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Large-particle high-nickel quaternary precursor and preparation method thereof

A technology of large particles and precursors, used in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of material structure damage, side reactions, and electrical properties decline, to improve crystalline properties, enhance binding energy, prevent cracking effect

Active Publication Date: 2022-04-15
南通金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the cracked high-nickel quaternary precursor is prepared into the positive electrode material, the cracked part is very easy to have a side reaction with the electrolyte, resulting in the destruction of the structure of the material, which in turn reduces the electrical performance

Method used

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  • Large-particle high-nickel quaternary precursor and preparation method thereof
  • Large-particle high-nickel quaternary precursor and preparation method thereof
  • Large-particle high-nickel quaternary precursor and preparation method thereof

Examples

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Embodiment 1

[0041] A method for preparing a large-grain high-nickel quaternary precursor, comprising the following steps:

[0042]Step 1. Prepare the first metal liquid whose total molar concentration of Ni, Co and Mn is 2.0mol / L, and the molar ratio of Ni, Co and Mn elements is 85:10:5; prepare the total molar concentration of Ni, Co and Mn The second molten metal is 1.5mol / L, and the molar ratio of Ni, Co, and Mn elements is 85:10:5;

[0043] Prepare a sodium hydroxide (or potassium hydroxide) solution with a molar concentration of 10mol / L as a precipitant;

[0044] Prepare the first mixed solution of ammoniacal liquor, sodium metaaluminate and sodium hydroxide, wherein the concentration of the ammoniacal liquor is 2.4mol / L, the concentration of the sodium metaaluminate is 0.08mol / L, adjust the first mixed liquor by the sodium hydroxide The pH of the first mixed solution is 11.80~12.20; prepare the second mixed solution of ammonia water, sodium metaaluminate, sodium alginate and sodium...

Embodiment 2

[0050] A method for preparing a large-grain high-nickel quaternary precursor, comprising the following steps:

[0051] Step 1. Prepare the first metal liquid whose total molar concentration of Ni, Co and Mn is 2.0mol / L, and the molar ratio of Ni, Co and Mn elements is 92:5:3; prepare the total molar concentration of Ni, Co and Mn The second molten metal is 1.5mol / L, and the molar ratio of Ni, Co, and Mn elements is 92:5:3;

[0052] Prepare a sodium hydroxide (or potassium hydroxide) solution with a molar concentration of 10mol / L as a precipitant;

[0053] Prepare the first mixed solution of ammoniacal liquor, sodium metaaluminate and sodium hydroxide, wherein the concentration of the ammoniacal liquor is 2.4mol / L, the concentration of the sodium metaaluminate is 0.12mol / L, and the first mixed solution is adjusted by the sodium hydroxide The pH of the first mixed solution is 11.80~12.20; prepare the second mixed solution of ammonia water, sodium metaaluminate, sodium alginate ...

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Abstract

The invention discloses a preparation method of a large-particle high-nickel quaternary precursor. The chemical formula of the high-nickel quaternary precursor is Ni < x > Co < y > Mn < z > Al < k > (OH) < 2 >. The method comprises the following steps: 1, preparing a first metal liquid and a second metal liquid of Ni, Co and Mn; preparing a sodium hydroxide or potassium hydroxide solution as a precipitator; preparing a first mixed solution of ammonia water, sodium metaaluminate and a precipitator; preparing a second mixed solution of ammonia water, sodium metaaluminate, sodium alginate and a precipitator; 2, introducing nitrogen into the reaction kettle, and adding a precipitator, pure water and ammonia water to prepare a base solution; thirdly, stirring is kept, and the first molten metal, a precipitant and the first mixed solution are added for coprecipitation; 4, adding a second metal liquid and a second mixed liquid; materials in the aging tank are intermittently returned to the reaction kettle in the reaction process; and 5, carrying out filter pressing, washing and drying on the product to obtain the internally hollow quaternary precursor. The large-particle high-nickel quaternary precursor is prepared in a segmented synthesis mode, and the surface of the precursor is complete and free of a cracking phenomenon.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a large-grain high-nickel quaternary precursor and a preparation method thereof. Background technique [0002] With the rapid development of the world economy, on the one hand, the consumption of traditional fossil fuels is gradually increasing. Due to their non-renewable nature, the pressure of energy shortage will gradually increase. On the other hand, as the country clarifies the timetable for carbon peaking and carbon neutrality, the phase-out of fossil fuels has also been accelerated. As the source of power for electric vehicles, lithium-ion batteries are expected to replace traditional fuel and ease energy pressure. High nickel quaternary precursor is expected to become one of the mainstream power battery materials due to its high energy density and low price. [0003] The high-nickel quaternary precursor is prone to cracking during the prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00
CPCY02E60/10
Inventor 李加闯刘进才朱用王梁梁贺建军
Owner 南通金通储能动力新材料有限公司
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