'Unbreakable Battery': Flexible, Cuttable Lithium-Ion Battery Won't Catch Fire

Current lithium-ion batteries are susceptible to fire and explosive incidents because they are built with flammable and combustible materials. Johns Hopkins University researchers have designed a flexible, fireproof lithium-ion battery built to operate under extreme conditions, including cutting, submersion in water, and simulated ballistic impact. The key to the new battery design is the discovery of a new class of "water-in-salt" and "water-in-bisalt" electrolytes that, when incorporated in a polymer matrix, rid the battery of flammable and reactive solvents.