Doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor thereof and preparation methods of doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied to battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of battery cycle performance degradation and structural instability, and achieve cycle performance improvement, cost saving, and simplification. The effect of the preparation process

Inactive Publication Date: 2018-07-06
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the positive electrode material becomes unstable under high voltage, which reduces the cycle performance of the battery.

Method used

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  • Doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor thereof and preparation methods of doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor
  • Doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor thereof and preparation methods of doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor
  • Doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor thereof and preparation methods of doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 0.1Zr / Ni 1 / 3 Co 1 / 3 Mn 1 / 3 (OH) 2 Preparation:

[0030] (1) According to the molar ratio of Ni:Co:Mn 1:1:1, add 0.1% of the total mass of the nickel-cobalt-manganese ternary precursor to prepare a mixture of nickel-cobalt-manganese-zirconium sulfate with a concentration of 1.5mol / L Aqueous solution, prepare a sodium hydroxide aqueous solution with a concentration of 8mol / L, and prepare an ammonia solution with a concentration of 8mol / L;

[0031] (2) Add a mother liquor with an ammonia concentration of 1.0-2g / L and a pH of 11.0-11.5 to the reactor, and make the mother liquor 60% of the reactor volume;

[0032] (3) Pour 1L / min of nitrogen into the sealed reactor, turn on the stirring, and rotate at 140r. Use the prepared sodium hydroxide solution and ammonia solution in step (1) to continuously pump into the reactor for 15 minutes, during which the metal mixture Turn off the pump, turn off the ammonia and alkali pump; turn on the metal mixture pump, pump the prepared metal salt...

Embodiment 2

[0041] 0.08Mg / Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 Preparation:

[0042] (1) According to the molar ratio of Ni:Co:Mn of 5:2:3, add 0.08% of the total mass of the nickel-cobalt-manganese ternary precursor to prepare a mixed aqueous solution of nickel-cobalt-manganese-magnesium sulfate with a concentration of 1.8mol / L , Prepare an aqueous sodium hydroxide solution with a concentration of 6 mol / L, and prepare an aqueous ammonia solution with a concentration of 10 mol / L;

[0043] (2) Add a mother liquor with an ammonia concentration of 2.5-3.0 g / L and a pH of 11.5-12.0 to the reactor, and make the mother liquor 80% of the reactor volume;

[0044] (3) Pour nitrogen 0.7L / min into the sealed reactor, turn on the stirring, and rotate at 380r / min. Use step (1) to continuously pump the sodium hydroxide aqueous solution and the ammonia aqueous solution into the reactor for 10 minutes. The metal mixture pump is turned off, and the ammonia alkali pump is turned off; the metal mixture pump is turned on, ...

Embodiment 3

[0052] 0.42Al / Ni 0.4 Co 0.2 Mn 0.4 (OH) 2 Preparation:

[0053] (1) According to the molar ratio of Ni:Co:Mn 4:2:4, add 0.42% of the total mass of the nickel-cobalt-manganese ternary precursor to prepare a nickel-cobalt-manganese-aluminum sulfate mixture with a concentration of 2.0mol / L Aqueous solution, prepare a sodium hydroxide aqueous solution with a concentration of 8mol / L, and prepare an ammonia solution with a concentration of 8mol / L;

[0054] (2) Add a mother liquor with an ammonia concentration of 0.5-1.0 g / L and a pH of 10.5-11.0 to the reactor, and make the mother liquor 40% of the reactor volume;

[0055] (3) Pour 1.5L / min of nitrogen into the sealed reactor, turn on the stirring at a speed of 200r / min, and use the prepared sodium hydroxide solution and ammonia solution in step (1) to continuously pump into the reactor for 5 minutes. The metal mixture pump is turned off and the ammonia alkali pump is turned off; the metal mixture pump is turned on, and the metal salt sol...

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Abstract

The invention relates to a doped small-particle size lithium nickel cobalt manganese oxide positive electrode material and a precursor thereof and preparation methods of the doped small-particle sizelithium nickel cobalt manganese oxide positive electrode material and the precursor. A small-particle size hydroxide precursor is produced by adopting a nucleation coprecipitation method; a chemical general formula of the precursor is mA/Ni<x>Co<y>Mn<1-x-y>(OH)<2>, wherein x is smaller than or equal to 0.5 and greater than or equal to 0.3; y is smaller than 0.5 and greater than or equal to 0.1; Ais one or more of zirconium, magnesium, titanium and aluminum; m represents the mass fraction m% of the element A in the total mass of the nickel cobalt manganese hydroxide precursor; m is smaller than or equal to 0.5 and greater than or equal to 0.05; the particle size D10 is greater than or equal to 1.5 microns and smaller than or equal to 4.0 microns; the particle size D50 is greater than or equal to 2.0 microns and smaller than or equal to 5.0 microns; the particle size D90 is smaller than or equal to 8 microns; the specific surface area is smaller than or equal to 30m<2>/g; and the tap density TD is greater than or equal to 1.3g/cm<3> and smaller than or equal to 2.0g/cm<3>. The precursor has the characteristics that the elements are uniformly distributed, the shapes of the particlesare spherical or quasi-spherical, the specific surface area is controllable, the tap density is relatively high and the precursor is high in cycle life after being sintered and high in capacity.

Description

Technical field [0001] The invention relates to a doped small particle size dynamic lithium nickel cobalt manganate positive electrode material and a preparation method of its precursor. Background technique [0002] Lithium-ion power batteries have been widely used in electric vehicles, power tools and grid energy storage fields due to their advantages of high working voltage, high energy density, and environmental friendliness. Among them, as a key material that affects the performance of lithium-ion power batteries, the development and production of cathode materials is very important. High-energy density, long-life and high-safety cathode materials have become a hot spot for research and development and attention in countries all over the world. [0003] At present, the most concerned lithium-ion power battery cathode materials include lithium iron phosphate (LiFePO 4 ), lithium manganate (LiMn 2 O 4 ), nickel-cobalt-manganese ternary materials (LiNi 1-x-y Co x Mn y O 2 )3 typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李国华张磊
Owner HENAN KELONG NEW ENERGY CO LTD
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