Synthesis of porous N deficient graphitic carbon nitride and utilization in lithium-sulfur battery

Lithium-sulfur battery (LSB) is a very promising candidate in the next generation battery systems due to its high specific capacity (1675 mA h g(-1)) and low cost. Novel host materials, which are designated to suppress the dissolution of lithium polysulfides (LiPS) into electrolyte, play critical roles to solve the long-term cycling problem in LSB. Herein, the porous structured N deficient g-C3N4 (NDCN) material is developed to construct advanced cathode in LSB through a simple fabrication strategy. The obtained NDCN exhibits a unique 3D architecture with abundant macro-and meso-pores to host S and facilitate ion transport, while the abundant active sites provide strong adsorption towards LiPS. As a result of these above merits, LSB based on S@NDCN cathode delivers an excellent long-term cycling stability with a decay rate of 0.045% per cycle over 300 cycles at 1C.

Automated summary

The novel NDCN material with unique 3D architecture and abundant pores is developed for advanced cathode in LSB, providing strong adsorption towards LiPS. The LSB based on S@NDCN cathode demonstrates excellent long-term cycling stability with a low decay rate over 300 cycles at 1C.