If you want a battery that charges in seconds rather than hours, you go for a supercapacitor. There are some catches to that, though: either you give up the long-lasting energy of a chemical battery (like the lithium pack in your phone) or have to resort to exotic storage tech to get a long lifespan. Drexel researchers think they have a better balance. They've developed electrodes based on a nanomaterial, MXene, that promise extremely quick charging times for chemical batteries. The near-2D design combines an oxide-metal 'sandwich' with hydrogel to create a structure that's extremely conductive, but still lets ions move freely as the battery builds up a charge. In the lab's design, you can charge MXene electrodes within "tens of milliseconds" -- you could top up a phone in seconds or an electric car in minutes.