Dr. James Tour of Rice University makes news regularly with different ways of making better batteries. His latest, a thin-film coating of carbon nanotubes, will enable lithium metal batteries to potentially achieve their full potential. According to the Tour Laboratory, that potential is worth considering. “Lithium metal charges much faster and holds about 10 times more energy by volume than the lithium-ion electrodes found in just about every electronic device, including cellphones and electric cars.” This promise is offset by problems with dendrite growth, the intrusion of tooth-like projections from the surface of the anode metal. If these growths expand far enough, they poke through the battery’s electrolyte and severely limit battery life. Worst of all, if the dendrites reach the cathode, they short out the battery, and possibly cause thermal runaway and fires. Tour and his student researchers have found that coating the lithium metal electrodes with a thin layer of carbon nanotubes keeps dendrites under control, and allows …