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A kind of fluffy carbon-coated silicon composite material and its preparation method and application

A silicon composite material, carbon coating technology, applied in carbon preparation/purification, nanotechnology for materials and surface science, silicon, etc., can solve problems such as electrode failure, achieve low residual carbon rate, and achieve commercialization , The effect of stable mass production

Active Publication Date: 2022-08-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the huge volume change of silicon as the anode material of lithium-ion batteries during charge and discharge will lead to rapid failure of the electrode.

Method used

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  • A kind of fluffy carbon-coated silicon composite material and its preparation method and application
  • A kind of fluffy carbon-coated silicon composite material and its preparation method and application
  • A kind of fluffy carbon-coated silicon composite material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0033] A preparation method of a fluffy carbon-coated silicon composite material, the specific steps are as follows:

[0034] 100 mg of polyacrylic acid and 66.7 mg of sorbitol were dissolved in a mixed solution consisting of 5 mL of water and 15 mL of ethanol. 200 mg of silicon particles with a particle size of 100 nm were added to the above solution, then stirred for 5 min, sonicated for 30 min, and then placed in a water bath at 80° C. to remove the solvent. After removing the solvent, the material was ground for 10 minutes, placed in an inert atmosphere, heated to 150°C at a heating rate of 5°C / min and kept for 4 hours, and then taken out and ground for 15 minutes after the temperature dropped to <50°C. Disperse 60 mg of the ground powder in 10 mL of ethanol, and then add 100 mg of phenolic resin. The mixture was stirred for 5 min and then sonicated for 10 min, and then placed in a water bath at 80° C. to evaporate the ethanol. After removing the ethanol, the material wa...

Embodiment 2

[0038] A preparation method of a silicon carbon hollow core-shell structure composite material, the specific steps are as follows:

[0039] 200 mg of polyacrylic acid and 133.3 mg of sorbitol were dissolved in a mixed solution consisting of 5 mL of water and 15 mL of ethanol. 200 mg of silicon particles with a particle size of 100 nm were added to the above solution, then stirred for 5 min, sonicated for 30 min, and then placed in a water bath at 80° C. to remove the solvent. After removing the solvent, the material was ground for 10 minutes, placed in an inert atmosphere, heated to 200°C at a heating rate of 5°C / min and kept for 3 hours, then taken out and ground for 15 minutes after the temperature dropped to <50°C. Disperse 60 mg of the ground powder in 10 mL of ethanol, and then add 100 mg of phenolic resin. The mixture was stirred for 5 min and then sonicated for 10 min, and then spread on a polyethylene film at 50° C. to evaporate the ethanol. Since polyethylene will b...

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Abstract

The invention discloses a fluffy carbon-coated silicon composite material and a preparation method and application thereof. First, silicon nano-particles, polyacrylic acid and sorbitol are dispersed in a solvent, and then the silicon nano-particles are coated with a polymer by evaporating the solvent method. A polymer composed of a mixture of acrylic acid and sorbitol, and then placed in an inert atmosphere at a certain temperature to esterify polyacrylic acid and sorbitol into bonds. The esterified polymer is insoluble in solvents such as water or ethanol and has a low carbon residue rate (10.7 wt%). It is very convenient to continue to coat a layer of organic matter with a high carbon residue rate by dispersing it in a suitable solvent, so that a layer of polymer is coated on the surface of the silicon nanoparticle. Finally, in the carbonization process, the inner layer polymer decomposes to generate gas, so that the outer layer polymer forms carbon with a fluffy structure. The fluffy carbon shell is beneficial to alleviate the volume effect of silicon during the charging and discharging process when silicon is used as the anode material of lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a fluffy carbon-coated silicon composite material and a preparation method and application thereof. Background technique [0002] Energy is very important for human survival and development, but the fossil energy resources that humans rely heavily on are limited and polluted. In this regard, it is particularly important to develop clean energy such as wind and solar energy and supporting high-performance energy storage and conversion devices. Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, low self-discharge, and low pollution, and are widely used in automobiles, electric power, railways, communications, and defense. At present, commercial lithium-ion batteries mainly use graphite as the negative electrode material, but its theoretical specific capacity of only 372mAh / g is a major bottleneck for further improving t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525C01B33/02C01B32/05B82Y30/00B82Y40/00
CPCH01M4/625H01M4/386H01M10/0525C01B33/02C01B32/05B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2004/61C01P2004/62Y02E60/10
Inventor 张勇陈鑫洪吴玉程崔接武王岩秦永强舒霞
Owner HEFEI UNIV OF TECH
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