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Doped high-nickel ternary precursor and preparation method thereof

A precursor and doping-type technology, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problem of not being able to obtain high-nickel ternary materials, and achieve the effect of improving cycle performance

Active Publication Date: 2019-07-09
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above existing technologies can obtain high-nickel ternary materials with stable structure and good cycle performance.

Method used

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  • Doped high-nickel ternary precursor and preparation method thereof
  • Doped high-nickel ternary precursor and preparation method thereof
  • Doped high-nickel ternary precursor and preparation method thereof

Examples

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Embodiment 1

[0031] This embodiment provides a zirconium-doped high-nickel ternary precursor and its preparation method, the steps are as follows:

[0032] Prepare 2mol / L nickel sulfate, cobalt sulfate, manganese sulfate mixed solution, Ni:Co:Mn ratio is 0.82:0.12:0.06, prepare 3mol / L ammonia water, prepare 4mol / L sodium hydroxide solution, mix these three kinds The solutions are injected into the stirred reactor at the same time, and the injection speed of the three solutions is adjusted so that the molar ratio of the three solutions is controlled at ammonia water / total metal salt=0.3, sodium hydroxide / total metal salt=2.0, and the reaction is controlled. The temperature is 50°C, the pH value is 11.8, and the particle size is continuously monitored during the process. When the particle size D50 grows to 7 μm, the reaction salt solution is replaced with a 2mol / L mixed solution of nickel sulfate, cobalt sulfate, manganese sulfate, and zirconium sulfate. The ratio of Ni:Co:Mn is 0.82:0.12:0....

Embodiment 2

[0036] This embodiment provides a molybdenum-doped high-nickel ternary precursor and its preparation method, the steps are as follows:

[0037] Prepare nickel sulfate, cobalt sulfate, manganese sulfate mixed solution of 2mol / L, Ni:Co:Mn ratio is 0.83:0.11:0.06, prepare the ammoniacal liquor of 3mol / L, prepare the sodium hydroxide solution of 4mol / L, these three kinds The solutions are injected into the stirred reactor at the same time, and the injection speed of the three solutions is adjusted so that the molar ratio of the three solutions is controlled at ammonia water / total metal salt=0.5, sodium hydroxide / total metal salt=2.2, and the reaction is controlled. The temperature is 50°C, the pH value is 11.7, and the particle size is continuously monitored during the process. When the particle size D50 grows to 6 μm, the reaction salt solution is replaced with a 2mol / L mixed solution of nickel sulfate, cobalt sulfate, manganese sulfate, and molybdenum sulfate. The ratio of Ni:Co...

Embodiment 3

[0041] This embodiment provides a cerium-doped high-nickel ternary precursor and its preparation method, the steps are as follows:

[0042] Prepare nickel sulfate, cobalt sulfate, manganese sulfate mixed solution of 0.5mol / L, Ni:Co:Mn ratio is 0.88:0.06:0.06, the ammoniacal liquor of preparation 5.2mol / L, the sodium hydroxide solution of preparation 4mol / L, this Three kinds of solutions are respectively co-currently injected into the reactor with stirring, and the injection speeds of the three kinds of solutions are adjusted so that the mol ratio of the three kinds of solutions is controlled at ammonia water / total metal salts=0.8, sodium hydroxide / total metal salts=2.4, Control the reaction temperature to 40°C, pH value to 11.8, and continuously monitor the particle size during the process. When the particle size D50 grows to 8 μm, replace the reaction salt solution with 0.5mol / L nickel sulfate, cobalt sulfate, manganese sulfate, and cerium sulfate In the mixed solution, the r...

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Abstract

The invention relates to a doped high-nickel ternary precursor and a preparation method thereof. The chemical formula of the doped high-nickel ternary precursor is NixCoyMnzMn(OH) 2, wherein x+y+z=1,x is more than or equal to 0.8 and less than 1, y is more than 0 and less than 0.2, z is more than 0 and less than 0.2, and n is more than 0 and less than 0.01; and M is selected from at least one ofZr, Ce, V, Cr, Sr, Mo, Sc, La, P, Nb, Y and Ga. The preparation method of the doped high-nickel ternary precursor comprises the following steps: firstly, preparing an undoped high-nickel ternary precursor, then adding M, and continuously conducting reacting to prepare the doped high-nickel ternary precursor. According to the preparation method disclosed by the invention, the comprehensive index ofthe precursor is ensured, the effective doping of elements is realized, and the cycle performance of a doped high-nickel ternary positive electrode material prepared by adopting the doped high-nickelternary precursor is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium battery cathode materials and their precursors, in particular to a doped high-nickel ternary precursor and a preparation method thereof. Background technique [0002] In recent years, the research and industrialization of ternary material power batteries have made great progress, and the industry generally believes that NCM power batteries will become the mainstream choice for future electric vehicles. Generally speaking, based on safety and cycle considerations, ternary power batteries mainly use 333, 442 and 523 series with relatively low nickel content, but as EVs have higher and higher energy density requirements, 622 , 811 and other high-nickel ternary materials are also receiving more and more attention. [0003] High-nickel ternary materials have higher energy density, but it is well known that the higher the nickel content in ternary materials, the worse the stability and safety of the material. I...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/61C01P2006/11C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王汝娜颜自燃哈立杨新河周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD
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