> They estimate that a 45 cubic meter sample of their supercapacitor could hold 10 kilowatt-hours of energy In other words, 0.22Wh/L or 0.09Wh/kg. For comparis

> They estimate that a 45 cubic meter sample of their supercapacitor could hold 10 kilowatt-hours of energy In other words, 0.22Wh/L or 0.09Wh/kg. For comparison, the lower end for li-ion batteries is 250Wh/L and 100Wh/kg. Cute trick, but considering the carbon emissions inherent in concrete production this seems like a horrible idea - even if they manage to make them two or three orders of magnitude better. It might be usable if you can essentially turn buildings into capacitors with zero additional change required, but as soon as it even remotely impacts the construction process it essentially instantly becomes nonviable.