WSe2 Flakelets on N‐Doped Graphene for Accelerating Polysulfide Redox and Regulating Li Plating

作者：Peng Wang, Fanghan Sun, Shenglin L. Xiong, Zhengchunyu Zhang, Bin Duan, Chenghui Zhang, Jinkui Feng, Baojuan J. Xi · 发表于：Angewandte Chemie International Edition · 年份：2021 · DOI：10.1002/anie.202116048 · 被引用次数：105 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Advanced battery technologies research

Abstract The practical application of lithium–sulfur batteries is still limited by the lithium polysulfides (LiPSs) shuttling effect on the S cathode and uncontrollable Li‐dendrite growth on the Li anode. Herein, elaborately designed WSe 2 flakelets immobilized on N‐doped graphene (WSe 2 /NG) with abundant active sites are employed to be a dual‐functional host for satisfying both the S cathode and Li anode synchronously. On the S cathode, the WSe 2 /NG with a strong interaction towards LiPSs can act as a redox accelerator to promote the bidirectional conversion of LiPSs. On the Li anode, the WSe 2 /NG with excellent lithiophilic features can regulate the uniform Li plating/stripping to mitigate the growth of Li dendrite. Taking advantage of these merits, the assembled Li−S full batteries exhibit remarkable rate performance and stable cycling stability even at a higher sulfur loading of 10.5 mg cm −2 with a negative to positive electrode capacity (N/P) ratio of 1.4 : 1.