High-performance printable ink, preparation method thereof and application to flexible all-solid-state supercapacitor

A high-performance, flexible electrode technology, applied in the manufacture of electrolytic capacitors, hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the unstudied application of inkjet printing graphene oxide ink, reduce GO specific surface area and adsorption sites , reduce the overall performance of the device and other issues, and achieve excellent cycle stability, excellent electrochemical performance, and smooth ink output

Inactive Publication Date: 2018-10-12
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although inkjet printing of graphene oxide inks has been reported, most of the reports did not study the application of inkjet printing of graphene oxide inks in supercapacitors, and the GO sheets of graphene oxide inks are prone to re-agglomeration during solvent evaporation. And stacking, reducing the specific surface area and adsorption sites of GO, thereby reducing the overall performance of the device

Method used

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  • High-performance printable ink, preparation method thereof and application to flexible all-solid-state supercapacitor
  • High-performance printable ink, preparation method thereof and application to flexible all-solid-state supercapacitor
  • High-performance printable ink, preparation method thereof and application to flexible all-solid-state supercapacitor

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preparation example Construction

[0054] The present invention also provides a method for preparing the above-mentioned high-performance jet-printable ink, comprising the following steps:

[0055] Disperse carbon quantum dots and graphene oxide in a solvent, add a surfactant, mix and stir, then perform ultrasonication and centrifugation to obtain a high-performance jet-printable ink.

[0056] Wherein, the stirring time is 10-60min, preferably 20-40min, the ultrasonic treatment time is 30-120min, preferably 60-100min; the centrifugal rate is 2000rpm-10000rpm, preferably 6000-8000rpm, and the centrifugal time is 5-10min / time .

[0057] The present invention also provides a flexible electrode for a flexible all-solid-state supercapacitor, which is obtained by inkjet printing ink on the surface of a flexible substrate and then drying, and the ink is the above-mentioned high-performance jet-printable ink.

[0058] Wherein, the flexible substrate includes one or more of printing paper, weighing paper, mirror paper,...

Embodiment 1

[0081] Preparation of carbon quantum dots: Mix 100mg fullerene and 3g potassium hydroxide into a nickel crucible, and then put it into a tube furnace for high temperature activation reaction. The activation temperature is 600°C, the activation time is 10min, and the argon flow rate is 300sccm. After the reaction, quickly pull out the nickel crucible from the tube furnace, cool it at room temperature, wash it with deionized water, and filter it with a PTFE hydrophilic membrane with a pore size of 1 μm and 0.22 μm. The dialysis bag is dialyzed until the eluate is neutral, then the dialysate in the dialysis bag is evaporated in a water bath at a temperature of 60°C, and finally the evaporated solution is placed in a freeze dryer for freeze-drying to obtain carbon quantum Dot powder.

[0082] see figure 2 , figure 2 The middle picture (a) is the transmission electron microscope image of the carbon quantum dots prepared by the high-temperature activation method in Example 1. It...

Embodiment 2

[0084] Preparation of carbon quantum dots: Mix 100mg fullerene and 3g sodium hydroxide into a nickel crucible, and then put it into a tube furnace for high temperature activation reaction. The activation temperature is 700°C, the activation time is 6min, and the argon flow rate is 300sccm. After the reaction, quickly pull out the nickel crucible from the tube furnace, cool it at room temperature, wash it with deionized water, and filter it with a PTFE hydrophilic membrane with a pore size of 1 μm and 0.22 μm. The dialysis bag is dialyzed until the eluate is neutral, then the dialysate in the dialysis bag is evaporated in a water bath at a temperature of 60°C, and finally the evaporated solution is placed in a freeze dryer for freeze-drying to obtain carbon quantum Dot powder.

[0085] see figure 2 , figure 2 (b) is the transmission electron microscope image of the carbon quantum dots prepared by the high-temperature activation method of sodium hydroxide in Example 2. The s...

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Abstract

The invention provides high-performance printable ink. The high-performance printable ink is prepared from carbon quantum dots, graphene oxide, a surfactant and a solvent, wherein the carbon quantum dots and graphene oxide have a stronger synergistic effect and can effectively improve overall performance of the material. According to the mixed ink prepared by modifying graphene oxide with the carbon quantum dots, the carbon quantum dots as spacers between graphene oxide layers effectively prevent graphene oxide from stacking again, and meanwhile, the carbon quantum dots generally contain moreoxygen-containing functional groups and open edges and provide more reaction sites for pseudocapacitance, so that a carbon quantum dot/graphene oxide mixed electrode shows better electrochemical capacity and cyclic stability as compared with single carbon quantum dot electrode or single graphene oxide electrode.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a high-performance jet-printable ink, a preparation method thereof, and an application in flexible all-solid supercapacitors. Background technique [0002] With the development of wearable and miniaturized electronic devices, there is a growing demand for lightweight and flexible energy storage devices. Flexible supercapacitors (SCs) have attracted extensive attention due to their fast charge-discharge rate, high power density, long cycle life, and good bending. At present, the preparation method of flexible supercapacitor mainly adopts solution deposition method. For example, spraying method, blade coating method, dip-drying method, vacuum filtration method and the like. However, the above methods cannot control the electrode geometry, film thickness, loading and uniformity well. Although some literatures have reported that the template method is used to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/30H01G11/86H01G11/22
CPCC09D11/30H01G11/22H01G11/86Y02E60/13
Inventor 朱彦武刘杰
Owner UNIV OF SCI & TECH OF CHINA
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