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High-nickel single-crystal ternary precursor and preparation method thereof

A precursor and single crystal technology, applied in the field of high nickel single crystal ternary precursor and its preparation, can solve the problems of inappropriate primary particle thickness and material capacity decay, etc.

Active Publication Date: 2021-09-10
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

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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-nickel single crystal ternary precursor and its preparation method. Capacity fading and technical problems of inappropriate primary particle thickness

Method used

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  • High-nickel single-crystal ternary precursor and preparation method thereof
  • High-nickel single-crystal ternary precursor and preparation method thereof
  • High-nickel single-crystal ternary precursor and preparation method thereof

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Embodiment 1

[0042] A kind of preparation method of high-nickel single crystal ternary precursor, described preparation method comprises the following steps:

[0043] Step 1. Pretreatment stage: Ni 2+ 、Co 2+ , Mn 2+ Potassium and three oxalato manganese (Ⅲ) according to the general formula Ni 0.85 co 0.09 mn 0.06 (OH) 2 Prepare a soluble mixed salt solution in the corresponding element molar ratio, wherein, the Mn of potassium trioxalatomanganate (Ⅲ) 3+ with Mn 2+ The molar ratio of the salt solution is 3, so as to refine the primary particles of the secondary particles and increase the specific surface area; the pH value of the mixed salt solution is 4.5-5.5.

[0044] Ni in the mixed salt solution described in step 1 2+ The concentration is 100g / L, Co 2+ The concentration is 10.5 g / L, Mn 2+ The concentration is 6.5g / L, Ni 2+ 、Co 2+ and Mn 2+ The total concentration of the three metal ions was 117 g / L.

[0045] Prepare a sodium hydroxide solution with a mass fraction of 32% a...

Embodiment 2

[0054] A kind of preparation method of high-nickel single crystal ternary precursor, described preparation method comprises the following steps:

[0055] Step 1. Pretreatment stage: Ni 2+ 、Co 2+ , Mn 2+ Potassium and three oxalato manganese (Ⅲ) according to the general formula Ni 0.92 co 0.05 mn 0.03 (OH) 2 Prepare a soluble mixed salt solution in the corresponding element molar ratio, wherein, the Mn of potassium trioxalatomanganate (Ⅲ) 3+ with Mn 2+ The molar ratio of the salt solution is 2, so as to refine the primary particles of the secondary particles and increase the specific surface area; the pH value of the mixed salt solution is 4.5-5.5.

[0056] Ni in the mixed salt solution described in step 1 2+ The concentration is 108 g / L, Co 2+ The concentration is 6 g / L, Mn 2+ Concentration of 3 g / L, Ni 2+ 、Co 2+ and Mn 2+ The total concentration of the three metal ions was 117g / L.

[0057] Prepare a sodium hydroxide solution with a mass fraction of 32% as a prec...

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Abstract

Provided are a high-nickel single-crystal ternary precursor and a preparation method thereof. The preparation method comprises the following steps of: preparing a mixed salt solution from Ni < 2 + >, Co < 2 + >, Mn < 2 + > and potassium trioxalato (III) acid according to the general formula, the molar ratio of Mn < 3 + > to Mn < 2 + > of the potassium trioxalato (III) acid is 2-4, primary particles of secondary particles are refined, and the specific surface area is increased. adding the mixed salt solution, a precipitant solution and a complexing agent solution into a reaction kettle, and reacting to generate high-nickel single-crystal ternary precursor slurry; and carrying out filter pressing, washing and drying to obtain the high-nickel single crystal ternary precursor. The primary particles are sheet-shaped, and the thickness is 50-110 nm. The technical problems of material capacity attenuation and inappropriate primary particle thickness caused by mixed arrangement of nickel and lithium cations in the subsequent mixed calcining process of the existing high-nickel single crystal ternary precursor and a lithium source are solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a high-nickel single crystal ternary precursor and a preparation method thereof. Background technique [0002] High-nickel single crystal ternary cathode material has the advantages of high specific capacity, low pollution, moderate price, and good matching with electrolyte, etc., and has become the focus of attention of cathode materials, and is considered to be a very promising cathode material for lithium-ion batteries. There is a very broad market in the field of power batteries. Compared with high-nickel polycrystalline ternary cathode materials, high-nickel single-crystal ternary cathode materials have fewer grain boundaries, lower internal resistance, and better cycle performance. In addition, the high-nickel single crystal ternary cathode material has higher mechanical strength and higher compaction density than the high-nickel polycrystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/22
CPCC30B7/105C30B29/22Y02E60/10
Inventor 李加闯禇凤辉朱用孟一鸣成鑫丽王梁梁贺建军
Owner 南通金通储能动力新材料有限公司
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