Facile one-pot synthesis of Co3Mo3N-loaded inside hierarchical porous bead-on-string as cathode host material for high-performance lithium-sulfur batteries

作者：Bin Yue, Ningyuan Zhang, Yuqi Wang, Yunrui Xie, Wensheng Yu, Qianli Ma, Jinxian Wang, Guixia Liu, Xiangting Dong · 发表于：Chemical Engineering Journal · 年份：2024 · DOI：10.1016/j.cej.2024.152987 · 被引用次数：23 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Ferroelectric and Piezoelectric Materials

A critical factor impeding the development of lithium-sulfur batteries is the deleterious shuttle effect. To address the issue, we devise a facile electrospinning approach to integrate catalysts and hierarchically porous structures into bead-on-string carbon host material as the host material. Compared to the traditional preparation of hierarchical porous structures, the upgraded electrospinning eliminates the need for etching templates, providing a larger specific surface area (333.39 m 2 g −1 ) and tremendous potential for large-scale production. The cathode utilizing bead-on-string Co 3 Mo 3 N as host material exhibits a remarkable capacity of 1257 mAh g −1 at 0.2 C and maintains a capacity retention rate of 90 % after 100 cycles. Even at 4.0 C, the capacity remains at 648 mAh g −1 with minimal capacity loss. Under harsh conditions (including high sulfur loading, high areal loading, and lean electrolyte), the composite cathode consistently delivers a capacity of 8 mAh cm −2 . Simultaneously, systematic electrochemical testing, in-situ assessments, and DFT calculations unveil the dual-metal synergistic effects of Co 3 Mo 3 N in suppressing the shuttle effect and catalyzing the conversion of lithium polysulfides. Co 3 Mo 3 N provides chemical adsorption to significantly promote the reaction kinetics of polysulfides. This work establishes a neoteric technique and a theoretical strategy for exploring the catalytic efficacy of dual-metal nitrides for Li-S batteries.