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Bimetallic two-dimensional MOF series catalyst applied to lithium-sulfur battery

A bimetallic and catalyst technology, applied in the field of development and research of new energy materials, can solve problems such as unfavorable scale utilization

Pending Publication Date: 2022-01-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although effective, the metal / nitrogen-doped carbon materials prepared by the above-mentioned high-temperature carbonization method not only require high-temperature (≥600 °C) operation under an inert atmosphere, but also require precise control of synthesis conditions to prevent metal atoms from agglomerating and growing, which is not conducive to Scale utilization
[0004] Lithium-sulfur batteries involve solid-liquid-solid multiphase conversion, and a single catalytic active center is difficult to meet the requirements of multi-species catalytic conversion in a real battery environment. Therefore, the design of lithium-sulfur battery catalysts is a big challenge.

Method used

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  • Bimetallic two-dimensional MOF series catalyst applied to lithium-sulfur battery
  • Bimetallic two-dimensional MOF series catalyst applied to lithium-sulfur battery
  • Bimetallic two-dimensional MOF series catalyst applied to lithium-sulfur battery

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Embodiment 1

[0025] The preparation of a bimetallic two-dimensional MOF tandem catalyst and its application in lithium-sulfur batteries, the following steps are adopted:

[0026] (1) 0.3mmol CoCl 2 ·6H 2 O, 0.3 mmol NiCl 2 ·6H 2 O, 0.78mmol terephthalic acid and 2.5mmol (ie 30mg) CMK-3 were ultrasonically dispersed in 4mL distilled water, 4mL ethanol and 62mL DMF, then added 6mmol triethylamine and stirred evenly, ultrasonicated at 200W for 10h, passed through DMF respectively and ethanol centrifugal washing, vacuum drying at 60 degrees to obtain a bimetallic two-dimensional MOF powder sample, its scanning electron microscope photo is as follows figure 1 As shown, the nanosheets prepared by the present invention are thin, uniform and transparent.

[0027] (2) Use bimetallic two-dimensional MOF series catalysts to support sulfur, the mass percentage of sulfur is 30%, dissolve sulfur in diethylamine and mix with MOF ethanol dispersion, add dilute nitric acid to neutralize and stir for 1 ...

Embodiment 2

[0029] The preparation of a bimetallic two-dimensional MOF tandem catalyst and its application in lithium-sulfur batteries, the following steps are adopted:

[0030] (1) 0.3mmol CoCl 2 ·6H 2 O, 0.3 mmol NiCl 2 ·6H 2O, 0.6mmol terephthalic acid, 0.6mmol KB were ultrasonically dispersed in 4mL distilled water, 4mL ethanol and 40mL DMF, then added 3mmol triethylamine and stirred evenly, ultrasonicated at 400W for 6h, washed by DMF and ethanol, respectively, vacuum 60 The bimetallic two-dimensional MOF powder samples were obtained by high-degree drying.

[0031] (2) Use bimetallic two-dimensional MOF series catalysts to support sulfur, the mass percentage of sulfur is 90%, dissolve sulfur in diethylamine and mix with MOF ethanol dispersion, add dilute nitric acid for neutralization, and stir for 3 hours. Its transmission electron microscope pictures are as figure 2 As shown, sulfur is uniformly distributed on the surface of the bimetallic MOF. Then the sulfur-loaded bimetal...

Embodiment 3

[0033] (1) 0.3mmol Co(NO 3 ) 2 ·6H 2 O, 0.3mmol Ni(NO 3 ) 2 ·6H 2 O, 0.9mmol terephthalic acid and 0.9mmol Super P were ultrasonically dispersed in 4mL distilled water, 4mL ethanol and 80mL DMF, then added 3mmol triethylamine and stirred evenly, and the mixed solution was transferred to a microwave tube, and placed in a microwave reactor React at 40°C for 0.5h, wash with DMF and ethanol, and dry in vacuum at 60°C to obtain a bimetallic two-dimensional MOF powder sample.

[0034] (2) Use bimetallic two-dimensional MOF series catalysts to support sulfur, the mass percentage of sulfur is 80%, dissolve sulfur in diethylamine and mix with MOF ethanol dispersion, add dilute nitric acid for neutralization, and stir for 0.5h , the X-ray diffraction patterns of the bimetallic two-dimensional MOF before and after sulfur loading are as follows image 3 As shown, it can be known that the bimetallic MOF is crystalline, and the XRD diffraction peaks of the MOF itself are covered by hi...

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Abstract

The invention relates to a preparation method of a bimetallic two-dimensional metal organic framework (MOF) series catalyst and partitioned series catalysis of the bimetallic two-dimensional metal organic framework (MOF) series catalyst in a sulfur reduction process in a lithium-sulfur battery, and belongs to the technical field of development and research of new energy materials. According to the invention, MOF is prepared from salts of different metal sites and an organic ligand through an ultrasonic method or a microwave method, a small amount of conductive carbon is added in the MOF synthesis process, a current collector is coated with the conductive carbon after sulfur loading to serve as a working electrode of a battery, a metal lithium sheet serves as a counter electrode and a reference electrode, a polypropylene film serves as a diaphragm, an organic solution serves as an electrolytic solution, and a button battery is assembled in a glove box filled with high-purity argon; and compared with the prior art, the catalyst can be used as a partitioned serial catalyst in a sulfur electrochemical reduction process, is widely applied to the field of energy sources such as lithium-sulfur batteries and the like, and has excellent charge / discharge performance.

Description

technical field [0001] The invention relates to a preparation method and application of an electrode material, in particular to a preparation method and application of a bimetallic two-dimensional MOF series catalyst, and belongs to the technical field of development and research of new energy materials. Background technique [0002] Lithium-sulfur batteries have emerged as strong candidates for next-generation high-performance energy storage technologies due to their high theoretical energy density and cost-effectiveness. However, the electrochemical process of lithium-sulfur batteries is a multi-step conversion reaction. The soluble polysulfide (LiPS) intermediate shuttles between the positive and negative electrodes and reacts with the lithium negative electrode to form short-chain polysulfides, resulting in positive electrode activity. Substances are constantly being lost. The shuttle effect eventually leads to high self-discharge rate, low Coulombic efficiency and poor...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J35/10H01M4/62H01M10/052
CPCB01J31/1691B01J31/223H01M4/628H01M4/625H01M10/052B01J2531/845B01J2531/847B01J35/61Y02E60/10
Inventor 梁宵孟瑞晋陈萱萱
Owner HUNAN UNIV
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