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A kind of ternary single crystal cathode material and its preparation method and application

A technology of positive electrode materials and single crystal materials, which is applied in the field of ternary single crystal positive electrode materials and its preparation, can solve the problems of increased contact area between materials and electrolyte, intensified side reactions of electrolyte, and secondary particle crushing, etc., to achieve improved Effects of processability and cycle stability, reduction of surface transfer resistance, and improvement of surface properties

Active Publication Date: 2022-01-07
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Studies have shown that with the increase of the number of cycles, the primary particles in the secondary ball have different crystal plane orientations and slip planes, and the anisotropy of lattice expansion and contraction between crystal grains leads to the increase of the number of cycles. In the later stage of the cycle, the secondary particles may be broken and microcracks will be generated between the primary particles, which will increase the contact area between the material and the electrolyte, aggravate the side reaction with the electrolyte, and cause serious capacity fading

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  • A kind of ternary single crystal cathode material and its preparation method and application
  • A kind of ternary single crystal cathode material and its preparation method and application
  • A kind of ternary single crystal cathode material and its preparation method and application

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Embodiment 1

[0050] A ternary single crystal cathode material whose chemical formula is LiNi 0.8 Co 0.1 Mn 0.1 BO 2 .

[0051] A preparation method of a ternary single crystal positive electrode material, comprising the following steps:

[0052] (1) Mix the ternary polycrystalline fine powder by coulter for 1 hour to obtain the fine powder raw material, put the fine powder raw material into the box furnace, under the condition that the oxygen pressure of 0.2MPa and the volume concentration of the oxygen atmosphere are 50-99.9% , the heating rate is 3°C / min, the temperature is raised to 820°C, a sintering is performed, the temperature is kept for 12h, the temperature is lowered to 500°C, the cooling rate is 2°C / min, and the intermediate is naturally cooled to room temperature;

[0053] (2) Pulverize the intermediate through a fluidized bed jet mill to obtain a single crystal material with a particle size distribution of D50=2.6-3.4 μm and D99<10.0 μm, and wash the single crystal materia...

Embodiment 2

[0057] A ternary single crystal cathode material whose chemical formula is LiNi 0.8 Co 0.1 Mn 0.1 BO 2 .

[0058] A preparation method of a ternary single crystal positive electrode material, comprising the following steps:

[0059] (1) Mix the ternary polycrystalline fine powder by coulter for 1 hour to obtain the fine powder raw material, put the fine powder raw material into the box furnace, and under the air pressure of 0.2MPa, the heating rate is 3 ℃ / min, and the temperature is raised to 820 ℃ , carry out a sintering, keep the temperature for 12h, cool down to 500°C, the cooling rate is 2°C / min, and naturally cool to room temperature to obtain an intermediate;

[0060] (2) Pulverize the intermediate through a fluidized bed jet mill to obtain a single crystal material with a particle size distribution of D50=2.6-3.4 μm and D99<10.0 μm, and wash the single crystal material with water, centrifugal drying, and the mass ratio of pure water to material It is 2.0:1, the was...

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Abstract

The invention discloses a ternary single crystal positive electrode material and its preparation method and application. The preparation method comprises the following steps: mixing ternary polycrystalline micropowder, raising the temperature, performing the first sintering, and lowering the temperature to obtain an intermediate; Carry out jet crushing of the body to obtain a single crystal material, wash with water, centrifuge, and dry to obtain a material with a residual alkali content of less than 1500ppm; add the coating agent to the material, heat up, perform a second sintering, and cool down to obtain a ternary single crystal Cathode material. The invention utilizes airflow pulverization equipment to break polycrystalline materials into small single crystal particles, thereby improving the electrochemical performance of the materials and increasing the energy density of the materials.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a ternary single crystal positive electrode material and a preparation method and application thereof. Background technique [0002] As electric vehicles have higher and higher requirements for cruising range, ternary cathode materials with higher Ni content (such as NCM811) have become the focus of research, and people generally call this ternary cathode material with Ni content greater than 0.6 It is a "high-nickel ternary cathode material". The Ni content of this material is relatively high, and the energy density can meet the short-term market demand to a certain extent, relieve the battery life anxiety of electric vehicles, and because the cobalt content is relatively low, it has better performance. cost advantage. In the production of ternary cathode materials, some by-products will inevitably appear, for example, 1-10% of fine powder w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B1/10H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC30B29/22C30B1/10H01M4/366H01M4/505H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10H01M4/62H01M4/0471
Inventor 李飞龙阮丁山韩帅马文柱王雀乐方庆城李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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