Monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, preparation method and application

A graphene foam, in-situ growth technology, applied in the direction of graphene, nano-carbon, electrical components, etc., can solve the problems of irreversible capacity attenuation of lithium-sulfur batteries, low utilization rate of active materials, and reduced ionic conductivity, etc., to promote the positive electrode. Redox kinetics, good cycling and rate capability, addressing limited surface area effects

Pending Publication Date: 2021-07-13
HEBEI UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when elemental sulfur is used alone as the positive electrode of the lithium-sulfur battery, it will lead to difficulties in electron transport, a decrease in the electrochemical reaction rate, and a decrease in the utilization rate of the active material sulfur, thereby affecting the electrochemical performance of the lithium-sulfur battery.
(2) The soluble polysulfide intermediates produced during charging and discharging are easily soluble in the electrolyte, which will lead to the loss of the active substance sulfur, and at the same time, the increase in the viscosity of the electrolyte will lead to a continuous decrease in the conductivity of the ions
(3) During the charge and discharge process, due to the different densities of the intermediates at different

Method used

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  • Monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, preparation method and application
  • Monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, preparation method and application
  • Monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, preparation method and application

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Embodiment 1

[0084] This embodiment provides a graphene foam of in-situ growth doped nitrogen atom carbon nanospheres dispersed by single atom nickel, and its scanning electron microscope photo is as follows figure 1 As shown, it can be seen that the diameter of the carbon nanospheres is 200-400nm, the surface is smooth, the dispersion is good, and there is no impurity. The X-ray diffraction pattern is as follows figure 2 As shown, it can be seen from the figure that two broad diffraction peaks can be clearly observed at diffraction angles of 25° and 44°, which are attributed to the presence of carbon nanospheres; in addition, sharp peaks at 26° and 44° and The faint diffraction peak at 54° is attributed to the graphene foam structure.

Embodiment 2

[0086] The present embodiment provides the preparation method of the graphene foam of the in-situ growth doped nitrogen atom carbon nanospheres of the monoatomic nickel dispersed in the embodiment 1, comprising the following steps:

[0087] The first step: preparing metal foam nickel / graphene composite material.

[0088] Firstly, metal foam nickel was ultrasonically cleaned in acetone, ethanol and deionized water for 5 min, rinsed with deionized water, and dried in a vacuum oven for 1 h; the cleaned metal foam nickel was placed in a CVD system tube furnace, first Exclude the air in the tube, then use a vacuum pump to pump the air pressure in the tube to 5Pa, then flush argon to normal pressure, and repeat this twice; then in Ar:H 2 (200sccm: 200sccm) mixed gas flow, 30min to 1000 ° C; in Ar: H 2 (200sccm: 300sccm) annealing for 20min in airflow to remove the oxide on the surface of metal foam nickel; pass CH 4 As a carbon source, in Ar:H 2 :CH 4 (400sccm: 200sccm: 100sccm)...

Embodiment 3

[0094] This embodiment provides a lithium-sulfur battery cathode material, the preparation method of which comprises:

[0095] Weigh the active substance sulfur and the monoatomically dispersed nitrogen-doped carbon nanosphere / graphene foam composite material prepared in Example 2 according to 2:1, dissolve the active substance sulfur in the carbon disulfide solution at room temperature and ultrasonically 0.5h to ensure that the active substance The concentration of sulfur is 0.5mol / L, and then use a dropper to measure a small amount of solution dissolved in the active substance sulfur and titrate the single-atom dispersed nitrogen-doped carbon nanosphere / graphene foam composite material in a fume hood. Put the titrated composite material under the fume hood for 3 hours until all the carbon disulfide is volatilized, then put the dried composite material into a polytetrafluoroethylene-lined stainless steel autoclave, and replace it in a nitrogen-filled glove box. Gas treatment,...

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Abstract

The invention relates to the technical field of new energy materials, in particular to a monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, a preparation method and application, wherein carbon nanospheres grow in situ on graphene foam, and the carbon nanospheres are doped with nitrogen atoms and metal single atoms. The preparation method comprises the following steps: preparing graphene foam on the surface of a foam metal template by adopting a vapor deposition method, then growing nitrogen-containing organic nanospheres on the surface of the graphene foam in situ, calcining, and removing the foam template in sequence to obtain the graphene foam doped with nitrogen atoms and metal monatomic carbon nanospheres through in-situ growth. When the obtained composite material is applied to the lithium-sulfur battery, the utilization rate of active substances can be greatly improved, and the overall electrochemical performance is excellent.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a monoatomically dispersed graphene foam, a preparation method and an application of carbon nanospheres doped with nitrogen atoms grown in situ. Background technique [0002] With the rapid development of society, higher requirements are put forward for the performance of electric energy storage systems, especially for the energy density of secondary battery systems. Although traditional lithium-ion batteries have the advantages of high specific energy, high working voltage, long cycle life, and no environmental pollution, the theoretical specific capacity of commercial lithium-ion battery cathode materials generally does not exceed 300Wh kg -1 , cannot effectively meet the higher energy density requirements. Therefore, the development of a new generation of secondary battery system with high theoretical specific capacity has become the focus of current research. I...

Claims

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Application Information

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IPC IPC(8): C01B32/182C01B32/184H01M4/583H01M4/62H01M10/052
CPCC01B32/182C01B32/184H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 李海鹏刘加兵张永光李超杰胡晨晨张娜
Owner HEBEI UNIV OF TECH
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