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

A positive electrode material and single crystal technology, applied in the field of single crystal ternary positive electrode materials and its preparation, can solve the problem of increasing the specific surface area of ​​single crystal ternary positive electrode materials, accelerating capacity fading and surface side reactions, and phase change of the surface structure of positive electrode materials, etc. problems, to achieve the effects of improving electrochemical performance and structural stability, increasing electronic/ionic conductivity, and high energy density

Active Publication Date: 2022-05-17
GUANGDONG BRUNP RECYCLING TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, the limiting factor of lithium-ion batteries is the accompanying capacity fading during cycling and the resulting poor cycle life
The reason for the capacity fading is that on the one hand, the intrinsic structure of the positive electrode active material gradually changes irreversibly with the progress of the cycle; The loss of positive active material leads to capacity fading
In addition, during high-temperature sintering and crushing of lithium-ion single crystal ternary cathode materials, high-temperature calcination will lead to material cation mixing and changes in element valence, which will accelerate capacity decay and surface side reactions; jet crushing increases the number of single crystal ternary cathode materials. The surface defects and specific surface area of ​​the material will cause side reactions such as phase change on the surface structure of the positive electrode material, increased resistance, serious gas production, and increased corrosive substances during the charging and discharging process of the battery.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation method of the single crystal ternary cathode material of this embodiment comprises the following steps:

[0046] 1) The hydroxide precursor Ni 5 co 2 mn 3 (OH) 2 With lithium carbonate, Al 2 o 3 and WO 2 Mixing (the molar ratio of lithium carbonate and hydroxide precursor is 1.07:1.0, the contents of Al and W are 1500ppm and 2000ppm respectively) to obtain a mixed material;

[0047] 2) Carry out the first sintering of the mixed material, the loading amount of each sagger is 4.0㎏, the air flow rate is 8m³ / h, firstly raise the temperature to 750°C, keep it for 5.0h, continue to heat up to 930°C for sintering, keep it for 8h, and finally cool down to 30°C, the heating and cooling rate is 2°C / min, and then the single crystal material LiNi with a D50 of 3.6 μm is obtained through jet milling 0.498 co 0.2 mn 0.3 m 0.002 o 2 , the morphology before and after crushing is as follows figure 1 shown;

[0048] 3) Combining single crystal material with L...

Embodiment 2

[0059] The preparation method of the single crystal ternary cathode material of this embodiment comprises the following steps:

[0060] 1) The hydroxide precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 With lithium hydroxide, B 2 o 3 and Al 2 o 3 Mixing (the molar ratio of lithium hydroxide to the precursor is 1.02:1.0, the contents of B and Al are 800ppm and 2000ppm respectively) to obtain the mixed material;

[0061] 2) Carry out the first sintering of the mixed material, the loading amount of each sagger is 4.0㎏, the air flow rate is 8m³ / h, firstly raise the temperature to 750°C, keep it for 5.0h, continue to heat up to 930°C for sintering, keep it for 8h, and finally cool down to 30°C, the heating and cooling rate is 2°C / min, and then jet milling to obtain a single crystal material with a D50 of 3.6 μm. The morphology before and after crushing is as follows figure 1 shown;

[0062] 3) Combine the single crystal material with H 3 BO 3 Mixing (1000ppm ion B content) yields H...

Embodiment 3

[0066] A method for preparing a single crystal ternary positive electrode material, comprising the steps of:

[0067] (1) The precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 With lithium hydroxide, Y 2 o 3 and TiO 2 Mixing (the molar ratio of lithium hydroxide to the precursor is 1.05:1.0, and the contents of Y and Ti are 1500ppm and 2000ppm respectively) to obtain a mixed material;

[0068] (2) Carry out the first sintering of the mixed material, the loading amount of each sagger is 5.0kg, the air flow rate is 8m³ / h, the temperature is raised to 700°C, kept for 5.0h, continued to be heated to 930°C for sintering, kept for 9h, and finally cooled to 30°C, the heating and cooling rate is 3°C / min, and then jet milling to obtain a single particle material with a D50 of 3.6 μm;

[0069] (3) Combine the single particle material with LiH 2 PO 4 and Li 3 PO 4 mixed (the content of ion B is 1200ppm), to obtain LiH 2 PO 4 and Li 3 PO 4 Co-coated cathode materials;

[0070] (4) In ...

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Abstract

The invention discloses a single crystal ternary positive electrode material, the chemical formula of the single crystal ternary positive electrode material is LiNi (1‑x‑y‑z) co x mn y m z o 2 @A i ; said M is at least two of Zr, Al, Yb, Sr, La, Y, Ti, Sn, Mo, Si or W; said A is H 3 BO 3 , B 2 o 3 , Li 2 B 4 o 7 , Li 3 PO 4 , Li 2 HPO 3 , LiH 2 PO 4 or H 3 PO 4 One or two of them; where 0<x≤0.2, 0<y≤0.35, 0<z≤0.006, 0.0008≤i≤0.008. The single crystal ternary anode material of the invention has the advantages of high power, high cycle, high voltage, high capacity, high energy density, high safety, low price and industrial production.

Description

technical field [0001] The invention belongs to the field of positive electrode materials, and in particular relates to a single crystal ternary positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are considered to be one of the most attractive electrical energy storage devices in modern civilization, especially in the field of electric vehicles, and there is an increasing demand for energy storage devices with good safety performance, high energy density, long cycle life and high power . Among them, higher requirements are put forward for the power performance of the ternary battery when the car starts. [0003] Currently, the limiting factor of lithium-ion batteries is the accompanying capacity fading during cycling and the resulting poor cycle life. The reason for the capacity fading is that on the one hand, the intrinsic structure of the positive electrode active material gradually changes ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C30B29/22C30B1/10
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525C30B29/22C30B1/10H01M2004/021H01M2004/028Y02E60/10
Inventor 朱青林阮丁山刘婧婧汪乾陈平黄国捍李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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