▎ 摘　　要

Lithium-sulfur batteries are widely concerned because of their high energy density. However, its application is limited by the shuttle effect of polysulfides. In this work, the reduced graphene oxide/carbon black co-modified separator is fabricated using the vacuum filtration method. The initial discharge specific capacity of lithium-sulfur battery with reduced graphene oxide/carbon black (1:1) separator reaches 1014.5 mAh g(-1) at 0.2 C and the capacity decay rate is only 0.17% per cycle, which shows excellent cycling stability. Furthermore, the capacity retention ratio is 75.47% at 1 C after 500 cycles. Particularly, it shows outstanding performance at high current density, and the specific capacity keeps at 612.2 mAh g(-1) even at 5 C. The excellent electrochemical performance can be attributed to the physical adsorption of abundant pores and the chemical adsorption of hydroxyl functional group, providing strong capability for trap polysulfides. The co-modified separator not only serves as trapper to inhibit the shuttle effect of polysulfides, but also acts as upper current collector for the reuse of captured polysulfides. This simple and controllable preparation method can be applied in the design of long-cycle life and high power density of lithium-sulfur batteries.