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Preparation method and application of HHK-CC@-MXenes composite flexible electrode material

A HHK-CC, flexible electrode technology, applied in the field of preparation of HHK-CC@MXenes composite flexible electrode materials, can solve the problems of mechanical strength, cost synthesis process limitations, large-scale production obstacles, etc., to achieve low cost, structure Stable and simple method

Pending Publication Date: 2020-02-14
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if self-supporting MXene films are used as flexible electrodes, they are not mechanically strong enough to be subjected to bending cycles for a long time.
In addition, the high cost and complicated synthesis process limit their further development in flexible electrode energy storage devices, and large-scale production is hindered.

Method used

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  • Preparation method and application of HHK-CC@-MXenes composite flexible electrode material
  • Preparation method and application of HHK-CC@-MXenes composite flexible electrode material
  • Preparation method and application of HHK-CC@-MXenes composite flexible electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 3g MAX precursor to 20ml 6mol L -1 Solution of HCl and 2.0g LiF, etch at 30°C for 60h, remove phase A to obtain multilayer Ti 3 C 2 T X . Take 1g multilayer Ti 3 C 2 T X Firstly, the intercalation was carried out in 8ml DMSO solution for 10min, then the excess DMSO was washed away with deionized water, and the obtained material was ultrasonically exfoliated for 4h. The resulting suspension was then centrifuged at 8000 rpm to remove unstripped Ti 3 C 2 T X , centrifuged to obtain the supernatant, that is, to obtain a single layer or few layers of Ti with a solid content of 12mg / ml 3 C 2 T X nanosheet solution, the Ti3 C 2 T X The nanosheet solution was diluted to a solid content of 2 mg / ml for use.

[0033] Immerse 0.5g CC in a solution containing 2g potassium permanganate, 15ml concentrated sulfuric acid and 15ml concentrated nitric acid and activate at 30°C for 8h to obtain HHK-CC; 3 C 2 T X The nanosheets are uniformly drop-coated on the oxidized ...

Embodiment 2

[0036] Add 3g MAX precursor to 30ml 6mol L -1 A solution of HCl and 2.0g LiF was etched at 40°C for 50h to remove phase A to obtain multilayer Ti 3 C 2 T X . Take 1g multilayer Ti 3 C 2 T X Firstly, the intercalation was carried out in 10ml DMSO solution for 20min, then the excess DMSO was washed away with deionized water and the obtained material was ultrasonically exfoliated for 5h. The resulting suspension was centrifuged at 10,000 rpm to remove unstripped Ti 3 C 2 T X , centrifuged to obtain the supernatant, that is, to obtain a single layer or few layers of Ti with a solid content of 12mg / ml 3 C 2 T X nanosheet solution, the Ti 3 C 2 T X The nanosheet solution was diluted to a solid content of 2 mg / ml for use.

[0037] Immerse 0.5g CC in a solution containing 2g potassium permanganate, 20ml concentrated sulfuric acid and 10ml concentrated nitric acid and activate at 40°C for 7h to obtain HHK-CC; 3 C 2 T X The nanosheets are uniformly drop-coated on the o...

Embodiment 3

[0040] Add 3g MAX precursor to 30ml 6mol L -1 Solution of HCl and 3.0g LiF, etch at 50°C for 40h, remove phase A to obtain multilayer Ti 3 C 2 T X . Take 1g multilayer Ti 3 C 2 T X Firstly, the intercalation was carried out in 12ml DMSO solution for 20min, then the excess DMSO was washed away with deionized water and the obtained material was ultrasonically exfoliated for 5h. The resulting suspension was centrifuged at 10,000 rpm to remove unstripped Ti 3 C 2 T X , centrifuged to obtain the supernatant, that is, to obtain a single layer or few layers of Ti with a solid content of 12mg / ml 3 C 2 T X nanosheet solution, the Ti 3 C 2 T X The nanosheet solution was diluted to a solid content of 2 mg / ml for use.

[0041] Immerse 0.5g CC in a solution containing 3g potassium permanganate, 10ml concentrated sulfuric acid and 20ml concentrated nitric acid and activate at 50°C for 6h to obtain HHK-CC; 3 C 2 T X The nanosheets are uniformly drop-coated on the oxidized c...

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Abstract

The invention relates to a preparation method of an HHK-CC@-MXenes composite flexible electrode material. The method includes S1) a step of etching preparation of a multilayer Ti3C2TX material, namelya step of immersing an MAX precursor into a solution of HCl and LiF for etching to remove a phase A in the MAX precursor to obtain the multilayer Ti3C2TX material; S2) a step of screening of single-layer or few-layer Ti3C2TX nanosheet materials; S3) a step of HHK-CC preparation, namely a step of immersing CC into a strong oxidizing acid solution to be oxidized and activated to obtain HHK-CC; andS4) a step of drop casting of the HHK-CC obtained in the step S3 with a solution containing the single-layer or few-layer Ti3C2TX nanosheets. Compared with the prior art, the HHK-CC@MXenes composite electrode material is prepared by forming a film on activated CC by using a small amount of few-layer or single-layer Ti3C2TX, so that the mechanical strength of the electrode material is enhanced, theuse amount of Ti3C2TX is reduced, and the hydrophilicity of the electrode material is very good; a direct drop casting method is adopted for preparation so that the process is simple and the equipment cost is low, and the supercapacitor flexible electrode material which is stable in structure and excellent in performance can be obtained.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a preparation method and application of a HHK-CC@MXenes composite flexible electrode material. Background technique [0002] Electrochemical capacitors, known as supercapacitors, are considered to be a promising device for next-generation energy storage due to their high capacity, high power density, long lifetime, and low cost. Supercapacitors can be divided into two categories. The first type: electric double layer capacitor, which stores electric energy through the electrostatic adsorption of the electrode material to the charge, and its electrochemical performance is closely related to the conductivity, specific surface area and pore structure of the electrode material; the second type: pseudocapacitance capacitor, pseudocapacitance Capacitive capacitors store energy through fast and reversible redox reactions of electrode materials, and the theoretical specific ...

Claims

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Application Information

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IPC IPC(8): C01B32/90C01B32/05H01G11/24H01G11/30H01G11/32
CPCC01B32/90C01B32/05H01G11/24H01G11/30H01G11/32C01P2004/03C01P2006/40Y02E60/13
Inventor 鲁彦王利李林鲜郭建宇张斯勇方杰
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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