In-situ constructed three-dimensional MoS2–MoN heterostructure as the cathode of lithium–sulfur battery

Lithium–sulfur batteries are recognized as one of the most promising next-generation high-performance energy storage systems. However, obstacles like the irreversible capacity loss hinder its broad application. Herein, we fabricated an interconnected three-dimensional MoS2–MoN heterostructure (3D-MoS2–MoN) via a facile salt-template method, overcoming the intrinsic shortcomings such as poor conductivity and compact morphology of traditionally-synthesized transition metal sulfides (TMSs). Furthermore, excellent electrocatalysis ability and hierarchical pore structure effectively accelerate the sluggish lithium polysulfides conversions during cycling. As a result, 3D-MoS2–MoN showed a high initial specific capacity of 1466 mAh·g−1 and excellent high-rate capability up to 4 °C. A stable cycling performance with a sulfur loading of 2 mg·cm−2 was realized with a low decay rate of 0.069% per cycle. This work introduced a rational design route for the appliance of TMSs in the lithium-sulfur batteries.Graphic abstract