'Spillway' for electrons could keep lithium metal batteries from catching fire 
San Diego CA (SPX) Mar 13, 2020
Nanoengineers at the University of California San Diego developed a safety feature that prevents lithium metal batteries from rapidly heating up and catching fire in case of an internal short circuit. The team made a clever tweak to the part of the battery called the separator, which serves as a barrier between the anode and cathode, so that it slows down the flow of energy (and thus heat) Source: NanoDaily.com https://www.energy-daily.com/reports/Spillway_for_electrons_could_keep_lithium_metal_batteries_from_catching_fire_999.html