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

A high-nickel ternary material, magnesium technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of backscattering, reduce doping ion activity, complex preparation methods, etc., to improve structural stability properties, improved electronic conductance, improved rate capability and cycle performance

Inactive Publication Date: 2019-06-21
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. The preparation method is complicated, and there are defects that reduce the activity of dopant ions, and may cause electron deflection and lead to backscattering, thereby increasing the resistance of the material. High, in addition, the price of real graphene is 16 times that of gold, expensive, high preparation cost, not suitable for industrial production

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) According to Mg 2+ The doping amount is 0.5mol%, that is, the total metal content M (M=Ni+Co+Mn), 0.5mol%; the stoichiometric ratio of MgC is weighed 2 o 4 2H 2 O, Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, Li 2 CO 3 , so that the three are thoroughly mixed in a blender. Wherein the addition amount of lithium source is that the molar ratio of lithium ion and metal ion is Li + : (Mg+Ni+Co+Mn) 2+ =1.05:1.

[0026] (2) Move the above mixture into a tube furnace, heat it to 400°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 5 hours, and then heat it to 750°C at a heating rate of 5°C / min ℃, kept at this temperature for 15 hours, after natural cooling, crushing, grinding and sieving, Mg 2+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2 mn 0.2 ) 0.995 Mg 0.005 o 2 .

[0027] The material prepared by the above method was scanned by a scanning electron microscope (SEM); the mat...

Embodiment 2

[0031] (1) According to Mg 2+ The doping amount of is 1 mol%, that is, 1 mol% of the total metal content M (M=Ni+Co+Mn). Weigh out the stoichiometric ratio of MgC 2 o 4 2H 2 O, 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 the molar ratio of lithium ions to all metal ions is Li+: (Mg+Ni+Co+Mn) 2+ =1.05:1.

[0032] (2) Move the above mixture into a tube furnace, heat it to 400°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 5 hours, and then heat it to 780°C at a heating rate of 5°C / min ℃, kept at this temperature for 15 hours, after natural cooling, crushing, grinding and sieving, Mg 2+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2 mn 0.2 ) 0.99 Mg 0.01 o 2 .

[0033] The material obtained by the method described above was scanned by a scanning electron microscope (SEM); the material was asse...

Embodiment 3

[0035] (1) According to Mg 2+ The doping amount is 2mol%, that is, 2mol% of the total metal content M (M=Ni+Co+Mn), and the stoichiometric ratio of MgC is weighed 2 o 4 2H 2 O, 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 based on the molar ratio of lithium ions to metal ions Li+: (Mg+Ni+Co+Mn) 2+ =1.05:1.

[0036] (2) Move the above mixture into a tube furnace, heat it to 400°C at a heating rate of 2°C / min under an oxidizing atmosphere, keep it at this temperature for 5 hours, and then heat it to 800°C at a heating rate of 5°C / min ℃, kept at this temperature for 15 hours, after natural cooling, crushing, grinding and sieving, Mg 2+ Doped high-nickel ternary nickel-cobalt-manganese cathode material Li(Ni 0.6 co 0.2 mn 0.2 ) 0.98 Mg 0.02 o 2 .

[0037] The material obtained by the method described above was scanned by a scanning electron microscope (SEM); the material was assembled int...

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Abstract

The invention discloses a magnesium element-doped NCM622 type high-nickel ternary material and a preparation method thereof. The preparation method comprises the following steps of (1) according to apreset Mg2+ doping amount, weighing magnesium oxalate, LiNi0.6Co0.2Mn0.2O2 precursor and a lithium source based on stoichiometric ratio to be fully and uniformly mixed; and (2) putting the mixture into a tubular furnace, carrying out calcining at an air or oxygen atmosphere and a certain temperature for several hours, and performing grinding and sieving on the prepared product to obtain the high-nickel ternary material. According to the preparation method of the magnesium element-doped NCM622 type high-nickel ternary material, the Mg element is adopted to realize interval doping on LiNi0.6Co0.2Mn0.2O2 (NCM622), so that the process flow is simple; and the prepared lithium ion battery ternary positive electrode material is uniform in particle size distribution, clear in the particle boundary, relatively high in secondary particle spherical structure, and high in rate performance 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 a magnesium-doped NCM622 high-nickel ternary material and a preparation method thereof. Background technique [0002] In the context of the country's vigorous development of electric vehicles, the development of power batteries with high energy density is the general trend. Nickel-cobalt lithium manganese oxide ternary cathode material is regarded as the cathode material for the next generation of power batteries because of its large theoretical capacity and high energy density. Considering factors such as comprehensive cost and performance, LiNi 0.6 co 0.2 mn 0.2 o 2 It is the most potential positive electrode material for power batteries among the ternary materials. However, LiNi 0.6 co 0.2 mn 0.2 o 2 There are still deficiencies in cycle performance and rate performance, for which people are conducting related research. ...

Claims

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Application Information

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