A new paper presents a stable lithium-metal battery design for the first time. Lithium-ion batteries have flaws that lithium-metal batteries could fix. This new battery adds a self-healing technology that will close cracks where dendrites form. Lithium-ion batteries are the backbone of most of today’s electronic devices, including electric vehicles. But for all of their game-changing benefits, the batteries still have an inherent flaw: dendrites. These thin, snaking, tree-like pieces of lithium form sharp points and end up piercing the battery, causing short circuits and other problems. This ultimately shortens the lifespan of lithium-ion batteries, and leaves major room for...