Revealing interfacial failure mechanism of silicon based all solid state batteries via cryogenic electron microscopy.

Summary: Solid-state batteries are like a super-safe power source for the future. But sometimes they stop working. Scientists used to think the main problem was a "roadblock" (called impedance) where the battery parts touch. But by using a super-cold microscope, they looked closely at batteries made with silicon. Surprise! The roadblock isn't the main issue after all. This discovery changes how we might fix and build these batteries in the future.