Preparation and application of titanium-based metal organic framework modified diaphragm

An organic framework and base metal technology, which is applied to the diaphragm material for lithium-sulfur batteries and the fields of preparation and application thereof, can solve the problems of complex preparation process, and achieve the effects of simple preparation process, improved kinetics, and low reversible capacity.

Inactive Publication Date: 2020-07-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a preparation and application of a titanium-based metal-organic framework modified diaphragm, which overcomes difficulties such as complicated preparation process. A uniformly distributed titanium-based metal-organic framework (MIL-125) modified composite separator can be obtained

Method used

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  • Preparation and application of titanium-based metal organic framework modified diaphragm
  • Preparation and application of titanium-based metal organic framework modified diaphragm
  • Preparation and application of titanium-based metal organic framework modified diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Include the following steps:

[0033] (1) Weigh 3g of terephthalic acid powder and add it to 54mL of N,N-dimethylformamide and 6mL of anhydrous methanol, add 1.56mL of tetrabutyl titanate while stirring, and continue stirring for 3 hours to obtain a mixed solution.

[0034] (2) Transfer the mixed solution in step 1 to a hydrothermal reaction kettle for synthesis, set the oven temperature to 150°C, and the reaction time to 24h, and take it out after cooling to room temperature.

[0035] (3) The product of step 2 is centrifuged and washed with N,N-dimethylformamide and anhydrous methanol (centrifuge speed is 8000r / min, centrifuged for 5min each time), and then dried in a vacuum oven, the temperature of vacuum drying The temperature was 60° C., and the drying time was 12 hours, and the titanium-based metal-organic framework (MIL-125) white crystal powder was taken out.

[0036] (4) Weigh 270 mg of titanium-based metal-organic framework (MIL-125) powder and 30 mg of polyviny...

Embodiment 2

[0047] Nitrogen adsorption / desorption measurements were performed on the titanium-based metal-organic framework (MIL-125) prepared in Example 1, and the specific surface area was calculated using the multipoint Brunauer-Emmett-Teller (BET) method, and the non-local density pan The pore size distribution was calculated by function theory (NLDFT).

Embodiment 3

[0049] Include the following steps:

[0050] (1) Grind 120mg sublimated sulfur, 60mg Ketjen Black and 20mg polyvinylidene fluoride evenly, add 1-methyl-2-pyrrolidone (NMP) solvent, and stir to form a slurry.

[0051] (2) The slurry prepared in step 1 was uniformly coated on the carbon-coated aluminum foil with a coating machine, and then transferred to a vacuum oven for drying. The temperature of the vacuum drying was 60° C., and the drying time was 12 hours.

[0052] (3) Use a punching machine to make the electrode sheet prepared in step 2 into a disc with a diameter of 12 mm as the positive electrode for backup.

[0053] (4) Use two kinds of diaphragms, PP / PE-separator and MIL-125-PP / PE separator, to assemble the model CR2025 button lithium-sulfur battery in an argon-filled glove box (both water and oxygen content are lower than 0.1ppm); , the positive electrode of the battery is the positive electrode sheet in step 3; the electrolyte solution is 1M lithium bis(trifluoromet...

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Abstract

The invention relates to the preparation and application of a titanium-based metal organic framework modified diaphragm. The surface of the diaphragm is coated with a polypropylene/polyethylene diaphragm comprising a titanium-based metal organic framework. The metal organic framework (MIL-125) has the characteristics of high specific surface area, microporous structure and Lewis acid, the uniformdeposition of lithium ions is induced, and the shuttle effect of polysulfide in a lithium-sulfur battery is synergistically inhibited. Related tests show that the titanium-based metal organic framework (MIL-125) modified diaphragm prepared by the method effectively improves the cycle performance and the rate capability of the battery, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of diaphragm materials for lithium-sulfur batteries and their preparation and application, and in particular relates to the preparation and application of a titanium-based metal-organic framework modified diaphragm. Background technique [0002] In the face of the increasingly serious global environmental crisis and the rapid development of the new energy industry due to the rapid economic growth, in order to meet the rising energy demand, people are eager to explore a new generation of battery energy storage system with higher energy density. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g –1 ) and specific energy (2500Wh kg –1 ) is considered to be one of the most promising electrochemical energy storage systems of the new generation. At the same time, sulfur is abundant in nature, and is environmentally friendly and cheap. However, there are still many factors restricting the commer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411Y02E60/10
Inventor 王丽娜齐楚刘天西王佳
Owner DONGHUA UNIV
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