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A kind of liquid phase coating modification prepares the method for negative electrode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of capacity decay, consumption, cycle performance decline, etc., to prevent dissociation, high cycle efficiency, and improve cycle performance. Effect

Active Publication Date: 2021-09-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compatibility between graphite and organic solvent electrolyte is very poor, so that too much SEI film is formed on the surface of the negative electrode material. Excessive SEI film not only consumes a large amount of lithium, but also causes a large irreversible capacity loss, and also increases the interface impedance. Cause electrochemical kinetic barriers, dissociate and even peel off the graphite layer, resulting in capacity fading and cycle performance degradation

Method used

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  • A kind of liquid phase coating modification prepares the method for negative electrode material of lithium ion battery

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Effect test

Embodiment 1

[0025] A method for preparing lithium-ion battery negative electrode materials by liquid-phase coating modification, comprising the following steps:

[0026] S1. Mechanically pulverize the natural flake graphite, and then classify the pulverized fine powder according to the particle size to obtain a natural flake graphite powder with a particle size of 5-20 μm and a purity of 99.5%;

[0027] S2. Weigh 3g of medium-temperature coal tar pitch and add it to 97g of toluene, stir at high speed (2000rad / min) for 20min to dissolve the pitch more fully, and prepare a medium-temperature coal tar pitch solution with a mass fraction of 3%; then, pour the prepared pitch solution Put it into a static settling tank and let it stand for 6 hours to make the insoluble matter in the solution fully settle and then take the supernatant to prepare the coating solution;

[0028] S3, add 10g of natural flake graphite powder prepared in step S1 into the impregnation kettle, vacuumize the impregnation...

Embodiment 2

[0033] A method for preparing lithium-ion battery negative electrode materials by liquid-phase coating modification, comprising the following steps:

[0034] S1. Mechanically pulverize the natural flake graphite, and then classify the pulverized fine powder according to the particle size to obtain a natural flake graphite powder with a particle size of 10-25 μm and a purity of 99.6%;

[0035] S2. Weigh 6g of high-temperature coal tar pitch and add it to 94g of pyridine, stir at high speed (1000rad / min) for 30min to dissolve the pitch more fully, and obtain a high-temperature coal tar pitch solution with a mass fraction of 6%; then, pour the prepared pitch solution Put it in a static settling tank and let it stand for 12 hours, after the insoluble matter in the solution is fully settled, take the supernatant liquid to prepare the coating liquid;

[0036] S3, add 10g of natural flake graphite powder prepared in step S1 into the impregnation kettle, vacuumize the impregnation ket...

Embodiment 3

[0041] A method for preparing lithium-ion battery negative electrode materials by liquid-phase coating modification, comprising the following steps:

[0042] S1. Mechanically pulverize the natural aphanitic graphite, and then classify the pulverized fine powder according to the particle size to obtain a natural aphanitic graphite powder with a particle size of 8-30 μm and a purity of 99.7%;

[0043] S2. Weigh 10g of high-temperature coal tar pitch and add it to 90g of quinoline, stir at high speed (1500rad / min) for 50min to dissolve the pitch more fully, and obtain a high-temperature coal tar pitch solution with a mass fraction of 10%; then, the prepared pitch solution Pour it into a static settling tank and let it stand for 24 hours to allow the insoluble matter in the solution to fully settle and then take the supernatant to obtain a coating solution;

[0044] S3. Add 10 g of natural aphanitic graphite powder prepared in step S1 into the impregnation kettle. After the impreg...

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Abstract

The invention relates to a method for preparing negative electrode materials of lithium-ion batteries by liquid-phase coating modification, which belongs to the technical field of negative electrode materials for lithium-ion batteries. The invention uses asphalt as a coating agent, and fully dissolves the asphalt through a high-solubility organic solvent. Vacuum liquid phase coating technology is used to coat and modify graphite powder. Through centrifugal separation, fluidized bed drying and carbonization technology, a negative electrode material for lithium-ion batteries with uniform particle size and excellent performance is prepared, and its specific capacity reaches 365mAh / g Above, after 200 cycles, the charging specific capacity reaches more than 350mAh / g, the prepared negative electrode material particles are uniform and non-adhesive, the first cycle efficiency is high, and the first cycle efficiency reaches more than 95%.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a method for preparing lithium ion battery negative electrode materials through liquid phase coating modification. Background technique [0002] As a new generation of green and environmentally friendly batteries, lithium-ion batteries have the advantages of high specific energy, low self-discharge, wide application temperature range, no pollution, and no memory effect. They are widely used in mobile phones, notebook computers, and power tools. It is used in aerospace, military, electric vehicles, energy storage and other fields, and has become a research hotspot in the field of new energy. At present, the anode materials of commercial lithium-ion batteries are mainly carbon materials. Graphite materials have the advantages of high specific capacity, good cycle performance, low lithium intercalation and desorption platfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/587H01M10/0525
CPCH01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘占军李国栋田晓冬
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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