Flexible polyaniline-based composite membrane and preparation method therefor, and supercapacitor

Abstract

The invention discloses a preparation method for a flexible polyaniline-based composite membrane. The preparation method comprises the following steps of (1) performing in-situ polymerization of aniline in the presence of exfoliated graphite, cellulosic fibers and silver nitrate to obtain a mixture of a nano composite, wherein the mass ratio of silver nitrate to aniline is 0.05 to 0.5; and the mass ratio of the exfoliated graphite to aniline is 0.55 to 0.75; and (2) performing vacuum filtering on the mixture and then drying the mixture to obtain the flexible polyaniline-based composite membrane. The composite membrane prepared by the invention has ultra-high area capacitance, an extremely good cycle performance, enhanced rate capability and a simple preparation method, and is far better than the existing SC (supercapacitor); and therefore, the flexible polyaniline-based composite membrane has the potential application in wearable electronic devices.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a flexible polyaniline-based composite film, a preparation method thereof, and a super capacitor. Background technique [0002] Supercapacitors (SCs) are an important class of energy storage devices due to their faster charge-discharge rates, higher power density, longer cycle life and lower maintenance than rechargeable batteries. It has attracted extensive attention in the energy industry. [0003] When designing SCs, electrode materials play an important role in their performance. The main factors to consider when designing electrode materials for SCs are capacitance, power and energy density, cycle life and stability, rate capability, and fabrication cost. Polyaniline (PANI) is a promising conducting polymer that has been widely used due to its advantages such as faradaic pseudocapacitance, environmental stability, low cost, easy processability, and relatively good electr...

AI Technical Summary

Problems solved by technology

And the cost of carbon fiber paper is high, and its active material (ie PANI) has limited mass loading (~4mg / cm 2 ) makes this composite unsuitable for high energy and high power applications

That is, although a SC with a small electrode mass loading can have a large mass-specific capacitance, it has a low area-specific capacitance

3. Using cellulose fiber / carbon nanotube (carbon nanotube, CNT) film as a template for in-situ synthesis of PANI, the mass loading of PANI on the cellulose fiber / CNT film of this type of material is also limited (~1.3 mg / cm 2 ), which in turn cannot meet the high energy and high power demands in wearable electronics

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