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Silicon-carbon composite material and preparation method thereof

A silicon-carbon composite material, a technology for the preparation process, applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, to achieve the effect of enhancing interaction, improving electrical conductivity, and improving electrochemical performance

Inactive Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene / silicon / carbon nanotube composite material provided by this patent still has the problem of the close combination of carbon materials and silicon, which has certain limitations

Method used

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  • Silicon-carbon composite material and preparation method thereof
  • Silicon-carbon composite material and preparation method thereof
  • Silicon-carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Disperse 0.15 g of silicon nanospheres with a particle size of less than 100 nm in 30 ml of absolute ethanol, add polyvinylpyrrolidone dispersant with a mass of 10% of the silicon nanospheres to aid in dispersion, and ultrasonicate at 50 Hz for 10 minutes;

[0050] (2) Dissolve 0.75g of graphite in 10ml of absolute ethanol, and ultrasonicate at 50Hz for 10min;

[0051] (3) Dissolve 1.5g of carbon quantum dots in 10ml of absolute ethanol, and ultrasonicate at 50Hz for 10min;

[0052] (4) Add the dispersed nanospheres and graphite into the solution containing carbon quantum dots, and mix evenly with 50Hz ultrasonic wave for 10min, then move to a water bath at 80°C, and evaporate the anhydrous ethanol while stirring to obtain the solid content After 90%-97% slurry, vacuum dry at 80°C for 12h;

[0053] (5) After the above-mentioned dried material is ground, heated to 600° C. for 3 hours at a rate of 5° C. min under an Ar gas atmosphere to obtain a silicon-carbon compos...

Embodiment 2

[0056] (1) Disperse 0.25 g of silicon nanospheres with a particle size of less than 100 nm in 30 ml of absolute ethanol, add polyvinylpyrrolidone dispersant with a mass of 10% of the silicon nanospheres to aid in dispersion, and ultrasonicate at 50 Hz for 10 minutes;

[0057] (2), 1.5g of citric acid was dissolved in 10ml of absolute ethanol, 50Hz ultrasonic 10min;

[0058] (3) Dissolve 1.5g of carbon quantum dots in 10ml of absolute ethanol, and ultrasonicate at 50Hz for 10min;

[0059] (4) Add the dispersed nanospheres and citric acid into the solution containing carbon quantum dots, and after mixing evenly with 50 Hz ultrasound for 10 min, move it to a water bath at 80 ° C, and evaporate the absolute ethanol therein under stirring to obtain a solid After the slurry with a content of 90%-97%, vacuum dry at 80°C for 10h;

[0060] (5) After grinding the above-mentioned dried materials, heat them to 600° C. for 3 hours at a rate of 5° C. min- under an Ar gas atmosphere to obta...

Embodiment 3

[0063] (1) Disperse 0.15 g of silicon nanospheres with a particle size of less than 100 nm in 30 ml of absolute ethanol, add polyvinylpyrrolidone dispersant with a mass of 10% of the silicon nanospheres to aid in dispersion, and ultrasonicate at 50 Hz for 10 minutes;

[0064] (2), 1.2g of glucose was dissolved in 10ml of absolute ethanol, 50Hz ultrasonic 10min;

[0065] (3) Dissolve 2.0g of carbon quantum dots in 10ml of absolute ethanol, and ultrasonicate at 50Hz for 10min;

[0066] (4) Add the dispersed nanospheres and glucose into the solution containing carbon quantum dots, and after mixing evenly with 50 Hz ultrasound for 10 minutes, move it to a water bath at 80 ° C, evaporate the absolute ethanol in it, and obtain a solution with a solid content of 90 After %-97% slurry, vacuum dry at 80°C for 14h;

[0067] (5) After the above-mentioned dried materials are ground, they are heated at 5°C min under an Ar atmosphere. -1 Heating at a rate of 800°C for 3 hours to obtain a ...

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Abstract

The invention provides a silicon-carbon composite material and a preparation method thereof. A specific preparation process comprises the following steps: (1) respectively dispersing nano silicon, a carbon source and quantum dots with a solvent through ultrasonic treatment for later use; (2) respectively adding the dispersed nano silicon solution and carbon source solution into the quantum dot solution for ultrasonic mixing, then evaporating the solvent to obtain slurry with a solid content of 90 to 97 percent, and drying the slurry in vacuum for later use; (3) grinding the material obtained in Step (2), and heating and calcining the material in an inert gas atmosphere, thus obtaining the silicon-carbon composite material. By use of the high dispersity of carbon quantum dots or graphene quantum dots in water and absolute ethyl alcohol and rich functional groups on the surfaces, silicon and organic matters or graphite are tightly combined together; and by uniform coating of the siliconwith a pyrolysis product obtained by high-temperature calcining, the problem of volume expansion of a silicon-based material in a cyclic process is effectively relieved, and the electrochemical property of the material is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a silicon-carbon composite material and a preparation method thereof. Background technique [0002] Commercial lithium-ion batteries are widely used in electric vehicles, hybrid vehicles, mobile phones, portable electronic devices, etc. Graphite is used as an anode material for commercial lithium-ion batteries, with a theoretical specific capacity of 372mAh g -1 , can no longer meet people's growing demand for high energy density and high power density lithium-ion batteries. Silicon is the second largest element in the earth's crust, second only to oxygen, and is rich in resources. In addition, silicon also has a low lithium extraction potential and a high theoretical specific capacity (4200mAh g -1 ) and other advantages, it is expected to become a new generation of commercial lithium-ion battery anode materials. However, silicon has a hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 尹周澜李广超郭华军李新海王志兴彭伟佳王接喜彭文杰胡启阳
Owner CENT SOUTH UNIV
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