Superior polysulfide adsorption ability by using Ti₃C₂ nanosheets as effective reservoirs for high electrochemical performance

Abstract

BACKGROUND A large amount of research has improved electrochemical performance by strengthening the chemical affinity by using polar materials in lithium–sulfur batteries. However, only some of this research has focused on the relationship between structure and polysulfide adsorption ability. RESULTS In this work, a Ti3C2 nanosheet structure has been applied as sulfur host matrix to improve electrochemical performance. Due to the nanosheet structure, the polysulfide was able to diffuse between the Ti3C2 layers, therefore improving the catalytic effect of the polysulfide. Moreover, the space between the Ti3C2 layers can store the soluble polysulfide as an effective reservoir. As a result, the traditional shuttle effect of the polysulfide could be efficiently inhibited. CONCLUSION Therefore, the as‐prepared Ti3C2/S composites exhibited high specific capacity, high rate performance, and stable cycle performance. All these superior electrochemical performances are attributed to the presence of the Ti3C2 nanosheet. © 2022 Society of Chemical Industry (SCI).