Hollow graphite carbon nanometer sphere in-situ modification amorphous carbon nanometer fibers or carbon nano-tubes and preparation method thereof

A technology of nano-balls and in-situ modification, applied in nano-carbon, fiber treatment, nanotechnology, etc., can solve the problems of low stability and rapid capacity decline, and achieve the effects of good stability, easy operation and novel structure

Active Publication Date: 2013-05-08
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an in-situ modification of amorphous carbon nanofibers by hollow graphite carbon nanospheres in view of the defects of low stability and rapid capacity drop caused by insufficient space of existing carbon nanofibers/carbon nanotubes / carbon nanotube and its preparati

Method used

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preparation example Construction

[0027] The preparation method for in-situ modification of amorphous carbon nanofibers / carbon nanotubes provided by the present invention comprises the following steps:

[0028](1) Preparation of electrospinning solution: use a polar solvent that can stir the transition metal salt and the cyclizable polymer resin into a homogeneous state under stirring conditions to mix and stir the transition metal salt and the cyclizable polymer resin to prepare Uniform electrospinning solution, wherein the weight percentages of the cyclizable polymer resin and the transition metal salt in the electrospinning solution are as follows: the cyclizable polymer resin accounts for the sum of the mass of the cyclizable polymer resin and the polar solvent 5-50%; the transition metal salt accounts for 1-50% of the mass of the cyclizable polymer resin solution. Wherein the cyclizable polymer resin solution is composed of a cyclizable polymer resin and a polar solvent. Therefore, the weight percentage ...

example 1

[0042] 1. Preparation of electrospinning solution: with 7.5g polyvinyl alcohol (PVA), 4g nickel chloride (NiCl 2 ) and 67.5 mL of distilled water were mixed and stirred at 80° C. for a period of time to form a uniform spinning solution.

[0043] 2. Through the electrospinning equipment, at the voltage of 20kV, the distance between the spinneret and the receiving device is 18cm, and the feeding flow rate of the spinning solution is 0.4mL / h, the spinning solution is electrospun to prepare PVA / NiCl 2 Composite nanofiber precursors.

[0044] 3. The prepared PVA / NiCl 2 The composite nanofiber precursor was dried in a vacuum oven (vacuum degree 0.03MPa, temperature 70°C) for 8h.

[0045] 4. PVA / NiCl after drying 2 Composite nanofiber precursors in H 2 / N 2 Calcined at 500°C for 2h under an inert atmosphere. C / Ni composite nanofibers with diameters in the range of 50-100nm are prepared.

[0046] 5. C / Ni composite nanofibers were treated with nitric acid at a temperature of 30°...

example 2

[0049] 1. Preparation of electrospinning solution: with 2.5g PVA, 1.5g nickel acetate (Ni(Ac) 2 ) and 22.5 mL of distilled water were mixed and stirred at 80° C. for a period of time to form a uniform spinning solution.

[0050] 2, by electrospinning equipment, at voltage 17kV, spinneret and receiving device distance 18cm, the feeding flow rate of spinning solution 0.5mL / h, electric discharge above-mentioned spinning solution and prepare PVA / Ni(Ac) 2 Composite nanofiber precursors.

[0051] 3. The prepared PVA / Ni(Ac) 2 The composite nanofiber precursor was dried in a vacuum drying oven (vacuum degree: 0.02MPa, temperature: 70°C) for 8h.

[0052] 4. PVA / Ni(Ac) after drying 2 Composite nanofiber precursors in N 2 Calcined at 500°C for 2h under an inert atmosphere. C / Ni composite nanofibers with diameters in the range of 50-200nm are prepared.

[0053] 5. C / Ni composite nanofibers were treated with hydrochloric acid at a temperature of 25°C for 48h, and then dried in a vacu...

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Abstract

The present invention relates to hollow graphite carbon nanometer sphere in-situ modification amorphous carbon nanometer fibers/carbon nano-tubes and a preparation method thereof. The preparation method comprises the following steps: preparing a spinning solution; preparing and drying a composite nanometer fiber precursor; carrying out carbonization on the composite nanometer fiber precursor to obtain composite nanometer fibers or nano-tubes; and carrying out an acid treatment on the composite nanometer fibers or the nano-tubes, and drying to obtain the hollow graphite carbon nanometer sphere in-situ modification amorphous carbon nanometer fibers/carbon nano-tubes. With the present invention, the carbon nanometer fibers/carbon nano-tubes can be further utilized to prepare an electrode and assemble a lithium ion battery or a supercapacitor. According to the preparation method, the disadvantage of high temperature graphitization required by macromolecule cyclization is overcome, a specific surface area, a conductivity, and capacity for resisting structure destruction due to volume expansion caused by external causes of the composite nanometer fibers/nano-tubes are improved, and the assembled lithium ion battery and the supercapacitor device have characteristics of high capacity, good rate, high stability and the like.

Description

technical field [0001] The invention relates to a carbon nanometer material, in particular to a hollow graphite carbon nanosphere in-situ modified amorphous carbon nanofiber or carbon nanotube and a preparation method thereof. Background technique [0002] With the progress of society and continuous economic development, the demand for non-renewable energy is increasing, which will inevitably lead to the depletion of non-renewable resources such as oil, coal, and natural gas, environmental pollution, and the intensification of the greenhouse effect. For this reason, the development and comprehensive and efficient utilization of new energy, energy-saving technology and environmental technology has become a top priority. It is imperative to develop electronic and electrical products such as electric vehicles, mobile phones, and notebooks. Supercapacitors and lithium-ion batteries have obvious advantages in these fields, and they can meet the requirements of high power, long l...

Claims

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Application Information

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IPC IPC(8): D01F9/21D01F9/145D01F9/24D01F9/26D01F9/22D01F11/12D01D1/02D01D5/00D01D10/02D01D10/06C01B31/02B82Y30/00B82Y40/00H01M4/133H01M10/0525H01G9/042C01B32/15
CPCY02E60/13Y02E60/122Y02E60/10
Inventor 周利民陈育明卢周广黄海涛
Owner THE HONG KONG POLYTECHNIC UNIV
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