Preparation method of metal organic framework derived iron sulfide and carbon nano composite material

A metal-organic framework and composite material technology, which is applied in the field of metal-organic framework-derived iron sulfide@carbon nanocomposite preparation, can solve the problems of restricting the application of new energy storage fields, prone to agglomeration, and not taken into account, and achieves increased reversible intercalation. Uniform distribution of sites and products without agglomeration, and the effect of improving charge and discharge capacity

Pending Publication Date: 2020-08-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal-organic frameworks (MOFs) have poor electrical conductivity and are prone to agglomeration between particles, which severely limit their application in the field of novel energy storage.
The patents disclosed above did not take into account the disadvantages of metal-organic frameworks (MOFs) and the corresponding preparation costs.

Method used

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  • Preparation method of metal organic framework derived iron sulfide and carbon nano composite material
  • Preparation method of metal organic framework derived iron sulfide and carbon nano composite material
  • Preparation method of metal organic framework derived iron sulfide and carbon nano composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing a metal-organic framework-derived iron sulfide@carbon nanocomposite material, comprising the following steps:

[0029] Step 1, preparation of iron-based metal-organic framework materials:

[0030] Weigh 1.114g of ferric nitrate and 3.860g of fumaric acid and dissolve them in 80mL of ultrapure water, stir evenly for 20min to obtain an orange transparent mixed solution; then place the mixed solution in a Teflon-lined Carry out hydrothermal reaction at 150°C in a hydrothermal reaction kettle, keep warm for 3 hours, cool to room temperature, then centrifuge at a speed of 8000r / min for 2 minutes, wash with ultrapure water and absolute ethanol for 3 times, and finally cool at 70°C Carry out vacuum drying 10h, obtain the MIL-88 nanoparticle that the average particle size is 750nm spindle shape;

[0031] Step 2, preparation of iron sulfide@carbon nanocomposites:

[0032] Mix the MIL-88 nanoparticles and thiourea obtained in step 1 with a mass ratio of 1...

Embodiment 2

[0035] A method for preparing a metal-organic framework-derived iron sulfide@carbon nanocomposite material, comprising the following steps:

[0036] Step 1, preparation of iron-based metal-organic framework materials:

[0037] Weigh 0.279g of ferric nitrate and 0.968g of fumaric acid and dissolve them in 50mL of ultrapure water, stir evenly for 30min to obtain an orange transparent mixed solution; then place the mixed solution in a Teflon-lined Carry out hydrothermal reaction at 120°C in a hydrothermal reaction kettle, keep warm for 4 hours, cool to room temperature, then centrifuge at a speed of 5000r / min for 5 minutes, then wash with ultrapure water and absolute ethanol for 3 times, and finally cool at 70°C Carry out vacuum drying for 12h to obtain MIL-88 nanoparticles with an average particle size of 750nm spindle shape;

[0038] Step 2, preparation of iron sulfide@carbon nanocomposites:

[0039] MIL-88 nanoparticles and thiourea were mixed according to a mass ratio of 1:...

Embodiment 3

[0042] A method for preparing a metal-organic framework-derived iron sulfide@carbon nanocomposite material, comprising the following steps:

[0043] Step 1, preparation of iron-based metal-organic framework materials:

[0044] Weigh 0.692g of ferric nitrate and 2.414g of fumaric acid and dissolve them in 60mL of ultrapure water, stir evenly for 25min to obtain an orange transparent mixed solution; then place the mixed solution in a Teflon-lined Carry out hydrothermal reaction at 1130°C in a hydrothermal reaction kettle, keep warm for 3 hours, cool to room temperature, then centrifuge at a speed of 7500r / min for 3 minutes, then wash with ultrapure water and absolute ethanol for 3 times, and finally cool at 80°C Carry out vacuum drying 10h, obtain the MIL-88 nanoparticle that the average particle size is 750nm spindle shape;

[0045] Step 2, preparation of iron sulfide@carbon nanocomposites:

[0046] Mix the MIL-88 nanoparticles and thiourea obtained in step 1 with a mass rati...

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Abstract

The invention discloses a preparation method of a metal organic framework derived iron sulfide@carbon nano composite material, and belongs to the technical field of lithium ion battery negative electrode materials. Fumaric acid and nitric acid molten iron are subjected to a hydrothermal reaction to obtain spindle-shaped MIL-88 nanoparticles, and then sulfur doping and calcining are performed to obtain a carbon-coated sulfur-doped core-shell structure iron sulfide@carbon nano composite material. The MIL-88(MOFs)-derived metal sulfide prepared by the preparation method disclosed by the inventionkeeps the frame structure of a precursor, and in the calcining process, an organic ligand in the metal organic framework material MIL-88 is cracked to form the core-shell structure of the carbon-coated iron sulfide core; the structure can inhibit the volume expansion of the electrode material in the charging and discharging process to adjust the integrity of the structure, and the formed activated carbon can improve the conductivity of the electrode material and improve the performance of the battery; and the preparation process has the advantages of low cost, simplicity and convenience in operation, environmental friendliness and the like, and has good realizability.

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-organic framework-derived iron sulfide@carbon nanocomposite material. Background technique [0002] Lithium-ion battery is a new type of energy storage device that is widely used at present. It has the characteristics of high energy density, long cycle life, and high safety in use, and can be used to meet people's growing demand for portable electronic devices. In the lithium-ion battery system, the negative electrode material is one of the key factors affecting the performance of the battery. The current commercialized graphite negative electrode material seriously hinders the further development of lithium-ion batteries due to its low theoretical capacity. Density, low price, green and environmentally friendly new anode materials are currently research hotspots in the field of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525B82Y30/00
CPCH01M4/5815H01M4/628H01M4/625H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 胡宪伟李卓张一帆石忠宁王兆文王耀武
Owner NORTHEASTERN UNIV
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