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Monatomic metal/nitrogen co-doped hollow carbon sphere photo-electro-catalytic material as well as preparation method and application thereof

An electrocatalytic material, hollow carbon sphere technology, applied in the direction of separators/films/diaphragms/spacers, circuits, electrical components, etc., can solve the problem of uncontrollable metal single atom content and product morphology, metal waste, and difficulty in uniformity Dispersion and other problems, to achieve the effect of improving the performance of lithium-sulfur batteries, improving electrical performance, and improving electrical performance

Inactive Publication Date: 2021-09-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the shuttle effect of polysulfides during the charging and discharging process of lithium-sulfur batteries greatly limits the application of lithium-sulfur batteries. To solve this problem, a variety of materials are used for separator modification, through physical barrier, chemical adsorption, electro / Photocatalysis suppresses the shuttling effect
Such as carbon materials, polymer materials, metal compound materials, etc., but the single physical barrier effect of carbon materials or polymer materials is not enough to fully inhibit the shuttle of polysulfides. Limit the shuttle of polysulfides, but the low conductivity of metal compound materials is not conducive to high-current charging and discharging, and the activity of agglomerated metal compounds is low, which is not conducive to fully exerting the photo / electrocatalytic effect
[0004] Single-atom metals have attracted much attention in the field of lithium-sulfur battery catalysis because their atom utilization rate is as high as 100%, and they will not affect the conductivity of the substrate. The impregnation method is not easy to disperse the metal atoms uniformly, which leads to the formation of metal agglomerated particles that require subsequent steps such as acid treatment, not only the preparation steps are cumbersome, but also cause metal waste
It is an effective way to prepare supported single-atom catalysts using metal-containing compounds such as MOF as precursors, but the content of metal single atoms and the shape of the product are uncontrollable, so the performance of the catalyst cannot be adjusted.

Method used

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  • Monatomic metal/nitrogen co-doped hollow carbon sphere photo-electro-catalytic material as well as preparation method and application thereof
  • Monatomic metal/nitrogen co-doped hollow carbon sphere photo-electro-catalytic material as well as preparation method and application thereof
  • Monatomic metal/nitrogen co-doped hollow carbon sphere photo-electro-catalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of monoatomic iron / nitrogen co-doped hollow carbon sphere material

[0034] Weigh 1 g of silica hard template and sonicate it for 30 min to fully and evenly disperse it in 150 ml of water, making it solution a; weigh 750 mg of dopamine hydrochloride and 50 mg of porphyrin iron, add it into 30 ml of water and stir evenly, making it a solution b; Weigh 500 mg of tris hydroxymethylaminomethane and add it to 20 ml of deionized water and mix it evenly to make it solution c; add b and c solutions into solution a successively, stir mechanically at 800 r for 6 h at room temperature, and the products are sequentially After washing with water and ethanol three times each, it was collected by centrifugation, and the product collected by centrifugation was dried in an oven at 60 °C for 12 h to obtain a brown powder. Then dry the powder in N 2 The heat treatment was carried out under the atmosphere, the temperature was raised to 900 °C, and the intermediate p...

Embodiment 2

[0035] Example 2: Preparation of single-atom cobalt / nitrogen co-doped hollow carbon sphere material

[0036]Weigh 1 g of silica hard template and ultrasonically disperse it in 150 ml of deionized water, stir evenly to make it solution a; weigh 750 mg of dopamine hydrochloride and 20 mg of cobalt acetylacetonate and add it to 30 ml of water and stir evenly to make it Solution b; Weigh 500 mg tris hydroxymethyl aminomethane and add it into 20 ml deionized water and mix it evenly to make it solution c; add b and c solutions dropwise into a solution in turn, mechanically stir at 800 r for 1 h at room temperature, the product After washing with water and ethanol three times each, the product was collected by centrifugation, and the product collected by centrifugation was dried in an oven at 60 °C for 12 h to obtain a brown powder. Then dry the powder in a tube furnace, N 2 Heat treatment was carried out under the atmosphere, the temperature was raised to 900 °C, and carbonization ...

Embodiment 3

[0037] Example 3: Preparation of single-atom nickel / nitrogen co-doped hollow carbon material

[0038] Weigh 1 g of silica hard template and ultrasonically disperse it in 150 ml of deionized water, stir evenly to make it a solution a; weigh 750 mg of dopamine hydrochloride and 30 mg of nickel acetylacetonate into 30 ml of water and stir evenly to make it Solution b; Weigh 500 mg tris hydroxymethyl aminomethane and add it into 20 ml deionized water and mix it evenly to make it solution c; add b and c solutions dropwise into a solution in turn, mechanically stir at 800 r for 1 h at room temperature, the product After washing with water and ethanol three times each, the product was collected by centrifugation, and the product collected by centrifugation was dried in an oven at 60 °C for 12 h to obtain a brown powder. Then dry the powder in a tube furnace, N 2 Heat treatment was carried out under the atmosphere, the temperature was raised to 900 °C, and carbonization and pyrolysis...

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Abstract

The invention relates to a monatomic metal / nitrogen co-doped hollow carbon sphere photo-electro-catalytic material as well as a preparation method and application thereof. Silicon dioxide is used as a hard template, and metal atoms are uniformly dispersed in a polymerization process through interaction of rich functional groups of dopamine and metal salt; and after pyrolysis and carbonization, the template is etched to obtain the monatomic metal / nitrogen co-doped hollow carbon sphere material. The material has multiple synergistic effects of physical adsorption, chemical adsorption, optical / electro-catalytic conversion and the like on polysulfide. When the material is used for a lithium-sulfur battery diaphragm coating, shuttling of polysulfide can be effectively inhibited, conversion of the polysulfide is accelerated, and therefore, the electrical property of a lithium-sulfur battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery energy storage, and specifically relates to a monoatomic metal / nitrogen co-doped hollow carbon sphere photo / electrocatalytic material and its preparation method and application, especially the application in the modified coating of lithium-sulfur battery diaphragm . Background technique [0002] Facing environmental pollution caused by fuel vehicles, energy shortages and other issues. New energy vehicles are ushering in new developments, and the improvement of power battery performance is the key to solving the problem of low mileage of new energy vehicles. The lithium-sulfur battery has attracted much attention because of its high theoretical capacity and active sulfur, which is environmentally friendly, low-cost, and abundant in reserves. It is a very promising power battery. [0003] However, the shuttle effect of polysulfides during the charging and discharging process of lithium-sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/409H01M10/052
CPCH01M50/449H01M50/409H01M10/052Y02E60/10
Inventor 曲晋张婷婷于中振
Owner BEIJING UNIV OF CHEM TECH
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