Synergistic vanadium carbide/oxide heterostructures within layered carbon for enhanced lithium–sulfur battery performance

作者：Dong Mao, Yifan Fu, Junjie Ba, Junpeng Li, Xiuxiu Yin, Chunzhong Wang, Yingjin Wei, Yizhan Wang · 发表于：Journal of Colloid and Interface Science · 年份：2025 · DOI：10.1016/j.jcis.2025.137646 · 被引用次数：5 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Thermal Expansion and Ionic Conductivity

Lithium–sulfur (Li–S) batteries hold great promise due to their high theoretical energy density , but their practical application is impeded by the insulating nature of sulfur and the shuttle effect of soluble lithium polysulfides . Herein, we report the synthesis of vanadium carbide/oxide heterostructures embedded in a two-dimensional carbon matrix (VC/V 2 O 3 @C) through a facile topological transformation strategy to address these challenges. The synergistic heterostructure combines strong polysulfide adsorption capability with excellent redox activity. In situ Raman spectroscopy reveals that the VC/V 2 O 3 @C composite significantly accelerates polysulfide conversion and suppresses the shuttle effect. As a result, Li–S batteries utilizing VC/V 2 O 3 @C exhibit a high discharge specific capacity of 1281 mAh g −1 at 0.5 C and excellent cycling stability with a low capacity decay rate of 0.045 % per cycle (1200 cycles) at 1 C. Even under high sulfur loading and lean electrolyte conditions, impressive areal capacities are achieved. This work demonstrates a novel approach to enhancing Li–S battery performance through synergistic heterostructure design.