▎ 摘　　要

Lithium-sulfur batteries have been widely studied because of their advantages of abundant reserves, environmental friendliness, low cost and high specific capacity. However, the volume expansion and the low electrical conductivity of sulfur, and the shuttle effect of polysulfides limit their application. Herein, we synthesize a two-dimensional layered Ni3Sn2/nitrogen-doped graphene (NG) composite as separator modifying material for lithium-sulfur batteries. The Ni3Sn2 formed by dual metal salts Ni (NO3)(2)center dot( )6H(2)O and SnCl2 center dot 2H(2)O can adsorb polysulfide and catalyze its transformation to improve the electrochemical reaction kinetics. Moreover, the layered NG can not only disperse the Ni3Sn2 particles, but also ensure rapid electron transfer. Therefore, the lithium-sulfur battery with the Ni3Sn2/NG modified separator shows excellent electrochemical performance. At a current rate of 1 C, the lithium-sulfur battery with the Ni3Sn2/NG modified separator can provide a high initial discharge capacity of 1022.1 mAh g-1 and maintain a reversible specific capacity of 758.3 mAh g-1 after 400 cycles.(c) 2022 Elsevier Inc. All rights reserved.