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Hard carbon composite material with long service life and high initial efficiency and preparation method thereof

A composite material and long-life technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as deviation of the bonding force between the cladding layer and the core hard carbon, poor conductivity, and small improvement

Active Publication Date: 2022-07-29
晖阳(贵州)新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high specific surface area of ​​hard carbon and the porous structure of the material itself, the initial efficiency and specific capacity of the material are low, and one of the measures to improve the initial efficiency of the hard carbon material is to coat the surface of the material. At present The coating of the material is mainly to improve the first efficiency of the material by coating the amorphous carbon on the surface of the material, but it has poor electrical conductivity, and the first efficiency improvement is limited.
For example, Chinese patent 202111141095.5 discloses a modified hard carbon composite material and its preparation method and application. It mainly uses nano-titanium carbide to coat titanium carbide and amorphous carbon on the surface of hard carbon, relying on the large interlayer distance of titanium itself and the ionic The characteristics of high conductivity and high specific capacity improve the fast charging performance and low temperature performance of the modified hard carbon composite material. At the same time, the titanium carbide coated on the outer layer can reduce the specific surface area of ​​the hard carbon core and improve the performance First-time efficiency; but its improvement is not large, and the bonding force between the coating layer and the core hard carbon is deviated, which affects the later cycle performance

Method used

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  • Hard carbon composite material with long service life and high initial efficiency and preparation method thereof
  • Hard carbon composite material with long service life and high initial efficiency and preparation method thereof
  • Hard carbon composite material with long service life and high initial efficiency and preparation method thereof

Examples

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Effect test

Embodiment 1

[0014] A preparation method of a long-life, high first-efficiency hard carbon composite material, comprising the following steps:

[0015] (1) 100g hard carbon is added in 500g 1-aminopropyl-3-methylimidazole nitrate ionic liquid, after stirring, obtaining mass concentration is 20% aminated ionic liquid coating hard carbon solution;

[0016] (2) 600g of aminated ionic liquid-coated hard carbon solution was added to 500g of 1,2-dimethyl-3-hydroxyethylimidazole p-toluenesulfonate, and after stirring, 5g of hydrogen peroxide was added to continue stirring, and then Transfer to a high pressure reactor, react at a temperature of 150°C for 3h, vacuum filter (0.05Mpa), and vacuum dry at 80°C for 24h to obtain an ionic liquid-coated hard carbon composite material;

[0017] (3) The ionic liquid-coated hard carbon composite material was moved to a tube furnace, and the temperature was raised to 900 °C for 3 hours at a heating rate of 3 °C / min to obtain a hard carbon composite material. ...

Embodiment 2

[0019] A preparation method of a long-life, high first-efficiency hard carbon composite material, comprising the following steps:

[0020] (1) 100g of hard carbon was added to 500g of 1-aminopropyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt ionic liquid, and after stirring evenly, the obtained mass concentration was 20% aminated ionic liquid package Hard-coated carbon solution;

[0021] (2) Add 600g of aminated ionic liquid-coated hard carbon solution to 500g of 1,2-dimethyl-3-hydroxyethylimidazole bis(trifluoromethanesulfonyl)imide salt ionic liquid, stir evenly, add 1 g of hydrogen peroxide continued to be stirred, then transferred to an autoclave, reacted at a temperature of 120 °C for 6 hours, vacuum filtered (0.05Mpa), and vacuum dried at 80 °C for 24 hours to obtain an ionic liquid-coated hard carbon composite material;

[0022] (3) Transfer the ionic liquid-coated hard carbon composite material to a tube furnace, and heat it up to 700 °C for 6 h at a h...

Embodiment 3

[0024] A preparation method of a long-life, high first-efficiency hard carbon composite material, comprising the following steps:

[0025] (1) 100g of hard carbon is added to 500g of 1-aminopropyl-3-methylimidazolium hexafluorophosphate, and after stirring, obtaining a mass concentration of 20% aminated ionic liquid coating hard carbon solution;

[0026] (2) 600g of aminated ionic liquid-coated hard carbon material was added to 500g of 1-hydroxyethyl-2,3-dimethylimidazolium chloride, and after stirring, 10g of hydrogen peroxide was added to continue stirring, and then transferred to the autoclave , react at 200 °C for 1 h, filter, and vacuum dry at 80 °C for 24 h to obtain ionic liquid-coated hard carbon composites;

[0027] (3) Transfer the ionic liquid-coated hard carbon composite material to a tube furnace, and heat it up to 1100 °C for 1 h at a heating rate of 5 °C / min to obtain a hard carbon composite material.

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Abstract

The invention discloses a preparation method of a long-life high-first-effect hard carbon composite material, which comprises the following steps: adding hard carbon into aminated ionic liquid, uniformly dispersing, adding carboxylated ionic liquid and a catalyst, uniformly dispersing, carrying out chemical reaction in a high-pressure reaction kettle, filtering, drying in vacuum, and carbonizing to obtain the hard carbon composite material. According to the invention, the first efficiency, the power performance and the cycle performance of hard carbon can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a long-life and high-first-efficiency hard carbon composite material, and also relates to a preparation method of the long-life and high-first-efficiency hard carbon composite material. Background technique [0002] Hard carbon is a kind of amorphous carbon that is difficult to graphitize. The interlayer spacing is larger than that of graphite anode, and it has good fast charge and discharge performance, especially excellent low temperature charge and discharge performance. However, due to the high specific surface area of ​​hard carbon and the porous structure of the material itself, the initial efficiency of the material is low and the specific capacity is low. One of the measures to improve the initial efficiency of the hard carbon material is to coat the material surface. The coating of the material mainly improves the first efficiency of the material by...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/62H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 杜辉玉
Owner 晖阳(贵州)新能源材料有限公司
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