Bimetallic Sulfide Co9S8/N-C@MoS2 Dodecahedral Heterogeneous Nanocages for Boosted Li/K Storage

In this paper, bimetallic sulfide Co9S8/N-C@MoS2 dodecahedral heterogeneous nanocages (DHNCs) are designed and synthesized via pyrolysis and sulfidation. The Co9S8/N-C@MoS2 DHNCs with unique structure and composition display superior lithium storage performance (a reversible capacity of approximate 557 mA h g(-1) at 5 A g(-1) after 400 cycles) and potassium storage performance (a reversible capacity of about 100 mA h g(-1) at 1 A g(-1) after 100 cycles). The remarkable electrochemical properties are attributed to the synergistic effect of bimetallic sulfides and the special polyhedral hollow structure with the conductive N-doped mesoporous carbon. This method could be used to develop new types of electrode materials with a heterogeneous hollow nanocages structure, which could enhance structural stability and mass transport kinetics for lithium-ion batteries and potassium-ion batteries.