A new flexible supercapacitor with a volumetric energy density of 6.3 microwatt hours per cubic millimeter is said to have the highest reported storage capacity by volume reported for carbon-based microscale supercapacitors. The device was created by a team of researchers from Nanyang Technological University, Tsinghua University and Case Western Reserve University.
The device is comprised of a tightly interconnected network of graphene and carbon nanotubes that stores energy similar to the storage capacity of thin-film lithium batteries. The device also charges and releases energy much quicker than batteries. The team has created fibers that are 50 meters long and see no length restrictions for applications that require the fiber to be scaled-up.