Ternary single crystal positive electrode material as well as preparation method and application thereof

A technology of positive electrode material and single crystal material, which is applied in the field of ternary single crystal positive electrode material and its preparation, can solve the problems of increasing the contact area between the material and the electrolyte, aggravating the side reaction of the electrolyte, and breaking the secondary particles, etc. Processability and cycle stability, effect of reducing surface transfer resistance, improving surface properties

Active Publication Date: 2021-02-02
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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  • Ternary single crystal positive electrode material as well as preparation method and application thereof
  • Ternary single crystal positive electrode material as well as preparation method and application thereof
  • Ternary single crystal positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0050] A kind of ternary single crystal cathode material, its chemical formula is LiNi 0.8 co 0.1 mn 0.1 BO 2 .

[0051] A method for preparing a ternary single crystal cathode material, comprising the following steps:

[0052] (1) The ternary polycrystalline micro-powder is mixed for 1 hour with a coulter to obtain the micro-powder raw material, and the micro-powder raw material is put into a box furnace, under the condition that the oxygen pressure of 0.2 MPa 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 carried out, the temperature is kept for 12 hours, 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) The intermediate is pulverized by 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 the single c...

Embodiment 2

[0057] A kind of ternary single crystal cathode material, its chemical formula is LiNi 0.8 co 0.1 mn 0.1 BO 2 .

[0058] A method for preparing a ternary single crystal cathode material, comprising the following steps:

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

[0060] (2) The intermediate is pulverized by 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 the single crystal material is washed with water and centrifugally dried. The mass ratio of pure water to material The ratio is 2.0:1, the was...

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Abstract

The invention discloses a ternary single crystal positive electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: mixing ternary polycrystalline micro-powder, conducting heating, carrying out first sintering, and conducting cooling to obtain an intermediate; carrying out jet milling on the intermediate to obtain a single crystal material, conducting washing with water, and conducting centrifuging and drying to obtain a material of which the residual alkali content is lower than 1500ppm; and adding a coating agent into the material, conducting heating, conducting sintering for the second time, and conducting cooling to obtain the ternary single crystal positive electrode material. Polycrystalline materials are opened into single crystal small particles by utilizing airflow crushing equipment, so that the electrochemical performance of the materials is improved, and the energy density of the materials is improved.

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 Applications(China)
IPC IPC(8): C30B29/22C30B1/10H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC30B29/22C30B1/10H01M4/366H01M4/505H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
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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