World's First 3-D Printed Battery Is The Size Of A Grain Of Sand

A team of scientists have used a custom-made 3-D printer to create high-power microbatteries. Scientists at Harvard University and the University of Illinois at Urbana-Champaign have 3-D printed lithium-ion batteries as small as a grain of sand. The batteries could be used to power micro-electronics, such as medical implants and robots that mimic insects. To construct the batteries, the team--led by Harvard's Jennifer A. Lewis--had to develop specialized inks with the correct electrochemical pro...