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A kind of doping type high-nickel ternary precursor and preparation method thereof

A precursor and doped technology, which is applied in the field of doped high nickel ternary precursor and its preparation, can solve the problems of inability to obtain structural high nickel ternary materials and the like

Active Publication Date: 2021-07-13
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of doping type high-nickel ternary precursor and preparation method thereof
  • A kind of doping type high-nickel ternary precursor and preparation method thereof

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Experimental program
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Effect test

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: Ni x co y mn z m n (OH) 2 , where x+y+z=1, 0.8≤x<1, 0<y<0.2, 0<z<0.2, 0<n<0.01; M is selected from Zr, Ce, V, Cr, Sr, Mo, Sc , La, P, Nb, Y, Ga at least one. The preparation method of the doped high-nickel ternary precursor is as follows: firstly prepare an undoped high-nickel ternary precursor, then add M, and continue the reaction to prepare a doped high-nickel ternary precursor. The invention not only ensures the comprehensive index of the precursor but also realizes the effective doping of elements. The doped high-nickel ternary positive electrode material prepared by using the doped high-nickel ternary precursor has a relatively large cycle performance. promote.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525C01G53/00H01M10/0525
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