NREL’s extensive portfolio of battery-safety research includes high-speed X-ray imaging to show what happens during battery failure. Credit: Donal Finegan, NREL Tucked into your pocket, packed into warehouses, and embedded into critical infrastructure—lithium-ion batteries are quietly powering much of modern America. Demand for these indispensable energy storage solutions continues to skyrocket, prompting energy experts to explore next-generation (next-gen