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Preparation method for high-nickel ternary material of lithium ion battery

A technology of high-nickel ternary materials and lithium-ion batteries, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve poor processing performance and storage performance, poor cycle stability, high-nickel materials The problem of high residual alkali on the surface can achieve the effects of reducing adverse effects, easy industrialization, and excellent modification effect

Active Publication Date: 2019-03-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-nickel materials (Ni≥80%), their cycle stability is poor
In the case of the same Ni content, the cycle performance of the pellets is relatively large, which will cause a mismatch in the cycle performance and further deteriorate the cycle stability.
In addition, the residual alkali on the surface of high-nickel materials is relatively high, which leads to very poor processing performance and storage performance of the material, and at the same time, the high-temperature performance of the battery is also poor

Method used

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  • Preparation method for high-nickel ternary material of lithium ion battery
  • Preparation method for high-nickel ternary material of lithium ion battery
  • Preparation method for high-nickel ternary material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) The high-nickel ternary hydroxide precursor Ni with a D50 of 10um prepared by the continuous co-precipitation method 0.85 co 0.1 mn 0.05 (OH) 2 LiNi is obtained by mixing and sintering with fine powder lithium hydroxide with a D50 of 7um at 770°C 0.85 co 0.1 mn 0.05 o 2 material, then for LiNi 0.85 co 0.1 mn 0.05 o 2 The material is crushed and classified, and divided into large-size high-nickel ternary material and small-size high-nickel ternary material. The D50 difference between the large-size high-nickel ternary material and the small-size high-nickel ternary material is 10-11um;

[0036] (2), the large size LiNi 0.85 co 0.1 mn 0.05 o 2 Materials and Small Size LiNi 0.85 co 0.1 mn 0.05 o 2 The materials are all stirred and washed, the ratio of water to material is 1:1, small size LiNi 0.85 co 0.1 mn 0.05 o 2 The washing time of the material is 10 minutes, and the large size LiNi 0.85 co 0.1mn 0.05 o 2 The washing time of the material is...

Embodiment 2

[0039] (1) The high-nickel ternary hydroxide precursor Ni with a D50 of 8um prepared by the continuous co-precipitation method 0.8 co 0.1 mn 0.1 (OH) 2 LiNi is obtained by mixing and sintering with fine powder lithium hydroxide with a D50 of 15um at 770°C 0.80 co 0.1 mn 0.1 o 2 material, then for LiNi 0.80 co 0.1 mn 0.1 o 2 The material is crushed and classified, and divided into large-size high-nickel ternary material and small-size high-nickel ternary material. The D50 difference between the large-size high-nickel ternary material and the small-size high-nickel ternary material is 5-6um;

[0040] (2), the large size LiNi 0.80 co 0.1 mn 0.1 o 2 Materials and Small Size LiNi 0.80 co 0.1 mn 0.1 o 2 The materials are all stirred and washed, the ratio of water to material is 2:1, small size LiNi 0.80 co 0.1 mn 0.1 o 2 The washing time of the material is 5 minutes, and the large size LiNi 0.80 co 0.1 mn 0.1 o 2 The washing time of the material is 12 minute...

Embodiment 3

[0043] (1) The high-nickel ternary hydroxide precursor Ni with a D50 of 15um prepared by the continuous co-precipitation method 0.9 co 0.06 mn 0.04 (OH) 2 LiNi is obtained by mixing and sintering with fine powder lithium hydroxide with a D50 of 6um at 770°C 0.9 co 0.06 mn 0.04 o 2 material, then for LiNi 0.9 co 0.06 mn 0.04 o 2 The material is crushed and classified into large-size high-nickel ternary material and small-size high-nickel ternary material. The D50 difference between the large-size high-nickel ternary material and the small-size high-nickel ternary material is 14-15um;

[0044] (2), the large size LiNi 0.9 co 0.06 mn 0.04 o 2 Materials and Small Size LiNi 0.9 co 0.06 mn 0.04 o 2 The materials are all stirred and washed, the ratio of water to material is 1.5:1, small size LiNi 0.9 co 0.06 mn 0.04 o 2 The washing time of the material is 12 minutes, and the large size LiNi 0.9 co 0.06 mn 0.04 o 2 The washing time of the material is 20 minute...

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Abstract

The invention discloses a preparation method for a high-nickel ternary material of a lithium ion battery. Firstly, a high-nickel ternary hydroxide precursor prepared in a continuous co-precipitation method and micro-powder lithium hydroxide are mixed and sintered to prepare high-nickel ternary materials; then, the high-nickel ternary materials are graded according to the size, and the graded two-stage materials are respectively subjected to centrifugal dewatering, vacuum drying, coating of nanometer oxide in a dry method, secondary sintering, crushing and degaussing; and finally, the two-stagematerials are fully mixed to obtain the high-nickel ternary material of the lithium ion battery. According to the method in the invention, the high-nickel ternary materials are graded; then, the graded size particles are washed and coated respectively; and finally, the modified high-nickel ternary materials are mixed, thereby eliminating the difference of the high-nickel ternary materials with different particle diameters in the water washing and coating processes.

Description

technical field [0001] The invention relates to the field of lithium-ion battery manufacturing, in particular to a preparation method of a high-nickel ternary material for a lithium-ion battery. Background technique [0002] Due to its high working voltage, energy density, long life and environmental friendliness, lithium-ion batteries have become the power source of a new generation of electric vehicles, electric tools and electronic products, and have been widely used in energy, transportation, communications, etc. in different fields. At the end of 2015, in the "13th Five-Year" new energy vehicle pilot special project issued by the Ministry of Science and Technology, it is required that by 2020, the specific energy of lithium-ion power batteries in my country will reach 300Wh / kg, and even 350Wh / kg. [0003] Ternary materials, especially high-nickel ternary materials, are the current research hotspots, and have been widely used due to their high capacity and excellent cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 高玉仙李道聪陈厚梅陈方
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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