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Self-supporting MXene/MWCNT flexible composite film, and preparation method and application thereof

A composite film, self-supporting technology, used in cable/conductor manufacturing, hybrid/electric double-layer capacitor manufacturing, equipment for manufacturing conductive/semiconducting layers, etc. Fast transport, affecting the specific capacitance and rate performance of MXene electrode materials, poor electrochemical performance, etc., to achieve the effect of retaining physical and chemical structural integrity, improved storage and transport performance, and good structural stability

Active Publication Date: 2021-08-06
北京理工大学前沿技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interlayer stacking phenomenon caused by the van der Waals force between MXene layers inhibits the effective use of surface active sites and hinders the rapid transport of ions inside the material.
As a result, the specific capacitance and rate performance of MXene electrode materials are affected, which limits its expansion in various fields.
[0003] The use of MXene and MWCNT to prepare MXene / MWCNT flexible composite films has been disclosed in the prior art, but the prepared MXene / MWCNT flexible composite films still have the problem of poor electrochemical performance

Method used

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  • Self-supporting MXene/MWCNT flexible composite film, and preparation method and application thereof
  • Self-supporting MXene/MWCNT flexible composite film, and preparation method and application thereof

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preparation example Construction

[0036] The invention provides a method for preparing a self-supporting MXene / MWCNT flexible composite film, comprising the following steps;

[0037] Ti 2 CT x The MXene colloidal solution is first filtered on the composite fiber filter membrane to form the first film layer;

[0038] performing a second filtration on the first film layer of the multi-walled carbon nanotube dispersion to form a first MWCNT layer;

[0039] On the first MWCNT layer, repeat the first filtration and the second filtration in sequence, and finally filter the Ti 2 CT x MXene colloidal solution to obtain a composite film;

[0040] After the composite film is freeze-dried, the composite fiber filter membrane is removed to obtain the self-supporting MXene / MWCNT flexible composite film.

[0041] In the present invention, Ti 2 CT x The MXene colloidal solution is first filtered on the composite fiber filter membrane to form the first film layer.

[0042] In the present invention, the composite fi...

Embodiment 1

[0090] (1) Add 1g LiF to 20mL 6M HCl solution, stir and react in a 100mL Teflon beaker for 30min to prepare an acidic hydrogen fluoride solution;

[0091] (2) The ceramic material MAX phase 1g Ti 2 AlC powder (200 mesh) was added to the solution in step (1), the stirring speed was 250rpm, the temperature was 35°C, and the reaction time was 72h;

[0092] (3) Add 60 mL of deionized water to the step (2) at the end of the reaction, put it into four 50 mL centrifuge tubes, centrifuge at a speed of 3500 rpm, and wash with deionized water until the pH value is 6;

[0093] (4) Add alcohol with a purity of 99.99% in step (3), and transfer to a gas collecting bottle for ultrasonic stripping. At the same time, an inert gas is introduced to prevent MXene from being oxidized during the stripping process;

[0094] (5) Step (4) stripped Ti 2 CT x Transfer the solution to a 50mL centrifuge tube, vibrate manually for further layering, and centrifuge to get the supernatant, the color of th...

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Abstract

The invention provides a self-supporting MXene / MWCNT flexible composite film, and a preparation method and application thereof, and belongs to the field of composite materials. The preparation method comprises the following steps: carrying out first filtration on a Ti2CTx MXene colloidal solution on a composite fiber filter membrane, carrying out second filtration on an MWCNT dispersion liquid on an obtained first thin film layer, sequentially and circularly repeating the first filtration and the second filtration on the obtained first MWCNT layer, finally filtering the Ti2CTx MXene colloidal solution, carrying out vacuum freeze drying, and removing the composite fiber filter membrane to obtain the self-supporting MXene / MWCNT flexible composite film. The interlayer structure of the MXene / MWCNT composite film electrode prepared by adopting the vacuum freeze drying technology is looser, the interlayer spacing is larger, the storage and transmission performance of ions between the layers is remarkably improved, more electrode / electrolyte interfaces are exposed, an open and firm structure is established, and the structural stability is improved.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a self-supporting MXene / MWCNT flexible composite film and its preparation method and application. Background technique [0002] MXene is a novel two-dimensional transition metal carbon / nitride material with the general chemical formula M n+1 x n T x (n=1, 2 or 3), where M represents a transition metal, X represents C or N, T x Represents a surface group (such as -O, -OH, or -F). MXene mainly etches the A atomic layer in the precursor MAX phase by selective etching to form a two-dimensional layered structure, which has the characteristics of metal-like conductivity, excellent hydrophilicity, abundant surface functional groups and pseudocapacitance. , has attracted extensive attention of researchers in the field of electrochemical energy storage such as secondary batteries, supercapacitors and catalysis. However, the interlayer stacking phenomenon caused by the van...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B5/14H01G11/86H01G11/24H01G11/26H01G11/30H01G11/32H01G11/36B82Y30/00B82Y40/00
CPCH01B13/0026H01B5/14H01G11/86H01G11/24H01G11/26H01G11/32H01G11/36H01G11/30B82Y40/00B82Y30/00
Inventor 陈人杰潘新慧范二莎李丽吴锋
Owner 北京理工大学前沿技术研究院
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