Ultralong cycle life enabled by in situ growth of CoMo1-xP/Mo heterostructure for lithium-sulfur batteries

Lithium-sulfur batteries (Li-S batteries) are considered as promising new-generation electrochemical energy storage devices due to their extremely high theoretical energy density (2600 Wh kg(-1)) and theoretical specific capacity (1675 mAh g(-1)). However, numerous problems such as poor conductivity and the shuttle effect during discharge-charge process limit the practical application of lithium-sulfur batteries. In this work, porous tubular CoMo1-xP/Mo constructed by in situ growth of metal Mo was designed as the sulfur host for lithium-sulfur batteries. The introduction of Mo modulated the electronic structure of CoMoP to improve the conductivity of cathode and facilitate the redox kinetics, as well as the CoMo1-xP/ Mo heterostructure was beneficial to inhibit the shuttle effect through the interaction with lithium poly sulfides, which improved cycling stability. As a result, CoMo1-xP/Mo/S cathode had a low-capacity decay rate of only 0.029% per cycle after 2000 cycles at 0.5 C. This work provided a new perspective for the further design of high-performance lithium-sulfur battery cathode materials.

Automated summary

By introducing metal molybdenum and designing a porous tubular structure of CoMo1-xP/Mo sulfur host, the conductivity and cycling stability of lithium-sulfur batteries can be improved, and the shuttle effect can be effectively inhibited, providing a new approach for the further design of high-performance cathode materials for lithium-sulfur batteries.