Thin-film supercapacitor stack delivers 200 volts from just 3.8 cm³ without using metal parts or traditional separators

https://www.eurekalert.org/news-releases/1092126

"CO₂ laser transforms polyimide paper sheets into 3D graphene acting as: energy-storing electrode, electrical connector, structural support... scan density, power, speed optimized for graphene sheets with low electrical resistance/ strong electrochemical properties... hydrogel electrolyte doubles as separator... stacked tightly without metal current collectors/ external connectors... improved energy density/ voltage range... power: wearable sensors, flexible electronics, suitable for harsh/ space-limited conditions"