December 19, 2016
Building Better Batteries
Lithium-ion batteries, widely used in devices ranging from electric cars to iPhones, are composed of a cathode made from a positively charged lithium compound and an anode composed of negatively charged carbon. Ideally, anodes would be made of lithium metal, which can store more energy than carbon. However, lithium metal anodes have a serious flaw—over time, the lithium metal grows dendrites, tiny needle-like branching structures that can grow through the battery causing it to short-circuit or even explode.