Si@ MXene nano composite material and preparation method thereof

A nano-composite material and nano-silicon technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of unsuccessfully perfecting the application of silicon and MXene battery anode materials, material pulverization structure damage, uneven dispersion, etc. Achieve the effects of easy control of shape, change of shape and saving operation time

Active Publication Date: 2020-11-20
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of material pulverization structure damage caused by the volume expansion of silicon during charging and discharging still exists, and the loading of silicon is not high and the dispersion is uneven, and it is easy to agglomerate
Therefore, the application of silicon and MXene as battery anode materials has not been successfully perfected

Method used

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  • Si@ MXene nano composite material and preparation method thereof
  • Si@ MXene nano composite material and preparation method thereof
  • Si@ MXene nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Si@MXene composites were prepared according to the following steps:

[0037] 1) Add 2g precursor Ti 3 AlC 2 Mix with 30mL hydrofluoric acid, stir at room temperature for 30min, then stir at 35°C for 24h, separate, adjust the pH to weak acidity, and then dry at 60°C for 12h to obtain MXene in the form of black powder.

[0038] 2) Take 0.2g of the prepared MXene sample, add 30mL NaOH with a concentration of 1M and mix well, then add 0.68mL H 2 o 2 , after ultrasonication for 10 min, heat at 140°C for 12 h, then adjust the pH to weak alkaline, separate and dry to obtain a gray three-dimensional-MXene sample. Using the JSM-7001F scanning electron microscope to photograph the material morphology, it can be found that the MXene before treatment is layered and stacked ( figure 1 a), The morphology of the treated MXene changes obviously, the interlayer distance increases, and the three-dimensional structure of the flower bouquet ( figure 1 b), zooming in on one of the regi...

Embodiment 2

[0043] Si@MXene composites were prepared according to the following steps:

[0044] 1) Mix 2g lithium fluoride and 30mL HCl with a concentration of 9M, stir for 30min and add 2g precursor Ti 3 AlC 2 , stirred at room temperature for 30 min, then stirred at 35°C for 24h, separated, adjusted the pH to weak acidity, and dried at 60°C for 12h to obtain MXene in the form of black powder.

[0045] 2) Take 0.2 g of the prepared MXene sample, add 30 mL of 1M NaOH and mix well, then add 0.68 mL of H 2 o 2 , after ultrasonication for 10 minutes, store at 140°C for 12 hours at a constant temperature, then adjust the pH to weak alkaline, separate and dry to obtain a gray three-dimensional MXene sample.

[0046] 3) Disperse 0.12g of nano-silicon in 30mL of PDDA-water with a concentration of 10mg / mL, and the resulting mixed solution is a silicon-modified solution with a concentration of 4mg / mL. In addition, 0.24 g of MXene was used to prepare a water-three-dimensional MXene dispersion w...

Embodiment 3

[0049] Si@MXene composites were prepared according to the following steps:

[0050] 1) Mix 2g lithium fluoride and 30mL HCl with a concentration of 9M, stir for 30min and add 2g precursor Ti 3 AlC 2 , stirred at room temperature for 30 min, then stirred at 35°C for 24h, separated, adjusted the pH to weak acidity, and dried at 60°C for 12h to obtain MXene in the form of black powder.

[0051] 2) Take 0.2 g of the prepared MXene sample, add 30 mL of 1M NaOH and mix well, then add 0.68 mL of H 2 o 2 After ultrasonication for 10 min, the temperature was maintained at 140°C for 12 h, then the pH was adjusted to weak alkaline, separated and dried to obtain a gray three-dimensional MXene sample.

[0052] 3) Disperse 0.12g of nano-silicon in 30mL of iodine-acetone with a concentration of 10mg / mL to obtain a silicon-modified solution with a concentration of 4mg / mL of the mixed solution. In addition, 0.12 g of MXene was used to prepare a water-three-dimensional MXene dispersion with...

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Abstract

The invention discloses a Si@ MXene nano composite material and a preparation method thereof. The Si@ MXene nano composite material is composed of MXenes, nano silicon loaded on the MXenes and a hardcarbon layer coated on the surface of the MXenes. The Si@ MXene is a composite material obtained by mixing three-dimensional MXene with a modified nano-silicon solution, dropwise adding the mixture into an organic polymer solution, separating out a solid product and carrying out annealing treatment in an inert atmosphere. According to the method, MXene can be changed into a three-dimensional structure and then compounded with modified silicon, the nano composite material with larger nanosheet pores and channels, larger interlayer spacing and more active sites is prepared, and the capacity andmultiplying power of the battery can be further improved when the composite material is used as a lithium / sodium ion battery anode material.

Description

technical field [0001] The invention relates to the field of battery negative electrode materials, in particular to a Si@MXene nanocomposite material and a preparation method thereof. Background technique [0002] MXene is a graphene-like material with the molecular formula M n+1 x n , wherein M is an early transition metal element, including at least one of Ti, Mo, Zr, V and other elements. X is C or / and N. MXene has a mixed bond between atoms, so it has excellent electrical and thermal conductivity. Under simple experimental conditions, the regulation of layer spacing and the transformation of material dimensions can be realized, which will facilitate the intercalation-extraction of ions and weaken the self-stacking phenomenon. At the same time, the surface is rich in functional groups, which can be compounded with other materials to expand the application field through the regulation of them. However, two-dimensional materials such as graphene, transition metal oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 王慧奇苟立李莹王美张锦芳贾素萍张会念曹红红胡胜亮
Owner ZHONGBEI UNIV
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