2026/02/11 by Guifen Wu, Yunmiao Fan, Jiatong Li +4 · 1 voice
Engineering · Materials Science · #2D Materials and Applications #Advanced Battery Materials and Technologies #Advancements in Battery Materials
paper · pdf · doi:10.1007/s40820-026-02100-3
openalex created_date 2026/02/11 · openalex publication_date 2026/02/11 · openalex updated_date 2026/07/29
Abstract The shuttle effect of lithium polysulfides (LiPSs) and sluggish redox kinetics severely restrict the development of high-energy lithium–sulfur (Li–S) batteries. To alleviate this issue, this study adopts an in situ design strategy to construct tungsten carbide (WC) nanocrystals on the surface of two-dimensional (2D) tungsten boride (WB)-based MBene, creatively forming a WB@WC heterostructure to optimize the adsorption–migration–catalysis mechanism of LiPSs. The WB–WC heterointerface reduces the reaction energy barrier of LiPSs due to the electron delocalization effect and promotes the deposition/dissociation of Li 2 S and the transfer of charge. In situ Raman verified that WB@WC can effectively inhibit LiPSs shuttling. In situ X-ray absorption fine structure spectroscopy (XAFS) characterizations further explored the dynamic change of W valence state during LiPSs redox cycle. Encouragingly, the WB@WC-modified Li–S cell delivers an initial capacity of 1277 mAh g −1 at 0.2 C. It exhibits extremely stable cycling performance at 2 C, with a low-capacity decay rate of only ~ 0.024% per cycle. Even under sulfur loading of 7.92 mg cm −2 , high capacity of 7.9 mAh cm −2 can still be achieved. This work provides an effective method for regulating the activity of MBene-based catalysts.