Catalytic conversion of polysulfides by atomic layer deposition derived titanium nitride for high‐performance lithium‐sulfur batteries

Lithium-Sulfur (Li-S) batteries as the next-generation battery system have an ultrahigh theoretical energy density. However, limited conversion of polysulfides in sulfur cathodes deteriorates performance Li-S batteries. In this study, we develop a novel titanium nitride (TiN) catalyst for via atomic layer deposition (ALD). The synthesized ALD-TiN shows controllable ultrafine particle size (<2 nm) and uniform distribution at nanoscale carbon matrix. Combined with electrochemical analysis multiple post-characterization techniques, demonstrates excellent catalytic effect to facilitate nucleation Li2S, which effectively suppresses dissolution shuttle polysulfides. as-prepared cathodes, assistance TiN catalyst, exhibit cycling high rate (4 C) deliver 200% higher discharge capacity than pristine Sulfur-pristine porous composite cathodes.