Carbon nanosphere containing single atom Fe and preparation method thereof and application

A carbon nanosphere, nanosphere technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the limitation of excessive dependence on equipment and processing, poor chemical stability, and poor ionic conductivity Commercial application and other issues, to achieve the effect of maintaining electrochemical integrity, low price, and good cycle stability

Inactive Publication Date: 2019-09-27
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with liquid electrolytes, the former has no disadvantages of leakage, flammability, and poor chemical stability, and has a higher mechanical modulus, which can solve safety problems well, but its poor ionic conductivity limits its commercial application.
The latter can use methods such as scrape coating, magnetron sputtering, and atomic layer deposition to coat a protective layer similar to the SEI film on the surface of the lithium negative electrode, which has strong orientation and can obtain an interface layer of a specific composition, but excessive Depends on equipment and process

Method used

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  • Carbon nanosphere containing single atom Fe and preparation method thereof and application
  • Carbon nanosphere containing single atom Fe and preparation method thereof and application
  • Carbon nanosphere containing single atom Fe and preparation method thereof and application

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preparation example Construction

[0021] The preparation method of carbon nanospheres containing monoatomic Fe of the present invention comprises the following steps: (a) adding pyrrole to water, carrying out a polymerization reaction under the action of an iron-containing catalyst and an oxidizing agent to obtain a polypyrrole sphere dispersion; said pyrrole, The ratio of iron-containing catalyst, oxidizing agent and water is preferably 1~3ml: 0.1~0.4g: 8~12ml: 70~110ml; (b) drying the polypyrrole ball dispersion to obtain Fe-containing nanosphere precursor; (c ) placing the Fe-containing nanosphere precursor in an inert atmosphere for calcination and carbonization. The present invention uses a simple, template-free method to synthesize a nitrogen-doped carbon nanosphere material (Fe for short) that contains single-atom Fe. SA -N-C; if it is elemental Fe or other nanoclusters, it will be dissolved, and the signal of Fe cannot be detected, but the signal of Fe can still be detected by synchrotron radiation tes...

Embodiment 1

[0026] This embodiment provides a method for preparing carbon nanospheres containing monoatomic Fe and its application, including the following steps:

[0027] (a) At room temperature, add 50mLH to the beaker 2 O, 2mL pyrrole, mix well; then add 40ml H 2 O, 0.2g FeCl 2 4H 2 O, mix well, slowly drop 10mL H 2 o 2 (mass concentration is 20%), the solution turns black rapidly (10~30 ℃), stirs 6h to obtain polypyrrole ball dispersion liquid;

[0028] (b) freeze-drying the polypyrrole sphere dispersion to obtain a Fe-containing nanosphere precursor;

[0029] (c) Place the Fe-containing nanosphere precursor in a tube furnace and calcinate at 900°C for 2 h in an argon atmosphere (200 sccm) to obtain carbon nanospheres containing monoatomic Fe (ie, Fe SA -N-C nanosphere material); its energy spectrometer elemental analysis diagram high-angle annular dark field scanning transmission electron microscope diagram is as follows figure 1 As shown, the scanning electron microscope imag...

Embodiment 2

[0034] This embodiment provides a method for preparing carbon nanospheres containing monoatomic Fe and its application, which is basically the same as that in Example 1, except that in step (a), pyrrole and FeCl 2 4H 2 The amount of O used was 3ml and 0.4g, respectively.

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Abstract

The invention relates to a carbon nanosphere containing single atom Fe and a preparation method thereof and application. The method comprises the following steps: (a) pyrrole is added to water, polymerization is conducted under effects of an iron-containing catalyst and an oxidizing agent, and a polypyrrole spherical dispersion is obtained; (b) the polypyrrole spherical dispersion is dried to obtain a Fe-containing nanosphere precursor; and (c) the Fe-containing nanosphere precursor is placed in an inert atmosphere for calcination and carbonization. A simple and template-free method is used to synthesize a single atom Fe-containing nitrogen-doped carbon nanosphere material, the nucleation overpotential of lithium dendrites can be reduced due to the existence of the single atom Fe, the lithium dendrites are made for uniform nucleation on the surface of a negative electrode, and growth of the lithium dendrites is suppressed; and on the other hand, with the carbon nanosphere structure, the mechanical tension generated by volume expansion can be well blended, and the electrochemical integrity of the structure is kept.

Description

technical field [0001] The invention belongs to the field of lithium metal batteries, and in particular relates to an iron-containing carbon nanosphere, in particular to a carbon nanosphere containing single-atom Fe, and a preparation method and application thereof. Background technique [0002] The gradual shortage of traditional fossil energy and its adverse impact on the environment have accelerated people's research on clean energy and renewable energy. As a kind of clean energy, electric energy has attracted widespread attention, among which rechargeable batteries have provided energy security for portable electronic devices and electric vehicles in the past ten years. In the new energy storage system, the lithium metal anode is characterized by its extremely high theoretical capacity (3860mA h / g), extremely low chemical potential (-3.040V vs standard hydrogen electrode), and low density (0.534g cm -3 ), which has aroused extensive attention of researchers. [0003] H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/587H01M4/628H01M10/052Y02E60/10
Inventor 钱涛孙雅雯周金秋晏成林
Owner SUZHOU UNIV
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