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Carbon fiber composite material containing single-layer MXene nanosheet as well as preparation and application thereof

A technology of composite materials and nanosheets, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. It can solve the problem of large sheet size, inability to inhibit the agglomeration of MXene sheets, and difficulty in embedding carbon fibers, etc. problems, to achieve the effects of inhibiting agglomeration, excellent long-term cycling, excellent rate performance and long-term cycling performance

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large size of MXene sheets after peeling and delamination, it is difficult to embed them into carbon fibers, thus failing to inhibit the agglomeration of MXene sheets.

Method used

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  • Carbon fiber composite material containing single-layer MXene nanosheet as well as preparation and application thereof
  • Carbon fiber composite material containing single-layer MXene nanosheet as well as preparation and application thereof
  • Carbon fiber composite material containing single-layer MXene nanosheet as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Take Ti 3 SiC 2 Ti 3 SiC 2 ; Take 2g of the smaller size MAX phase obtained above and add to 20mL 9mol L -1 Hydrochloric acid and 2g LiF solution, the reaction mixture was stirred at room temperature for 36h, filtered and washed, and dried at room temperature to obtain multilayer Ti 3 C 2 T x MXene.

[0037] (2) Take 1g of the multilayer Ti obtained above 3 C 2 T x Monolayer MXene nanosheets can be obtained by ultrasonicating MXene at a power of 600 W for 2 h in an inert atmosphere.

[0038] (3) Take 0.2g of single-layer MXene nanosheets obtained in step (2), 0.84g of polyacrylonitrile, and 8.4mL of N,N-dimethylformamide in a sealed container, and after 4 hours of stirring and 4 hours of ultrasound, the composition Highly dispersed and stable electrospinning precursor solution.

[0039] (4) The prepared electrospinning precursor solution is loaded into the syringe, and the high-voltage electrospinning machine is operated at 18Kv, and the blunt needle p...

Embodiment 2

[0042] (1) Take Ta 3 AlC 2 Ta 3 AlC 2 ; Take 2g of the smaller size MAX phase obtained above and add to 15mL6mol L -1 Hydrochloric acid and 3g LiF solution, the reaction mixture was stirred at room temperature for 24h, filtered and washed, and dried at room temperature to obtain multilayer Ta 3 C 2 T x MXene.

[0043] (2) Take 1g of the multilayer Ta obtained above 3 C 2 T x MXene monolayer MXene nanosheets can be obtained by ultrasonication at 600W power for 1h in an inert atmosphere.

[0044] (3) Take 0.3g of single-layer MXene nanosheets obtained in step (2), 0.8g of polyterephthalic acid, and 10mL of N-methylpyrrolidone in a sealed container. After 6 hours of stirring and 6 hours of ultrasound, the composition is highly dispersed, Stable electrospinning precursor solution.

[0045] (4) The prepared electrospinning precursor solution is loaded into the syringe, and the high-voltage electrospinning machine is operated at 18Kv, and the blunt needle push speed is...

Embodiment 3

[0048] (1) Take Nb 4 AlC 3 20g, 200g of zirconium balls (grinding media), ball milled for 36h at a speed of 400rpm to obtain smaller Nb 4 AlC 3 ; Take 2g of the smaller size MAX phase obtained above and add to 20mL5mol L -1 Hydrochloric acid and 2.5g LiF solution, the reaction mixture was stirred at room temperature for 20h, filtered and washed, and dried at room temperature to obtain multilayer Nb 4 C 3 T x MXene.

[0049] (2) Take 1g of the multilayer Nb obtained above 4 C 3 T x Monolayer MXene nanosheets can be obtained by ultrasonicating MXene at a power of 600 W for 6 h in an inert atmosphere.

[0050] (3) Take 0.2 g of single-layer MXene nanosheets obtained in step (2), 0.15 g of polyvinyl butyral, and 10 mL of hexafluoroisopropanol in a sealed container, and after 8 hours of stirring and 8 hours of ultrasound, the composition is highly dispersed , Stable electrospinning precursor solution.

[0051] (4) The prepared electrospinning precursor solution is loa...

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Abstract

The invention belongs to the field of composite materials, and discloses a carbon fiber composite material containing a single-layer MXene nanosheet as well as preparation and application thereof. Thepreparation method comprises the steps of carrying out high-energy ball milling pretreatment and etching treatment on a micron-sized MAX-phase ceramic material to obtain two-dimensional layered MXene, and carrying out ultrasonic stripping to obtain a single-layer MXene nanosheet; mixing the single-layer MXene nanosheet, a soluble high-molecular polymer and an organic solvent to obtain a spinningprecursor solution, carrying out electrostatic spinning, and carrying out pre-oxidation and carbonization treatment to obtain the carbon fiber composite material containing the single-layer MXene nanosheet. The material has unique structural advantages, the obtained single-layer MXene nanosheet can be well embedded into the carbon fiber, the obtained composite material is good in conductivity andlarge in specific surface area, and the potassium ion / electron diffusion path can be effectively shortened. The material has the characteristics of high specific capacity, good long-period cycle performance, excellent rate capability and the like when being applied to a potassium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a carbon fiber composite material containing single-layer MXene nanosheets and its preparation and application. Background technique [0002] With the continuous development of modern society and the deterioration of the ecological environment brought about by traditional fossil energy, people have paid great attention to electrochemical energy storage devices with long life and low cost. Commercial lithium-ion batteries (LIBs) have been more and more widely used in energy portable devices and so on. However, limited lithium resources and high prices limit the further application of LIBs in large-scale energy storage systems. Therefore, it is particularly necessary to develop energy storage devices with low cost, high safety and excellent performance. Compared with Li-ion batteries, Potassium-ion batteries (PIBs) have more advantages, such as low price, abundant r...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/587H01M10/054B82Y30/00
CPCH01M4/587H01M4/58H01M10/054B82Y30/00Y02E60/10
Inventor 吴松平杜丽严玉蓉续安鼎张申魁夏琪
Owner SOUTH CHINA UNIV OF TECH
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