Co-N X /Zn-N X Dual Active Sites Synergistically Promote Polysulfides Redox Kinetics for Lithium-Sulfur Batteries

Transition metal-nitride coordination site (TM-N x ) is considered as a promising catalyst due to its high catalytic activity in lithium-sulfur (Li-S) batteries. Herein, a novel dual active center electrocatalyst with evenly dispersed Zn-N x /Co-N x embed within mesoporous carbon ( Co-Zn@NC ) has been constructed. The resulting electronic transfer between Zn-N x and Co-N x induces the electron redistribution. Furthermore, the strong interfacial electronic interactions of binary sites exhibit excellent activity towards the lithium polysulfides (LiPSs) conversion. The Li-S batteries accordingly show greatly improved cycle stability and rate capacity. Even at high sulfur loading mass of 5.4 mg cm -2 , a reversible capacity of 4.1 mAh cm -2 can still be obtained at 0.1 C over 100 cycles.