sum of the molar content of Co and M elements is n Co+M , the molar content of Li element is n Li , and the ratio x of n Li to n Co+M is 0.6 ⁇ x ⁇ 0.95, the molar content of M element is n M , the ratio of n M to n Co+M y is 0 ⁇ y ⁇ 0.15, the molar content of Na element is n Na , the ratio of n Na to n Co+M z is 0 ⁇ z ⁇ 0.03.
  • M element includes Al, Mg, Ti, Mn, Fe, Ni, Zn, At least one of Cu, Nb, Cr, Y or Zr
  • the sum of the molar content of Co and M elements is n Co+M
  • the lithium cobalt oxide includes Li x Na z Co 1-y My O 2 , 0.6 ⁇ x ⁇ 0.95, 0 ⁇ y ⁇ 0.15, 0 ⁇ z ⁇ 0.03, and M includes Al, Mg, Ti, At least one of Mn, Fe, Ni, Zn, Cu, Nb, Cr, Y, and Zr.
  • the lithium manganese oxide includes Li 2 ⁇ h Mn 1-g T g O k , 0 ⁇ h ⁇ 1, 0 ⁇ g ⁇ 0.5, 0 ⁇ k ⁇ 5, T includes Ti, Sn, Ru, At least one of Ni, Co and Al.
  • the present application further provides an electrochemical device including a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, and the positive electrode sheet includes the positive electrode material of the present application.
  • the electrolyte includes a carboxylate.
  • the carboxylates include at least one of the following: pentasodium diethylenetriaminepentaacetate, sodium nitrilotriacetate, sodium edetate, sodium gluconate.
  • the mass percentage content of the carboxylate is 0.01% to 0.15% based on the mass of the electrolyte.
  • the cathode material provided by the present application has good interface stability, high capacity characteristics and cycle stability.
  • the "average particle size” means that the material powder is photographed and observed by a SEM scanning electron microscope, and then, 10 material particles are randomly selected from the SEM photograph using image analysis software, and these The respective areas of the material particles, and then, assuming that the material particles are spherical, the respective particle diameters R (diameter) are obtained by the following formula:
  • R 2 ⁇ (S/ ⁇ ) 1/2 ; wherein, S is the area of the material particle;
  • the process of obtaining the particle diameter R of the material particles was performed on 10 SEM images, and the particle diameters of the obtained 100 (10 ⁇ 10) material particles were arithmetically averaged to obtain the average particle diameter of the material particles.
  • the positive electrode material of the present application the preparation method thereof, and the electrochemical device of the present application will be described in detail below.
  • the cathode material of the present application includes lithium cobalt oxide with a P6 3 mc crystal structure and lithium manganese oxide with a C2/m crystal structure; in the XRD pattern of the cathode material, it is located in the range of 17°-19°
  • the peak intensity of the characteristic peak (P6 3 mc structure peak) within 19°-22° is I A
  • the characteristic peak intensity (C2/m peak) in the range of 19°-22° is I B , 0.1 ⁇ IB / IA ⁇ 0.5 .
  • Lithium cobalt oxide with P6 3 mc crystal structure has a stable oxygen structure, is not easy to release oxygen at high voltage, has a stable structure, and thus has good cycle performance. In addition, it has lithium ion accepting ability, which can absorb additional lithium ions.
  • the theoretical capacity (>300mAh/g) of lithium manganese oxide with C2/m crystal structure is higher than that of P6 3 mc cathode material.
  • the lithium cobalt oxides of mc are compounded together, which can well combine the advantages of the two materials and solve their respective shortcomings.
  • the characteristic peak intensity (P63mc structure peak) in the range of 17°-19° is IA
  • the characteristic peak intensity (C2/m peak) in the range of 19°-22° is When I B , 0.1 ⁇ I B /I A ⁇ 0.5, on the one hand, there is a sufficient amount of lithium manganese oxide in the positive electrode material to provide lithium ions for the lithium cobalt oxide with P6 3 mc crystal structure, and to supplement the formation of the SEI film. On the other hand, the excess of lithium manganese oxide is avoided, thereby greatly improving the cycle stability of the cathode material.
  • the average particle size D1 of the lithium cobalt oxide having the P6 3 mc structure and the average particle size D2 of the lithium manganese oxide having the C2/m crystal structure satisfy: 0.1 ⁇ D2/D1 ⁇ 0.5. Satisfying the above particle size relationship, the small particles of lithium manganese oxide that play the role of supplementing lithium can mainly exist in the pores between the large particle size lithium cobalt oxides, reducing the change of the lithium manganese oxide structure due to the cycle process. It adversely affects the active connections between Li-Co oxides, thereby maintaining high cycling stability.
  • the average particle size D1 is 5 ⁇ m to 30 ⁇ m; the average particle size D2 is 1 ⁇ m to 5 ⁇ m.
  • the method for confirming holes and gaps includes: using an ion polishing machine (JEOL-IB-09010CP) to process the material to obtain a cross-section; using SEM to photograph the cross-section with a shooting magnification of not less than 5.0K to obtain Grain images, in which closed areas of a different color than the surrounding are holes and cracks.
  • the closed area refers to an area enclosed by closed lines in the image, and the line connecting any point inside the closed area and any point outside the area intersects the boundary of the area.
  • the hole selection requirements may be: in a single particle in the image, the ratio of the longest axis of the closed area to the longest axis of the particle is not higher than 10%, and the difference between the longest axis and the shortest axis of the closed area is less than 0.5 microns;
  • the requirements for the selection of cracks can be as follows: the ratio of the longest axis of the closed region in a single particle to the longest axis of the particle is not less than 70%.
  • the lithium cobalt oxide includes Li and Co elements and optionally includes at least one of M element or Na element, wherein M element includes Al, Mg, Ti, Mn, Fe, Ni, Zn, At least one of Cu, Nb, Cr, Y or Zr; the sum of the molar content of Co and M elements is n Co+M , the molar content of Li element is n Li , and the ratio x of n Li to n Co+M is 0.6 ⁇ x ⁇ 0.95, the molar content of M element is n M , the ratio of n M to n Co+M y is 0 ⁇ y ⁇ 0.15, the molar content of Na element is n Na , the ratio of n Na to n Co+M z is 0 ⁇ z ⁇ 0.03.
  • M element includes Al, Mg, Ti, Mn, Fe, Ni, Zn, At least one of Cu, Nb, Cr, Y or Zr
  • the sum of the molar content of Co and M elements is n Co+M
  • the lithium cobalt oxide includes Li x Na z Co 1-y My O 2 , 0.6 ⁇ x ⁇ 0.95, 0 ⁇ y ⁇ 0.15, 0 ⁇ z ⁇ 0.03, and M includes Al, Mg, Ti, At least one of Mn, Fe, Ni, Zn, Cu, Nb, Cr, Y, and Zr.
  • the lithium manganese oxide includes Li 2 ⁇ h Mn 1-g T g O k , 0 ⁇ h ⁇ 1, 0 ⁇ g ⁇ 0.5, 0 ⁇ k ⁇ 5, T includes Ti, Sn, Ru, At least one of Ni, Co and Al.
  • the method for preparing the positive electrode material of the present application comprises the steps of:
  • step b Use the Nan Co 1-y My O 2 obtained in step a as the precursor, mix it with the lithium-containing molten salt uniformly, and react at 200°C-400°C in an air atmosphere. After the reaction is completed, the reactant is subjected to Deionized water was washed several times, and after the molten salt was cleaned, the powder was dried to obtain Li x Na z Co 1-y My O 2 with a hexagonal close-packed (HCP) oxygen structure, where 0.6 ⁇ x ⁇ 0.85, 0 ⁇ y ⁇ 0.15, 0 ⁇ z ⁇ 0.03;
  • HCP hexagonal close-packed
  • step d Mix the products obtained in step b and step c uniformly according to a certain proportion to obtain the positive electrode material of the present application.
  • the M element is selected from at least one of Al, Mg, Ti, Mn, Fe, Ni, Zn, Cu, Nb, Cr, Y, and Zr.
  • the precipitating agent comprises sodium carbonate.
  • the complexing agent comprises aqueous ammonia.
  • step a the pH is 5-9.
  • the T element includes at least one of Ti, Sn, Ru, Ni, Co, and Al.
  • step d the mass ratio of the product obtained in step c mixed with the product obtained in step b is m, and 0 ⁇ m ⁇ 0.2.
  • the electrochemical device of the present application is, for example, a primary battery or a secondary battery.
  • the secondary battery is, for example, a lithium secondary battery, and the lithium secondary battery includes, but is not limited to, a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery.
  • the electrochemical device includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte.
  • the positive electrode sheet is known in the art as a positive electrode sheet that can be used in electrochemical devices.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode material disposed on the positive electrode current collector.
  • the positive electrode sheet includes the positive electrode material described above in the present application.
  • the structure of the positive electrode sheet is known in the art as the structure of the positive electrode sheet that can be used in an electrochemical device.
  • the preparation method of the positive electrode sheet is known in the art and can be used for the preparation of the positive electrode sheet of the electrochemical device.
  • a positive electrode active material, a binder, and a conductive material and a thickener are added as required, and then the positive electrode slurry is dissolved or dispersed in a solvent.
  • the solvent is evaporated and removed during the drying process.
  • the solvent is known in the art and can be used as the positive electrode active material layer, such as but not limited to N-methylpyrrolidone (NMP).
  • NMP N-methylpyrrolidone
  • the electrochemical devices of the present application include a negative electrode sheet.
  • the negative electrode sheet is a negative electrode sheet known in the art that can be used in an electrochemical device.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector.
  • the anode active material layer includes an anode active material and an anode binder.
  • the negative electrode active material can be selected from various conventionally known materials that can be used as negative electrode active materials of electrochemical devices that can intercalate and deintercalate active ions or conventionally known materials capable of doping and dedoping active ions. substance.
  • the negative active material includes at least one of lithium metal, lithium metal alloy, transition metal oxide, carbon material, and silicon-based material.
  • the anode binder may include various polymeric binders.
  • the negative electrode active material layer further includes a negative electrode conductive agent.
  • the negative electrode conductive agent is used to provide conductivity for the negative electrode and can improve the conductivity of the negative electrode.
  • the negative electrode conductive agent is a conductive material known in the art that can be used as the negative electrode active material layer.
  • the negative electrode conductive agent may be selected from any conductive material as long as it does not cause chemical changes.
  • the structure of the negative electrode sheet is known in the art as the structure of the negative electrode sheet that can be used in an electrochemical device.
  • the preparation method of the negative electrode sheet is known in the art for the preparation method of the negative electrode sheet that can be used in an electrochemical device.
  • negative electrode active material and binder are usually added, and conductive material and thickener are added as required, and then dissolved or dispersed in a solvent to prepare negative electrode slurry.
  • the solvent is evaporated and removed during the drying process.
  • the solvent is known in the art and can be used as the negative electrode active material layer, and the solvent is, for example, but not limited to, water.
  • Thickeners are known in the art and can be used as a thickener for the negative active material layer, such as, but not limited to, sodium carboxymethylcellulose.
  • the electrochemical devices of the present application include a separator.
  • the separator is a separator known in the art that can be used in electrochemical devices, such as, but not limited to, a polyolefin-based porous membrane.
  • the polyolefin-based porous film comprises polyethylene (PE), ethylene-propylene copolymer, polypropylene (PP), ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-methyl methacrylate Monolayer or multilayer film composed of one or more of ester copolymers.
  • the present application has no particular limitations on the shape and thickness of the separator.
  • the preparation method of the separator is known in the art and can be used for the preparation of the separator of the electrochemical device.
  • the electrolyte includes an electrolyte salt.
  • Electrolyte salts are those known to those skilled in the art that are suitable for use in electrochemical devices. Appropriate electrolyte salts can be selected for different electrochemical devices. For example, for lithium ion batteries, lithium salts are generally used as electrolyte salts.
  • the electrolyte further includes an organic solvent.
  • the organic solvent is an organic solvent known to those skilled in the art and suitable for electrochemical devices, for example, a non-aqueous organic solvent is generally used.
  • the non-aqueous organic solvent includes at least one of carbonate-based solvents, carboxylate-based solvents, ether-based solvents, sulfone-based solvents, or other aprotic solvents.
  • the electrolyte further includes additives.
  • the additives are known in the art and are suitable for electrochemical devices, and can be added according to the required performance of the electrochemical device.
  • the additive comprises a carboxylate.
  • the carboxylate comprises at least one of pentasodium diethylenetriaminepentaacetate, sodium nitrilotriacetate, sodium edetate, and sodium gluconate.
  • the mass percentage of the carboxylate is 0.01%-0.15%.
  • the mass percentage of the carboxylate may be 0.02%, 0.03%, 0.05%, 0.07%, 0.09%, 0.10%, 0.11%, 0.12%, 0.13%.
  • the configuration of the electrolyte can be prepared by methods known to those skilled in the art, and its composition can be selected according to actual needs.
  • the lithium ion batteries of the examples and comparative examples were prepared according to the following methods.
  • the negative active material artificial graphite, binder styrene-butadiene rubber and sodium carboxymethyl cellulose are mixed in a weight ratio of 96:2:2 and dispersed in deionized water to form a slurry. After stirring evenly, it is coated on copper with a thickness of 6 ⁇ m.
  • the foil negative electrode current collector is dried to form a negative electrode active material layer, and is dried and cold pressed to obtain a negative electrode sheet.
  • a lithium cobalt oxide having a P6 3 mc crystal structure and a lithium manganese oxide having a C2/m crystal structure satisfying the compositional characteristics in Tables 1-4 were mixed as positive electrode materials. Then, the positive electrode material, conductive carbon black and binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone solvent system in a mass ratio of 98:1:1 to obtain a positive electrode slurry, which is coated with On the aluminum foil of 12 ⁇ m, it was dried and sliced to obtain a positive electrode sheet.
  • PVDF polyvinylidene fluoride
  • a polyethylene porous polymer film with a thickness of 8 ⁇ m was used as the separator.
  • the electrolytes used in Examples 4-1 to 4-7 and Comparative Example 4-1 were obtained by adding additives with corresponding contents on the basis of the above-mentioned basic electrolyte.
  • the positive electrode sheet, the separator film and the negative electrode sheet are stacked in sequence, so that the separator film is placed between the positive electrode sheet and the negative electrode sheet to play a role of isolation, and the electrode assembly is obtained by winding.
  • the electrode assembly is placed in the outer packaging aluminum-plastic film, and after dehydration at 80 °C, the above electrolyte is injected and packaged, and the lithium ion battery is obtained through the process of forming, degassing, and shaping.
  • First-round discharge capacity and cycle performance test At 25°C, the lithium-ion batteries prepared in the examples and comparative examples were charged with a constant current of 0.5C to a voltage of 4.8V, then left for 5 minutes, and then discharged with a constant current of 0.5C To the voltage of 3.0V, let stand for 5min, this is a cycle charge and discharge process, the discharge capacity this time is recorded as the first cycle discharge capacity.
  • the lithium-ion battery is subjected to N-cycle charge-discharge test according to the above method, and the discharge capacity of the N-cycle cycle is obtained by detection.
  • the capacity retention rate (%) of the lithium-ion battery after N cycles the discharge capacity of the Nth cycle/the discharge capacity of the first cycle ⁇ 100%.
  • Table 1 shows the effect of the composition of the cathode material and the peak intensity ratio on the performance of the lithium ion battery.
  • Table 2 shows the effect of the particle size relationship between lithium cobalt oxide with P6 3 mc crystal structure and lithium manganese oxide with C2/m crystal structure on the performance of lithium ion batteries.
  • Table 3 demonstrates the effect of the void/crack structure of LiCoO with P63mc crystal structure on the performance of Li-ion batteries.
  • Table 4 shows the effect of the content of carboxylate in the electrolyte on the performance of Li-ion batteries.
  • the positive electrode material has a sufficient amount of lithium manganese oxide to provide lithium ions for the lithium cobalt oxide having the P6 3 mc crystal structure, and supplement the formation of SEI On the other hand, it can avoid too much unstable C2/m crystal structure, thus greatly reducing the cycle stability of the cathode material.
  • the lithium cobalt oxide with the P6 3 mc crystal structure has both a hole and a crack structure.
  • it can promote the extraction of lithium ions inside the active material, thereby greatly improving the The first cycle discharge capacity of lithium-ion batteries;
  • the structure of pores and cracks can provide a buffer for stress and strain during cycling, improving the cycling stability of lithium-ion batteries.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
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Abstract

La présente demande concerne un matériau d'électrode positive, un procédé de préparation associé et un dispositif électrochimique. Le matériau d'électrode positive comprend de l'oxyde de cobalt et de lithium ayant une structure cristalline P63mc, et de l'oxyde de lithium-manganèse ayant une structure cristalline C2/m ; dans un diagramme XRD du matériau d'électrode positive, l'intensité pic à pic caractéristique située dans une plage de 17° à 19° est IA, et l'intensité pic à pic caractéristique située dans une plage de 19° à 22° est IB, où 0,1≤IB/IA≤0,5. Le dispositif électrochimique comprend une feuille d'électrode positive, une feuille d'électrode négative, un séparateur et un électrolyte, la feuille d'électrode positive comprenant le matériau d'électrode positive de la présente demande. Le matériau d'électrode positive présente une excellente stabilité structurelle, des caractéristiques de capacité élevées et une stabilité de cycle.
PCT/CN2021/105205 2020-12-23 2021-07-08 Matériau d'électrode positive, procédé de préparation associé et dispositif électrochimique WO2022134541A1 (fr)

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CN112670492B (zh) * 2020-12-23 2024-04-05 宁德新能源科技有限公司 正极材料及其制备方法以及电化学装置
CN115104204A (zh) * 2021-11-04 2022-09-23 宁德新能源科技有限公司 正极活性材料、正极极片、包含该正极极片的电化学装置和电子装置
CN114613938A (zh) * 2022-03-25 2022-06-10 珠海冠宇电池股份有限公司 一种正极片、电池、电子设备
CN116918106A (zh) * 2022-08-17 2023-10-20 宁德新能源科技有限公司 正极材料、电化学装置及电子设备
CN117747808A (zh) * 2022-09-13 2024-03-22 珠海冠宇电池股份有限公司 一种正极材料及包括该正极材料的正极片和电池
CN115763732A (zh) * 2022-11-15 2023-03-07 珠海冠宇电池股份有限公司 一种正极材料及包括该正极材料的正极片和电池

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