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Defect-based compound anchored monatomic composite material as well as preparation method and application thereof

A composite material and compound technology, applied in the field of electrochemical energy materials, can solve problems such as high cost and complex process

Active Publication Date: 2021-05-18
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 monatomic composite material as well as preparation method and application thereof
  • Defect-based compound anchored monatomic composite material as well as preparation method and application thereof
  • Defect-based compound anchored monatomic composite material as well as preparation method and application thereof

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preparation example Construction

[0033] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned defect-based compound-anchored single-atom composite material, which includes:

[0034] Mix graphene oxide, carbon nanotubes, surfactants, polysulfides, metal salt precursors and solvents evenly, then add metal single-atom precursors, and undergo 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 single-atom composite material anchored by defect-based compounds.

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

Embodiment 1

[0074] Take by weighing 720mg of sulfur powder and 580mg of sodium sulfide and stir in 25mL of ultrapure water 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 is effectively ultrasonically dispersed in 250mL of ultrapure water; weigh a certain amount of ferrous acetate powder and add it to the above dispersion liquid, stir well, and then slowly add 3mL of sodium polysulfide solution to the dispersion liquid , then add 20mg of Ni(Ac) 2 4H 2 O, hydrothermal reaction at 150°C for 12 hours, then filtered and washed, and freeze-dried to obtain the initial sample; under the atmosphere of Ar, rise to 500°C for 30 minutes, keep it warm for 30 minutes, and cool to room temperature to obtain a defect-based compound-anchored nickel atom composite. Depend on figure 1 It can be seen that the nanoparticle size of the prepared composite material is rela...

Embodiment 2

[0076] Take by weighing 720mg of sulfur powder and 580mg of sodium sulfide and stir in 25mL of ultrapure water 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, ultrasonically disperse effectively in 250mL of ultrapure water; weigh a certain amount of ferrous acetate powder and add it to the above dispersion liquid, and stir thoroughly; then slowly add 3mL of sodium polysulfide solution to the dispersion liquid , then add 50mg of Co(Ac) 2 , hydrothermal reaction at 120°C for 12h, then filtered, washed, and freeze-dried to obtain the initial sample; in Ar / NH 3 Under an atmosphere of 100°C for 30 minutes, keep it warm for 120 minutes, and cool to room temperature to obtain a defect-based compound-anchored cobalt atom composite material. figure 2 It can be seen that the nanoparticle size of the prepared composite material is relatively small, and...

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Abstract

The invention discloses a defect-based compound anchored monatomic composite material as well as a preparation method and application thereof. The defect-based compound anchored monatomic composite material comprises a defect-based compound, monatomic loaded on the defect-based compound and sulfur-doped nanocarbon, the sulfur-doped nanocarbon has a hierarchical pore structure, and the defect-based compound is distributed in the hierarchical pore structure of the sulfur-doped nanocarbon; the content of the single atoms in the defect-based compound loaded with the single atoms is 0.1-20 at%; and the defect-based compound comprises any one or a combination of more than two of a metal oxide, a metal sulfide and a metal nitride. According to the invention, the defect-based composite material loaded with metal single atoms is prepared by adopting a simple method, and the method is mild in condition and easy to realize industrialization; and the metal monatomic structure and the defect structure in the composite material can provide abundant catalytic activity centers, so that the composite material has a good application prospect in rechargeable lithium metal-based batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy materials, and specifically relates to a defect-based compound-anchored single-atom composite material and its preparation method and application, for example, the 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-sulfur (Li / S) batteries based on lithium metal have a high energy density (2600 W h kg -1 ) has attracted widespread attention and has become the most promising next-generation rechargeable battery. However, there are still a series of problems hindering the widespread practical application of Li / S batteries, such as the low utilization rate of active material sulfur and slow conversion kinetics on the positive side; Lithium dendrites are generated, and the germination and growth of dendrit...

Claims

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Application Information

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Patent Type & Authority Applications(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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