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Preparation method of carbon nanofiber electrode material based on MOFs derived metal oxide

A carbon nanofiber, electrode material technology, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problem of not taking into account the easy agglomeration of MOFs particles, and achieve an improved reversible specific capacity, easy operation, and environmental friendliness. Effect

Pending Publication Date: 2020-04-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patented technology disclosed above only considers improving the conductivity of MOFs-derived materials in the process of preparing high-performance MOFs-based composite materials, and does not take into account the phenomenon that MOFs particles are easy to agglomerate and the corresponding costs.

Method used

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  • Preparation method of carbon nanofiber electrode material based on MOFs derived metal oxide
  • Preparation method of carbon nanofiber electrode material based on MOFs derived metal oxide
  • Preparation method of carbon nanofiber electrode material based on MOFs derived metal oxide

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Embodiment 1

[0027] A preparation method based on MOFs derived metal oxide carbon nanofiber electrode material, comprising the steps of:

[0028] Step 1: Weigh 1.1158g of zinc nitrate and dissolve it in 30mL of methanol, weigh 1.2337g of 2-methylimidazole and dissolve it in 30mL of methanol, then mix the two solutions and stir for 10-30min to form a white suspension. Finally, after standing and aging at room temperature for 24 hours, centrifuge, wash with methanol and deionized water several times, and vacuum-dry at 70°C to obtain ZIF-8 nanoparticles with a particle size of 100-120nm;

[0029] Step 2: Weigh 0.3g of ZIF-8 nanoparticles and ultrasonically disperse them in 6mL of DMF solution, then add 0.4g of PAN fibers, stir at 70°C for 5h to form a spinning precursor solution, and then spin the spinning precursor The solution was transferred to a 10mL syringe for electrospinning, and the current collector was copper foil. After spinning, a ZIF-8@PAN precursor film was formed, and it was va...

Embodiment 2

[0036] A preparation method based on MOFs derived metal oxide carbon nanofiber electrode material, comprising the steps of:

[0037] Step 1: Weigh 1.1158g of zinc nitrate and dissolve it in 30mL of methanol, weigh 1.2337g of 2-methylimidazole and dissolve it in 30mL of methanol, then mix the two solutions and stir for 10-30min to form a white suspension. Finally, after standing and aging at room temperature for 24 hours, centrifuge, wash with methanol and deionized water several times, and vacuum-dry at 70°C to obtain ZIF-8 nanoparticles with a particle size of 100-120nm;

[0038] Step 2: Weigh 0.4g of ZIF-8 nanoparticles and ultrasonically disperse them in 6mL of DMF solution, then add 0.48g of PAN fiber, stir at 70°C for 5h to form a spinning precursor solution, and then spin the spinning precursor The solution was transferred to a 10mL syringe for electrospinning, and the current collector was copper foil. After spinning, a ZIF-8@PAN precursor film was formed, and it was va...

Embodiment 3

[0045] A preparation method based on MOFs derived metal oxide carbon nanofiber electrode material, comprising the following steps:

[0046] Step 1: Dissolve 0.748g of ferric chloride and 0.46g of terephthalic acid in 60mL of DMF solution and stir for 20-30min to obtain a mixed solution; Heated to 120°C in a hydrothermal reaction kettle, kept warm for 2 hours, cooled to room temperature, centrifuged at a speed of 8000r / min, washed repeatedly with DMF and absolute ethanol, and vacuum dried at 70°C for 12 hours. Obtain MIL-88 nanoparticles with a particle size of 600-700nm;

[0047] Step 2: Weigh 0.3g of MIL-88 nanoparticles and ultrasonically disperse them in 6mL of DMF solution, then add 0.4g of PAN fibers, and stir at 70°C for 5h to form a spinning precursor solution; the spinning precursor solution Transfer to a 10mL syringe for electrospinning. The current collector is copper foil. After spinning, a MIL-88@PAN precursor film is formed. Place it at 60°C for 12 hours in vacuu...

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Abstract

The invention discloses a preparation method of a carbon nanofiber electrode material based on an MOFs derived metal oxide, and belongs to the technical field of lithium ion battery negative electrodematerials. According to the preparation method, an N-N dimethylformamide solution formed by mixing MOFs particles and polyacrylonitrile fibers is adopted as a spinning precursor. The MOFs are connected to the polyacrylonitrile fibers in series through electrostatic spinning, so that a precursor film can be obtained; the MOFs derived metal oxide and carbon nanofiber composite material is preparedthrough subsequent pre-oxidation and carbonization treatment. The MOFs-derived metal oxide can maintain the unique frame structure of the precursor MOF material to be used as a lithium ion memory; thecarbon nanofibers can promote the rapid transfer of electrons so as to improve the conductivity of the electrode material; the metal organic framework (MOFs) derived material (metal oxide) with a unique structure is embedded into the carbon nanofibers, so that a three-dimensional conductive network structure can be formed; and used as a lithium ion battery negative electrode material, the three-dimensional conductive network structure shows relatively high reversible specific capacity and excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a method for preparing a metal oxide carbon nanofiber electrode material derived from MOFs. Background technique [0002] With the continuous development of society, people's demand for energy is increasing, and the shortage of fossil fuel resources and environmental pollution are becoming more and more serious. Therefore, it is imminent to develop new environmentally friendly energy storage systems. As a new type of energy storage device, lithium-ion batteries have attracted extensive attention from researchers because of their high energy density and outstanding cycle performance. The development of lithium-ion batteries is mainly limited by negative electrode materials. The currently commercialized negative electrode materials are mainly graphite. However, the relatively low theoretical specific capacity (372mAh / g) of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/583H01M10/0525
CPCH01M4/362H01M4/583H01M4/52H01M4/48H01M10/0525H01M2004/027Y02E60/10
Inventor 胡宪伟李卓林明石忠宁王兆文高炳亮
Owner NORTHEASTERN UNIV
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