An ultrathin two-dimensional metal-organic framework material and its preparation method and application

A metal-organic framework, ultra-thin technology, applied in structural parts, battery pack parts, lithium batteries, etc., can solve the problem of irreversible attenuation of battery capacity, and achieve the effect of reducing the shuttle effect, simple and easy steps, and enriching the surface structure.

Active Publication Date: 2021-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the formation and shuttling of polysulfides during charging and discharging, the irreversible attenuation of battery capacity is caused.

Method used

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  • An ultrathin two-dimensional metal-organic framework material and its preparation method and application
  • An ultrathin two-dimensional metal-organic framework material and its preparation method and application
  • An ultrathin two-dimensional metal-organic framework material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Preparation of ultra-thin two-dimensional Co-MOF material

[0049] A method for preparing an ultrathin two-dimensional metal organic framework material, comprising the steps of:

[0050] (1) The three-dimensional layered columnar MOF precursor is subjected to ball milling, the ball milling is wet ball milling, the ball milling aid used in the ball milling is absolute ethanol, the speed of ball milling is 350r / min, the time of ball milling is 5h, and dried The temperature is 70°C to obtain the ball-milled precursor, and then weigh 15 mg of the ball-milled precursor and add it to 20 mL of solvent (N,N-dimethylformamide is selected), and the ultrasonic dispersion is uniform, and the ultrasonic time is 20 minutes. The frequency is 36kHz to obtain the mixed solution, and the O 3 / O 2 The mixed gas reacts, the reaction temperature is 0°C, the reaction time is 90min, O 3 / O 2 Mixed gas (O 3 The volume fraction is 50%) and the flow rate is 70mL / min to obtain the ...

Embodiment 2 2

[0057] Example 2 Preparation of two-dimensional Cu-MOF material

[0058] A method for preparing an ultrathin two-dimensional metal organic framework material, comprising the steps of:

[0059] (1) The three-dimensional layered columnar MOF precursor is subjected to ball milling, the ball milling is wet ball milling, the ball milling aid used in the ball milling is absolute ethanol, the speed of ball milling is 400r / min, the time of ball milling is 4h, and dried (The temperature is 60°C) to obtain the ball-milled precursor, then weigh 20mg of the ball-milled precursor and add it to 25mL solvent (N,N-dimethylformamide is selected), and the ultrasonic dispersion is uniform, and the ultrasonic time is 25min. The frequency of ultrasound is 40kHz to obtain the mixed solution, and the O 3 / O 2 The mixed gas reacts, the reaction temperature is 0°C, the reaction time is 90min, O 3 / O 2 Mixed gas (O 3 The volume fraction is 50%) and the flow rate is 70mL / min to obtain the reaction ...

Embodiment 3 2

[0066] Example 3 Preparation of two-dimensional Zn-MOF material

[0067] A method for preparing an ultrathin two-dimensional metal organic framework material, comprising the steps of:

[0068] (1) The three-dimensional layered columnar MOF precursor is subjected to ball milling treatment, the ball milling treatment is wet ball milling, the ball milling aid used in the ball milling treatment is absolute ethanol, the speed of the ball milling treatment is 300r / min, the time of the ball milling treatment is 6h, and dried (The temperature is 80°C) to obtain the ball-milled precursor, and then weigh 15 mg of the ball-milled precursor and add it to 30 mL of solvent (N,N-dimethylformamide is selected), and the ultrasonic dispersion is uniform, and the ultrasonic time is 30 minutes. The frequency of ultrasound is 36kHz to obtain the mixed solution, and the O 3 / O 2 The mixed gas reacts, the reaction temperature is 0°C, the reaction time is 90min, O 3 / O 2 Mixed gas (O 3 The volum...

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Abstract

The invention discloses an ultra-thin two-dimensional metal-organic frame material, a preparation method and application thereof. The method comprises: ball milling the three-dimensional layered columnar MOF precursor, adding the ball-milled precursor into a solvent, and dispersing evenly to obtain a mixed solution, and feeding O 3 / O 2 The mixed gas is reacted, left standing, the supernatant is taken, the precipitate is centrifuged, washed, and dried to obtain an ultrathin two-dimensional metal organic framework material. The method is simple and has wide applicability. The morphology of the two-dimensional metal organic framework is controllable, the thickness is ultra-thin and uniform, and the surface is functionalized with carboxyl groups, which enriches its structure and expands its application prospects. The present invention also applies the ultra-thin two-dimensional metal organic framework material to the modification of the lithium-sulfur battery diaphragm, prepares a dispersion liquid, and modifies it on the commercial PP diaphragm through vacuum filtration to test the cycle stability of the battery. To inhibit the shuttle effect of polysulfides, improve the cycle stability of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to the technical fields of preparation of two-dimensional metal organic framework materials and electrochemical energy storage, in particular to an ultrathin two-dimensional metal organic framework material and its preparation method and application. Background technique [0002] Since 2004, the discovery of single-layer graphene obtained by mechanical exfoliation, the research of ultra-thin two-dimensional nanomaterials in the fields of condensed matter physics, materials science, chemistry and nanotechnology has grown exponentially. Among them, two-dimensional metal organic framework (Metal Organic Framework, MOF) is an attractive class of porous crystalline materials, which are composed of metal nodes and organic linkers. With the advantages of highly regular pore structure, tunable pores, huge surface area, and active exposed sites, 2D MOF is considered to be a high-quality material with great application potential. Recently,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00H01M50/411H01M50/449H01M10/052
CPCC08G83/008H01M10/052Y02E60/10
Inventor 梁振兴卓宝柳谭爱东
Owner SOUTH CHINA UNIV OF TECH
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