This technology is a method for manufacturing supercapacitor films by alternately dip-coating positively charged polyaniline and negatively charged graphene oxide onto a substrate, followed by electrochemical reduction to create a graphene/conductive polymer multilayer film. Using a layer-by-layer deposition method based on electrostatic attraction, up to 1,000 bilayers can be stacked.
The amount of energy a supercapacitor can store depends heavily on the properties of the electrode polymer film, but conventional polymer films have lacked sufficient energy and power density. Even when combining graphene and conductive polymers, there have been limitations in achieving uniform and stable deposition to maximize storage performance.
This technology combines alternating polyaniline and graphene oxide coating—with controlled solution concentration and pH—with electrochemical reduction that requires no chemical reducing agents, resulting in a stable film with significantly higher energy and power density than conventional polymer films. It can be deposited on glass, silicon, metal, or plastic substrates regardless of size or shape, making it suitable for flexible electronics, wearable device power sources, and thin-film energy storage devices, allowing for the design of thin-film electrodes with desired capacities simply by adjusting the number of layers.
This invention was developed with support from the Ministry of Education, Science and Technology for research on the manufacturing and properties of self-assembled graphene nanocomposite films.
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