WO2013111379A1 - リチウムイオン電池用正極活物質、リチウムイオン電池用正極、及び、リチウムイオン電池 - Google Patents

リチウムイオン電池用正極活物質、リチウムイオン電池用正極、及び、リチウムイオン電池 Download PDF

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WO2013111379A1
WO2013111379A1 PCT/JP2012/074266 JP2012074266W WO2013111379A1 WO 2013111379 A1 WO2013111379 A1 WO 2013111379A1 JP 2012074266 W JP2012074266 W JP 2012074266W WO 2013111379 A1 WO2013111379 A1 WO 2013111379A1
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lithium ion
ion battery
positive electrode
active material
electrode active
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French (fr)
Japanese (ja)
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健太郎 岡本
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JX Nippon Mining and Metals Corp
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JX Nippon Mining and Metals Corp
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Priority to CN201280067878.6A priority Critical patent/CN104067424B/zh
Priority to KR1020147014824A priority patent/KR101616215B1/ko
Priority to US14/364,809 priority patent/US9224515B2/en
Publication of WO2013111379A1 publication Critical patent/WO2013111379A1/ja
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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
    • H01M4/50—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
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
    • H01B1/08—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances oxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G45/00—Compounds of manganese
    • C01G45/12—Complex oxides containing manganese and at least one other metal element
    • C01G45/1221—Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof
    • C01G45/1228—Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/40—Complex oxides containing cobalt and at least one other metal element
    • C01G51/42—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2
    • C01G51/44—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2 containing manganese
    • C01G51/50—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2 containing manganese of the type (MnO2)n-, e.g. Li(CoxMn1-x)O2 or Li(MyCoxMn1-x-y)O2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G53/00—Compounds of nickel
    • C01G53/40—Complex oxides containing nickel and at least one other metal element
    • C01G53/42—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G53/00—Compounds of nickel
    • C01G53/40—Complex oxides containing nickel and at least one other metal element
    • C01G53/42—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2
    • C01G53/44—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese
    • C01G53/50—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2
    • 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
    • H01M4/13—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
    • H01M4/36—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
    • 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
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C01P2002/52—Solid solutions containing elements as dopants
    • 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
    • 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
    • C01P2006/80—Compositional purity
    • C01P2006/82—Compositional purity water content
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a positive electrode active material for a lithium ion battery, a positive electrode for a lithium ion battery, and a lithium ion battery.
  • Lithium-containing transition metal oxides are generally used as positive electrode active materials for lithium ion batteries. Specifically, lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 O 4 ), etc., improved characteristics (higher capacity, cycle characteristics, storage characteristics, reduced internal resistance) In order to improve the rate characteristics and safety, it is underway to combine them. Lithium ion batteries for large-scale applications such as in-vehicle use and load leveling are required to have different characteristics from those of conventional mobile phones and personal computers.
  • Patent Document 1 discloses: Li x Ni 1- y My O 2- ⁇ (0.8 ⁇ x ⁇ 1.3, 0 ⁇ y ⁇ 0.5, and M is Co, Mn, Fe, Cr, V, Ti, Cu, Al, Ga, Bi, Sn, Zn, Mg, It represents at least one element selected from the group consisting of Ge, Nb, Ta, Be, B, Ca, Sc and Zr, ⁇ corresponds to oxygen deficiency or oxygen excess, ⁇ 0.1 ⁇ ⁇ 0.1
  • a method for producing a positive electrode material for a lithium secondary battery characterized in that small substances are blended at a weight ratio of 0: 100 to 100: 0. And according to this, it is described that the positive electrode material for lithium secondary batteries with various balance of rate characteristics and capacity can be easily manufactured.
  • Patent Document 1 Although the lithium nickel composite oxide described in Patent Document 1 has an excessive amount of oxygen in its composition formula, there is still room for improvement as a high-quality positive electrode active material for lithium ion batteries.
  • an object of the present invention is to provide a positive electrode active material for a lithium ion battery having good battery characteristics.
  • the present inventor has found that there is a close correlation between the amount of oxygen of the positive electrode active material and the battery characteristics. That is, it has been found that good battery characteristics can be obtained when the amount of oxygen in the positive electrode active material is greater than or equal to a certain value. Further, it has been found that there is a close correlation between the moisture content of the positive electrode active material, and further, the moisture absorption amount and the battery characteristics. That is, it has been found that particularly good battery characteristics can be obtained when the water content of the positive electrode active material is below a certain value, and further when the moisture absorption amount of the positive electrode active material is below a certain value.
  • Composition formula Li (Li x Ni 1- xy M y) O 2 + ⁇
  • M is one or more selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr. Yes, 0 ⁇ x ⁇ 0.1, 0 ⁇ y ⁇ 0.7, and ⁇ > 0.
  • a water content measured by Karl Fischer titration at 300 ° C. is 1100 ppm or less.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 800 ppm or less measured at 300 ° C. by Karl Fischer titration.
  • the positive electrode active material for a lithium ion battery according to the present invention is at least one selected from Mn and Co.
  • the positive electrode active material for a lithium ion battery according to the present invention has ⁇ > 0.05 in the composition formula.
  • the positive electrode active material for a lithium ion battery according to the present invention is ⁇ > 0.1 in the composition formula.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content measured by Karl Fischer titration at 150 ° C. of 300 ppm or less.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 200 ppm or less measured at 150 ° C. by Karl Fischer titration.
  • the positive electrode active material for a lithium ion battery according to the present invention has a difference between the water content measured by Karl Fischer titration at 300 ° C. and the water content measured by Karl Fischer titration at 150 ° C. is 100. ⁇ 500 ppm.
  • the positive electrode active material for a lithium ion battery according to the present invention has a difference between the water content measured by Karl Fischer titration at 300 ° C. and the water content measured by Karl Fischer titration at 150 ° C. is 100. ⁇ 130 ppm.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 1500 ppm or less measured by Karl Fischer titration at 150 ° C. after being left in an atmosphere of 50% humidity and 25 ° C. for 24 hours. It is.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 1200 ppm or less measured by Karl Fischer titration at 150 ° C. after being left in an atmosphere of 50% humidity and 25 ° C. for 24 hours. It is.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 300 ppm or less as measured by Karl Fischer titration at 150 ° C. after standing at a dew point of ⁇ 80 ° C. for 24 hours.
  • the positive electrode active material for a lithium ion battery according to the present invention has a water content of 200 ppm or less as measured by Karl Fischer titration at 150 ° C. after standing at a dew point of ⁇ 80 ° C. for 24 hours.
  • the present invention is a positive electrode for a lithium ion battery using the positive electrode active material for a lithium ion battery according to the present invention.
  • the present invention is a lithium ion battery using the positive electrode for a lithium ion battery according to the present invention.
  • a positive electrode active material for a lithium ion battery having good battery characteristics can be provided.
  • lithium cobaltate LiCoO 2
  • lithium-containing transition metal oxides such as lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 O 4 ).
  • the positive electrode active material for a lithium ion battery of the present invention produced using such a material is Composition formula: Li (Li x Ni 1- xy M y) O 2 + ⁇
  • M is one or more selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr. Yes, 0 ⁇ x ⁇ 0.1, 0 ⁇ y ⁇ 0.7, and ⁇ > 0.
  • M is one or more selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr. Yes, 0 ⁇ x ⁇ 0.1, 0 ⁇ y ⁇ 0.7, and ⁇ > 0.
  • oxygen is expressed as O 2 + ⁇ ( ⁇ > 0) as described above in the composition formula, and is excessively contained. Battery characteristics such as rate characteristics and capacity retention are improved.
  • ⁇ is preferably ⁇ > 0.05, and more preferably ⁇ > 0.1.
  • the positive electrode active material for lithium ion batteries of the present invention has a water content of 1100 ppm or less measured at 300 ° C. by Karl Fischer titration (JIS K0113 potential difference / current / electricity / Karl Fischer titration general rules). It is a substance.
  • the Karl Fischer method is a method for measuring moisture using a Karl Fischer reagent (configured by a solvent such as iodine, sulfur dioxide, base, and alcohol) that selectively and quantitatively reacts with water as shown in the following formula. It is.
  • the positive electrode active material for a lithium ion battery contains a water content exceeding a predetermined amount, the battery characteristics of a lithium ion battery using the positive electrode active material will be poor. If the water content measured by Karl Fischer titration at 300 ° C. is 1100 ppm or less as in the positive electrode active material for a lithium ion battery of the present invention, the cycle characteristics, high temperature operation and storage characteristics of the lithium ion battery using the same Battery characteristics are improved.
  • the water content measured by Karl Fischer titration at 300 ° C. is preferably 800 ppm or less, more preferably 300 ppm or less.
  • the positive electrode active material for a lithium ion battery of the present invention preferably further has a water content of 300 ppm or less as measured by Karl Fischer titration at 150 ° C. If the water content measured by Karl Fischer titration at 150 ° C. is 300 ppm or less, the battery characteristics such as cycle characteristics, high-temperature operation and storage characteristics of a lithium ion battery using the same will be further improved.
  • the water content measured by Karl Fischer titration at 150 ° C. is preferably 200 ppm or less, more preferably 120 ppm or less.
  • the positive electrode active material for a lithium ion battery of the present invention preferably has a difference between the water content measured by Karl Fischer titration at 300 ° C. and the water content measured by Karl Fischer titration at 150 ° C. of 100 to 500 ppm. . If the difference in water content is 100 to 500 ppm, the cycle characteristics of a lithium ion battery using the positive electrode active material will be good. Further, the difference between the water content measured by Karl Fischer titration at 300 ° C. and the water content measured by Karl Fischer titration at 150 ° C. is more preferably 100 to 170 ppm, and still more preferably 100 to 130 ppm. is there.
  • the positive electrode active material for a lithium ion battery of the present invention preferably has a water content of 1500 ppm or less measured by Karl Fischer titration at 150 ° C. after being left in an atmosphere of 50% humidity and 25 ° C. for 24 hours.
  • the moisture content measured by Karl Fischer titration at 150 ° C. after being left in an atmosphere of 50% humidity and 25 ° C. for 24 hours is more preferably 1200 ppm or less, and even more preferably 700 ppm or less.
  • the positive electrode active material for a lithium ion battery of the present invention preferably has a water content of 300 ppm or less measured by Karl Fischer titration at 150 ° C. after standing at a dew point of ⁇ 80 ° C. for 24 hours.
  • the reason for measuring at a dew point of ⁇ 80 ° C. is to avoid being affected by the amount of water in the measurement environment.
  • the moisture content measured by Karl Fischer titration at 150 ° C. after standing for 24 hours at a dew point of ⁇ 80 ° C. is more preferably 200 ppm or less, and still more preferably 120 ppm or less.
  • the positive electrode active material for a lithium ion battery is composed of primary particles, secondary particles formed by aggregation of primary particles, or a mixture of primary particles and secondary particles.
  • the positive electrode active material for a lithium ion battery preferably has an average particle diameter of primary particles or secondary particles of 2 to 15 ⁇ m. When the average particle size is less than 2 ⁇ m, it becomes difficult to apply to the current collector. When the average particle size is more than 15 ⁇ m, voids are likely to occur during filling, and the filling property is lowered.
  • the average particle size is more preferably 3 to 10 ⁇ m.
  • the positive electrode for a lithium ion battery includes, for example, a positive electrode mixture prepared by mixing a positive electrode active material for a lithium ion battery having the above-described configuration, a conductive additive, and a binder from an aluminum foil or the like.
  • the current collector has a structure provided on one side or both sides.
  • the lithium ion battery which concerns on embodiment of this invention is equipped with the positive electrode for lithium ion batteries of such a structure.
  • a metal salt solution is prepared.
  • the metal is at least one selected from Ni and Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr. It is.
  • the metal salt is sulfate, chloride, nitrate, acetate, etc., and nitrate is particularly preferable.
  • each metal contained in the metal salt is adjusted so as to have a desired molar ratio. Thereby, the molar ratio of each metal in the positive electrode active material is determined.
  • lithium carbonate is suspended in pure water, and then the metal salt solution of the metal is added to prepare a metal carbonate solution slurry. At this time, fine particles of lithium-containing carbonate precipitate in the slurry. If the lithium compound does not react during heat treatment such as sulfate or chloride as a metal salt, it is washed with a saturated lithium carbonate solution and then filtered off. When the lithium compound reacts as a lithium raw material during the heat treatment, such as nitrate or acetate, it can be used as a calcined precursor by washing and drying as it is without washing. Next, the lithium-containing carbonate separated by filtration is dried to obtain a lithium salt composite (precursor for lithium ion battery positive electrode material) powder.
  • a lithium salt composite precursor for lithium ion battery positive electrode material
  • a firing container having a predetermined capacity is prepared, and this firing container is filled with a precursor powder for a lithium ion battery positive electrode material.
  • the firing container filled with the precursor powder for the lithium ion battery positive electrode material is transferred to a firing furnace and fired. Firing is performed by heating and holding in an oxygen atmosphere for a predetermined time. Further, it is preferable to perform baking under a pressure of 101 to 202 KPa because the amount of oxygen in the composition further increases. Thereafter, the powder is taken out from the firing container and pulverized using a commercially available pulverizer or the like to obtain a powder of the positive electrode active material.
  • Crushing at this time is performed so that fine powder is not generated as much as possible, specifically, fine powder having a particle size of 4 ⁇ m or less is 10% or less in volume fraction, or the specific surface area of the powder is 0.40 to
  • the crushing strength and crushing time are appropriately adjusted so as to be 0.70 m 2 / g.
  • Examples 1 to 17 First, after suspending lithium carbonate of the input amount shown in Table 1 in 3.2 liters of pure water, 4.8 liter of metal salt solution was charged. Here, the nitrate hydrate of each metal was adjusted so that each metal might become the composition ratio of Table 1, and the total metal mole number might be set to 14 mol. Incidentally, a suspension of lithium carbonate, the product (lithium ion secondary battery positive electrode material, i.e. a cathode active material) x with Li (Li x Ni 1-xy M y) O 2 + ⁇ becomes a value shown in Table 1 Each of which is calculated by the following equation.
  • W (g) 73.9 ⁇ 14 ⁇ (1 + 0.5 ⁇ (1 + X) / (1-X) ⁇ ⁇ A
  • “A” is a numerical value to be multiplied in order to subtract the amount of lithium from the lithium compound other than lithium carbonate remaining in the raw material after filtration from the amount of suspension in addition to the amount necessary for the precipitation reaction. is there.
  • “A” is 0.9 when lithium salt reacts as a firing raw material such as nitrate or acetate, and “1” when lithium salt does not react as a firing raw material such as sulfate or chloride. 0.
  • fine particles of lithium-containing carbonate were precipitated in the solution, and this precipitate was filtered off using a filter press.
  • a lithium-containing carbonate (a precursor for a lithium ion battery positive electrode material).
  • a firing container was prepared, and this firing container was filled with a lithium-containing carbonate.
  • the firing container was placed in an oxygen atmosphere furnace under atmospheric pressure, heated and held at the firing temperature shown in Table 1 for 10 hours, and then cooled to obtain an oxide.
  • the obtained oxide is crushed so that fine powder having a particle size of 3 ⁇ m or less after pulverization has a predetermined volume fraction, and powder of a positive electrode material for a lithium ion secondary battery Got.
  • Example 18 Example 18 was carried out except that each metal of the raw material had the composition shown in Table 1, the metal salt was chloride, the lithium-containing carbonate was precipitated, washed with a saturated lithium carbonate solution, and filtered. The same treatment as in Examples 1 to 17 was performed.
  • Example 19 Example 19 was carried out except that each material of the raw material had the composition shown in Table 1, the metal salt was sulfate, the lithium-containing carbonate was precipitated, washed with a saturated lithium carbonate solution, and filtered. The same treatment as in Examples 1 to 17 was performed.
  • Example 20 As Example 20, the same processing as in Examples 1 to 17 was performed, except that each metal of the raw material had a composition as shown in Table 1 and baking was performed under a pressure of 120 KPa instead of atmospheric pressure.
  • Example 21 As Example 21, the same processing as in Examples 1 to 17 was performed, except that each material of the raw material had the composition shown in Table 1 and the crushing step was performed in an atmosphere of 60% or less humidity.
  • Comparative Examples 1 to 3 As Comparative Examples 1 to 3, Examples 1 to 17 were used except that each material of the raw material had a composition as shown in Table 1 and the final oxide disintegration was not adjusted as in Examples 1 to 17. The same process was performed.
  • Comparative Examples 4 to 6 As Comparative Examples 4 to 6, the same processing as in Comparative Example 1 was performed except that each metal of the raw material had the composition shown in Table 1 and the firing process was performed in an air atmosphere furnace instead of an oxygen atmosphere furnace.
  • Each positive electrode material, conductive material, and binder are weighed in a ratio of 85: 8: 7, and the positive electrode material and the conductive material are mixed into a slurry in which the binder is dissolved in an organic solvent (N-methylpyrrolidone). And coated on an Al foil, dried and pressed to obtain a positive electrode. Subsequently, a 2032 type coin cell for evaluation with Li as the counter electrode was prepared, and 1M-LiPF 6 dissolved in EC-DMC (1: 1) was used as the electrolyte, and the current density was 0.2C. The discharge capacity was measured.
  • Example 1 to 21 the composition specified in the present invention was obtained, the water content measured by Karl Fischer titration at 300 ° C. was 1100 ppm or less, and the discharge capacity, rate characteristics, and capacity retention were all good. Met. In Comparative Examples 1 and 3, the water content measured by Karl Fischer titration at 300 ° C. exceeded 1100 ppm, and the rate characteristics and capacity retention were poor. In Comparative Examples 2, 4, 5, and 6, the composition prescribed in the present invention was not obtained, the water content measured by Karl Fischer titration at 300 ° C. exceeded 1100 ppm, and the rate characteristics and capacity retention were poor. there were.

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PCT/JP2012/074266 2012-01-26 2012-09-21 リチウムイオン電池用正極活物質、リチウムイオン電池用正極、及び、リチウムイオン電池 Ceased WO2013111379A1 (ja)

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JP2013152911A (ja) 2013-08-08
CN104067424A (zh) 2014-09-24
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US20140339465A1 (en) 2014-11-20
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