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a lini 0.6 co 0.2 mn 0.2 o 2 preparation method

A solvent and suspension technology, applied in the field of ternary cathode material preparation, can solve the problems of difficulty in ensuring particle morphology and size, affecting the electrochemical performance of materials, etc., and achieve the effect of improving electrochemical performance.

Inactive Publication Date: 2021-02-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But regarding the preparation of LiNi 0.6 co 0.2 mn 0.2 o 2 The liquid-assisted solid-phase synthesis has not been proposed yet, and the liquid-assisted solid-phase synthesis also has problems such as difficulty in ensuring the control of particle morphology and size, which affects the further improvement of the electrochemical performance of the material.

Method used

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  • a lini <sub>0.6</sub> co <sub>0.2</sub> mn <sub>0.2</sub> o <sub>2</sub> preparation method
  • a lini <sub>0.6</sub> co <sub>0.2</sub> mn <sub>0.2</sub> o <sub>2</sub> preparation method
  • a lini <sub>0.6</sub> co <sub>0.2</sub> mn <sub>0.2</sub> o <sub>2</sub> preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of LiNi 0.6 co 0.2 mn 0.2 o 2 The preparation method comprises the following steps:

[0049] S1. Weigh Ni(OH) with a molar ratio of 9:1:3 2 ·H 2 O. Co 3 o 4 and MnSO 4 ·H 2 O, obtain initial reactant, standby;

[0050] S2. Get oxalic acid and deionized water and mix evenly to obtain a mixed solution for subsequent use; wherein, oxalic acid, Ni(OH) 2 ·H 2 O. Co 3 o 4 , and MnSO 4 ·H 2 The molar ratio of O is 15:9:1:3;

[0051] S3. Mix the initial reactant, PVP and deionized water evenly, and heat to 50° C. to obtain suspension I; wherein, the mass ratio of PVP to the initial reactant is 0.016:1;

[0052] S4. In the state of magnetic stirring, drop the mixed solution into the suspension I through a constant flow pump at a flow rate of 80mL / h, and continue stirring for 2h to obtain the suspension II;

[0053] S5. Suspension II was suction filtered, washed, and vacuum-dried at 80°C for 10 hours to obtain a precursor;

[0054] S6. Take LiOH H with a ...

Embodiment 2

[0058] A kind of LiNi 0.6 co 0.2 mn 0.2 o 2 The preparation method comprises the following steps:

[0059] S1. Weigh Ni(OH) with a molar ratio of 9:1:3 2 ·H 2 O. Co 3 o 4 and MnSO 4 ·H 2 O, obtain initial reactant, standby;

[0060] S2. Get oxalic acid and deionized water and mix evenly to obtain a mixed solution for subsequent use; wherein, oxalic acid, Ni(OH) 2 ·H 2 O. Co 3 o 4 , and MnSO 4 ·H 2 The molar ratio of O is 15:9:1:3;

[0061] S3. Mix the initial reactant, PVP and deionized water evenly, and heat to 50° C. to obtain suspension I; wherein, the mass ratio of PVP to the initial reactant is 0.012:1;

[0062] S4. In the state of magnetic stirring, drop the mixed solution into the suspension I through a constant flow pump at a flow rate of 80mL / h, and continue stirring for 2h to obtain the suspension II;

[0063] S5. Suspension II was suction filtered, washed, and vacuum-dried at 80°C for 10 hours to obtain a precursor;

[0064] S6. Take LiOH H with a ...

Embodiment 3

[0068] A kind of LiNi 0.6 co 0.2 mn 0.2 o 2 The preparation method comprises the following steps:

[0069] S1. Weigh Ni(OH) with a molar ratio of 9:1:3 2 ·H 2 O. Co 3 o 4 and MnSO 4 ·H 2 O, obtain initial reactant, standby;

[0070] S2. Get oxalic acid and deionized water and mix evenly to obtain a mixed solution for subsequent use; wherein, oxalic acid, Ni(OH) 2 ·H 2 O. Co 3 o 4 , and MnSO 4 ·H 2 The molar ratio of O is 15:9:1:3;

[0071] S3. Mix the initial reactant, PVP and deionized water evenly, and heat to 50° C. to obtain suspension I; wherein, the mass ratio of PVP to the initial reactant is 0.020:1;

[0072] S4. In the state of magnetic stirring, drop the mixed solution into the suspension I through a constant flow pump at a flow rate of 80mL / h, and continue stirring for 2h to obtain the suspension II;

[0073] S5. Suspension II was suction filtered, washed, and vacuum-dried at 80°C for 10 hours to obtain a precursor;

[0074] S6. Take LiOH H with a ...

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Abstract

The invention relates to the technical field of preparation of ternary cathode materials, and discloses a LiNi 0.6 co 0.2 mn 0.2 o 2 The preparation method comprises the following steps: S1. take Ni(OH) 2 ·H 2 O. Co 3 o 4 and MnSO 4 ·H 2 O, to obtain the initial reactant, and set aside; S2. Mix oxalic acid and solvent I to obtain a mixed solution, and set aside; S3. Take PVP, solvent II and the initial reactant, mix evenly, and heat treatment to obtain suspension I; S4. In the state of stirring, the mixed solution is added dropwise to the suspension I, and the suspension II is obtained after stirring; S5. The suspension II is subjected to suction filtration, washing and vacuum drying to obtain a precursor; S6. Take LiOH· h 2 O is mixed with the precursor and ground to obtain a mixture; S7. the mixture is calcined, cooled and ground once to obtain an intermediate product; S8. the intermediate product is calcined and cooled again to obtain LiNi 0.6 co 0.2 mn 0.2 o 2 ; The present invention regulates the crystal morphology through PVP, and utilizes the uniform mixing assisted by the liquid phase to achieve the effect of controlling the particle morphology and size and improving the electrochemical performance of the material.

Description

technical field [0001] The invention relates to the technical field of preparation of ternary cathode materials, specifically a LiNi 0.6 co 0.2 mn 0.2 o 2 method of preparation. Background technique [0002] LiNi 0.6 co 0.2 mn 0.2 o 2 (622), as a ternary cathode material with good comprehensive performance, its capacity ratio is higher than that of LiNi 0.5 co 0.2 mn 0.3 o 2 (523) The material is further improved; its structural stability and anion mixing degree are better than LiNi 0.8 co 0.1 mn 0.1 o 2 (811), has become one of the mainstream products of ternary cathode materials, and has broad application prospects. In actual production, high-performance LiNi is prepared for mass production 0.6 co 0.2 mn 0.2 o 2 , there is a need for simple and effective preparation methods and approaches. [0003] Currently preparing LiNi 0.6 co 0.2 mn 0.2 o 2 The most important methods are liquid phase method and solid phase method. Among them, the liquid-phase m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/30C01P2004/62C01P2006/40H01M4/505H01M4/525Y02E60/10
Inventor 江奇彭俊棋卢晓英
Owner SOUTHWEST JIAOTONG UNIV