A study led by John Heinzel from the US Naval Surface Warfare Center in Philadelphia, along with researchers at the University of Texas at Arlington, has compared the performance of supercapacitors from four different manufacturers: Maxwell, Ioxus, JM Energy, and Skeleton. Of the four tested, only the Skeleton supercapacitors are graphene-enhanced.
The team studied cells from the four different manufacturers under high pulsed load conditions to measure their power density into low-impedance loads. The researchers found that the Skeleton cell far outperformed the other cells tested, and graphene was mentioned as the probable cause for this efficiency.
The researchers commented: "Its [the Skeleton cell] ESR was less than half of any of the other cells tested, and its power density is more than 10-kW/kg higher than the others. As for the JM Energy cell, it was the least power dense and had the highest ESR of the four cells tested. This was as expected due to its properties as an LIC, though it is more energy dense than the other three cells as well.
Skeleton’s superior results are likely due to their use of curved graphene instead of the activated carbon that the other manufacturers use. This advancement in the energy storage technology will allow for the construction of energy systems that can supply more power to transient loads and allow for the reduction in the size of existing systems. It also allows for more efficient energy storage systems due to the cell’s low ESR. Future testing will include repetitive pulsing that will be used to compare the amount of energy lost as heat for each cell due to their ESR".
Earlier this month, Skeleton Technologies stated its plan to invest €25 million in its plant located in the German state of Saxony. With this investment, Skeleton aims to expand its research and development as well as scale its production.