Polyaniline-based MOF nanocomposite flexible supercapacitor and preparation method thereof

Abstract

The invention discloses a polyaniline-based MOF nanocomposite flexible supercapacitor and a preparation method thereof. MIL-101 is one of MOF materials with excellent acid-resistance stability. The method provided by the invention comprises the steps that a PANI / MIL-101 composite material is prepared; the PANI / MIL-101 composite material, acetylene black and polyvinylidene fluoride (PVDF) are uniformly dispersed in N-methyl-2-pyrrolidone (NMP) in a certain proportion to form a slurry, and the slurry is coated on carbon fiber cloth to form electrodes; a gel electrolyte is used to symmetrically stack two electrodes, and the middle space is separated by a diaphragm; and the electrodes are packaged to prepare the flexible supercapacitor. The specific capacity of the electrode material is up to1197 F / g. The prepared supercapacitor has only 10% attenuation of the specific capacity after 1000 times of bending. The cyclic stability test 10000 cycles can maintain more than 90% of the specific capacity. Four supercapacitors are connected in series to light up a 1.8V red LED. The flexible supercapacitor prepared by the invention has good flexibility and electrochemical performance, and has agood application prospect in the aspects of flexible electronic devices and energy storage.

Description

technical field [0001] The invention belongs to the field of energy technology, and specifically relates to a preparation method of a bendable and flexible energy storage element. Further, the invention relates to a polyaniline-based MOF nanocomposite flexible supercapacitor and a preparation method. Background technique [0002] In recent years, as electronic products tend to be more and more portable, flexible and wearable, the corresponding energy storage components have been developed to make them small, light, flexible and high-performance, which has become a research hotspot. Traditional energy storage devices such as batteries and capacitors are basically rigid and rigid, and most of them cannot be bent and folded, and the energy density, power density, and charge-discharge cycle stability need to be improved. Compared with batteries and traditional capacitors, supercapacitors have advantages in energy storage due to their better cycle life and higher power density. ...

AI Technical Summary

Problems solved by technology

[0004] Although polyaniline has many advantages, because the molecular chains of polyaniline are easy to accumulate and the specific surface area is reduced, the charge transport path is blocked, which affects its conductivity.

And the molecular chain will swell or shrink during the charging and discharging process, which will affect its cycle stability.

Many researchers compound it with metal oxides, graphene, carbon nanotubes, etc. to improve its electrochemical performance. However, these methods have not completely solved the problem, and most of them can only partially improve the performance of polyaniline. , and even some methods improve the performance on the one hand but reduce the other part of the performance, such as increasing the charge-discharge cycle stability of polyaniline and reducing its specific capacity

Images