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Preparation method of ternary positive electrode material

A cathode material and mixing technology, which is applied in the field of preparation of ternary cathode materials, to achieve the effects of improved cycle performance, high ion conductivity, and low explosiveness

Pending Publication Date: 2022-04-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method of a ternary cathode material for the first time to solve the problem of improving the cycle life of the battery while maintaining the energy density

Method used

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  • Preparation method of ternary positive electrode material

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preparation example Construction

[0038] The preparation method of ternary cathode material of the present invention comprises the following steps:

[0039] 1. Weigh the precursor according to the material design ratio, where the precursor includes lithium source, nickel source, manganese source or cobalt source.

[0040] The lithium source includes lithium acetate, sulfate, nitrate, carbonate, and lithium chloride or lithium hydroxide.

[0041] Described nickel source, manganese source, cobalt source can be following one or more, the sulfate, nitrate, carbonate, acetate, hydroxide, chloride, oxide of nickel, manganese or cobalt element , and oxidized copolymers of two or three elements;

[0042] 2. Put the precursor into the high-speed mixer and start mixing. While mixing, use a spray diffuser to spray the grinding medium in the grinding medium tank into the high-speed mixer.

[0043] The grinding medium is one of n-nonane, isononane, and liquid paraffin solution, and the volume of the grinding medium is 0....

Embodiment 1

[0058] Take 10.5kg of lithium hydroxide and nickel-cobalt-manganese oxide with a ratio of 80:10:10 and put it into a high-speed mixer, and the molar ratio of lithium hydroxide to nickel-cobalt-manganese oxide is 1.05:1.

[0059] The grinding medium n-nonane is sprayed into the grinding medium tank in the form of spray infusion, and the spray speed is 1.8g / min. When the total amount of liquid injected reaches half of the total amount of solids, the spraying is stopped.

[0060] Continue to stir. After the total mixing time reaches 25 minutes, dry at 120°C. The evaporated solvent is condensed by the condenser and then flows back into the grinding medium tank for repeated spraying.

[0061] After the material is dried for 15 minutes, it is sintered at 750° C. under oxygen for 12 hours, and the sintered material is crushed to obtain the desired positive electrode material.

[0062] Afterwards, the material and 17.7g LiCl material were mixed evenly by the same wet method and then d...

Embodiment 2

[0066] Take 5.3 kg of lithium hydroxide and nickel-cobalt-manganese oxide with a ratio of 70:20:10 and put it into a high-speed mixer, and the molar ratio of lithium hydroxide to nickel-cobalt-manganese oxide is 1.2:1.

[0067] The liquid paraffin of the grinding medium is sprayed into the grinding medium tank in the form of spray infusion, and the spray speed is 0.9g / min. When the total amount of liquid injected reaches 0.3 times of the total amount of solids, the spraying is stopped.

[0068] Continue to stir. After the total mixing time reaches 30 minutes, dry at 130°C. The evaporated solvent is condensed by the condenser and then flows back into the grinding medium tank for repeated spraying.

[0069] After the material is dried for 15 minutes, it is sintered at 800° C. under oxygen for 12 hours. The sintered material is crushed to obtain the desired positive electrode material.

[0070] Afterwards, the material was mixed with 540.75 g of LiBr to Li at a molar ratio of 1:2...

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Abstract

The invention relates to a preparation method of a ternary positive electrode material. The preparation method comprises the following steps: mixing a precursor, spraying a grinding medium into a high-speed mixer, mixing and drying; the dried and recycled gas is recycled into the grinding medium tank through condensing and filtering equipment; and sintering the dried precursor at high temperature to obtain the ternary positive electrode material. Mixing the ternary positive electrode material with at least one coating raw material of LiX, a mixture of Li2O and LiX and a mixture of LiX and LiOH, and drying to obtain a coating raw material; and calcining the coated raw material to obtain the Li2OH < X > coated high-nickel ternary material. According to the invention, a ternary positive electrode material raw material is prepared by taking a high-boiling-point organic system solution as a medium through mixing, a grinding medium is added in an atomizing manner, a mixed material and an organic system recycling system are added, and the high-nickel ternary material is coated with Li2OH, so that the first effect and the cycle performance of the battery are improved from the perspective of lithium source supplementation; and the gram volume of the material is not reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a ternary positive electrode material. Background technique [0002] At present, lithium-ion batteries have gradually become the mainstream product of secondary batteries. Compared with nickel-cadmium and lead-acid batteries, lithium-ion batteries have the advantages of high specific capacity, good cycle performance and low environmental pollution, and are more in line with people's daily needs. The demand for energy miniaturization in daily life is also in line with the concept of clean energy batteries. Therefore, from small household appliances for daily use to energy storage, automobiles and other large-scale power consumption fields, they are gradually switching to lithium-ion batteries. [0003] Cathode material is an important part of lithium-ion batteries, and its performance directly determines the performance of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01D15/00H01M4/505H01M4/525
CPCC01G53/50C01D15/00H01M4/505H01M4/525C01P2006/40C01P2004/80
Inventor 别晓非陈慧明胡景博闫晟睿赵光宇翟喜民姜涛
Owner CHINA FIRST AUTOMOBILE
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