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Single-crystal ternary positive electrode material and preparation method and application thereof

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: 2020-09-18
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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  • Single-crystal ternary positive electrode material and preparation method and application thereof
  • Single-crystal ternary positive electrode material and preparation method and application thereof
  • Single-crystal ternary positive electrode material and preparation method and application thereof

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Experimental program
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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 the hydroxide precursor is 1.07:1.0, and 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 materials, each saggar has a charging volume of 4.0kg and an air flow rate of 8m 3 / h, first raise the temperature to 750°C, hold for 5.0h, continue to heat up to 930°C for sintering, hold for 8h, and finally cool down to 30°C, the heating and cooling rate is 2°C / min, and then the single crystal with a D50 of 3.6μm is obtained by jet crushing MaterialLiNi 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 ...

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, and the contents of B and Al are 800ppm and 2000ppm respectively) to obtain a mixed material;

[0061] 2) Carry out the first sintering of the mixed materials, each saggar has a charging volume of 4.0kg and an air flow rate of 8m 3 / h, first raise the temperature to 750°C, hold for 5.0h, continue to heat up to 930°C for sintering, hold for 8h, and finally cool down to 30°C, the heating and cooling rate is 2°C / min, and then get a single crystal with a D50 of 3.6μm through jet crushing The material, the morphology before and after crushing are as follows: figure 1 shown;

[0062] 3) Combine the single crystal material with H 3 BO 3 Mix (the content of ion B is 1...

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 materials, each saggar is filled with 5.0kg, and the air flow is 8m 3 / h, heat up to 700°C, hold for 5.0h, continue to heat up to 930°C for sintering, hold for 9h, and finally cool down to 30°C, the temperature rise and fall rate is 3°C / min, and then the single particle material with D50 of 3.6μm is obtained through jet milling ;

[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) 8m into the ...

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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)CoxMnyMzO2@Ai, wherein M isat least two of Zr, Al, Yb, Sr, La, Y, Ti, Sn, Mo, Si or W; wherein the A is one or two of H3BO3, B2O3, Li2B4O7, Li3PO4, Li2HPO3, LiH2PO4 and H3PO4, and the B is one or two of Li2B4O7, Li3PO4, Li2HPO3, LiH2PO4 and H3PO4; x is larger than 0 and smaller than or equal to 0.2, y is larger than 0 and smaller than or equal to 0.35, z is larger than 0 and smaller than or equal to 0.006, and i is largerthan or equal to 0.0008 and smaller than or equal to 0.008. The single-crystal ternary positive electrode material has the advantages of high power, high cycle, high voltage, high capacity, high energy density, high safety, low price, capability of realizing industrial production and the like.

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 Applications(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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