Aluminum element doped NCM622 type high-nickel ternary material and preparation method thereof

A high-nickel ternary material and element doping technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as being unsuitable for industrial production, reducing doping ion activity, and increasing material resistance, achieving good The effect of rate performance and cycle stability, simple process flow and uniform particle size distribution

Inactive Publication Date: 2019-05-14
四川纳创时代新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent needs to use graphene to modify the dopant ions in advance, which has the disadvantage of reducing the activity of dopant ions, and may deflect electrons and cause backscattering, thereby increasing the resistance of the material. In addition, the real The price of graphene is 16 times that of gold, it is expensive and the preparation cost is high, and it is not suitable for industrial production

Method used

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  • Aluminum element doped NCM622 type high-nickel ternary material and preparation method thereof
  • Aluminum element doped NCM622 type high-nickel ternary material and preparation method thereof
  • Aluminum element doped NCM622 type high-nickel ternary material and preparation method thereof

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Embodiment 1

[0026] This embodiment provides a method for preparing an aluminum-doped NCM622 high-nickel ternary material, which specifically includes the following steps:

[0027] (1) According to Al 3+ The doping amount is 1mol%, that is, 1mol% of the total metal content M (M=Ni+Co+Mn), and the stoichiometric ratio of Al(OH) is weighed 3 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, Li 2 CO 3 , mix thoroughly in a blender until smooth. The amount of lithium source added is according to the molar ratio of lithium ions to all metal ions Li + :Al 3+ +(Ni+Co+Mn) 2+ =1.05:1.

[0028] (2) Move the above mixture into a tube furnace, heat it to 450°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 4 hours, and then heat it to 750°C at a heating rate of 5°C / min. ℃, kept at this temperature for 12 hours, after natural cooling, crushing, grinding and sieving, Al 3+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2...

Embodiment 2

[0033] This embodiment provides a method for preparing an aluminum-doped NCM622 high-nickel ternary material, which specifically includes the following steps:

[0034] (1) According to Al 3+ The doping amount is 2mol%, that is, 2mol% of the total metal content M (M=Ni+Co+Mn), and the stoichiometric ratio of Al(OH) is weighed 3 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, Li 2 CO 3 Mix well in a mixer until smooth. The amount of source added is the molar ratio of lithium ions to all metal ions is Li + :Al 3+ +(Ni+Co+Mn) 2+ =1.05:1.

[0035] (2) Move the above mixture into a tube furnace, heat it to 450°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 4 hours, and then heat it to 780°C at a heating rate of 5°C / min ℃, kept at this temperature for 12 hours, after natural cooling, crushing, grinding and sieving, Al 3+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2 mn 0.2 ) 0.98 al 0.02 o ...

Embodiment 3

[0038] This embodiment provides a method for preparing an aluminum-doped NCM622 high-nickel ternary material, which specifically includes the following steps:

[0039] (1) According to Al 3+ The doping amount is 3mol% / M, and the Al(OH) of the stoichiometric ratio is weighed 3 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, Li 2 CO 3 Mix well in a mixer until smooth. The amount of lithium source added is the molar ratio Li of lithium ions to all metal ions + :Al 3+ +(Ni+Co+Mn) 2+ =1.05:1.

[0040] (2) Move the above mixture into a tube furnace, heat it to 450°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 4 hours, and then heat it to 800°C at a heating rate of 5°C / min. ℃, kept at this temperature for 12 hours, after natural cooling, crushing, grinding and sieving, Al 3+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2 mn 0.2 ) 0.97 al 0.03 o 2 .

[0041] The material obtained by the met...

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Abstract

The invention discloses an aluminum element doped NCM622 type high-nickel ternary material and a preparation method thereof. The preparation method includes the following steps: (1) according to the estimated doping amount of Al element, weighing Al(OH)3, an Ni0.6Co0.2Mn0.2(OH)2 precursor and Li2CO3 with a stoichiometric ratio, and mixing fully and evenly; and (2) placing the mixture into a tubular furnace, calcining for several hours in an air or oxygen atmosphere at a certain temperature, and grinding and sieving the obtained product to obtain the material. By adopting the preparation methodprovided by the invention, doping modification is carried out on a high-nickel ternary positive electrode material, so that the structural stability of the high-nickel ternary material can be effectively improved, and the rate capability and cycling performance of the material can be improved; the process flow is simple; and the prepared lithium-ion battery ternary positive electrode material also has uniform particle size distribution, clear particle boundaries, good secondary particle spherical structure and good rate capability and cycling stability.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to an aluminum element-doped NCM622 high-nickel ternary material and a preparation method thereof. Background technique [0002] High nickel ternary material LiNi 0.6 co 0.2 mn 0.2 o 2 Due to its excellent performance, it is more and more recognized and favored by the market, but the pure phase LiNi 0.6 co 0.2 mn 0.2 o 2 Cathode materials are somewhat insufficient in terms of specific discharge capacity and cycle stability. For this, researchers usually use doping modification to improve the electrochemical performance of cathode materials. Studies have shown that for LiNi 0.6 co 0.2 mn 0.2 o 2 Doping a certain amount of Al element can significantly increase the diffusion coefficient of Li+. Related literature proves that since the chemical bond of Al-O is much stronger than that of Li-O, the doping of Al element can expand t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 叶飞
Owner 四川纳创时代新能源科技有限公司
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