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 center dot g(-1) and excellent high-rate capability up to 4 degrees C. A stable cycling performance with a sulfur loading of 2 mg center dot 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

Automated summary

The 3D-MoS2-MoN heterostructure fabricated via a salt-template method shows excellent performance in lithium-sulfur batteries, overcoming the intrinsic shortcomings of traditional TMSs and possessing remarkable electrocatalysis ability and hierarchical pore structure.