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Ultra-loose graphitized structure porous carbon nanofiber and electrostatic spinning-carbonizing preparation method thereof

A nanofiber and electrospinning technology, which is applied to structural parts, circuits, electrical components, etc., can solve the problems of no carbon nanofiber preparation method, and achieve the effect of simple preparation method, easy reaction conditions and uniform distribution

Active Publication Date: 2016-12-21
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods have improved the porous characteristics and electrochemical performance of porous carbon materials to varying degrees, there is still no carbon nanofiber preparation method that can take into account both the porous structure and graphitized pore walls.

Method used

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  • Ultra-loose graphitized structure porous carbon nanofiber and electrostatic spinning-carbonizing preparation method thereof
  • Ultra-loose graphitized structure porous carbon nanofiber and electrostatic spinning-carbonizing preparation method thereof
  • Ultra-loose graphitized structure porous carbon nanofiber and electrostatic spinning-carbonizing preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.5g of zinc nitrate, 6g of cobalt nitrate, and 1g of urea with an electronic balance, dissolve them in distilled water, react at 110°C for 12 hours, filter and wash with distilled water, and dry at 50°C for 8 hours to obtain ZnCo 2 o 4 precursor, then annealed at 400°C, and ball milled for 3 hours to obtain ZnCo 2 o 4 particles. ZnCo 2 o 4 The XRD image of the particles is shown in figure 1 .

[0033] Weighing ZnCo Accurately with Analytical Balance 2 o 4 and polyacrylonitrile (PAN) powder (where ZnCo 2 o 4 , PAN mass ratio 0.5:2, and the molar mass M of PAN=100000g / mol, mass fraction is 8%) is placed in 20ml sample bottle, utilizes pipette to accurately pipette 10ml of N-N dimethylformamide (DMF) , the sample bottle was sealed with raw material tape, heated to 50 °C, stirred for 36 hours, and finally ZnCo 2 o 4 / PAN uniformly dispersed electrospinning solution.

[0034] Electrospinning equipment was used to prepare nanofibers, and carbonized at 850°...

Embodiment 2

[0037] Take by weighing 1g zinc oxide with electronic balance, 1g tricobalt tetroxide and polyacrylonitrile (PAN) powder (wherein the mass ratio of the three is 1:1:8, and the molar mass M=120000g / mol of PAN) is placed in the 20ml sample bottle, utilizes The pipette accurately pipettes 12ml of N-N dimethylformamide (DMF, PAN accounts for 10% of the mass of DMF), the sample bottle is sealed with raw material tape, heated to 50 ° C, stirred for 36 hours, and finally a uniform electrospun silk liquid.

[0038] Electrospinning equipment is used to prepare nanofibers, which are carbonized at 950°C to obtain cobalt / graphitized porous carbon nanofibers. The SEM scanning electron microscope picture of the porous material that present embodiment makes is shown in Figure 4 .

Embodiment 3

[0040]Weigh 1g of zinc oxide, 0.5g of cobalt oxide and 2g of polyacrylonitrile (PAN) powder (wherein the mass ratio of the three is 2:1:4, and the molar mass M of PAN=140000g / mol) with an electronic balance and dissolve in DMF solution Medium (PAN accounted for 20% of DMF mass) was placed in a 20ml sample bottle, heated to 50°C, and stirred for 36 hours to finally obtain a uniformly dispersed electrospinning solution.

[0041] Electrospinning equipment is used to prepare nanofiber membranes, which are carbonized at 1050°C to obtain super-loose and porous carbon nanofibers.

[0042] The prepared cobalt / porous carbon fibers were cleaned and purified in 3M nitric acid at 100°C and 1 MPa to obtain pure graphitized porous carbon nanofibers. The SEM scanning electron micrograph of the porous material that this example makes is shown in Figure 5 .

[0043] It can be seen from the SEM scanning electron microscope that both Examples 1 and 2 can successfully prepare cobalt / graphitize...

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Abstract

The invention relates to an electrostatic spinning-carbonizing preparation method of an ultra-loose graphitized structure porous carbon nanofiber. The method comprises the following steps that 1, a mixture of zinc oxide and cobalt oxide or a solid solution of zinc oxide and cobalt oxide is ball-milled to prepare an opening agent compound; 2, the opening agent compound obtained in the step 1 is mixed with polyacrylonitrile (PAN), the mixture is dissolved into N-N-dimethylformamide (DMF), and after stirring is conducted, a uniformly-dispersed spinning solution is obtained; 3, the spinning solution obtained in the step 2 is spinned into a nanofiber through an electrostatic spinning method; 4, the nanofiber obtained in the step 3 is carbonized under inert gas shielding, and the cobalt-graphitized structure porous carbon nanofiber is obtained. The preparation method is simple, and the graphitized porous carbon fiber can be obtained at low carbonizing temperature; the prepared material has the advantages that pore size distribution is concentrated and uniform, the morphology is controllable, and the energy storage effect is good.

Description

technical field [0001] The invention relates to the field of lithium-ion battery negative electrode materials, in particular to a porous carbon nanofiber with an ultra-loose graphitized structure and an electrospinning-carbonization preparation method thereof. Background technique [0002] With the development of society and economy, energy and environmental issues have become increasingly prominent, so the search for green and sustainable energy and the development of energy storage technologies equipped with it have attracted much attention. Lithium-ion batteries are widely used in production and life because of their advantages such as greenness, safety, and high capacity. However, the capacity and service life of lithium-ion batteries on the market have not yet met consumer demand. Anode materials are one of the key components that determine the performance of lithium-ion batteries. At present, graphite is the main anode material for commercial lithium-ion batteries, b...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 胡毅陈仁忠程钟灵潘鹏沈祯何霞
Owner ZHEJIANG SCI-TECH UNIV
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