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Multi-anion doped single crystal high-nickel positive electrode material and preparation method thereof

A positive electrode material and polyanion technology, which is applied in the field of polyanion-doped single-crystal high-nickel positive electrode materials and its preparation, to achieve uniform distribution of doped anions, stable structure, and excellent doping effect

Active Publication Date: 2021-04-13
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual research, it is found that when doping with multiple anions, since the doping amount of anions is a small amount, the final doping result is: there is only one doped anion in the oxygen layer, and the positive electrode doped with a single anion is also obtained. Material structure, incapable of efficient polyanion doping

Method used

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  • Multi-anion doped single crystal high-nickel positive electrode material and preparation method thereof
  • Multi-anion doped single crystal high-nickel positive electrode material and preparation method thereof
  • Multi-anion doped single crystal high-nickel positive electrode material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0045] A method for doping a single-crystal high-nickel positive electrode material with polyanions, comprising the following steps:

[0046] S1. Weigh the prepared 10g single crystal Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, 4.998g LiOH·H 2 O and 0.15g LiCl, the three are uniformly mixed by absolute ethanol, and ground for 30min in a mortar, until the complete volatilization of absolute ethanol obtains the first mixture;

[0047] S2. The first mixture is placed in a tube furnace, and calcined under an oxygen atmosphere, and the temperature is raised to 580° C. at a controlled heating rate of 5° C. / min. The temperature is kept at 8 hours, and then the temperature is raised to 700° C. at a controlled heating rate of 2° C. / min. Insulated for 8 hours, and the calcined material was cooled to obtain Cl-doped - single crystal high nickel ternary material;

[0048] S3, weigh 0.15g elemental S and S2 mixed with Cl - 10g of single-crystal high-nickel ternary materials were placed i...

Embodiment 2

[0052] A method for doping a single-crystal high-nickel positive electrode material with polyanions, comprising the following steps:

[0053] S1. Weigh the prepared 10g single crystal Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, 4.998g LiOH·H 2 O and 0.2gNH 4 F, using absolute ethanol to uniformly mix the three, and grind for 30 minutes in a mortar, until the absolute ethanol is completely volatilized to obtain the first mixture;

[0054] S2. The first mixture is placed in a tube furnace and calcined under an oxygen atmosphere. The heating rate is controlled at 5°C / min and the temperature is raised to 580°C. The temperature is kept at 15h, and then the temperature is raised to 1000°C at a controlled heating rate of 2°C / min. Insulated for 15h, and the calcined material was cooled to obtain a mixture doped with F - single crystal high nickel ternary material;

[0055] S3, weighed 0.15g thioacetamide and S2 obtained doped with F -10g of the single-crystal high-nickel ternary ma...

Embodiment 3

[0058] A method for doping a single-crystal high-nickel positive electrode material with polyanions, comprising the following steps:

[0059] S1. Weigh the prepared 10g single crystal Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, 4.998g LiOH·H 2 O and 0.1gKCl, utilize dehydrated ethanol to uniformly mix the three, grind in a mortar for 30min, and treat that dehydrated ethanol is completely volatilized to obtain the first mixture;

[0060] S2. The first mixture is placed in a tube furnace and calcined under an oxygen atmosphere. The heating rate is controlled at 5°C / min and the temperature is raised to 580°C. The temperature is kept for 10 hours, and then the temperature is raised to 800°C at a controlled heating rate of 2°C / min. Insulated for 10h, the calcined material was cooled to obtain the Cl-doped - single crystal high nickel ternary material;

[0061] S3, weigh 0.15g LiF and S2 obtained doped with Cl - 10g of the single-crystal high-nickel ternary material were placed in...

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Abstract

The invention discloses a multi-anion doped single crystal high-nickel positive electrode material and a preparation method thereof. The preparation method comprises the following steps of S1, uniformly mixing an anion A, a lithium salt and a high-nickel single crystal ternary precursor in absolute ethyl alcohol to obtain a first mixture, S2, calcining the first mixture in a tubular furnace to obtain a mono-anion doped single-crystal high-nickel positive electrode material, and S3, respectively putting the single crystal high-nickel positive electrode material obtained in the anions B and S2 into a tubular furnace, and carrying out gas phase doping to obtain the material. According to the preparation method, a precursor doped with one anion is calcined to obtain a single-anion doped single-crystal high-nickel ternary positive electrode material, and then the other anion and the obtained single-anion doped high-nickel single-crystal ternary positive electrode material are subjected to gas-phase doping to successfully obtain the multi-anion doped high-nickel single-crystal positive electrode material. The defect that multi-anion doping cannot be effectively achieved in a traditional mode is overcome, the doping effect is excellent, and the rate capability of the single-crystal high-nickel ternary material is successfully improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a multi-anion-doped single crystal high-nickel positive electrode material and a preparation method thereof. Background technique [0002] With the continuous development of society, traditional energy sources such as coal, oil and natural gas have become less and less, but the demand for energy in today's era is getting higher and higher. Therefore, searching for green alternative new energy sources has become an indispensable topic in today's era. At present, the available new energy sources, such as solar energy, wind energy, tidal energy and geothermal energy, depend to a large extent on the influence of the natural environment, and are scattered and not concentrated, so specific energy storage devices are required to control them. Energy storage and conversion. Lithium-ion battery, as an energy storage device, can realize the free exchange between che...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 陈来苏岳锋聂启军张其雨卢赟包丽颖吴锋
Owner 北京理工大学重庆创新中心
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