Flexible and tailorable solid super capacitor and preparation method thereof

Abstract

The invention relates to a flexible and tailorable solid super capacitor and a preparation method thereof. The super capacitor uses carbon nanotube/polyaniline composite films as electrodes and a polyacrylamide/lithium chloride hydrogel system as electrolyte and a flexible substrate. The flexible and tailorable carbon nanotube/polyaniline composite electrodes are prepared by depositing polyanilineon carbon nanotube films through electrochemical deposition. The two carbon nanotube composite electrodes are isolated by polyacrylamide/lithium chloride hydrogel prepared in advance. Then, the electrodes are permeated by hydrogel pre-polymerized solution, and crosslinking polymerization is carried out, thus obtaining a flexible and tailorable solid super capacitor with high performance. Comparedwith the prior art, the volume specific capacity of the super capacitor is up to 99F cm<-3>, it takes more than 10 hours to reduce the open circuit voltage to half the original, and the super capacitor shows excellent self-discharge performance. The super capacitor obtained is very flexible, can be bent to any shape, and has no performance degradation even after 5000 times of bending. Therefore,the super capacitor has a broad application prospect in flexible and wearable electronic devices and other fields.

Description

technical field [0001] The invention relates to the technical field of flexible energy storage devices, in particular to a flexible and tailorable solid-state supercapacitor and a preparation method thereof. Background technique [0002] Flexible wearable and portable electronics have attracted great attention in the past decades, and have promising applications in flexible displays, portable sensors, detectors, etc. In order to meet the energy requirements of the above-mentioned flexible electronic devices, it is urgent to develop matching high-performance flexible energy devices. To this end, scientists have developed flexible and wearable energy conversion and storage devices such as solar cells, ion secondary batteries, and supercapacitors. Supercapacitors (also known as electrochemical capacitors or supercapacitors) have attracted much attention due to their high power density, long stability (over 106 charge-discharge cycles), fast charging characteristics, and ease o...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the flexible all-solid-state supercapacitors that have been reported use polyvinyl alcohol gel electrolytes, and the specific capacity of the obtained devices is heavily dependent on the electrode materials used, and the specific capacity varies greatly.

In addition, most of the reported all-solid-state supercapacitors based on polyvinyl alcohol electrolytes self-discharge quickly in a short time, thus, there is an urgent need to develop novel polyelectrolytes for high-performance flexible supercapacitors with slow self-discharge performance.

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