MoO2/ZnS 复合材料改性隔膜实现锂硫电池稳定的高倍率性能.

Lithium-sulfur batteries are considered as one of the most promising next-generation rechargeable batteries due to their high energy density and cost-effectiveness. However, the shuttle effect of polysulfides significantly decreases the cycle life and stability of Li-S batteries, hindering their practical applications. The separator modified by inorganic metal compound materials can not only inhibit the shuttle effect of polysulfides, some of its special crystal planes can also accelerate the redox reaction kinetics of polysulfides. In this paper, the MoO2/ZnS nanocomposites were synthesized by growing spherical MoO2 on the surface of compass-shaped ZnS. MoO2 possesses strong adsorption effect towards polysulfides and ZnS exhibits excellent electronic conductivity, accelerating the electron conduction efficiency and redox rate. The cell with MoO2/ZnS separator exhibits a high specific capacity of 690 mAh g-1. At a high current density of 5 C, the discharge specific capacity can still be maintained after 1 000 cycles, with an average capacity decay rate of 0.014%, showing excellent cyclic stability and rate performance. [ABSTRACT FROM AUTHOR]