Defect-based compound-anchored single-atom composite material and its preparation method and application

A composite material and compound technology, applied in the field of electrochemical energy materials, can solve problems such as high cost and complex process, and achieve the effects of mild conditions, simple preparation process and overall electrochemical performance improvement.

Active Publication Date: 2022-05-31
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current lithium anode protection methods are often cumbersome. For example, the lithium anode is pretreated by rolling method, smelting method, and chemical deposition method. Since lithium metal is relatively active, the whole process needs to be carried out in a protective atmosphere. complex and expensive

Method used

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  • Defect-based compound-anchored single-atom composite material and its preparation method and application
  • Defect-based compound-anchored single-atom composite material and its preparation method and application
  • Defect-based compound-anchored single-atom composite material and its preparation method and application

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preparation example Construction

[0033] Another aspect of the embodiments of the present invention also provides the aforementioned preparation method of the defect-based compound-anchored single-atom composite material, comprising:

[0034] Mix graphene oxide, carbon nanotubes, surfactant, polysulfide, metal salt precursor and solvent evenly, then add metal single-atom precursor, and perform a hydrothermal reaction at 120-200 ° C for 12 hours;

[0035] and, in NH 3 and / or in an inert atmosphere, the obtained hydrothermal reaction product is heat-treated at 100-500° C. for 10-120 minutes to obtain a defect-based compound-anchored single-atom composite material.

[0036] In some specific embodiments, the preparation method includes: ultrasonically dispersing graphene oxide, carbon nanotubes and a surfactant in a solvent, then adding a metal salt precursor to fully mix to form a first dispersion, and then adding a The polysulfide solution is added to the obtained first dispersion liquid and mixed, and then the...

Embodiment 1

[0074] Weigh 720mg of sulfur powder and 580mg of sodium sulfide in 25mL of ultrapure water and stir to form a yellow sodium polysulfide solution; Measure 50mL of graphene oxide solution (4mg / mL) and 200mg of carbon nanotube powder, on the surface Under the action of the active agent, it was effectively ultrasonically dispersed in 250 mL of ultrapure water; a certain amount of ferrous acetate powder was weighed and added to the above dispersion, fully stirred, and then 3 mL of sodium polysulfide solution was slowly added to the dispersion. , followed by adding 20 mg of Ni(Ac) 2 ·4H 2 O, 150 °C hydrothermal reaction for 12 h, then filtered and washed, and freeze-dried to obtain the initial sample; in an Ar atmosphere, the temperature was raised to 500 °C for 30 min, maintained for 30 min, and cooled to room temperature to obtain the defect-based compound-anchored nickel atom composite material. Depend on figure 1 It can be seen that the nanoparticle size of the prepared compos...

Embodiment 2

[0076] Weigh 720mg of sulfur powder and 580mg of sodium sulfide in 25mL of ultrapure water and stir to form a yellow sodium polysulfide solution; weigh 50mL of graphene oxide solution (4mg / mL) and 200mg of carbon nanotube powder, on the surface Under the action of the active agent, it was effectively ultrasonically dispersed in 250 mL of ultrapure water; a certain amount of ferrous acetate powder was weighed and added to the above dispersion, and stirred thoroughly; then 3 mL of sodium polysulfide solution was slowly added to the dispersion. , followed by the addition of 50 mg of Co(Ac) 2 , hydrothermally reacted at 120 °C for 12 h, then filtered and washed, and freeze-dried to obtain the initial sample; 3 In the atmosphere of 30min, it was raised to 100°C, kept for 120min, and cooled to room temperature to obtain the defect-based compound-anchored cobalt atom composite material. figure 2 It can be seen that the nanoparticle size of the prepared composite material is relativ...

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Abstract

The invention discloses a defect-based compound-anchored single-atom composite material, a preparation method and application thereof. The defect-based compound-anchored single-atom composite material includes a defect-based compound, a single atom supported on the defect-based compound, and sulfur-doped nanocarbon; the sulfur-doped nanocarbon has a hierarchical pore structure, and the The defect-based compound is distributed in the hierarchical porous structure of the sulfur-doped nano-carbon; the content of the single atom in the defect-based compound supporting the single atom is 0.1-20 at %; the defect-based compound includes metal oxide, Any one or a combination of two or more of metal sulfides and metal nitrides. The present invention adopts a simple method to prepare defect-based composite materials loaded with metal single atoms. The method has mild conditions and is easy to realize industrialization; and the metal single atoms and defect structures in the composite materials can provide abundant catalytic active centers. It has a good application prospect in metal-based batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy materials, and in particular relates to a defect-based compound-anchored single-atom composite material, a preparation method and an application thereof, for example, an application in a rechargeable lithium metal-based battery. Background technique [0002] At present, the energy density of traditional lithium-ion batteries can no longer meet the demand for high energy density in smart life. Lithium-metal-based lithium-sulfur (Li / S) batteries exhibit high energy density (2600 W·h·kg -1 ) has attracted widespread attention as the most promising next-generation rechargeable battery. However, there are still a series of problems that hinder the wide practical application of Li / S batteries, such as low utilization of active material sulfur and slow conversion kinetics on the cathode side; Li dendrites are generated, and the germination and growth of single Li metal surface dendrites ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/583H01M4/62H01M10/052H01M10/42B82Y30/00B82Y40/00
CPCH01M4/362H01M4/38H01M10/052H01M4/583H01M4/625H01M4/48H01M4/5815H01M10/4235B82Y30/00B82Y40/00Y02E60/10
Inventor 王健蔺洪振程双
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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