Promoting Electrochemical Kinetics Of Li-S Batteries With C@Sns2 Modified Separator Via Synergic Effect Between Porous Carbon Matrix And Polar Sns2

Lithium-sulfur (Li-S) batteries are recognized as one of the most promising energy storage technologies. However, the "shuttle effect" of polysulfides and poor reaction kinetics severely impede the commercial application. In this study, a three-dimensional (3D) multi-functional C@SnS2 compound material is designed for PP separator modification. Chemical etching is skillfully used to construct evenly distributed vacancies and activated carbon sites from ZIF-67 in one step, which is beneficial to the uniform growth of SnS2 subsequently. The C@SnS2 shows a synergic effect between porous carbon matrix and polar SnS2 due to the unique structure, combining electrochemical kinetics and anchoring-catalytic-conversion of polysulfides. Therefore, excellent long-term cycling performance (646 mAh g(-1) after 500 cycles at 1 C, the loss rate of 0.062% per cycle) and outstanding rate capacity (793 mAh g(-1) at 2 C) are obtained. This work provides an effective attempt to inhibit the shuttle effect and improve the kinetic process in Li-S batteries. (C) 2021 Elsevier Ltd. All rights reserved.