NPORE® is the world’s first flexible, nanoporous, freestanding ceramic separator for lithium-ion batteries. The absence of a polymeric membrane—the principal component of conventional separators—endows NPORE® with remarkable thermal stability and functionality. The advantages of this ceramic separator have been validated through discharge-rate and cycling tests in the presence of an ionic liquid-based electrolyte and battery developed by iElectrolyte that can withstand elevated temperatures. NPORE® presents an ideal separator solution for both typical and, when coupled with heat-resistant electrolytes, extraordinary application scenarios.