We've seen some very sophisticated 3D-printed objects recently, but never a tiny 3D-printed battery -- one that's as small as a grain of sand, no less.
A group of U.S. and Korean researchers has managed to print a lithium-ion microbattery that can fit on the head of a pin.
Although it weighs less than 100 micrograms, it can store as much power per gram as larger Li-ion batteries used in laptops or electric vehicles. It could even power tiny robots or medical devices. … Read more