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Mg-Zr co-doped high-nickel ternary material and preparation method and application thereof

A high-nickel ternary material and co-doping technology, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of lattice oxygen precipitation and other problems, reduce the problem of oxygen precipitation, the preparation method is simple and easy, and reduce Li/ The effect of Ni mixing

Inactive Publication Date: 2021-03-12
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the Ni / Li ion mixing phenomenon existing in the practical application of high-nickel ternary materials, the problem of oxygen precipitation in the lattice of the material itself, the purpose of the present invention is to provide a kind of solution that can solve the problem of oxygen precipitation and Li / Li ions in high-nickel ternary materials. The Mg-Zr co-doping preparation method of Ni ion mixing is specifically realized by the following technical scheme:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of Mg-Zr co-doped high-nickel ternary positive electrode material comprises the following steps:

[0017] Step one, Ni 0.8 co 0.1 mn 0.06 Mg 0.02 Zr 0.02 (OH) 2 Precursor preparation: Weigh Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , Mg(NO 3 ) 2 , Zr(NO 3 ) 4 As raw materials, then add the above raw materials into deionized water and mix to prepare a premixed solution. Use NaOH solution and ammonia water to adjust the pH value of the premixed solution to about 12, continue to stir for 1 hour, wait for 2 to 3 minutes to settle, filter and wash, and take The filter residue was dried for 12 hours in a blast drying oven at a drying temperature of 60°C, and finally Ni was obtained. 0.8 co 0.1 mn 0.06 Mg 0.02 Zr 0.02 (OH) 2 Precursor.

[0018] Step two, LiNi 0.8 co 0.1 mn 0.06 Mg 0.02 Zr 0.02 o 2 The preparation of: according to the molar ratio of Li and Ni+Co+Mn+Mg+Zr is the ratio of 1.05:1, lithium source and the Ni that step ...

Embodiment 2

[0020] The preparation method of Mg-Zr co-doped high-nickel ternary positive electrode material comprises the following steps:

[0021] Step one, Ni 0.8 co 0.1 mn 0.06 Mg 0.03 Zr 0.01 (OH) 2 Precursor preparation: Weigh Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , Mg(NO 3 ) 2 , Zr(NO 3 ) 4 As a raw material, add the above raw materials into deionized water and mix to prepare a premixed solution. Use NaOH solution and ammonia water to adjust the pH value of the premixed solution to about 12, continue to stir for 2 hours, wait for 2 to 3 minutes to settle, filter and wash, and take The filter residue was dried for 12 hours in a blast drying oven at a drying temperature of 60°C, and finally Ni was obtained. 0.8 co 0.1 mn 0.06 Mg 0.03 Zr 0.01 (OH) 2 Precursor.

[0022] Step two, LiNi 0.8 co 0.1 mn 0.06 Mg 0.03 Zr 0.01 o 2 The preparation of: according to the molar ratio of Li and Ni+Co+Mn+Mg+Zr is the ratio of 1.05:1, lithium source and the Ni that step 1 m...

Embodiment 3

[0024] The preparation method of Mg-Zr co-doped high-nickel ternary positive electrode material comprises the following steps:

[0025] Step one, Ni 0.8 co 0.1 mn 0.06 Mg 0.01 Zr 0.03 (OH) 2 Precursor preparation: Weigh Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , Mg(NO3 ) 2 , Zr(NO 3 ) 4 As a raw material, add the above raw materials into deionized water and mix to prepare a premixed solution. Use NaOH solution and ammonia water to adjust the pH value of the premixed solution to about 12, continue to stir for 3 hours, wait for 2 to 3 minutes to settle, filter and wash, and take The filter residue was dried for 12 hours in a blast drying oven at a drying temperature of 60°C, and finally Ni was obtained. 0.8 co 0.1 mn 0.06 Mg 0.01 Zr 0.03 (OH) 2 Precursor.

[0026] Step two, LiNi 0.8 co 0.1 mn 0.06 Mg 0.01 Zr 0.03 o 2 The preparation of: according to the molar ratio of Li and Ni+Co+Mn+Mg+Zr is the ratio of 1.05:1, lithium source and the Ni that step 1 mak...

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Abstract

The invention discloses an Mg-Zr co-doped high-nickel ternary material and a preparation method and application thereof. The preparation method comprises the following steps: mixing all raw materialsexcept a Li source with water to obtain a precursor, wherein the molar ratio of Ni:Co:(Mn+Mg+Zr) is 8:1:1; and then mixing the Mg-Zr-co-doped high-nickel ternary material with a Li source in ethanol,stirring, filtering and drying, and then heating in different temperature intervals in an oxygen atmosphere to obtain the Mg-Zr-co-doped high-nickel ternary material, wherein the molar ratio of Li:(Ni+Co+Mn+Mg+Zr) is 1.05:1. The preparation method is simple and easy to implement, the doped Mg ions can enter the Li site, the material structure is further stabilized, Li / Ni mixed arrangement is reduced, the doped Zr ions enter the Ni site, the problem of oxygen precipitation of material lattices is reduced, and when the high-nickel material is used as the cathode material of the lithium ion battery based on the synergistic effect of Mg and Zr co-doping, the problems of Li / Ni mixed arrangement and oxygen precipitation of the material are solved, so that the cycling stability of the battery iseffectively improved, and the material has a relatively great application prospect in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a Mg-Zr co-doped high-nickel ternary material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to their advantages such as high energy density, long cycle life, environmental friendliness and no memory response. Although lithium-ion batteries have made remarkable achievements in the field of portable digital electronic products, their energy density still needs to be continuously improved to meet the application in new energy vehicles. High-nickel ternary materials are regarded as an ideal cathode material for high-energy-density lithium-ion batteries due to their high reversible capacity (~4.3V, 200mAh / g) and low cost. However, as high as 80% nickel content will also bring a series of problems, such as Ni 2+ The ionic radius of Li + The radius of is close, and it is easy for Ni to occup...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525
CPCH01M4/362H01M4/485H01M4/505H01M4/525Y02E60/10
Inventor 陈东初戎海波余海军
Owner FOSHAN UNIVERSITY
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