Preparation method of ternary positive electrode material precursor

A technology of cathode materials and precursors, which is applied in the field of preparation of ternary cathode material precursors, can solve the problems of wide particle size distribution of ternary cathode material precursors, and achieve uniform size, improved performance, and good circulation

Inactive Publication Date: 2018-06-08
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the particle size distribution of the ternary positive electrode material precursor prepared by the existing co-precipitation method is relatively wide, and propose a preparation method of the ternary positive electrode material precursor

Method used

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  • Preparation method of ternary positive electrode material precursor
  • Preparation method of ternary positive electrode material precursor
  • Preparation method of ternary positive electrode material precursor

Examples

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Effect test

Embodiment 1

[0026] 1. Preparation of submicron particles: 2.0mol / L MSO 4 (M=Ni, Co, Mn, where the molar ratio of Ni:Co:Mn is 0.8:0.1:0.1) solution and 5.0mol / L NaOH solution were added dropwise to the reaction vessel at a rate of 1ml / min, and at the same time, Nitrogen, under the conditions of pH 11.0 and temperature 55°C, carry out co-precipitation reaction for 1 hour to obtain a mixed solution containing submicron particles;

[0027] 2. Preparation of the precursor of the ternary cathode material: add ammonia water to the mixed solution prepared in step (1) to obtain a reaction solution, and control the concentration of ammonia water in the reaction solution to 0.3mol / L, and continue to add 2.0mol / L of MSO 4 (M=Ni, Co, Mn, where Ni: Co: Mn molar ratio is 0.8: 0.1: 0.1) solution and 5.0mol / L NaOH solution, continue to feed nitrogen, at pH 11.0, temperature 50 ℃ Co-precipitation reaction was carried out under the conditions for 25h. After the reaction was completed, Ni was obtained by f...

Embodiment 2

[0030] 1. Preparation of submicron particles: 2.5mol / L MCl 2 (M=Ni, Co, Mn, where Ni:Co:Mn molar ratio is 0.7:0.1:0.2) solution and 2.0mol / L KOH solution were added dropwise to the reaction vessel at a rate of 2ml / min, and ammonia water was added at the same time , and control the concentration of ammonia water in the solution to be 0.02mol / L, pass nitrogen gas, and carry out co-precipitation reaction for 1 hour under the conditions of pH value of 12.0 and temperature of 25°C to obtain a mixed solution containing submicron particles;

[0031] 2. Preparation of the precursor of the ternary positive electrode material: add ammonia water to the mixed solution prepared in step (1) to obtain a reaction solution, and control the concentration of ammonia water in the reaction solution to 0.1mol / L, and continue to add 2.0mol / L MCl 2 (M=Ni, Co, Mn, where the molar ratio of Ni: Co: Mn is 0.7: 0.1: 0.2) solution and 2.0mol / L KOH solution, continue to feed nitrogen, at pH value 8.0, temp...

Embodiment 3

[0034] 1. Preparation of submicron particles: 1.5mol / L of M(NO 3 ) 2 (M=Ni, Co, Mn, wherein the molar ratio of Ni: Co: Mn is 0.6: 0.2: 0.2) solution and 8.0mol / L KOH solution were added dropwise to the reaction vessel at a rate of 0.5.ml / min, and passed into Nitrogen, under the conditions of pH value 8.0 and temperature 45°C, the co-precipitation reaction was carried out for 3 hours to obtain a mixed solution containing submicron particles;

[0035] 2. Preparation of the precursor of the ternary cathode material: add ammonia water to the mixed solution prepared in step (1) to obtain a reaction solution, and control the concentration of ammonia water in the reaction solution to 0.2mol / L, and continue to add 1.5mol / L of M(NO 3 ) 2 (M=Ni, Co, Mn, where Ni: Co: Mn molar ratio is 0.6: 0.2: 0.2) solution and 8.0mol / L KOH solution, continue to feed nitrogen, at pH 12.0, temperature 80 ℃ Co-precipitation reaction was carried out under the conditions for 15h. After the reaction was...

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Abstract

The invention discloses a preparation method of a ternary positive electrode material precursor. By pertinently adjusting the addition time, addition amount and reaction condition of a reactant in a co-precipitation reaction process, the prepared ternary positive electrode material precursor is more uniform in particle size and narrower in particle size distribution, and a ternary positive electrode material prepared from the ternary positive electrode material precursor is better in cyclicity and has an active effect for improving performances of a lithium ion battery; and the preparation method is simple, reliable, low in cost and suitable for large-scale and commercialized production of the ternary positive electrode material precursor.

Description

technical field [0001] The invention relates to lithium-ion battery positive electrode materials, in particular to a preparation method of a ternary positive electrode material precursor. Background technique [0002] Lithium-ion batteries are currently the most important electrochemical secondary batteries due to their high energy density, better safety performance and lower cost. In lithium-ion batteries, since the cathode material is the only lithium source of the lithium-ion battery, the performance of the cathode material plays a key role in the performance of the lithium-ion battery. In the current commercial cathode material LiCoO 2 , LiMn 2 o 4 、LiFePO 4 、LiNi 1-x-y co x mn y o 2 (Ternary cathode material), because the ternary cathode material has relatively good comprehensive performance, so in the next 2-3 years, the ternary cathode material may become the most important cathode material for power batteries. [0003] At present, the synthesis process of te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/61H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘国标刘昊梅军李绍敏董行
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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