WO2023116020A1 - Matériau d'électrode négative, son procédé de préparation et son application - Google Patents

Matériau d'électrode négative, son procédé de préparation et son application Download PDF

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WO2023116020A1
WO2023116020A1 PCT/CN2022/115296 CN2022115296W WO2023116020A1 WO 2023116020 A1 WO2023116020 A1 WO 2023116020A1 CN 2022115296 W CN2022115296 W CN 2022115296W WO 2023116020 A1 WO2023116020 A1 WO 2023116020A1
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negative electrode
electrode material
silicon
present
preparation
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PCT/CN2022/115296
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Chinese (zh)
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余海军
陈江东
谢英豪
徐加雷
吴奔奔
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
湖南邦普汽车循环有限公司
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Publication of WO2023116020A1 publication Critical patent/WO2023116020A1/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
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M4/5805—Phosphides
    • 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
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M2004/027—Negative 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 invention belongs to the technical field of secondary batteries, and in particular relates to a negative electrode material and a preparation method and application thereof.
  • Lithium-ion battery is a secondary battery with the advantages of large capacity, light weight, and long life.
  • Materials that can be used for the negative electrode of lithium-ion batteries include lithium metal (Li), elemental silicon (Si), graphite, silicon carbon, tin selenide ( SnSex ), trimanganese tetraoxide (Mn 3 O 4 ), rhenium disulfide (ReS 2 ) etc.
  • Li lithium metal
  • Si elemental silicon
  • Si graphite
  • silicon carbon silicon
  • SnSex tin selenide
  • Mn 3 O 4 trimanganese tetraoxide
  • ReS 2 rhenium disulfide
  • graphite anode is the most mature anode commercially, which has excellent conductivity and good cycle stability, but its gram specific capacity (372mAh ⁇ g -1 ) is an obstacle to improve the energy density of lithium-ion batteries.
  • lithium metal anodes have the advantages of large theoretical capacity, low density, and
  • Silicon has the advantages of high theoretical capacity (4200mAh ⁇ g -1 ), abundant resources, and low price. It is expected to replace the current graphite anode for large-scale commercialization. However, the large volume change ( ⁇ 300%) of silicon materials during charge and discharge must be overcome before commercialization.
  • the present invention aims to solve at least one of the technical problems in the above-mentioned prior art. For this reason, the present invention proposes a negative electrode material, which can greatly improve the cycle stability of silicon-based negative electrodes through the design of structure and composition.
  • the present invention also proposes a preparation method of the above negative electrode material.
  • the present invention also proposes the application of the above-mentioned negative electrode material.
  • a negative electrode material including: a silicon-based core, a carbon-based layer wrapping the silicon-based core, and a metal phosphide wrapped on the surface of the carbon-based layer;
  • the carbon-based layer has a pore structure.
  • the negative electrode material provided by the present invention has a double-layer core-shell structure, and the outermost shell is a metal phosphide.
  • Li 3 P can be formed during the discharge process, which improves the storage capacity of Li+, that is, further improves The discharge capacity of the negative electrode material; at the same time, metal phosphide also has excellent electrical conductivity, so it can improve the rate performance of the negative electrode material;
  • the middle layer is a carbon-based layer, which can improve the electronic conductivity of the negative electrode material and improve its rate performance;
  • the core is silicon-based particles, which can take advantage of its unique high capacity density
  • the present invention can obtain negative electrode materials with high capacity and high electronic conductivity through structural design and synergy among components.
  • the present invention sets a carbon base layer with a pore structure between the outermost metal phosphide and the silicon-based core, wherein the pore structure can increase the specific surface area of the negative electrode material on the one hand, improve the ability to accommodate Li+, and provide it with a transmission channel , increase the diffusion rate of Li+, and further improve the rate performance of the above-mentioned negative electrode materials;
  • the carbon in the base layer and the silicon in the silicon base layer can form a Si-C strong chemical bond, promote the transfer of electrons, enhance the interaction between the silicon-based core and the carbon base layer, and avoid damage to the negative electrode material during cycling;
  • the present invention adopts carbon base layer and metal phosphide to double-layer wrap the silicon-based core, on the one hand, it can effectively suppress the damage caused by the volume expansion of the silicon-based core, on the other hand, even if part of the silicon-based material is damaged, it will not affect other negative electrode materials, It will not affect the normal work of other components such as electrolyte.
  • the present invention can significantly improve the cycle stability and rate performance of the anode material through structural design.
  • the negative electrode material of the present invention there is a synergy between the components and the structure, so after 800 cycles of the obtained negative electrode material with a current density of 4A/g, the reversible capacity is still as high as 1287.18mAh/g, and the capacity retention rate is ⁇ 71.8 %, with extremely high capacity density and cycle stability.
  • the metal phosphide includes at least one of iron phosphide, nickel phosphide, molybdenum phosphide and cobalt phosphide.
  • the electronic conductivity of the iron phosphide, nickel phosphide, molybdenum phosphide and cobalt phosphide are all excellent.
  • the particle size of the negative electrode material is 1-3 ⁇ m.
  • the specific surface area of the negative electrode material is 300-400 m 2 /g.
  • the carbon-based layer has a thickness of 0.4-0.8 ⁇ m.
  • gaps exist between the carbon-based layer and the metal phosphide.
  • the silicon-based core includes 200-500 nm nano-silicon.
  • the invention adopts the nano-scale silicon-based inner core, which can reduce the diffusion distance of Li+, improve the electronic conductivity, and alleviate the volume change in the charging and discharging process.
  • the carbon-based layer is doped with at least one of phosphorus and nitrogen.
  • Nitrogen and phosphorus can form Si-N bonds with the silicon-based core to enhance the force between the carbon-based layer and the silicon-based core;
  • Nitrogen doping promotes the transfer of electrons, and phosphorus is doped in the silicon-carbon material as an electron donor. After the combination of the two, the electronic structure in the silicon-carbon material can be adjusted, thereby improving its electronic conductivity.
  • a method for preparing the negative electrode material comprising the steps of:
  • the ligands include phosphorus-containing ligands
  • reaction mechanism of described preparation method is as follows:
  • step S1 a solvothermal method is used to in-situ synthesize a layer of phosphorus-containing MOF material on the surface of silicon-based particles;
  • step S2 the solid obtained in step S1 is calcined.
  • the MOF material is used as a template to form a carbon-based layer with a pore structure; the metal ions and phosphorus in the MOF material form a metal phosphide during the calcination process, and the metal phosphide tends to concentrate on the surface of the carbon-based layer, forming the outermost shell of the negative electrode material.
  • the present invention innovatively proposes and implements the use of phosphorus in MOF materials as a phosphorus source for the synthesis of metal phosphides, so there is no need to add phosphorus sources again in the subsequent preparation process, which not only saves the process, but also avoids additional additions
  • the problem of uneven distribution caused by the phosphorus source the uniformity of the distribution of the metal phosphide on the surface of the negative electrode material is improved.
  • the present invention adopts MOF material as the precursor of the carbon base layer.
  • the MOF material has a large specific surface area, porous structure and inherent carbon skeleton.
  • the carbon base layer generated by carbonization will inherit the advantages of the MOF material and improve the negative electrode material. electrochemical performance;
  • the MOF material will shrink to a certain extent during the calcination process, in the obtained negative electrode material, a certain gap will be generated between the metal phosphide and the carbon-based layer, that is, a hollow structure, which further increases the strength of the obtained negative electrode material.
  • the specific surface area can effectively alleviate the volume change during charging and discharging, fully expose the active sites and shorten the ion diffusion distance.
  • the preparation method of the present invention combines the advantages of MOF materials, silicon-based particles and metal phosphides, while avoiding their respective original shortcomings, and obtains negative electrode materials with excellent comprehensive performance.
  • the preparation method provided by the invention has simple operation, mild reaction conditions, no pollution to the environment, and is suitable for industrial production.
  • the silicon-based particles are nano-silicon. In some embodiments of the present invention, in step S1, the particle diameter of the silicon-based particles is 200-500 nm.
  • step S1 the silicon-based particles are added in an amount of 1-2 g.
  • step S1 the molar ratio of the metal salt to the silicon-based particles is about 1:(3-6).
  • the metal salt includes at least one of nickel salt, cobalt salt, molybdenum salt and iron salt.
  • the anion of the metal salt includes at least one of chloride ion, sulfate ion and nitrate ion.
  • the phosphorus-containing ligand includes at least one of hydroxyethylidene diphosphonic acid and glyphosate.
  • the ligands further include nitrogen-containing ligands.
  • the nitrogen-containing ligand includes at least one of pyrazine, bipyridine (bpy) and phenanthroline (Phen).
  • step S1 the molar ratio of the metal salt to the phosphorus-containing ligand is 1: (1-2).
  • the molar ratio of the metal salt, phosphorus-containing ligand and nitrogen-containing ligand is 1:(1-2):(1-2).
  • step S1 the molar ratio of the metal salt to the ligand is 1:(1-4).
  • step S1 the molar ratio of the metal salt to the ligand is 1:(2-4).
  • the solvent used in the solvothermal reaction includes at least one of N,N-dimethylformamide (DMF), methanol and ethanol.
  • step S1 in the solvothermal reaction, the ratio of the volume of the solvent to the mass of the silicon-based particles is 2-3 mL:0.1 g.
  • step S1 the temperature of the solvothermal reaction is 100-150°C.
  • step S1 the duration of the solvothermal reaction is 10-16 hours.
  • step S1 further includes dispersing the silicon-based particles, metal salt and ligand in the solvent before the solvothermal reaction.
  • the dispersing includes stirring the metal salt and the ligand and the solvent first, and then adding the silicon-based particles and ultrasonicating.
  • the duration of the stirring is 30-60 minutes.
  • the power of the ultrasound is 60-90%.
  • the 100% power of the ultrasound is 150W.
  • the duration of the ultrasound is 30-60 minutes.
  • step S1 further includes washing and drying the obtained solid after the solid-liquid separation.
  • the cleaning includes sequentially washing with water and 30-99.5 wt% ethanol solution.
  • solid-liquid separation is required after the washing.
  • step S1 centrifugation may be used for all solid-liquid separation steps.
  • the rotational speed of the centrifugation method is 8000-10000 rpm.
  • the drying temperature is 50-70°C.
  • the drying temperature is about 60°C.
  • the drying time is 10-18 hours.
  • the drying time is about 12 hours.
  • the drying method is vacuum drying.
  • the protective atmosphere includes at least one of nitrogen and inert gas.
  • step S2 the constant temperature of the calcination is 450-550°C.
  • step S2 the constant temperature of the calcination is 4-6 hours.
  • step S2 the heating rate of the calcination is 2-7° C./min.
  • step S2 also includes washing after the calcination.
  • the washing after calcination includes at least one of washing with water and washing with ethanol.
  • a negative electrode is proposed, and the raw material for preparation includes the negative electrode material or the negative electrode material obtained by the preparation method.
  • the invention synthesizes a metal phosphide-coated silicon carbon core-shell negative electrode material through a simple method, introduces highly stable N and C sources, and forms a high-performance composite negative electrode material.
  • the volume expansion can be effectively suppressed, thereby improving the battery life of the silicon anode for lithium-ion batteries, while having high capacity and high rate performance.
  • the preparation method of the negative electrode includes the following steps:
  • step D2 mixing and homogenizing the mixture obtained in step D1 with the diluent;
  • step D2 Coating the slurry obtained in step D2 on the current collector, drying and rolling.
  • the conductive agent in step D1, includes at least one of acetylene black and graphene.
  • the binder in step D1, includes at least one of styrene-butadiene rubber (SBR), sodium carboxymethylcellulose (CMC) and polyvinylidene fluoride (PVDF).
  • SBR styrene-butadiene rubber
  • CMC sodium carboxymethylcellulose
  • PVDF polyvinylidene fluoride
  • the binder in step D1, is a mixture of styrene-butadiene rubber (SBR) and sodium carboxymethylcellulose (CMC).
  • SBR styrene-butadiene rubber
  • CMC sodium carboxymethylcellulose
  • step D1 the mixing method is dry mixing and stirring.
  • the silicon carbon material accounts for 70-80%; the conductive agent accounts for 10-20%; the binder accounts for 10-20% ;
  • the binder includes 5-10% of CMC and 5-10% of SBR.
  • the diluent in step D2, includes water or N,N-dimethyldiamide.
  • step D2 the solid content of the slurry is 40-60 wt%.
  • step D2 the viscosity of the slurry is 4500-6000 cps.
  • the current collector includes copper foil.
  • a secondary battery including the negative electrode.
  • Fig. 1 is the schematic flow chart of embodiment 1 of the present invention.
  • Fig. 2 is the cycle performance of the battery obtained by the application example of the present invention.
  • Fig. 3 is the adsorption-desorption isotherm of embodiment 1 gained negative electrode material
  • Example 4 is a SEM image of the negative electrode material obtained in Example 1.
  • the operating temperature in the specific examples is about 25°C;
  • Metal salts, hydroxyethylidene diphosphonic acid and pyrazine were purchased from Shanghai McLean Biochemical Technology Co., Ltd.;
  • Nano-silicon was purchased from Guangdong Bangpu Cycle Technology Co., Ltd., and the particle size was dispersed between 200-500nm;
  • DMF and hydrochloric acid were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 90%, and ultrasonically disperse for 30 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 100° C. for 15 hours;
  • step S1d Cool the mixture obtained in step S1c, centrifuge at a rotational speed of 8000 rpm, wash the obtained solid with distilled water and ethanol solution, and dry at 70° C. for 10 h to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 550°C for 4 hours at a constant temperature and calcinate it at a constant temperature of 7°C/min. After cooling with the furnace, wash the obtained product with distilled water until it is neutral. Filter and dry the solid at 70°C for 6h.
  • FIG. 1 The flow diagram of this embodiment is shown in FIG. 1 .
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1.5 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 70%, and ultrasonically disperse for 60 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 150° C. for 10 h;
  • step S1d Cool the mixture obtained in step S1c, and centrifuge at 10000 rpm, wash the obtained solid with distilled water and ethanol solution several times, and dry at 60° C. for 12 hours to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 450°C for 6 hours at a constant temperature in an N 2 atmosphere. The heating rate is 2°C/min. After cooling with the furnace, the obtained product is washed with distilled water until it is neutral, filtered, and solidified. Dry at 70°C for 6h.
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 90%, and ultrasonically disperse for 30 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 100° C. for 15 hours;
  • step S1d Cool the mixture obtained in step S1c, centrifuge at a rotation speed of 8000 rpm, wash the obtained solid with distilled water and ethanol solution several times, and dry at 70°C for 10 hours to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 550°C for 4 hours at a constant temperature of 550°C for 4 hours in an atmosphere of N 2 . Cool with the furnace, wash the resulting product with distilled water until it is neutral, and filter it. Dry at 70°C for 6h.
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1.5 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 70%, and ultrasonically disperse for 60 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 150° C. for 10 h;
  • step S1d Cool the mixture obtained in step S1c, centrifuge at a rotational speed of 10,000 rpm, wash the obtained solid with distilled water and ethanol solution several times, and dry at 60° C. for 12 hours to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 450°C for 6 hours at a constant temperature under N2 atmosphere. The heating rate is 2°C/min. Cool with the furnace, wash the obtained product with distilled water until it is neutral, and filter it. Dry at 70°C for 6h.
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 90%, and ultrasonically disperse for 30 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 100° C. for 15 hours;
  • step S1d Cool the mixture obtained in step S1c, centrifuge at a rotational speed of 8000 rpm, wash the obtained solid with distilled water and ethanol solution several times, and dry at 70° C. for 10 hours to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 550°C for 4 hours at a constant temperature under N2 atmosphere, and calcine at a constant temperature of 7°C/min. Cool with the furnace, wash the obtained product with distilled water until it is neutral, filter, and The solid was dried at 70°C for 6h.
  • a negative electrode material is prepared, and the specific process is as follows:
  • step S1b Add 1.5 g of nano-silicon to the mixture obtained in step S1a, set the ultrasonic power to 70%, and ultrasonically disperse for 60 minutes;
  • step S1c Move the mixture obtained in step S1b into a reactor, and react at 150° C. for 10 h;
  • step S1d Cool the mixture obtained in step S1c, centrifuge at a rotational speed of 10,000 rpm, wash the obtained solid with distilled water and ethanol solution several times, and dry at 60° C. for 12 hours to obtain a precursor;
  • step S2 Use a tube furnace to heat the precursor obtained in step S1 to 450°C for 6 hours at a constant temperature under N 2 atmosphere. The heating rate is 2°C/min. After cooling with the furnace, wash the obtained product with distilled water until neutral, and filter , Dry the solid at 70°C for 6h.
  • This comparative example has prepared a kind of negative electrode material, and the difference with embodiment 4 is:
  • the ligand in step S1a does not include hydroxyethylidene diphosphonic acid, but only includes 0.02mol of pyrazine;
  • step S1a The metal salt in step S1a is ferrous chloride, not nickel chloride.
  • the nano-silicon used in Examples 1-6 and the obtained negative electrode material were respectively used as the negative electrode active material to prepare the negative electrode sheet.
  • the specific method is as follows:
  • step D2 Dispersing the mixture obtained in step D1 into water to form a slurry with a solid content of 50wt% and a viscosity of 4500-6000cps;
  • step D3 Coat the slurry obtained in step D2 on the current collector, dry it, and roll it to obtain a coating thickness of 90-140 ⁇ m (thickness at different positions fluctuates within the above range), and a compacted density of 1.70-1.90 g/cm 3 (The compaction at different positions fluctuates within the above range).
  • test battery is a button battery formed by the negative electrode obtained in the application example and a lithium sheet
  • test voltage is 0.02-1.2V
  • test current is 4A/g
  • test results are shown in Figure 2.
  • Example 1 the physical and chemical properties of the negative electrode material obtained in Example 1 were also tested, specifically the specific surface area and microscopic morphology of the negative electrode material.
  • Figure 3 is the adsorption-desorption isotherm of the negative electrode material obtained in Example 1.
  • the test method is as follows: the powder sample to be tested is placed in a U-shaped sample tube, and the mixed gas containing a certain proportion of adsorbate flows through the sample. The gas concentration change is used to determine the adsorption amount (BET) of the sample to be tested for the adsorbate molecule (N 2 ).
  • BET adsorption amount
  • the results in Figure 3 show that the sample has a typical H3 hysteresis loop, indicating that it is a mesoporous material, and has a high adsorption and desorption capacity when P/P0 ⁇ 0.02, indicating that it has a more microporous structure, that is
  • the material is a porous material which is mainly microporous and mesoporous.
  • the specific surface area of the negative electrode material obtained in the present invention is 300-400 m 2 /g.
  • the negative electrode material obtained by the invention is spherical, and the main particle size distribution is between 1 and 3 ⁇ m.
  • the specific morphology is shown in Figure 4.
  • the outer layer of each sphere is brighter. According to the mass-thickness contrast, the sphere (negative electrode material) has a core-shell structure, but the outermost shell structure is very thin.

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Abstract

La présente invention divulgue un matériau d'électrode négative, son procédé de préparation et son application. Le matériau d'électrode négative comprend un noyau à base de silicium, une couche à base de carbone enroulée sur la surface du noyau à base de silicium, et un phosphure métallique enroulé sur la surface de la couche à base de carbone, la couche à base de carbone ayant une structure de pores. Le matériau d'électrode négative de la présente invention peut améliorer considérablement la stabilité de cyclage d'une électrode négative à base de silicium au moyen de la conception de la structure et des composants. La présente invention concerne également un procédé de préparation et une application du matériau d'électrode négative décrit.
PCT/CN2022/115296 2021-12-21 2022-08-26 Matériau d'électrode négative, son procédé de préparation et son application WO2023116020A1 (fr)

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CN202111572556.4A CN114373909A (zh) 2021-12-21 2021-12-21 一种负极材料及其制备方法和应用

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