Researchers have developed a new method for safely prolonging battery life by inserting a nano-coating of boron nitride (BN) to stabilize solid electrolytes in lithium metal batteries. The team focused on solid, ceramic electrolytes, which show promise in improving safety and energy density, compared with conventional, flammable electrolytes in Li-ion batteries. Rechargeable solid-state lithium batteries they are promising candidates for next-generation energy storage.