CuCo bimetal organic framework composite sulfur material and preparation and application thereof

An organic framework, bimetallic technology, applied in the field of materials, can solve the problems of rapid capacity decay of lithium-sulfur batteries and unstable cathode material structure.

Active Publication Date: 2019-02-19
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite solves the problems of too fast capacity decay of lithium-sulfur batteries during charge

Method used

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  • CuCo bimetal organic framework composite sulfur material and preparation and application thereof
  • CuCo bimetal organic framework composite sulfur material and preparation and application thereof
  • CuCo bimetal organic framework composite sulfur material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Weigh 0.035g of Cu(NO 3 )3H 2 O, 0.02g H 3 NTB, 0.02 g of DABCO as metal salt and organic ligand, 1 mL of ethanol, 3 mL of DMA, 1 mL of DMSO, 0.1 mL of fluoroboric acid and 1 mL of 1,4-do were added to the above mixture, respectively. The obtained solution was magnetically stirred until the solution was uniformly mixed, and then put into a drying oven at 85° C. for 5-7 days to dry. The dark green crystal obtained after taking it out was the MOF crystal with Cu as the central metal atom.

[0033]Step 2: Grind and mix the obtained MOF crystals and elemental sulfur powder in a ratio of 2:3 in an argon-filled glove box. After being completely ground, put it into a tube furnace for sintering, the temperature is 155 degrees, and the holding time is 2 hours. Take it out after cooling to room temperature naturally. Obtain MOF-S complex.

[0034] Step 3: Put the MOF-S composite obtained in Step 2 into a tube furnace for carbonization. In a tube furnace filled with ...

Embodiment 2

[0036] Step 1: Weigh 0.036g of Co(NO 3 ) 2 6H 2 O was dissolved in 5mL of methanol solution, 0.047g of 2-methylimidazole was dissolved in 5mL of methanol solution, the two were mixed, stirred on a magnetic stirrer for 30min, and after standing for 24h, the resulting solution was washed and filtered to obtain purple Precipitate, and then put it in a dry box overnight at 70 degrees to obtain a MOF crystal with Co as the central atom.

[0037] Step 2: Grind and mix the obtained MOF crystals and elemental sulfur powder in a ratio of 2:3 in an argon-filled glove box. After being completely ground, put it into a tube furnace for sintering, the temperature is 155 degrees, the holding time is 2 hours, and then it is naturally cooled to room temperature and taken out. Obtain MOF-S complex.

[0038] Step 3: Put the MOF-S composite obtained in Step 2 into a tube furnace for carbonization. In a tube furnace filled with argon, the carbonization temperature was set at 600 °C, and the h...

Embodiment 3

[0040] Step 1: Weigh 0.036gCu(NO 3 )3H 2 O and 0.036g Co(NO 3 ) 2 6H 2 O was added into a small glass bottle as a metal salt, and 0.02gH was weighed 3 NTB, 0.02 g DABCO, and 0.045 g 2-methylimidazole were used as organic ligands, and then 3 mL DMA, 1 mL DMSO, 1 mL ethanol, 0.1 mL fluoroboric acid, 1 mL 1, 4do, and 8 mL methanol were added dropwise to the above mixture. Put the above solution into a magnetic stirrer and stir until it is evenly mixed, and then put it into a drying oven to dry at 85° C. for 5-7 days. After extraction, the bimetallic MOF crystal structure was obtained.

[0041] Step 2: Grinding and mixing the bimetallic MOF crystal and elemental sulfur powder obtained above in a ratio of 2:3 in an argon-filled glove box. After being completely ground, put it into a tube furnace for sintering, the temperature is 155 degrees, and the holding time is 2 hours. Take it out after cooling to room temperature naturally. Obtain MOF-S complex.

[0042] Step 3: Put ...

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Abstract

The invention discloses a CuCo bimetal organic framework composite sulfur material capable of serving as a lithium-sulfur battery cathode material. Cu atoms not completely coordinated and polar Co atoms are alternately arranged in different ratios and are coordinated with an organic ligand to form a polyhedral MOF (metal oxide framework) structure; sulfur and its reaction product polysulfide are present in pores of the MOF structure and are sucked by different active sites provided by the pores and the two types of metal atoms; the MOF structure helps well suck sulfur into the pores of the MOFstructure, and high loss due to carbonization temperature and reaction is avoided. The invention also provides a preparation method of the CuCo bimetal organic framework composite sulfur material; the problems are solved that capacity of a lithium-sulfur battery attenuates too fast during charging and discharging and a cathode material experiences unstable structure due to volume expansion; the preparation method is simple; the materials are easy to attain; the problem that the capacity of a lithium-sulfur battery attenuates too fast can be solved; the development of the lithium-sulfur battery is greatly accelerated; the material herein has great research value and commercial value.

Description

technical field [0001] The invention belongs to the field of material technology, and relates to a lithium-sulfur battery cathode material, in particular to a CuCo bimetallic organic framework composite sulfur material and its preparation and application. Background technique [0002] Due to the low theoretical capacity of lithium-ion batteries, more and more researchers have turned their attention to lithium-sulfur batteries. Lithium-sulfur batteries are favored due to their high theoretical capacity and energy density. Its theoretical specific capacity and energy density can reach 1675mAh / g and 2600Wh / kg respectively. [0003] Elemental sulfur is abundant and cheap in nature, so it can be used as a cathode material for lithium-sulfur batteries. However, the conductivity of elemental sulfur is too poor, and the electronic conductivity is only 5x10 -30 S.cm -1 , which affects the development of lithium-sulfur batteries to a certain extent. Another reason that restricts ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 王娟韩国栋李永鹏杜振强张晶姚佳张咪李勇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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