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Preparation method and application of metal organic framework MOF-808 film-based functional sandwich material

A MOF-808, metal organic framework technology, applied in electrical components, electrode carriers/current collectors, battery electrodes, etc., can solve the problem of destroying active metal sites and porous structures, reducing polysulfide binding capacity, MOFs material adsorption or Catalytic sites are limited and other problems, to achieve stable cycle performance, inhibit the shuttle effect, and improve the cycle stability.

Active Publication Date: 2021-04-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited adsorption or catalytic sites of MOFs materials, there is a certain upper limit on the inhibition of the shuttling effect.
In addition, in order to increase the conductivity, high-temperature carbonization of MOFs is generally required, which will destroy the active metal sites and porous structure of MOFs materials, and reduce their binding ability to polysulfides.

Method used

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  • Preparation method and application of metal organic framework MOF-808 film-based functional sandwich material
  • Preparation method and application of metal organic framework MOF-808 film-based functional sandwich material
  • Preparation method and application of metal organic framework MOF-808 film-based functional sandwich material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Synthesis of MOF-808 film material on carbon nanotube (CNT) film and its application in lithium-sulfur batteries:

[0029] Dissolve 1.45g of zirconium oxychloride octahydrate (4.5mmol) and 0.42g of trimesic acid (2mmol) in 20mL (1111mmol) of deionized water, stir magnetically at room temperature for 1h, then add 10mL of trifluoroacetic acid (134mmol), and ultrasonically 1h to obtain a synthetic solution. The synthesis solution was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, and the carbon nanotube thin film discs cut to a diameter of 19 mm by a cutting machine were vertically immersed in the synthesis solution. The hydrothermal reactor was placed in an oven, heated at 120 °C for 3 h, and then cooled to room temperature naturally. After taking out the material, wash it several times with deionized water and absolute ethanol, and dry it at 60°C. In order to avoid the excessive increase of impedance caused by the insulatin...

Embodiment 2

[0036] The synthesis steps are the same as in Example 1, except that 1.93g of zirconium oxychloride octahydrate (6mmol) and 0.42g of trimesic acid (2mmol) are dissolved in 21.6mL (1200mmol) of deionized water during the synthesis process, and magnetically After stirring for 30 min, 10.4 mL of trifluoroacetic acid (140 mmol) was added, and the synthesis temperature was changed from 120° C. to 110° C. The other steps were the same as in Example 1.

[0037] Figure 5 This is the surface SEM image of the MOF-808 film obtained in this example. It can be seen that the film layer is still dense and continuous. When it is used as a lithium-sulfur battery interlayer, the initial discharge capacity is 1185mAh g -1 , the discharge capacity after 100 cycles is 834mAh g -1 , The capacity retention rate was 70.4%.

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Abstract

The invention relates to a preparation method and application of a metal organic framework MOF-808 film-based functional interlayer material. The method comprises the following steps: dissolving zirconium oxychloride octahydrate and trimesic acid in deionized water, performing magnetic stirring for 30-60 minutes at normal temperature, then adding trifluoroacetic acid, and carrying out ultrasonic treatment for 30-60 minutes to obtain a synthetic solution; and then vertically immersing a carbon nanotube (CNT) film wafer in the synthetic liquid, and growing for 3-5 hours at the temperature of 110-130 DEG C to obtain the MOF-808 / CNT film. The MOF-808 / CNT film interlayer material obtained by the invention is simple to operate, easy to amplify and suitable for industrial production; when the material is used as an interlayer material between a positive electrode and a diaphragm in a lithium-sulfur battery, the performance of the lithium-sulfur battery can be remarkably improved, the reversible capacity of the lithium-sulfur battery can reach 1292mAh g <-1 >, and the cycle performance is stable.

Description

technical field [0001] The technical solution of the invention relates to a preparation method and application of a metal-organic framework MOF-808 film-based interlayer material, which belongs to the technical field of lithium-sulfur batteries. Background technique [0002] With the depletion of fossil energy, the development of new renewable clean energy has become the focus of attention. Lithium-sulfur secondary batteries (referred to as lithium-sulfur batteries), which use elemental sulfur or sulfur-containing compounds as the positive electrode and metallic lithium as the negative electrode, have an ultra-high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ), far exceeding current lithium-ion batteries. In addition, its cathode material sulfur is non-toxic and low in cost. Therefore, lithium-sulfur batteries are considered to be the most promising next-generation energy storage batteries with broad application prospects. [0003] Howe...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/46H01M50/411H01M4/62H01M4/66H01M10/052
CPCY02E60/10
Inventor 吴飞超王鑫瑶郑少宁
Owner HEBEI UNIV OF TECH
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