A multifunctional UiO-66@carbon interlayer as an efficacious suppressor of polysulfide shuttling for lithium–sulfur batteries
Shaoning Zheng, Xinnan Zhao, Guihua Liu, Feichao Wu, Jingde Li
Abstract
Abstract Restraining the shuttle effect in lithium–sulfur (Li–S) battery is crucial to realize its practical application. In this work, a UiO-66@carbon (UiO-66@CC) interlayer was developed for Li–S battery by growing a continuous UiO-66 film on carbon cloth. The continuous UiO-66 crystal layer contributes to provide sufficient adsorptive and catalytic sites for efficient adsorption and catalytic conversion towards polysulfides. Moreover, the hydrophilic property of UiO-66 material ensures the full infiltration of electrolyte and accelerates the transportation of lithium ions. Profiting from the above advantages of the proposed interlayer, the shuttle effect is effectively inhibited and a fast redox kinetic is also realized. Accordingly, the Li–S battery using UiO-66@CC delivers a specific capacity of 1228.9 mAh g −1 at 0.2 C with a nearly 100% capacity retention after 100 cycles, and the first specific capacity is 1033.1 mAh g −1 at 1.0 C with a decay rate of 0.07% over 600 cycles. Meanwhile, UiO-66@CC interlayer also has an excellent rate performance with a specific capacity of 535.9 mAh g −1 at 5.0 C and a high area capacity of 6.2 mAh cm −2 at increased sulfur loading (8.15 mg cm −2 ).