Flexible capacitor based on macroscopic high-conductivity MXene ribbon fiber and preparation method and application of flexible capacitor

A high-conductivity, capacitor technology, applied in flexible capacitors based on macroscopic high-conductivity MXene ribbon fibers and its preparation, macroscopically high-conductivity MXene ribbon fibers and their preparation, can solve the problem of finite transverse dimensions, MXene Fiber barriers and other issues, to achieve the effect of high volumetric energy density and high electrochemical performance

Active Publication Date: 2020-10-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, although the length of the parent MAX crystals is tens of micrometers, the obtained MXenes mostly exhibit limited lateral dimensions of only a few hundred nanometers, resulting in additional grain boundaries, which constitute a significant factor for the construction of macroscopic MXene fibers. obstacle

Method used

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  • Flexible capacitor based on macroscopic high-conductivity MXene ribbon fiber and preparation method and application of flexible capacitor
  • Flexible capacitor based on macroscopic high-conductivity MXene ribbon fiber and preparation method and application of flexible capacitor
  • Flexible capacitor based on macroscopic high-conductivity MXene ribbon fiber and preparation method and application of flexible capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of Titanium Carbide Colloidal Aqueous Solution: Ti 3 AlC 2 The powder (1 g) was put into HF solution (10 wt%, 30 mL), stirred for 10 minutes, washed with distilled water for 3 times, and then dried in a vacuum oven at 80 °C for 24 hours. The dried powder was placed in tetramethylammonium hydroxide aqueous solution (25 wt%, 10 mL) and stirred continuously for 24 hours; the resulting suspension was centrifuged at 5000 rpm for 10 minutes, and the bottom precipitate was washed with deionized water and dried; then Then re-disperse in deionized water, sonicate at room temperature for 15 minutes, centrifuge at 3500 rpm for 15 minutes, take the upper suspension and centrifuge at 8000 rpm for 15 minutes, and take the lower suspension to obtain a titanium carbide colloidal aqueous solution with a concentration of 20 mg / mL.

[0055] Fill the titanium carbide colloidal aqueous solution into a plastic syringe with a rotating nozzle (conventional stainless steel spinni...

Embodiment 2

[0066] A high-performance flexible supercapacitor was obtained by using the orderly stacked macroscopic high-conductivity MXene ribbon fiber of Example 1 as the negative electrode, and assembling it with polyvinyl alcohol-sulfuric acid electrolyte and positive electrode rGO fiber.

[0067] Using the method of Example 1, the titanium carbide colloidal aqueous solution was replaced by a commercially available GO aqueous solution with a concentration of 10 mg / mL (the thickness of the GO sheet was about 1 nm, and the transverse dimension was 3-5 µm), to obtain GO as-spun fibers, and then immersed in 90 °C hydroiodic acid (57wt%) aqueous solution for 5 hours, and then washed with water to obtain rGO fibers as the cathode.

[0068] Under stirring, 1 g of PVA powder was dissolved in 10 mL of distilled water at 90 °C until a clear solution was obtained. After adding 1 g of sulfuric acid and stirring, the clear solution was cooled to room temperature to obtain a polyvinyl alcohol-sulfur...

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Abstract

The invention discloses a flexible capacitor based on a macroscopic high-conductivity MXene ribbon fiber as well as a preparation method and application of the flexible capacitor. The preparation method comprises the following steps of putting Ti3AlC2 powder into an HF solution, and stirring and washing to obtain a crystal; adding the crystal into a tetramethylammonium hydroxide aqueous solution,stirring, sequentially carrying out centrifugal treatment and washing, re-dispersing in water, and carrying out ultrasonic treatment to obtain a titanium carbide aqueous solution; injecting the titanium carbide aqueous solution into a coagulating bath to obtain the primary spun fibers; and carrying out acid treatment and washing on the primary spinning fibers to obtain the macroscopic high-conductivity MXene strip-shaped fiber with orderly stacked nanosheets, and then assembling the macroscopic high-conductivity MXene strip-shaped fiber with a diaphragm, an electrolyte and a positive electrodeto obtain the flexible capacitor based on the macroscopic high-conductivity MXene strip-shaped fiber. Based on the intrinsic metal conductivity and the directional stacked structure of the Ti3C2 nanosheet, the prepared ribbon fiber has excellent conductivity (up to 2458 S cm <-1 >). The research highlights the huge potential of the MXene as a macroscopic assembly platform, and expands the application of the MXene material in wearable electronic products.

Description

technical field [0001] The invention belongs to the technology of flexible fibrous electrodes, and specifically relates to a macroscopic high-conductivity MXene ribbon fiber and its preparation method and application, and further relates to a flexible capacitor based on a macroscopic high-conductivity MXene ribbon fiber and its preparation method. with application. Background technique [0002] Based on the recent explosive development of miniaturized and wearable electronics, it has become increasingly important to develop flexible fibrous electrodes with high electrical conductivity and reasonable electrochemical performance. Recently, two-dimensional nanosheets with thicknesses on the order of several angstroms and lateral dimensions in the micrometer range have been proposed as ideal materials for constructing macroscopic fibrous electrodes. In particular, fibers with almost perfectly ordered nanosheet structures can maximize the performance utilization of individual na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/40H01G11/86
CPCH01G11/24H01G11/32H01G11/40H01G11/86
Inventor 耿凤霞祝超
Owner SUZHOU UNIV
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