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WO2015051627A1 - Matériau d'électrode de nano-oxyde de fer en forme de tige, son procédé de préparation et son application - Google Patents

Matériau d'électrode de nano-oxyde de fer en forme de tige, son procédé de préparation et son application Download PDF

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WO2015051627A1
WO2015051627A1 PCT/CN2014/075130 CN2014075130W WO2015051627A1 WO 2015051627 A1 WO2015051627 A1 WO 2015051627A1 CN 2014075130 W CN2014075130 W CN 2014075130W WO 2015051627 A1 WO2015051627 A1 WO 2015051627A1
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iron oxide
rod
shaped nano
preparation
electrode material
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Chinese (zh)
Inventor
曾宏
武英
戚雯
况春江
周少雄
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Advanced Technology and Materials Co Ltd
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Advanced Technology and Materials 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
    • H01M4/36—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
    • H01M4/523—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron for non-aqueous cells
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide [Fe2O3]
    • 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
    • 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
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C01P2004/16—Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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

  • Rod-shaped nano-iron oxide electrode material preparation method and application thereof
  • the invention belongs to the technical field of preparation of electrode materials for lithium ion batteries, and particularly relates to a rod-shaped nano-iron oxide electrode material, a preparation method and application thereof, the rod-shaped nano-iron oxide has regular shape, uniform size, high purity, and can be used as positive and negative Electrode material. Background technique
  • lithium-ion battery As a new type of high-energy battery, lithium-ion battery has the advantages of high energy density, long service life, good cycle performance and no memory effect. It is widely used in mobile electronic products such as mobile phones, notebook computers, digital cameras and so on. In recent years, lithium-ion batteries have become one of the most valuable energy storage devices in the 21st century in the fields of electric vehicles, power tools, smart power grids, distributed energy systems, aerospace, and defense.
  • iron oxide nanomaterials Due to its high theoretical specific capacity, abundant reserves, easy preparation, non-toxicity, environmental friendliness and low cost, iron oxide nanomaterials have become a research hotspot in the field of lithium ion battery materials.
  • Common methods for synthesizing nano-iron oxides include mechanical ball milling, hydrothermal reaction, or synthesis of iron oxide nanomaterials by layer-by-layer self-assembly and subsequent heat treatment using FeOOH nanorods as precursors.
  • the mechanical ball milling method has the following drawbacks despite the simple method:
  • the obtained material has low purity, contains other impurities, and the prepared material is generally granular and the particle distribution is uneven.
  • a method for preparing nanometer iron oxide by using FeOOH nanorods as a precursor generally adding a base, It is polluted by the environment.
  • the obtained materials must be annealed at about 600 degrees, the process flow is long, the operation steps are cumbersome, the efficiency is low, and the energy consumption is high.
  • nano-iron oxide prepared by the above method is generally used as a negative electrode material for a lithium ion battery, and is basically not used as a positive electrode material, and a lithium salt such as lithium iron phosphate is usually used as a positive electrode material.
  • the main constituent materials of lithium-ion battery include electrolyte, isolation material, positive and negative materials, etc.
  • the positive electrode material occupies a large proportion (the mass ratio of positive and negative materials is 3:1 ⁇ 4:1), and the cost directly determines the battery cost. High and low. Therefore, the development of low-cost cathode materials is a market demand.
  • One of the objects of the present invention is to provide a method for preparing a rod-shaped nano-iron oxide electrode material in view of the defects existing in the prior art. This method is simple and easy.
  • Another object of the present invention is to provide a rod-shaped nano-iron oxide electrode material prepared by the above method and its use in a lithium ion battery.
  • the obtained rod-shaped nano-iron oxide not only has a relatively large specific surface area, a regular morphology, a uniform size, and good electrochemical performance.
  • a method for preparing a rod-shaped nanometer iron oxide electrode material wherein a hydrothermal reaction is carried out by using FeCl 3 «6H 2 0, ammonium dihydrogen phosphate (NH 4 H 2 P0 4 ) and water as raw materials, and the resulting precipitate is washed to obtain a rod shape.
  • Nano-iron oxide powder
  • FeCl 3 «6H 2 0 FeCl 3 +6H 2 0
  • the hydrothermal reaction temperature is 200-240 ° C, and the hydrothermal reaction time is 1-10 h.
  • the temperature of the hydrothermal reaction is 202 ° C, 210 ° C, 218 ° C, 225 ° C, 230 ° C, 235 ° C or 238.
  • hydrothermal reaction time is 1.5h, 2h, 2.5h, 3h, 4h, 5h, 6h, 7h, 8h, 8.5h or 9.5h. More preferably, the temperature of the hydrothermal reaction is 210-230 ° C, and the time of the hydrothermal reaction is 4-5 h.
  • the molar ratio of FeCl 3 «6H 2 0 to ammonium dihydrogen phosphate in the raw material is 26: 1-30: 1, exemplarily Can be 26.5: 1, 27: 1, 28: 1, 29: 1 or 29.5: 1.
  • the molar ratio of FeCl 3 *6H 2 0 to ammonium dihydrogen phosphate in the raw material is 27: 1-28: 1.
  • the precipitate is washed successively with deionized water and alcohol.
  • a rod-shaped nano-iron oxide electrode material prepared by the above method has a rod shape, an average diameter of 60-80 nm, a length of 250-300 nm, a purity of 99.9% or more, and a crystal phase of a-Fe 2 0 3 .
  • the above rod-shaped nano-iron oxide electrode material is used in a lithium ion battery, and the rod-shaped nano-iron oxide electrode material is used as an active material of a positive electrode or a negative electrode of a lithium ion battery.
  • the specific method of the application is as follows:
  • a binder and a conductive agent are added to the rod-shaped nano-iron oxide powder, thoroughly mixed by grinding, and then the mixed slurry is filtered to obtain a uniform pre-coated refining slurry;
  • the pre-coated refining slurry is applied to the surface current collector of the aluminum foil surface and the current collector of the copper foil, and dried to form a battery positive electrode sheet and a battery negative electrode sheet having an active material.
  • the mass percentage of the binder, the conductive agent and the rod-shaped nano iron oxide powder is: binder: 10-20%; conductive agent : 10-30%; rod-shaped nano iron oxide powder: 50-80%. More preferably, the binder: 10; a conductive agent: 20%; a rod-shaped nano iron oxide powder: 70%.
  • the grinding time is 40-60 min, and exemplarily, the grinding time is 42 min, 45 min, 50 min, 55 min. Or 58min.
  • the drying temperature is 100-120 ° C, and the drying time is 18-24 h.
  • the drying temperature is 105 ° C, 110. C, 102. C, 108. C or 120. C
  • drying time is 18.5h, 20h, 21h, 22h, 23h or 23.5h.
  • the binder and the conductive agent are reagents commonly used in the art.
  • the binder may be polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), sodium carboxymethyl cellulose (CMC) or polyolefin (PP, PE and other copolymers:
  • the conductive agent may be Carbon black super P, conductive graphite, ketjen black, carbon nanotubes or nano carbon fibers.
  • the present invention has the following beneficial effects:
  • the preparation method of the rod-shaped nano iron oxide powder of the invention is easy to obtain and non-toxic; the reactant can have a wide concentration range and is easy to control; the toxic substance is not used in the whole reaction, and the reaction does not need to add a surfactant, Catalyst, etc., no pollution to the environment; easy to separate products, few impurities, high purity; simple preparation process, convenient operation, easy to large-scale industrial production.
  • the rod-shaped nano-iron oxide powder obtained by the above method has uniform shape and uniform size, and has a rod shape, and the average diameter is about 60-80 nm, and the length is about 250-300 nm, and the purity of the material is high.
  • the above rod-shaped nano-iron oxide powder is used as a positive and negative electrode active material of a lithium ion battery, and has low cost, good electrochemical performance, good chemical stability of the electrode material, high specific capacity, and low polarization of the charge and discharge platform. It has been proved by experiments that the positive and negative electrodes made of the iron oxide nanorods have good charge and discharge cycles and can be used as electrode materials for lithium ion batteries. The iron oxide nanorod negative electrode materials are charged and discharged under the current of 100mAh/g for the first time.
  • the discharge capacity reaches 1030 mAh/g, the first charge capacity reaches 723 mAh/ g; the iron oxide nanorod positive electrode has a current discharge capacity of 222.4 mAh/g at a current of 20 mAh/g, and the first charge capacity is 175 mAh/g.
  • Figure 1 is a hydrothermal method for synthesizing iron oxide (Fe 2 O 3 ) nanorods (ie, rod-shaped nano-iron oxides, hereinafter referred to as iron oxide nanorods) by a hydrothermal reaction temperature (low-magnification SEM photograph), specifically hydrothermal reaction temperature Scanning electron micrograph (low-magnification SEM photograph) of iron oxide (Fe 2 O 3 ) nanorods prepared at 220 ° C (ie, Example 1); as can be seen from the above picture, the obtained nanomaterials are uniform in size and rod-shaped. The diameters are all about 60-80 nm, and the lengths are about 250-300 nm.
  • FIG. 2 is a topographical view (high-power SEM photograph) of a hydrothermally synthesized iron oxide (Fe 2 O 3 ) nanorod, specifically an iron oxide prepared by a hydrothermal reaction temperature of 220 ° C (ie, Example 1).
  • 2 0 3 Scanning electron micrograph of nanorods (high magnification SEM photograph).
  • the obtained nanomaterials are uniform in size and have a rod shape with a diameter of about 60-80 nm and a length of about 250-300 nm.
  • Figure 3 is a hydrothermal synthetic iron oxide (Fe 2 0 3) XRD pattern, particularly the hydrothermal reaction temperature is detected XRD pattern of synthetic iron oxide (Fe 2 0 3) when the 220 ° C (i.e. Example 1 embodiment), It is found from the figure that the diffraction peaks of the prepared nanomaterials are all XRD of Fe 2 0 3 nanorods. The XRD spectrum can confirm that the product is a-Fe 2 0 3 phase, and the characteristic peak is obvious.
  • FIG. 4 is a Raman spectrum of iron oxide nanorods, specifically a Raman spectrum of iron oxide (Fe 2 0 3 ) synthesized at a hydrothermal reaction temperature of 220 ° C (ie, Example 1), and the prepared nanomaterials are found from the map.
  • the diffraction peaks are all Raman peaks of Fe 2 0 3 nanorods.
  • the Raman structure of iron oxide nanorods is characterized by typical iron oxide. The product was confirmed to be Fe 2 0 3 by Raman spectrum.
  • Example 5 is a capacity-voltage curve of a button cell assembled with the iron oxide nanorods prepared in Example 1 as a negative electrode material. It can be seen from the figure that under the test condition of 0.1C, the iron oxide nanorod negative electrode has a first discharge capacity of 1030 mAh/ g in the voltage range of 0.01 to 3 V ; the first charge capacity reaches 723 mAh/g.
  • Example 6 is a capacity-cycle number and coulombic efficiency curve of a button cell assembled with the iron oxide nanorods prepared in Example 1 as a negative electrode material. As can be seen from the figure, except for the first to the 18th Coulomb efficiency In addition, the coulombic efficiency of other cycles is close to 100%.
  • Fig. 7 is a capacity-voltage curve of a button cell assembled by using iron oxide nanorods prepared in Example 1 as a positive electrode material. It can be seen from the figure that under the test condition of 0.1C, the iron oxide nanorod positive electrode has a first discharge capacity of 222.4 mAh/g in the voltage range of 1.5-4.5V, the first charging capacity is 175mAh/g, and the second discharge capacity is 144.4. mAh/g.
  • Fig. 8 is a capacity (coulombic efficiency) - cycle curve of a button cell assembled with the iron oxide nanorods prepared in Example 1 as a positive electrode material. As can be seen from the figure, in addition to the first to the 10th Coulomb efficiency, the Coulomb efficiency at other cycle times is close to 100%.
  • the obtained nanomaterials are uniform in size and rod-shaped, and the average diameters are all about 60-80 nm, and the lengths are about 250-300 nm. It can be confirmed from Fig. 3 and Fig. 4 that the product is an a-Fe 2 0 3 phase, and the characteristic peak is conspicuous.
  • the prepared rod-shaped nano-iron oxide powder, the binder polytetrafluoroethylene (PTFE) and the conductive agent carbon black Super P were uniformly mixed according to the mass ratio of 7: 1:2, ground for 45 minutes, and then filtered to obtain a uniform pre-preparation.
  • the anode electrode sheet of the electrode active material battery was obtained by holding at a temperature of 110 ° C for 24 h.
  • the slurry was directly applied to a copper foil surface current collector, and incubated at 110 ° C for 24 h in a vacuum oven to obtain an electrode active material battery negative electrode sheet.
  • the battery is subjected to constant current charge and discharge experiments.
  • the electrical performance test results are shown in Figure 5 and Figure 6.
  • the first discharge capacity reaches 1030 mAh/ g at a current density of 0.01 to 3 V and a current density of 100 mAh/ g; the first charge capacity is reached. At 723 mAh/g, it can still be maintained at 90 mAh/g after 100 cycles of charge and discharge.
  • the coulombic efficiency of other cycles is close to 100% except for the first to 18th coulombic efficiency.
  • the positive electrode sheet prepared in this embodiment the lithium sheet is a negative electrode sheet, and PE (polyethylene) is a separator.
  • the battery is subjected to constant current charge and discharge experiments.
  • the electrical performance test results are shown in Figure 7 and Figure 8.
  • the first discharge capacity reaches 222.4 mAh/g and the first charge capacity in the voltage range of 1.5-4.5V and 100mA/g current density. 175mAh/g, the second discharge capacity is 144.4mAh/g, and can still be maintained at HOmAh/g after 20 cycles of charge and discharge.
  • the coulombic efficiency is close to 100% except for the first to the 10th Coulomb efficiency. .
  • Example 2 Example 2
  • the molar ratio of ferric chloride to ammonium dihydrogen phosphate is 30:1 and deionized water (120g), all of which are placed in a hydrothermal reaction kettle. At 220 °C, the hydrothermal reaction time is 2 h. Then naturally cool to room temperature. The precipitate was washed three times with deionized water and twice with alcohol, and after separation, a rod-shaped nano-iron oxide powder was obtained, and the purity by HPLC was 99.9%.
  • the obtained nanomaterials are uniform in size and rod-shaped, with diameters of about 60-80. Around nanometer, the length is about 250-300 nanometers.
  • the product was confirmed to be a-Fe 2 0 3 phase by XRD analysis at 33 °, 35.7 °, 53.9. Significant a-Fe 2 0 3 characteristic peaks were observed at the position.
  • the battery was subjected to a constant current charge and discharge test.
  • the initial discharge capacity reached 1384 mAh/ g at a current density of 0.01 mA/ g at a current density of 0.01 mA/ g; the first charge capacity reached 773 mAh/g, and the charge and discharge cycle was still 100 times.
  • Maintained at 200 mAh/g the coulombic efficiency of the other cycles is close to 100%, except for the first to third coulombic efficiency.
  • the positive electrode sheet prepared in this embodiment the lithium sheet is a negative electrode sheet, and PE (polyethylene) is a separator.
  • the battery was subjected to a constant current charge and discharge test.
  • the initial discharge capacity reached 197 mAh/g at a current density of 1.5 mA/g at a current range of 1.5-4.5 V, and the first charge capacity was 169 mAh/g.
  • the obtained nanomaterials are uniform in size and rod-shaped, with diameters of about 60-80 nm and lengths of about 250-300 nm.
  • the product was confirmed to be a-Fe 2 0 3 phase by XRD analysis at 33.1 °, 35.6 °, 53.8. Significant a-Fe 2 0 3 characteristic peaks were observed at the position.
  • PE polyethylene
  • the first discharge capacity reached 1281mAh / g in the voltage range of 0.013V, 100mA / g current density ; the first charge capacity reached 781mAh / g, after the charge and discharge cycle 50 times can still maintain at 330mAh /g, except for the first to second coulombic efficiency, the coulombic efficiency of the other cycles is close to 100%.
  • the positive electrode sheet prepared in this embodiment the lithium sheet is a negative electrode sheet, and PE (polyethylene) is a separator.
  • the battery was subjected to constant current charge and discharge experiments.
  • the initial discharge capacity reached 183 mAh/g and the first charge capacity was 174 mAh/g in the voltage range of 1.5-4.5 V and 100 mA/g current density.
  • the obtained nanomaterials are uniform in size and rod-shaped, with diameters of about 60-80 nm and lengths of about 250-300 nm.
  • the product was confirmed to be a-Fe 2 0 3 phase by XRD analysis at 33 °, 35.7 °, 53.9. Significant a-Fe 2 0 3 characteristic peaks were observed at the position.
  • the battery was subjected to a constant current charge and discharge test.
  • the initial discharge capacity reached 1083 mAh/g at a current density of 0.01 mA/ g at a current density of 0.01 to 3 V.
  • the first charge capacity reached 730 mAh/g, and the charge and discharge cycle was still 50 times. Maintained at 260 mAh/g, the coulombic efficiency of the other cycles is close to 100%, except for the first to second coulombic efficiency.
  • the positive electrode sheet prepared in this embodiment the lithium sheet is a negative electrode sheet, and PE (polyethylene) is a separator.
  • the battery was subjected to a constant current charge-discharge test.
  • the initial discharge capacity reached 206 mAh/g at a current density of 1.5 mA/g at a current range of 1.5-4.5 V, and the first charge capacity was 181 mAh/g.
  • Maintained at 106 mAh/g, the coulombic efficiency at other cycle times is close to 100%, except for the first to second coulombic efficiency.

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Abstract

La présente invention concerne un matériau d'électrode de nano-oxyde de fer en forme de tige, et son procédé de préparation. Le procédé de préparation consiste à utiliser FeCl3·6H2O, un phosphate dihydrogène d'ammonium et de l'eau, pour obtenir une réaction hydrothermique, comme matériaux bruts, et laver les précipitats obtenus pour obtenir un nano-oxyde de fer en forme de tige. Le nano-oxyde de fer a la forme d'une tige et présente un diamètre moyen compris entre 60 et 80 nm, une longueur comprise entre 250 et 300 nm, une pureté de plus de 99,9 % et une phase cristalline α-Fe2O3. Le matériau d'électrode de nano-oxyde de fer en forme de tige peut être utilisé non seulement comme matériau actif d'électrode positive pour des batteries ion-lithium, mais également comme matériau actif d'électrode négative pour des batteries ion-lithium. Les matériaux bruts utilisés dans le procédé de préparation sont facilement disponibles, non toxiques et exempts de pollution environnementale; le procédé de préparation est simple et pratique à mettre en œuvre, et est approprié à une production industrielle à grande échelle. L'utilisation du matériau d'électrode de nano-oxyde de fer en forme de tige utilisé comme matériau actif d'électrode positive ou négative pour des batteries ion-lithium confère les avantages suivants : un faible coût, d'excellentes performances électrochimiques, une bonne stabilité chimique du matériau d'électrode, une haute capacité spécifique et une faible polarisation de la plate-forme charge et de décharge.
PCT/CN2014/075130 2013-10-12 2014-04-11 Matériau d'électrode de nano-oxyde de fer en forme de tige, son procédé de préparation et son application Ceased WO2015051627A1 (fr)

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CN201310476413.2A CN103606672A (zh) 2013-10-12 2013-10-12 棒状纳米氧化铁电极材料及其制备方法和应用

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CN103606672A (zh) * 2013-10-12 2014-02-26 安泰科技股份有限公司 棒状纳米氧化铁电极材料及其制备方法和应用
CN104815658B (zh) * 2015-04-09 2017-04-12 太原理工大学 二十四面体氧化铁纳米晶体催化剂、其制备方法及应用
WO2018184183A1 (fr) * 2017-04-07 2018-10-11 深圳市佩成科技有限责任公司 Procédé de fabrication d'électrode de batterie au lithium-ion et d'assemblage de batterie
CN106972152A (zh) * 2017-04-07 2017-07-21 深圳市佩成科技有限责任公司 锂离子电池电极制备及电池的组装方法
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