Sulfur-loaded MOF@ conductive polymer material and preparation method and application thereof

A conductive polymer and sulfur-carrying technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of low conductivity, low discharge specific capacity, low sulfur utilization rate, etc., achieve high specific capacity, and simple preparation process , Discharge specific capacity and improved cycle stability

Active Publication Date: 2018-09-21
SUZHOU INSTITUE OF WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the nanoscale pores of MOF can uniformly disperse sulfur in the form of molecules, the low conductivity of MOF leads to low utilization of sulfur, so the discharge specific capacity of lithium-sulfur batteries based on MOF sulfur carriers is generally not high.

Method used

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  • Sulfur-loaded MOF@ conductive polymer material and preparation method and application thereof
  • Sulfur-loaded MOF@ conductive polymer material and preparation method and application thereof
  • Sulfur-loaded MOF@ conductive polymer material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1): Weigh 120 mg of degassed MIL-53 powder and 180 mg of sublimed sulfur, mix them and grind them evenly in a mortar, seal the mixture in a glass tube after grinding, and then place the glass tube in a convection current at 155°C Heated in an oven for 12 hours, took out the glass tube, and naturally cooled to room temperature to obtain the sulfur-loaded MOF material S-in-MIL-53.

[0036] Step 2): Prepare 0.4M polyvinylpyrrolidone aqueous solution (PVP, K30, 0.02g / mL) to modify S-in-MIL-53. Weigh 70 mg of S-in-MIL-53, pour it into 10 mL of 0.4 M polyvinylpyrrolidone aqueous solution, stir at room temperature for 10 minutes, then centrifuge repeatedly three times, then wash with deionized water, and collect the precipitate. Finally, the precipitate was ultrasonically dispersed in 10 mL of deionized water, then poured into a 50 mL round bottom flask, and stirred evenly by magnetic force to obtain the modified S-in-MIL-53 aqueous dispersion.

[0037] Step 3): Preparat...

Embodiment 2

[0042] Step 1): Weigh 80 mg of degassed MIL-101 powder and 120 mg of sublimed sulfur, mix them and grind them evenly in a mortar, seal the mixture in a glass tube after grinding, and then place the glass tube in a convection type Heated in the oven for 12 hours, took out the glass tube, and naturally cooled to room temperature to obtain the sulfur-loaded MOF material S-in-MIL-101.

[0043] Step 2): Dissolve 1.2mg of sodium dodecylbenzenesulfonate (SDBS) in 10mL of water and pour it into a 50mL flask, then add 100mg of S-in-MIL-101, ultrasonically disperse and add 40μL of aniline mono body, stirred for 10 minutes, then added 120 μL of concentrated hydrochloric acid and continued to stir for 10 minutes.

[0044] Step 3) Dissolve 100 mg of sodium persulfate in 5 mL of deionized water and pour it into the above-mentioned flask as a polymerization agent, and continue to stir for 12 hours at room temperature.

[0045] Step 4): Centrifuge the solution after polymerization and collec...

Embodiment 3

[0049] Step 1): Weigh 80 mg of degassed PCN-224 powder and 120 mg of sublimed sulfur, mix them and grind them evenly in a mortar, seal the mixture in a glass tube after grinding, and then place the glass tube in a convection type The oven was heated for 12 hours, the glass tube was taken out, and cooled to room temperature naturally to obtain the sulfur-loaded MOF material S-in-PCN-224.

[0050] Step 2): Prepare 0.4M polyvinylpyrrolidone aqueous solution (PVP, K30, 0.02g / mL) to modify S-in-PCN-224. Add 70mg of S-in-PCN-224 into 10mL of 0.4M polyvinylpyrrolidone aqueous solution, stir at room temperature for 10 minutes, centrifuge repeatedly three times, wash with deionized water, collect the precipitate, ultrasonically disperse the precipitate in 10mL of deionized water, and then Pour it into a 50mL round-bottomed flask and stir evenly with magnetic force to obtain the modified S-in-PCN-224 water dispersion.

[0051] Step 3): Preparation of Fe-containing 3+ Aqueous solution ...

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Abstract

The invention discloses a sulfur-loaded MOF@ conductive polymer material with high electronic conductivity and a preparation method thereof. The method comprises the steps that activated MOF powder isuniformly mixed with elemental sulfur, a mixture is heated after sealing is conducted, and the sulfur-loaded MOF material is obtained after cooling is conducted; the sulfur-loaded MOF material is modified with a surface active agent, the sulfur-loaded MOF material and conductive polymer monomers are dispersed in a solvent, and a polymerization agent is added in to conduct oxidative polymerizationreaction to obtain the sulfur-loaded MOF@ conductive polymer material. The abundant and ordered porous structure of the MOF can be maintained by the material, and the material has a core-shell structure which has better electronic transmission performance. Sulfur can be better dispersed in pores of MOF polarity by the MOF in the form of molecular state, and the MOF has a certain restriction effect on the dispersing of Li2S6 generated in the discharging process. Abundant electronic transmission channels are provided by conductive polymers, and the dissolving and dispersing of Li2S6 in electrolyte can be prevented. The material of a positive electrode of a Li-S battery has high specific capacity and circulation stability due to the synergistic reaction of the MOF and the conductive polymers.

Description

technical field [0001] The invention belongs to the field of preparation of cathode materials for lithium-sulfur batteries, and in particular relates to a sulfur-loaded MOF@conductive polymer material with high electrical conductivity and its preparation method and application. Background technique [0002] Renewable resources such as solar energy, wind energy, and ocean energy provide inexhaustible energy for human beings, but due to their intermittent characteristics, the direct use of these resources faces great technical challenges. The development of energy storage devices with high energy density is an important development direction to realize intermittent energy storage and controllable release. Traditional lithium-ion batteries have occupied an important position in daily life, but limited by their capacity, it is still difficult to meet the requirements of electronic products and electric vehicles that require a long battery life. Lithium-sulfur batteries have a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/624H01M4/625Y02E60/10
Inventor 邓鹤翔江浩庆柯福生
Owner SUZHOU INSTITUE OF WUHAN UNIV
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