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Ultra-small particle size single crystal nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-manganese technology, used in battery electrodes, electrical components, circuits, etc., to improve insertion and extraction, improve electrochemical performance, and have a wide range of applications

Pending Publication Date: 2022-05-06
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing processes and technologies have been able to realize ternary (nickel-cobalt-manganese) single-crystal cathode materials with D50>3μm, but ternary (nickel-cobalt-manganese) single crystals with D50<2μm and good dispersion can be prepared in the existing synthesis system type cathode material, still has great technical difficulty

Method used

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  • Ultra-small particle size single crystal nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • Ultra-small particle size single crystal nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • Ultra-small particle size single crystal nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

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preparation example Construction

[0029] The preparation method of the present invention comprises the steps:

[0030] 1) The high-nickel ternary precursor Ni 0.83 co 0.12 mn 0.05 (OH) 2 , lithium source and modification additives are mixed evenly for calcination, the sintering temperature rises at 230°C to 780°C, the sintering time is 4 to 8 hours, the constant temperature section is at 800 to 920°C, and the time is 7 to 15 hours to obtain oxidation modification high-nickel ternary cathode material;

[0031] Among them, the molar ratio of the precursor to the lithium source is 100: (103~110), the D50 of the PSD of the precursor is 2~5um; the lithium source is lithium hydroxide, and the D50 of the PSD is 2~5um; the modification additive is Containing at least one oxide, hydroxide or fluoride of Zr, Mg, Ti, Ce, Mo, Al, W, Nb, B or Sr elements, the D50 of the particle size PSD is 10-100nm, and the modification additive is added The amount is 100ppm-5000ppm of the total mass of high-nickel ternary precursor ...

Embodiment 1

[0038] 1) Mix the high-nickel ternary precursor, lithium source lithium hydroxide and modification additives evenly for calcination. The sintering temperature rises to 500°C within 6 hours, and the constant temperature section is 850°C for 10 hours. Oxidation-modified high-nickel ternary cathode material;

[0039] Among them, the total mass parts of the high-nickel ternary precursor and lithium hydroxide are 205 parts, and the modification aid is 0.00205 parts by mass of Mg(OH) 2 , that is, the amount added is 2050ppm. The molar ratio of the high-nickel ternary precursor to lithium hydroxide is 100:105; the nickel-cobalt-manganese ternary precursor uses Ni 0.83 co 0.12 mn 0.05 (OH) 2 .

[0040]2) Pulverize the ternary positive electrode material after primary calcination to obtain powder A with a particle size of D50<1 μm; the specific steps of pulverization are as follows: first, carry out a selection wheel mill, and the particle size D50 is below 10 μm, and then pass th...

Embodiment 2

[0049] 1) Mix the high-nickel ternary precursor, lithium source and modification additives evenly for calcination. The sintering temperature rises to 230°C within 8 hours, and the temperature in the constant temperature section is 800°C for 15 hours to obtain oxidation modification. high-nickel ternary cathode material;

[0050] Among them, the total mass parts of the high-nickel ternary precursor and lithium hydroxide are 203 parts, and the modification additive is 0.005 parts by mass of TiO 2 , that is, the amount added is 5000ppm. The molar ratio of high nickel ternary precursor to lithium hydroxide is 100:103.

[0051] 2) Pulverize the ternary positive electrode material after primary calcination to obtain powder A with a particle size of D50<1 μm; the specific steps of pulverization are as follows: first, carry out a selection wheel mill, and the particle size D50 is below 10 μm, and then pass through the rollers and come out The particle size D50 of the powder is less ...

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Abstract

The preparation method comprises the following steps: uniformly mixing a nickel-cobalt-manganese ternary precursor, a lithium source and a performance additive, and calcining the mixture at 800-920 DEG C for at least 5 hours to obtain an oxidation modified ternary positive electrode material; crushing the oxidized and modified ternary positive electrode material to obtain powder A; adding the powder A into water containing a sulfate type coating agent, carrying out washing coating modification, filtering to obtain powder B, and carrying out secondary calcination on the powder B at 500-700 DEG C for at least 3h to obtain powder C; and crushing the powder C again to obtain the ultra-small particle size single crystal nickel-cobalt-manganese ternary positive electrode material with the particle size of less than 2 microns. The ternary single crystal type positive electrode material with D50 smaller than 2 microns and good dispersity is prepared, and the gram volume and the rate capability of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to an ultra-small particle size single-crystal nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] As the most popular new energy battery at present, lithium-ion battery has become the mainstream battery after more than 30 years of industrial application. It is divided into batteries for power tools used in 3C digital electronic products and power tools; power batteries for vehicles, used in electric vehicles, And batteries for energy storage, used in power companies. At present, ternary (nickel-cobalt-manganese) lithium batteries have shown excellent comprehensive performance in terms of energy density, discharge voltage, etc., and have attracted widespread attention. [0003] At present, the most concerned is that the ternary (nickel-cobalt-manganese) cathode material is divided into t...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/525H01M4/505H01M4/625
Inventor 许开华李昌辉张翔李伟何锐
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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