Metal organic framework-modified polymer film and preparation method and application thereof

A technology of metal-organic framework and polymer film, which is applied in spinning solution preparation, textile and paper making, electrical components, etc. It can solve the problems of loss of polysulfide barrier effect, lower battery energy density, structural damage, etc., and achieve good electrolysis Liquid wettability and thermal stability, low production cost, and the effect of improving electrochemical performance

Active Publication Date: 2019-10-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a series of problems in these two methods. First, the modified layer on the separator will fall off from the surface of the separator during charging and discharging, thereby destroying the structure and losing its barrier effect on polysulfides. At the same time, the modified layer and the introduction of interlayers will reduce the overall energy density of the battery

Method used

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  • Metal organic framework-modified polymer film and preparation method and application thereof
  • Metal organic framework-modified polymer film and preparation method and application thereof
  • Metal organic framework-modified polymer film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The polyacrylonitrile (PAN) base film of ZIF-67 modification, it comprises the steps:

[0028] 1) Add 1.2g Co(acac) 2 Disperse in 15ml N,N-dimethylformamide;

[0029] 2) Add 1.5 g of polyacrylonitrile powder to the solution obtained in step 1) and heat and stir at 70° C. for 10 hours;

[0030] 3) The solution obtained in step 2) was used for electrospinning for 12 hours to obtain Co 2+ - PAN nanofiber film;

[0031] 4) Put the nanofiber film obtained in step 3) and dimethylimidazole into a vacuum oven at 100° C. for low-pressure chemical vapor deposition for 10 hours to obtain a ZIF-67-PAN nanofiber film.

[0032] 5) The obtained ZIF-67-PAN nanofiber film was directly used as a lithium-sulfur battery separator, and the lithium-sulfur battery was assembled in an argon glove box, and the electrochemical performance test was performed.

[0033] Take this example product ZIF-67-PAN film as an example, figure 1 is the X-ray diffraction pattern, it can be seen that Co 2...

Embodiment 2

[0037] The polyvinylidene fluoride (PVDF) base film of ZIF-67 modification, it comprises the steps:

[0038] 1) Add 1.2g Co(acac) 2 Disperse in 15ml N,N-dimethylformamide;

[0039] 2) Add 1.8 g of polyvinylidene fluoride film powder to the solution obtained in step 1) and heat and stir at 65° C. for 8 hours;

[0040] 3) The solution obtained in step 2) was used for electrospinning for 14 hours to obtain Co 2+ - PAN nanofiber film;

[0041] 4) Put the nanofiber film obtained in step 3) and dimethylimidazole into a vacuum oven at 100° C. for low-pressure chemical vapor deposition for 8 hours to obtain a ZIF-67-PVDF nanofiber film.

[0042] 5) The obtained ZIF-67-PVDF nanofiber film was directly used as a lithium-sulfur battery separator, and the lithium-sulfur battery was assembled in an argon glove box, and the electrochemical performance test was performed.

[0043]From the obtained ZIF-67-PVDF film, it can be seen that the nanofibers that make up the film are uniform in s...

Embodiment 3

[0045] The polyimide (PI) base film of ZIF-67 modification, it comprises the steps:

[0046] 1) 1.5g Co(NO 3 ) 2 ·6H 2 O was dispersed in 15ml N,N-dimethylformamide;

[0047] 2) Add 1.8 g of polyimide powder to the solution obtained in step 1) and heat and stir at 80° C. for 8 hours;

[0048] 3) The solution obtained in step 2) was used for electrospinning for 12 hours to obtain Co 2+ - PI nanofiber film;

[0049] 4) Put the double-layer nanofiber film obtained in step 3) and dimethylimidazole into a vacuum oven at 120° C. for low-pressure chemical vapor deposition for 10 hours to obtain a ZIF-67-PI film.

[0050] 5) The obtained ZIF-67-PI nanofiber film was directly used as a lithium-sulfur battery separator, and the lithium-sulfur battery was assembled in an argon glove box, and the electrochemical performance test was performed.

[0051] From the obtained ZIF-67-PI film, it can be seen that the nanofibers that make up the film are uniform in size, with a diameter of a...

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Abstract

The invention relates to a method of preparing a metal organic framework-modified polymer film based on electrostatic spinning. The method is characterized in that various metal organic frameworks areapplied to modify the surface of polymer nano fibers prepared by electrostatic spinning, and allowing the metal organic frameworks to grow in situ on the surface of the polymer nano fibers to form acomplete composite structure, wherein the polymer film is 80-200 mu m in thickness and the metal organic frameworks are 50-100 nm in particle size. The method of the invention has the advantages thata polyacrylonitrile-based nano fiber film has good electrolyte wetting property and thermal stability; the metal organic frameworks on the surface of the nano fibers can adsorb polysulfides effectively and inhibit aero effect of a lithium-sulfur battery; these features enable the cycle stability and rate performance of the lithium-sulfur battery to be improved when the film is applied to lithium-sulfur battery diaphragms; the method is simple, low in production cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to a battery diaphragm material, in particular to a method for preparing a metal-organic framework-modified polymer film based on electrospinning. Background technique [0002] With the development of mobile portable devices and electric vehicles, higher requirements are placed on the performance of energy storage devices. The development of traditional lithium-ion battery systems has reached a bottleneck, and it is difficult to make further breakthroughs in energy density. In order to meet the development needs of the new era, it is imminent to study new battery systems. Lithium-sulfur batteries have a higher theoretical capacity (1675mAh g -1 ) and energy density (2573 Wh kg -1 ), and sulfur also has the advantages of low cost and environmental friendliness, making it widely studied. However, the development of lithium-sulfur batteries is affected by many unavoidable problems, such as the low conductivity of sulfur, the probl...

Claims

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Application Information

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IPC IPC(8): D06M15/37D01D1/02D04H1/43D04H1/4318D04H1/4334D04H1/728H01M2/14H01M2/16D06M101/28D06M101/22D06M101/30
CPCD01D1/02D04H1/43D04H1/4318D04H1/4334D04H1/728D06M15/37D06M2101/22D06M2101/28D06M2101/30H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 周铖麦立强许絮
Owner WUHAN UNIV OF TECH
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