Researchers from the UCLA developed a new graphene-based material that can significantly enhance the energy density of supercapacitors - in fact making them as good as lead acid batteries.

They call the new material holey graphene framework. It is a 3D material that has tiny holes in it. The holey graphene features superior electrical conductivity, exceptional mechanical flexibility and unique hierarchical porosity. This enabled the researchers to create a capacitor that has an unparalleled energy densities of 35 watt hours per kilogram (49 watt hours per liter), which is up to 10 times higher than current commercial supercapacitors.