WO2011069348A1 - Matériau actif d'électrode positive au phosphate de fer et de lithium modifié au graphène, son procédé de préparation et batterie rechargeable lithium-ion comprenant ledit matériau - Google Patents

Matériau actif d'électrode positive au phosphate de fer et de lithium modifié au graphène, son procédé de préparation et batterie rechargeable lithium-ion comprenant ledit matériau Download PDF

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WO2011069348A1
WO2011069348A1 PCT/CN2010/070319 CN2010070319W WO2011069348A1 WO 2011069348 A1 WO2011069348 A1 WO 2011069348A1 CN 2010070319 W CN2010070319 W CN 2010070319W WO 2011069348 A1 WO2011069348 A1 WO 2011069348A1
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graphene
iron phosphate
lithium iron
lithium
active material
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Chinese (zh)
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刘兆平
周旭峰
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Ningbo Institute of Material Technology and Engineering of CAS
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Ningbo Institute of Material Technology and Engineering of CAS
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Priority to US13/515,179 priority Critical patent/US20120315550A1/en
Priority to KR1020127017947A priority patent/KR101681739B1/ko
Priority to EP10835385.5A priority patent/EP2511973A4/fr
Priority to JP2012542342A priority patent/JP2013513904A/ja
Priority to CA2786757A priority patent/CA2786757C/fr
Publication of WO2011069348A1 publication Critical patent/WO2011069348A1/fr
Anticipated expiration legal-status Critical
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    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/1393—Processes of manufacture of electrodes based on 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—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
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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 energy storage materials, and particularly relates to a novel graphene-modified lithium iron phosphate cathode active material with excellent rate performance and high cycle stability, and a high performance lithium ion secondary battery based on the material and the same Preparation. Background technique
  • Lithium-ion batteries have received special attention as new energy sources with strong competitive advantages.
  • Electrode materials are a key factor affecting the performance of lithium-ion batteries. The study found that lithium iron phosphate material has outstanding advantages in power lithium-ion batteries due to its high energy density and high safety performance, but its low conductivity limits the direct application of the material, requiring modification and doping. And other means to improve performance.
  • Graphene is a new material that has rapidly emerged in recent years. Its structure can be understood as a single layer of graphite, so it has extremely excellent electrical conductivity, and also has good conductivity for lithium ions. Graphene's unique two-dimensional nano-layered structure and its large specific surface area make it a more prominent advantage when it is added as a modified material compared to nanoparticles or nanowires. Therefore, graphene-modified lithium iron phosphate is expected to break through the traditional means such as carbon coating and conductive polymer doping to achieve a breakthrough in the performance of lithium-ion batteries.
  • a first technical problem to be solved by the present invention is to provide a graphene-modified lithium iron phosphate positive electrode active material.
  • a second technical problem to be solved by the present invention is to provide a method for preparing a graphene-modified lithium iron phosphate cathode active material.
  • a third technical problem to be solved by the present invention is to provide a high performance lithium ion secondary battery having a graphene-modified lithium iron phosphate positive active material.
  • the technical solution adopted by the present invention to solve the above first technical problem is a graphene-modified lithium iron phosphate positive electrode active material, characterized in that the positive electrode active material is a graphene modified modified lithium iron phosphate material, The mass ratio of graphene to lithium iron phosphate is 1/30 to 1/10.
  • the technical solution adopted by the present invention to solve the above second technical problem is a method for preparing a graphene-modified lithium iron phosphate cathode active material, which is characterized in that a certain ratio of graphene or graphene oxide and lithium iron phosphate is used.
  • the content of lithium iron phosphate in an aqueous solution is 2g / L ⁇ 50g / L, uniformly mixed by stirring and ultrasonic, stirring time is 0.5-2 hours, ultrasonic time is 0.5-2 hours, and then dried
  • the graphene or graphene oxide composite lithium iron phosphate material is finally subjected to high temperature annealing to finally obtain a graphene-modified lithium iron phosphate cathode active material, wherein the mass ratio of graphene to lithium iron phosphate is 1/30 to 1/10.
  • the mass ratio of graphene oxide to lithium iron phosphate is 1/15 to 1/5.
  • Ultrasound uses conventional ultrasonic mixing techniques.
  • the lithium iron phosphate material can be prepared by various methods such as a solid phase method and a liquid phase method (including hydrothermal method, sol-gel method, coprecipitation method, etc.);
  • Solid phase preparation The lithium, iron and phosphorus containing solid powder precursors are uniformly mixed in a stoichiometric ratio, and a solid lithium iron phosphate solid powder is obtained by solid phase reaction at a high temperature;
  • Liquid phase preparation Dissolving lithium-containing, iron-containing and phosphorus-containing inorganic precursors in a solvent, through a solution phase The reaction obtains lithium iron phosphate or lithium iron phosphate precursor, and the final lithium iron phosphate material is obtained by high temperature annealing.
  • the high temperature annealing temperature is between 400 and 700 ° C, and the annealing time is between 2 and 12 hours.
  • the drying means is one of spray drying, vacuum suction drying or direct heating drying, wherein after vacuum drying or direct heating drying, the product is pulverized by ball milling.
  • the technical solution adopted by the present invention to solve the above third technical problem is a lithium ion secondary battery comprising a positive electrode sheet, a negative electrode sheet, a separator between the positive electrode sheet and the negative electrode sheet, and a non-aqueous electrolyte, characterized in that
  • the positive electrode sheet is composed of a layer of a positive electrode active material coated on a positive electrode current collector, and the positive electrode active material is a graphene-modified lithium iron phosphate material, wherein a mass ratio of graphene to lithium iron phosphate is 1/30 ⁇ 1/10.
  • the production of lithium ion secondary batteries is carried out using a conventional process route.
  • the positive electrode is prepared by blending a positive electrode active material with a conductive agent and a binder in a solvent, uniformly mixing the solution, and applying it to a current collector, and drying to form a positive electrode sheet.
  • the positive electrode active material used herein is a graphene-modified lithium iron phosphate material.
  • the conductive agent may be a conductive carbon material such as conductive carbon black, Super P, and the current collector is aluminum foil.
  • the negative electrode is prepared by blending a negative electrode active material and a binder in a solvent, mixing uniformly, applying it on a current collector, and drying to form a negative electrode sheet.
  • the negative active material may be metallic lithium; a carbon material such as graphite, pyrolytic carbon, coke, carbon fiber or high-temperature sintered organic polymer compound; a material capable of forming an alloy with lithium, including a metal element such as Mg, B, Al , Ga, In, Si, Sn, Pb, Sb, Bi, Cd, Ag, Zn, Hf, Zr, Y, etc.), alloys containing Si and Sn (such as SiB 4 , SiB 6 , Mg 2 Si, Mg 2 Sn , Ni 2 Si, TiSi 2 , MoSi 2 , CoSi 2 , NiSi 2 , CaSi 2 , CrSi 2 , Cu 5 Si, FeSi 2 , MnSi 2 , NbSi 2 , TaSi
  • the separator is located between the positive electrode sheet and the negative electrode sheet and is a porous polymer film such as a microporous polypropylene film.
  • the nonaqueous electrolyte consists of a nonaqueous solvent and an electrolyte.
  • the nonaqueous solvent is dimethyl carbonate, dipropyl carbonate, propylene carbonate, ethylene carbonate, butylene carbonate, ⁇ butyrolactone, sulfolane, methyl sulfolane, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, methylpropionic acid, methylbutyric acid, acetonitrile, propionitrile, anisole, acetate, lactate, and propionate a mixture of one or several.
  • the electrolyte is a lithium-containing salt such as LiCl, LiBr, LiPF 6 , LiClO 4 , LiAsF 6 , LiBF 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 2 or LiB(C 6 H 5 ). 4 and so on.
  • a lithium-containing salt such as LiCl, LiBr, LiPF 6 , LiClO 4 , LiAsF 6 , LiBF 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 2 or LiB(C 6 H 5 ). 4 and so on.
  • Graphene is a new material that has rapidly emerged in recent years. Its structure can be understood as a single layer of graphite, so it has extremely excellent electrical conductivity, and also has good conductivity for lithium ions. Graphene's unique two-dimensional nano-layered structure and huge specific surface area make it comparable to nanometers. Particles or nanowires have more prominent advantages when added as modified materials. Therefore, graphene-modified lithium iron phosphate is expected to break through traditional methods such as carbon coating and conductive polymer doping to achieve a leap in lithium-ion battery performance. . The results show that the graphene-modified lithium iron phosphate cathode active material has excellent high rate charge and discharge performance and cycle stability.
  • the discharge capacity of the material at 10C rate is about 85% of the formation capacity, while the discharge capacity at 50C rate still reaches 70% of the formation capacity. After 1000 cycles of 50C charging 50C discharge under high current charge and discharge conditions, its capacity still showed no significant attenuation.
  • 1 is a scanning electron micrograph of a graphene-modified lithium iron phosphate positive active material
  • FIG. 2 is a scanning electron micrograph of graphene-modified lithium iron phosphate cathode active material at a high magnification
  • FIG. 3 is a charge-discharge curve of a lithium ion battery with graphene-modified lithium iron phosphate as a cathode material at different magnifications;
  • Fig. 4 is a cycle performance diagram of a lithium ion battery using graphene-modified lithium iron phosphate as a positive electrode material at a high rate of 50C. detailed description
  • the graphite was placed in a strong oxidizing agent and stirred under heating for 2 to 8 hours to obtain graphite oxide.
  • Graphene is obtained by reducing graphene oxide.
  • the strong oxidant may be a mixed system of potassium permanganate, concentrated sulfuric acid or potassium nitrate, or a mixed system of fuming nitric acid and sodium chlorate (or potassium chlorate), or fuming nitric acid, concentrated sulfuric acid and sodium chlorate (or potassium chlorate). Mixed system.
  • the reduction can be achieved by using a water-soluble strong reducing agent (such as hydrazine hydrate, sodium borohydride, etc.) in the aqueous phase, or by high temperature annealing.
  • the second step the preparation of lithium iron phosphate
  • Solid phase preparation The lithium, iron and phosphorus containing solid powder precursors are uniformly mixed in a stoichiometric ratio, and a solid lithium iron phosphate solid powder is obtained by solid phase reaction at a high temperature.
  • Preparation by liquid phase method Dissolving lithium-containing, iron-containing and phosphorus-containing inorganic precursors in a solvent, obtaining a lithium iron phosphate or lithium iron phosphate precursor by reaction of a solution phase, and then obtaining a final lithium iron phosphate material by high temperature annealing. .
  • the third step the preparation of graphene modified lithium iron phosphate
  • a graphene (graphene oxide) / lithium iron phosphate mixed dispersion system is prepared according to a certain ratio.
  • the two components are sufficiently uniformly mixed by means of stirring and ultrasonication.
  • a composite solid material of graphene (graphene oxide) and lithium iron phosphate is obtained.
  • a graphene-modified lithium iron phosphate powder material is obtained by annealing at 400-700 ° C.
  • the drying method may be one of ordinary heat drying, spray drying and vacuum suction drying.
  • the fourth step is the fabrication of a lithium ion secondary battery using graphene modified lithium iron phosphate as a positive electrode material.
  • the fabrication of lithium ion secondary batteries is carried out using a conventional process route.
  • the battery consists of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte.
  • the positive electrode is prepared by blending a positive electrode active material with a conductive agent and a binder in a solvent, uniformly mixing the solution, and applying it to a current collector, and drying to form a positive electrode sheet.
  • the positive electrode active material used herein is a graphene-modified lithium iron phosphate material.
  • the conductive agent may be a conductive carbon material such as conductive carbon black, Super P, and the current collector is aluminum foil.
  • the negative electrode is prepared by blending a negative electrode active material and a binder in a solvent, mixing uniformly, applying it on a current collector, and drying to form a negative electrode sheet.
  • the active material of the negative active material may be lithium metal; carbon materials such as graphite, pyrolytic carbon, coke, carbon fiber, and high-temperature sintered organic polymer compounds; materials capable of forming alloys with lithium, including metal elements (such as Mg, B) , Al, Ga, In, Si, Sn, Pb, Sb, Bi, Cd, Ag, Zn, Hf, Zr, or Y, etc., alloys containing Si and Sn (such as SiB 4 , SiB 6 , Mg 2 Si, Mg 2 Sn, Ni 2 Si, TiSi 2 , MoSi 2 , CoSi 2 , NiSi 2 , CaSi 2 , CrSi 2 , Cu 5 Si, FeSi 2 , MnSi 2 , NbSi 2 , TaS
  • the separator is located between the positive electrode sheet and the negative electrode sheet and is a porous polymer film such as a microporous polypropylene film.
  • the nonaqueous electrolyte consists of a nonaqueous solvent and an electrolyte.
  • the nonaqueous solvent is dimethyl carbonate, dipropyl carbonate, propylene carbonate, ethylene carbonate, butylene carbonate, ⁇ butyrolactone, sulfolane, methyl sulfolane, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, methylpropionic acid, methylbutyric acid, acetonitrile, propionitrile, anisole, acetate, lactate, and propionate a mixture of one or several.
  • the electrolyte is a lithium-containing salt such as LiCl, LiBr, LiPF 6 , LiClO 4 , LiAsF 6 , LiBF 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(CF 3 SO 2 ) 2 or LiB(C 6 H 5 ). 4 and so on.
  • the initial product was washed with water several times until the pH of the system reached about 5 to obtain a pure mother liquor of graphite oxide.
  • the oxidized graphite mother liquor was sonicated for 2 hours to obtain a single-layer exfoliated graphene oxide sol.
  • the second step according to the stoichiometric ratio, a certain amount of ferrous salt (such as ferrous sulfate, ferrous oxalate, or ferrous chloride), lithium-containing inorganic substances (such as lithium hydroxide, or lithium carbonate) And a phosphorus-containing inorganic substance (such as phosphoric acid, or ammonium dihydrogen phosphate, etc.) is dissolved in an aqueous solution at room temperature, and is configured as a precursor solution or a sol in the presence of a certain amount of an organic auxiliary agent such as ethylene glycol.
  • an organic auxiliary agent such as ethylene glycol
  • lithium iron phosphate is added to the aqueous graphene oxide solution, the lithium iron phosphate content is 5 mg/mL, and the mass ratio of lithium iron phosphate to graphene oxide is 15/1.
  • the mixed body was dried by a spray drying means to obtain a solid powder.
  • the powder was annealed under an argon atmosphere at 600 ° C for 5 hours to obtain a graphene-modified lithium iron phosphate cathode material.
  • the graphene-modified lithium iron phosphate cathode active material is uniformly mixed with the conductive agent Super P and the binder polyvinylidene fluoride in a ratio of mass ratio of 80:15:5 to the nitrogen methylpyrrolidone, and coated.
  • the cloth was placed on an aluminum foil and dried at 80 ° C to obtain a positive electrode sheet.
  • the lithium sheet is used as the negative electrode
  • the microporous polypropylene film is used as the separator
  • the 1 mol/L LiPF 4 non-aqueous solution (the solvent is an equal volume of a mixed solvent of dimethyl carbonate and dipropyl carbonate) is an electrolyte, and the positive electrode sheet is used.
  • a lithium ion secondary battery was prepared.
  • a ferrous salt such as ferrous oxalate
  • a lithium salt such as lithium chloride
  • a phosphorus source such as ammonium dihydrogen phosphate
  • an iron source such as ferrous oxalate, ferrous acetate, ferric oxide, or ferric nitrate
  • a phosphorus source such as lithium dihydrogen phosphate, ammonium dihydrogen phosphate, or diammonium hydrogen phosphate
  • Lithium source such as lithium dihydrogen phosphate, carbon Lithium acid, acetic acid, lithium nitrate, or lithium hydroxide, etc.
  • the product was subjected to high speed ball milling to obtain lithium iron phosphate powder.
  • the preparation method was basically the same as that of Example 1, except that the mass ratio of lithium iron phosphate to graphene oxide in the third step was 10/1.
  • Example 5
  • the preparation method was basically the same as that of Example 1, except that the mass ratio of lithium iron phosphate to graphene oxide in the third step was 5/1.
  • the preparation method is basically the same as that of the embodiment 1, except that the annealing temperature of the solid powder in the third step is
  • Example 8 Prepared substantially the same as Example 1, except that the annealing temperature of the third step in solid powder is 700 o C.
  • the preparation method is basically the same as that in the first embodiment, except that in the fourth step, graphite is used as the negative electrode active material, mixed with polyvinylidene fluoride, coated on copper foil, and dried at 80 ° C, thereby serving as a battery. Negative electrode sheet.
  • the second step is to use hydrazine hydrate as a reducing agent, water-soluble nonionic surfactant (such as polyoxyethylene lauryl ether, Tween 80, or Triton X100, etc., and its mass ratio to graphene oxide is 2/1) Reducing oxygen for stabilizers Graphene is obtained to obtain a graphene sol.
  • the mass ratio of the reducing agent to graphene oxide is 0.5:1 to 3: 1, and the reduction temperature is 70 to 90 °C.
  • the third step according to the stoichiometric ratio, a certain amount of ferrous salt (such as ferrous sulfate, ferrous oxalate, or ferrous chloride), lithium-containing inorganic substances (such as lithium hydroxide, or lithium carbonate) And a phosphorus-containing inorganic substance (such as phosphoric acid, or ammonium dihydrogen phosphate, etc.) is dissolved in an aqueous solution at room temperature, and is configured as a precursor solution or a sol in the presence of a certain amount of an organic auxiliary agent such as ethylene glycol.
  • an organic auxiliary agent such as ethylene glycol
  • lithium iron phosphate is added to the graphene aqueous solution, the lithium iron phosphate content is 5 mg/mL, and the mass ratio of lithium iron phosphate to graphene is 15/1.
  • the mixed system was dried by a spray drying means to obtain a solid powder. The powder was annealed under an argon atmosphere at 600 ° C for 5 hours to obtain a graphene-modified lithium iron phosphate cathode material.
  • the graphene-modified lithium iron phosphate cathode active material is uniformly mixed with the conductive agent Super P and the binder polyvinylidene fluoride in a ratio of mass ratio of 80:15:5 to the nitrogen methylpyrrolidone, and coated.
  • the cloth was placed on an aluminum foil and dried at 80 ° C to obtain a positive electrode sheet.
  • the lithium sheet is used as the negative electrode
  • the microporous polypropylene film is used as the separator
  • the 1 mol/L LiPF 4 non-aqueous solution (the solvent is an equal volume of a mixed solvent of dimethyl carbonate and dipropyl carbonate) is an electrolyte, and the positive electrode sheet is used.
  • a lithium ion secondary battery was prepared.
  • the first step and the second step are the same as the first step and the second step in the embodiment 9.
  • a ferrous salt such as ferrous oxalate
  • a lithium salt such as lithium chloride
  • a phosphorus source such as ammonium dihydrogen phosphate
  • the first step and the second step are the same as the first step and the second step in the embodiment 9.
  • the third step is to use an iron source (such as ferrous oxalate, ferrous acetate, ferric oxide, or ferric nitrate), a phosphorus source (such as lithium dihydrogen phosphate, ammonium dihydrogen phosphate, or diammonium hydrogen phosphate).
  • a lithium source such as lithium dihydrogen phosphate, lithium carbonate, lithium acetate, lithium nitrate, or lithium hydroxide
  • a reaction precursor powder is obtained by ball milling. Annealing at 400-700 ° C for 4-20 hours under argon protection, the product is subjected to high speed ball milling to obtain phosphorus Lithium iron phosphate powder.
  • the preparation method was basically the same as that of Example 9, except that the mass ratio of lithium iron phosphate to graphene oxide in the third step was 30/1.
  • the preparation method was basically the same as that of Example 9, except that the mass ratio of lithium iron phosphate to graphene oxide in the third step was 10/1.
  • the preparation method is basically the same as that of the embodiment 9, except that the annealing temperature of the solid powder in the third step is
  • the preparation method is basically the same as that of the embodiment 9, except that the annealing temperature of the solid powder in the third step is
  • the preparation method is basically the same as that of the embodiment 9, except that in the fourth step, graphite is used as the negative electrode active material, mixed with polyvinylidene fluoride, coated on the copper foil, and dried at 80 ° C, thereby serving as a battery. Negative electrode sheet.
  • graphite is used as the negative electrode active material, mixed with polyvinylidene fluoride, coated on the copper foil, and dried at 80 ° C, thereby serving as a battery.
  • Negative electrode sheet Example 17
  • the graphene oxide sol is spray-dried to obtain a graphene oxide solid powder, and the powder is annealed under an argon atmosphere at 1000 ° C for 30 seconds to obtain a reduced graphene powder.
  • the preparation method is basically the same as that of the embodiment 1, except that in the third step, the mixed system of graphene and lithium iron phosphate is obtained by heating at 80 ° C to obtain a dry mixed product, followed by ball milling and annealing to obtain graphene. Lithium iron phosphate cathode active material.
  • the preparation method is basically the same as that in Embodiment 1, except that in the third step, the mixture of graphene and lithium iron phosphate is removed by vacuum filtration, the residual moisture is dried at 80 ° C, and then graphene is obtained by ball milling and annealing. Modified lithium iron phosphate cathode active material.
  • the graphene-modified lithium iron phosphate cathode active material provided by the invention has obvious improvement in high rate charge and discharge and cycle stability compared with the conventional carbon-coated lithium iron phosphate material.
  • the lithium ion battery with graphene-modified lithium iron phosphate as the positive electrode active material described in the above embodiments can still maintain a capacity of 70% at a high charge-discharge rate of 50 C, and it is still not obvious after more than 1000 cycles. Attenuation.

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Abstract

Cette invention concerne un matériau actif d'électrode positive, son procédé de préparation et une batterie rechargeable lithium-ion comprenant ledit matériau. Le matériau actif d'électrode positive est le phosphate de fer et de lithium, ledit phosphate de fer et de lithium étant modifié au graphène. Le procédé de préparation consiste à disperser le phosphate de fer et de lithium et le graphène dans de l'eau, mélanger uniformément les deux matériaux précités aux ultrasons et par agitation, et sécher le mélange pour obtenir le composé à base de phosphate de fer et de lithium et de graphène ou d'oxyde de graphène avant de procéder à un recuit à haute température pour obtenir enfin le matériau actif d'électrode positive au phosphate de fer et de lithium modifié au graphène. La batterie rechargeable lithium-ion présente les avantages d'une capacité supérieure, d'une performance de cycle améliorée à la charge et à la décharge, d'une durée de vie prolongée, d'une stabilité de cycle supérieure à celle des batteries lithium-ion modifiées classiques telles que les batteries à revêtement en carbone, les batteries dopées au polymère de haut poids moléculaire etc.
PCT/CN2010/070319 2009-12-11 2010-01-22 Matériau actif d'électrode positive au phosphate de fer et de lithium modifié au graphène, son procédé de préparation et batterie rechargeable lithium-ion comprenant ledit matériau Ceased WO2011069348A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US13/515,179 US20120315550A1 (en) 2009-12-11 2010-01-22 Graphene-modified lithium iron phosphate positive electrode active material, preparation of the same and lithium-ion secondary cell
KR1020127017947A KR101681739B1 (ko) 2009-12-11 2010-01-22 그래핀 변성 인산철리튬 정극 활성물질과 그의 제조방법 및 리튬이온 이차전지
EP10835385.5A EP2511973A4 (fr) 2009-12-11 2010-01-22 Matériau actif d'électrode positive au phosphate de fer et de lithium modifié au graphène, son procédé de préparation et batterie rechargeable lithium-ion comprenant ledit matériau
JP2012542342A JP2013513904A (ja) 2009-12-11 2010-01-22 グラフェン改質リン酸鉄リチウム正極活物質及びその製造方法、及びリチウムイオン二次電池
CA2786757A CA2786757C (fr) 2009-12-11 2010-01-22 Materiau actif d'electrode positive au phosphate de fer et de lithium modifie au graphene, son procede de preparation et batterie rechargeable lithium-ion comprenant ledit materiau

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EP2511973A1 (fr) 2012-10-17
US20120315550A1 (en) 2012-12-13
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JP2013513904A (ja) 2013-04-22
KR20120109550A (ko) 2012-10-08
CN101752561B (zh) 2012-08-22
CN101752561A (zh) 2010-06-23
CA2786757C (fr) 2018-06-12
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