Ultrafine TiO₂ Confined in Porous-Nitrogen-Doped Carbon from Metal–Organic Frameworks for High-Performance Lithium Sulfur Batteries

Ultrafine TiO 2 confined in porous-nitrogen-doped carbon is synthesized from a single metal–organic framework precursor. As a novel interlayer for lithium–sulfur batteries, the TiO 2 @NC composite can act as both a high efficiency lithium polysulfide barrier to suppress the side reactions and an additional current collector to enhance the polysulfide redox reactions. The lithium–sulfur battery with a TiO 2 @NC interlayer delivers a high reversible capacity of 1460 mAh g –1 at 0.2 C and capacity retention of 71% even after 500 cycles with high rate capability.