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Carbon nanotube-mxene composite three-dimensional porous carbon material and preparation method thereof

A carbon nanotube and three-dimensional porous technology, which is applied in the field of negative electrode materials, can solve the problems of loose structure of graphene/MXene composite materials, difficulty in overcoming the agglomeration effect of graphene sheets, and difficulty in realizing large-scale industrial production, so as to improve the unit capacity and cycle stability, easy industrial production, and low cost effects

Active Publication Date: 2021-01-26
四川翔丰华新能源材料有限公司 +1
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Problems solved by technology

Three-dimensional porous carbon materials have become ideal materials for supercapacitor electrodes due to their excellent properties. At present, the preparation methods of porous carbon materials mainly include catalytic activation method, template method, organogel carbonization method and polymer blend carbonization method, etc., but there are The method is cumbersome, expensive and other shortcomings, it is difficult to realize large-scale industrial production, and it is particularly important to realize the preparation method of high-performance porous carbon materials with low cost, simple method and adjustable pore size
The above methods are difficult to overcome the agglomeration effect of graphene sheets, but the prepared graphene / MXene composites have a loose structure and poor mechanical strength

Method used

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preparation example Construction

[0027] The invention discloses a method for preparing a carbon nanotube-MXene composite three-dimensional porous carbon material, comprising the following steps:

[0028] (1) Take the ternary layered MAX ceramic powder and selectively etch away the A atomic layer in HF solution, centrifuge washing, and vacuum drying to obtain the MXene material; the MAX ceramic powder is Ti 3 AlC 2 、Ti 2 AlC, Ti 3 SiC 2 One or two of them, powder particle size D50=10-75μm; HF concentration for selective etching is 10-40wt%, the dosage is material weight (g) / liquid volume (mL) = 20-30, etching The temperature is 40-80°C, the reaction time is 10-80 h, after etching, it is centrifuged and washed with deionized water until the pH=5-6; the speed of centrifugal separation is 2000-4000rpm, and the temperature of vacuum drying is 40-100°C.

[0029] (2) Put MWNTs (multi-walled carbon nanotubes) in a mixed solution of concentrated nitric acid and concentrated sulfuric acid for reflux purification, c...

Embodiment 1

[0035] A preparation method of carbon nanotube-MXene composite three-dimensional porous carbon material, comprising the following steps:

[0036](1) Take the ternary layered MAX ceramic powder and selectively etch away the A atomic layer in HF solution, centrifuge washing, and vacuum drying to obtain the MXene material; the MAX ceramic powder is Ti 3 AlC 2 , powder particle size D50=10μm; HF concentration for selective etching is 10wt%, dosage is material weight (g) / liquid volume (mL) = 20, etching temperature is 40°C, reaction time is 10h, after etching Centrifuge and wash with deionized water until pH=5; the rotational speed of centrifugal separation is 2000 rpm, and the temperature of vacuum drying is 40°C.

[0037] (2) Put MWNTs (multi-walled carbon nanotubes) in a mixed solution of concentrated nitric acid and concentrated sulfuric acid for reflux purification, centrifuge and wash until neutral to obtain an aqueous solution of carbon nanotubes, then add the MXene materia...

Embodiment 2

[0042] A preparation method of carbon nanotube-MXene composite three-dimensional porous carbon material, comprising the following steps:

[0043] (1) Take the ternary layered MAX ceramic powder and selectively etch away the A atomic layer in HF solution, centrifuge washing, and vacuum drying to obtain the MXene material; the MAX ceramic powder is Ti 2 AlC, powder particle size D50=75μm; HF concentration for selective etching is 40wt%, the dosage is material weight (g) / liquid volume (mL) = 30, etching temperature is 80°C, reaction time is 80 h, etching After etching, it was centrifuged and washed with deionized water until pH = 6; the rotation speed of centrifugation was 4000 rpm, and the temperature of vacuum drying was 100°C.

[0044] (2) Put MWNTs (multi-walled carbon nanotubes) in a mixed solution of concentrated nitric acid and concentrated sulfuric acid for reflux purification, centrifuge and wash until neutral to obtain an aqueous solution of carbon nanotubes, then add t...

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Abstract

The invention discloses a preparation method of a carbon nanotube-MXene composite three-dimensional porous carbon material. The invention utilizes the hydrophilicity of the MXene material to disperse it in a carbon nanotube stabilizing liquid, and then adds it into a PVA aqueous solution to form a uniformly dispersed stable system, three-dimensional porous composite carbon materials were obtained by freeze-drying and carbonization. In the preparation method, carbon nanotubes can be inserted into the two-dimensional layer structure of MXene to prevent sheet agglomeration, increase specific surface area, expand ion migration space, and help improve unit capacity and cycle stability. The invention solves the problem that MXene materials and graphene materials are not easy to disperse evenly, and prepares a composite three-dimensional porous carbon material with mainly medium and large pores. The preparation method is simple, environmentally friendly, low in cost, high in yield, and easy for industrial production.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a carbon nanotube-MXene composite three-dimensional porous carbon material and a preparation method thereof. Background technique [0002] Porous carbon material has become a new type of rapidly developed new material system in recent years. It has light weight, large specific surface area, high toughness, high modulus, good stability, high temperature resistance, acid and alkali resistance, non-toxicity, and adsorption capacity. Good, easy to process and other excellent properties; carbon nanotubes are a one-dimensional nanomaterial with a hexagonal stable structure, which has excellent electrical, mechanical and chemical properties. Combining the properties of carbon nanotubes, many composite materials with excellent performance can be produced. Material. Carbon nanotube-based three-dimensional porous carbon materials not only have the physical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/32H01G11/36H01M4/36H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01G11/24H01G11/32H01G11/36H01G11/86H01M4/364H01M4/587H01M4/628H01M10/052Y02E60/10
Inventor 邱从交赵东辉周鹏伟
Owner 四川翔丰华新能源材料有限公司
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