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A method for preparing a modified ternary cathode material combined with cerium doping and carbon coating

A cathode material and carbon coating technology, which is applied in the field of preparation of modified ternary cathode materials by combining cerium doping and carbon coating, can solve the problems of restricting the development of lithium-ion batteries, low electronic conductivity, poor cycle performance, etc. , to achieve the effect of reducing the first irreversible capacity loss, optimizing the preparation process, and improving the charge and discharge performance

Active Publication Date: 2020-06-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ternary cathode materials have defects of low rate capacity, low electronic conductivity, mixed cations, and poor cycle performance, which limit the development of lithium-ion batteries.

Method used

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  • A method for preparing a modified ternary cathode material combined with cerium doping and carbon coating

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Effect test

Embodiment 1

[0025] A method for preparing a modified ternary positive electrode material in combination with cerium doping and carbon coating proposed by the present invention comprises the following steps:

[0026] S1, the NiSO 4 , MnSO 4 、CoSO 4 , Ce(NO 3 ) 3 Prepare a uniformly mixed solution with a molar ratio of 5:5:4:1, then slowly add it dropwise into the NaOH solution, stir for 2 hours under the system of pH=11, let it settle, filter, wash with water until neutral, and Dry at 100°C for 30 hours to obtain the precursor of the positive electrode material;

[0027] S2. Mix the positive electrode material precursor and LiOH in absolute ethanol, and use a planetary ball mill for ball milling. The grinding medium is agate balls. The ball milling speed is 200r / min, the ball milling time is 4h, and then the heating rate is 5°C / min. Raise the temperature to 500°C and keep it warm for 10 hours to obtain the activated material; among them, the Ni in the precursor of the positive electro...

Embodiment 2

[0030] A method for preparing a modified ternary positive electrode material in combination with cerium doping and carbon coating proposed by the present invention comprises the following steps:

[0031] S1, the NiSO 4 , MnSO 4 、CoSO 4 , Ce(NO 3 ) 3 Prepare a uniformly mixed solution with a molar ratio of 15:4:9:2, then slowly add it dropwise into the NaOH solution, stir for 2 hours under the system of pH=11, let it settle, filter, wash with water until neutral, and Dry at 100°C for 30 hours to obtain the precursor of the positive electrode material;

[0032] S2. Mix the positive electrode material precursor and LiOH in absolute ethanol, and use a planetary ball mill for ball milling. The grinding medium is agate balls. The ball milling speed is 200r / min, the ball milling time is 4h, and then the heating rate is 5°C / min. Raise the temperature to 500°C and keep it warm for 10 hours to obtain the activated material; among them, the Ni in the precursor of the positive electr...

Embodiment 3

[0035] A method for preparing a modified ternary positive electrode material in combination with cerium doping and carbon coating proposed by the present invention comprises the following steps:

[0036] S1, the NiSO 4 , MnSO 4 、CoSO 4 , Ce(NO 3 ) 3 Prepare a uniformly mixed solution with a molar ratio of 24:1:3:2, then slowly add it dropwise into the NaOH solution, stir for 2 hours under the system of pH=11, let it settle, filter, wash with water until neutral, and Dry at 100°C for 30 hours to obtain the precursor of the positive electrode material;

[0037] S2. Mix the positive electrode material precursor and LiOH in absolute ethanol, and use a planetary ball mill for ball milling. The grinding medium is agate balls. The ball milling speed is 200r / min, the ball milling time is 4h, and then the heating rate is 5°C / min. Raise the temperature to 500°C and keep it warm for 10 hours to obtain the activated material; among them, the Ni in the precursor of the positive electr...

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Abstract

The invention discloses a preparation method of a cerium doping and carbon coating combined modified ternary positive electrode material, wherein the preparation method comprises the following steps:S1, preparing a mixed solution from NiSO4, MnSO4, CoSO4 and Ce(NO3)3, then adding the mixed solution to a NaOH solution, stirring, carrying out static precipitation, filtering, washing to neutral withwater, and drying, to obtain a positive electrode material precursor; S2, mixing the positive electrode material precursor with LiOH in anhydrous ethanol, and then carrying out activating treatment after ball milling, to obtain an activated material; and S3, calcining the activated material, carrying out carbon coating on the surface of the activated material in the calcination process, to obtainthe cerium doping and carbon coating combined modified ternary positive electrode material. The preparation method of the cerium doping and carbon coating combined modified ternary positive electrodematerial can effectively stabilize a layered structure of the ternary positive electrode material, the cation mixed arrangement is inhibited, and the ratio capacity, cycling performance, electronic conductivity and other properties of the ternary positive electrode material are improved.

Description

technical field [0001] The invention relates to the technical field of battery cathode materials, in particular to a method for preparing a modified ternary cathode material combined with cerium doping and carbon coating. Background technique [0002] Energy shortage and environmental pollution are two major problems facing the world today. Vigorously developing renewable energy and developing new energy vehicles are effective ways to solve these two problems, and efficient energy storage systems are the key to realizing these two ways. Lithium-ion batteries have become the most popular energy storage systems due to their high energy density, long life, and environmental friendliness. [0003] The key to the development of lithium-ion batteries is to seek battery materials with high energy density, high safety, environmental friendliness and low price, and cathode materials play a decisive role in the development of lithium-ion batteries. Among many lithium-ion cathode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/366Y02E60/10
Inventor 郝虹阳厉运杰王世旭宋红芳荆孟娜张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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