High-nickel positive electrode material, preparation method thereof and application of high-nickel positive electrode material in lithium ion battery

A positive electrode material, high nickel technology, applied in the field of high nickel positive electrode material and its preparation, can solve the problem of high material cost, and achieve the effects of low cost, high compaction density and cost reduction

Pending Publication Date: 2020-11-03
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the material is prepared, the precursor is classified into particle size, and then sintered and modified by mixing lithium respectively. Among them, the preparation process of polycrystalline material is adopted for the primary sintering of particles of large and small sizes, and all need to be washed with water; the cost of materials prepared by this method is relatively low. high

Method used

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  • High-nickel positive electrode material, preparation method thereof and application of high-nickel positive electrode material in lithium ion battery
  • High-nickel positive electrode material, preparation method thereof and application of high-nickel positive electrode material in lithium ion battery

Examples

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Embodiment 1

[0047] This embodiment provides a high-nickel positive electrode material, and the preparation method of the high-nickel positive electrode material includes the following steps:

[0048] The high-nickel hydroxide precursor Ni with D50 of 10 μm and (D90-D10) / D50=0.8 0.85 co 0.1 mn 0.045 Zr 0.005 (OH) 2 Mix it with micronized lithium hydroxide with a D50 of 7 μm at a molar ratio of 1:1.03, and sinter at 770°C for 12 hours to obtain LiNi 0.85 co 0.1 mn 0.045 Zr 0.005 o 2 Material;

[0049] Will LiNi 0.85 co 0.1 mn 0.045 Zr 0.005 o 2 The material is mechanically crushed and sieved, and the particle size of the sintered material is controlled to be consistent with the high-nickel hydroxide precursor; the sieved material is washed with water, the water-material ratio is 1:1, and the washing time is 10 minutes. The material is vacuum-dried after centrifugal dehydration, and the moisture content after drying is 400ppm. The dried material is dry-coated with nano-ZrO 2...

Embodiment 2

[0056] This embodiment provides a high-nickel positive electrode material, and the preparation method of the high-nickel positive electrode material includes the following steps:

[0057] The high-nickel hydroxide precursor Ni with D50 of 15 μm and (D90-D10) / D50=0.8 0.85 co 0.1 mn 0.045 Zr 0.005 (OH) 2 LiNi is obtained by mixing with fine powder lithium hydroxide with a D50 of 7 μm at a molar ratio of 1:1.03 and sintering at 770 °C for 12 hours. 0.85 co 0.1 mn 0.045 Zr 0.005 o 2 Material;

[0058] Will LiNi 0.85 co 0.1 mn 0.045 Zr 0.005 o 2 The material is mechanically crushed and sieved, and the particle size of the crushed and sieved material is consistent with that of the precursor; the sieved material is washed with water, the water-material ratio is 2:1, and the washing time is 5 minutes. Vacuum drying is carried out after centrifugal dehydration, and the moisture content after drying is 500ppm, and the dried material is dry-coated with nano-ZrO 2 , nano-...

Embodiment 3

[0063] This embodiment provides a high-nickel positive electrode material, and the preparation method of the high-nickel positive electrode material includes the following steps:

[0064] The high-nickel hydroxide precursor Ni with D50 of 10 μm and (D90-D10) / D50=0.8 0.9 co 0.05 mn 0.045 Zr 0.005 (OH) 2 Mix with micronized lithium hydroxide with a D50 of 7 μm at a molar ratio of 1:1.03, and mix and sinter at 730°C for 12 hours to obtain LiNi 0.9 co 0.05 mn 0.045 Zr 0.005 o 2 Material;

[0065] Will LiNi 0.9 co 0.05 mn 0.045 Zr 0.005 o 2 The material is crushed and sieved, and the particle size of the sintered material is controlled to be consistent with the high-nickel hydroxide precursor; the sieved material is washed with water, the water-material ratio is 1:2, and the washing time is 1min. Vacuum drying is carried out after centrifugal dehydration, and the moisture content after drying is 300ppm, and the dried material is dry-coated with nano-ZrO 2 , nano-Zr...

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Abstract

The invention provides a high-nickel positive electrode material, a preparation method thereof and an application of a high-nickel positive electrode material in a lithium ion battery. The high-nickelpositive electrode material comprises a large-size high-nickel positive electrode material and a small-size high-nickel positive electrode material, wherein the large-size high-nickel positive electrode material accounts for 50-90% of the total mass of the high-nickel positive electrode material. By controlling the particle size and particle size distribution of a high-nickel hydroxide precursor,two high-nickel positive electrode materials with different particle sizes are obtained and then mixed according to a certain proportion to obtain a final material, the mixed material has higher compaction density, the volume energy density of a battery can be improved, and thus the cost of the battery is reduced. Besides, the selected small-size high-nickel hydroxide precursor does not contain Co element, and washing is not needed in the preparation process, so that the cost is very low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a high-nickel positive electrode material, a preparation method thereof and an application in lithium ion batteries. 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. In recent years, new requirements have been put forward for the energy density of new energy vehicle power battery cells. It is required that the energy density of new energy vehicle power battery cells should reach more than 300Wh / kg, and strive to achieve 350Wh / kg, and the system specific energy strives to reach 260Wh / kg. kg. However, according to the current technical level, the commonly used lithium iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 高玉仙丁楚雄李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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