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A kind of silicon-doped carbon mesoporous composite fiber and its preparation method

A composite fiber, carbon mesoporous technology, applied in the chemical characteristics of fibers, rayon manufacturing, textiles and papermaking, etc., can solve the problems of uneven mesopore size distribution of nanofibers, small surface area and small pore volume of nanofibers, etc. Achieve the effect of improving electrochemical performance, good porosity controllability, and wide pore size

Active Publication Date: 2019-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, porous carbon nanofibers generally have limitations such as uneven distribution of mesopore diameter, small pore size, small pore volume, and small surface area of ​​nanofibers.

Method used

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  • A kind of silicon-doped carbon mesoporous composite fiber and its preparation method
  • A kind of silicon-doped carbon mesoporous composite fiber and its preparation method
  • A kind of silicon-doped carbon mesoporous composite fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A silicon-doped carbon mesoporous composite fiber is prepared by the following steps:

[0036] (1) Weigh 22 parts by mass of polyaniline and 25 parts by mass of aluminum acetylacetonate in a well-sealed 250mL three-necked flask at 100°C and dissolve 80 parts by mass of N-methylpyrrolidone. For hexaalkyltrimethoxysilane, add 20 parts by mass of 100nm elemental Si powder, and condense with a condenser tube to avoid solvent volatilization during the stirring process. After the reaction of the mixed solution, the solution turns from milky white to a uniform clear brown viscous liquid to make an electrospinning solution;

[0037] (2) Adjust the temperature of the spinning environment to be 40°C and the relative humidity to be 70%, and wrap a layer of aluminum foil on the receiving drum. Use a 20mL syringe to absorb the electrospinning solution prepared above, and adjust the distance from the stainless steel flat needle of the syringe to the receiving cylinder to be 18cm. S...

Embodiment 2

[0049] A silicon-doped carbon mesoporous composite fiber is prepared by the following steps:

[0050] (1) Weigh 8 parts by mass of polystyrene and 0.5 parts by mass of aluminum chloride in a well-sealed 250mL three-necked flask and dissolve them in 40 parts by mass of dimethyl sulfoxide at 100°C, keep the temperature for 0.5h, and continue to drop 0.1 parts by mass γ-Aminopropyltriethoxysilane and 4 parts by mass of 30nm elemental Si powder were added, and condensed with a condenser tube to avoid solvent volatilization during the stirring process. After the mixed solution was reacted for 8 hours, the solution changed from milky white to a uniform clear brown viscous liquid, and an electrospinning solution was made;

[0051] (2) Adjust the temperature of the spinning environment to be 25°C and the relative humidity to be 50%, and wrap a layer of aluminum foil on the receiving drum. Use a 10mL syringe to absorb the electrospinning solution prepared above, and adjust the distanc...

Embodiment 3

[0056] A silicon-doped carbon mesoporous composite fiber is prepared by the following steps:

[0057] (1) Weigh 15 parts by mass of polyacrylonitrile and 13 parts by mass of terephthalic acid in a well-sealed 250mL three-necked flask at 90°C and dissolve 60 parts by mass of N,N-dimethylformamide, keep the temperature for 1.5h, continue Add 0.4 parts by mass of γ-(2,3-glycidoxy)propyltrimethoxysilane and 12 parts by mass of 50nm elemental Si powder dropwise, and condense with a condenser to avoid solvent volatilization during stirring. After the mixed solution was reacted for 9 hours, the solution changed from milky white to a uniform clear brown viscous liquid, and an electrospinning solution was made;

[0058] (2) Adjust the temperature of the spinning environment to be 35°C and the relative humidity to be 60%, and wrap a layer of aluminum foil on the receiving drum. Use a 20mL syringe to absorb the electrospinning solution prepared above, and adjust the distance from the st...

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Abstract

The invention discloses silicon-doped carbon mesoporous composite fiber and a preparation method thereof. The method comprises the following steps: carrying out a reaction among a carbon-based polymer, a pore-foaming agent, a spinning solvent, organosiloxane and monatomic silicon to prepare an electrostatic spinning solution; absorbing the electrostatic spinning solution by the use of an injector to carrying out spinning so as to prepare a nanofiber membrane; putting the nanofiber membrane into a quartz boat, and putting the quartz boat into an open-type vacuum / atmosphere tubular electric furnace; carrying out preoxidation before carbonization in air atmosphere, and carrying out high-temperature carbonization at the temperature of 600-1100 DEG C and under argon protection for 1-4 h so as to obtain the silicon-doped carbon mesoporous composite fiber. BET specific surface area is 350-550 m<2>g<-1>; BJH pore volume is 0.5-0.9 mLg<-1>; and BJH pore diameter is 14-25 nm. The preparation method of the invention is easy to control and has high yield. The prepared product has very important value when applied to high-performance lithium ion battery anode materials.

Description

technical field [0001] The invention relates to a composite fiber material, in particular to a silicon-doped carbon mesoporous composite fiber for lithium-ion battery negative electrode materials and a preparation method thereof; it belongs to the technical field of new energy materials. Background technique [0002] The energy crisis seriously restricts my country's sustainable development, and the development and application of new high-performance energy storage technologies has become one of the effective ways to solve the energy crisis. Lithium-ion batteries have been widely used as various energy storage devices due to their high density of electrical energy, long-lasting charge-discharge cycles, and reasonable voltage performance, and are considered to be the representative of modern high-performance batteries. [0003] However, lithium-ion battery negative electrode materials are currently mostly carbon-based negative electrode materials, due to their theoretical spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/24D01F9/21D01F9/22D01F1/10
CPCD01F1/10D01F9/21D01F9/22D01F9/24
Inventor 文秀芳颜子敏皮丕辉徐守萍程江
Owner SOUTH CHINA UNIV OF TECH