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Fabric-shaped carbon-coated silicon dioxide composite material and application

A technology of silica and composite materials, applied in the field of materials, can solve problems such as high cost and complicated preparation process, and achieve the effects of improved electrical conductivity, high safety performance, and low expansion coefficient

Active Publication Date: 2021-07-27
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. A carbon-coated nano-silicon composite material and its preparation method and application (CN106784732B), the present invention is to solve the existing preparation process of reducing the volume effect of silicon-based negative electrode materials by using nanometerization, alloying or porosity complex, costly technical issues

Method used

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  • Fabric-shaped carbon-coated silicon dioxide composite material and application
  • Fabric-shaped carbon-coated silicon dioxide composite material and application
  • Fabric-shaped carbon-coated silicon dioxide composite material and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A fabric-like carbon-coated silica composite material, the preparation steps of which are as follows:

[0061] (1) Uniformly disperse 0.1 g of silica nanoparticles into 10 ml of deionized water by ultrasonic stirring for 30 min to obtain a uniformly dispersed silica suspension.

[0062] (2) After adding cellulose nanofibrils to deionized water, carry out ultrasonic stirring for 30 minutes, and prepare a gelatinous cellulose nanofibril suspension with a concentration of 0.5wt%, and step (1 ) the obtained silica suspension was slowly added to the cellulose nanofibril suspension, and then ultrasonically dispersed for 30 minutes to prepare a silica / cellulose nanofibril mixed solution;

[0063] (3) Freezing the mixed solution prepared in step (2) at -80°C for 8 hours, and then quickly taking it out for freeze-drying treatment for 36 hours to obtain a silica / cellulose nanofibril composite airgel;

[0064] (4) Place the silica / cellulose nanofibril composite airgel in step (3)...

Embodiment 2

[0074] A fabric-like carbon-coated silica composite material, the preparation steps of which are as follows:

[0075] (1) Uniformly disperse 0.1 g of silica nanoparticles into 10 ml of deionized water by ultrasonic stirring for 30 min to obtain a uniformly dispersed silica suspension.

[0076] (2) Add cellulose nanofibrils to deionized water and carry out ultrasonic stirring for 20min to prepare a gelatinous cellulose nanofibril suspension with a concentration of 0.5wt%. Step (1 ) the obtained silica suspension was slowly added to the cellulose nanofibril suspension, and then ultrasonically dispersed for 20 minutes to prepare a silica / cellulose nanofibril mixed solution;

[0077] (3) Freezing the mixed solution prepared in step (2) at -80°C for 6 hours, and then quickly taking it out for freeze-drying treatment for 32 hours to obtain a silica / cellulose nanofibril composite airgel;

[0078] (4) Place the silica / cellulose nanofibril composite airgel in step (3) in a tube furnac...

Embodiment 3

[0084]A fabric-like carbon-coated silica composite material, the preparation steps of which are as follows:

[0085] (1) Uniformly disperse 0.1 g of silica nanoparticles into 10 ml of deionized water by ultrasonic stirring for 30 min to obtain a uniformly dispersed silica suspension.

[0086] (2) After adding the cellulose nanofibrils into deionized water, carry out ultrasonic stirring for 60min, and prepare a gelatinous cellulose nanofibril suspension with a concentration of 0.5wt%, and step (1 ) the obtained silica suspension was slowly added to the cellulose nanofibril suspension, and then ultrasonically dispersed for 60 min to prepare a silica / cellulose nanofibril mixed solution;

[0087] (3) Freezing the mixed solution prepared in step (2) at -80° C. for 10 hours, and then quickly taking it out for freeze-drying treatment for 48 hours to obtain a silica / cellulose nanofibril composite airgel;

[0088] (4) Place the silica / cellulose nanofibril composite airgel in step (3) ...

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Abstract

The invention discloses a preparation method of a fabric-shaped carbon-coated silicon dioxide composite material. The method comprises the following preparation steps of adding cellulose nanofibrils into deionized water, carrying out ultrasonic treatment to obtain a cellulose nanofibril suspension, and uniformly mixing the cellulose nanofibril suspension with silicon dioxide nanoparticles; then freezing and carrying out freeze-drying treatment to obtain silicon dioxide / cellulose nanofibril composite aerogel; and performing carbonization treatment under the protection of an inert gas to obtain the fabric-shaped carbon-coated silicon dioxide composite material. The preparation process is simple, harsh conditions such as high temperature and high pressure are not needed, and when the fabric-shaped carbon-coated silicon dioxide composite material is used as a lithium ion negative electrode material, the fabric-shaped carbon-coated silicon dioxide composite material has a good surface structure, a larger specific surface area and higher specific capacity; meanwhile according to the method, biodegradable cellulose nanofibrils with a low expansion coefficient and a high length-diameter ratio are used as a base material for constructing a carbon network structure, so that the application range of plant fibers is expanded, and the plant fibers are utilized in a high-valued manner.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a fabric-like carbon-coated silicon dioxide composite material and its application. Background technique [0002] Lithium-ion batteries are widely used in electronic equipment, electric vehicles and other fields due to their high energy density and long cycle life. Graphite is the main negative electrode material of commercial lithium-ion batteries, and its theoretical specific capacity is only 372mAh / g, which is difficult to meet the needs of modern production and life. In order to meet the needs of social development, it is of great significance to develop new materials with higher energy density to replace graphite materials. SiO 2 Anode materials have attracted extensive attention due to their high theoretical specific capacity (1965mAh / g) and good cycle stability. However, SiO 2 The disadvantages of low conductivity and easy volume expansion during charging and dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCH01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 侯庆喜罗开盛吴开丽刘苇
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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