文献类型：期刊文献

英文题名：Synergistic Sulfur Immobilization and Bidirectional Catalysis Enabled by VS2-VO x /V2C Heterostructure for Robust Lithium-Sulfur Batteries

作者：Wang, Jun[1];Li, Qi[1];Zhang, Yongzheng[1];Ma, Cheng[4];Wang, Jitong[1,2,3];Qiao, Wenming[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China;[3]Green Chem New Mat Engn Res Ctr Guangxi Coll & Uni, Nanning 530004, Peoples R China;[4]East China Univ Sci & Technol, Minist Educ, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China

年份：2025

卷号：13

期号：39

起止页码：16521

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：;EI(收录号：20254219323644);WOS:【SCI-EXPANDED(收录号:WOS:001583962800001)】；

基金：This work is financially supported by the National Natural Science Foundation of China (Nos. U21A2060 and 22178116), the Natural Science Foundation of Shanghai (Grant 22ZR1417400), and the Fundamental Research Funds for the Central Universities (No. 222201817001, 50321041918013, JKA01221601, and JKD01241701).

语种：英文

外文关键词：V2C; Heterostructures; Shuttle effect; Bidirectional catalysis; Li-S batteries

摘要：Vanadium-based catalysts are considered an effective strategy to resolve the shuttle effect and sluggish solid-liquid-solid reaction kinetics in lithium-sulfur (Li-S) batteries, thanks to their strong adsorption and catalytic conversion capabilities toward polysulfides. Herein, a self-oxidation-driven solvothermal strategy was employed to construct a defect-rich homologous heterostructure of nanoflower-like VS2-VOx on a two-dimensional conductive V2C network (denoted as VSOC). The experimental results demonstrate that VSOC effectively enhances the multiphase redox reaction kinetics of sulfur species through the strong adsorption and spontaneous transformation of long-chain polysulfides by the highly conductive V2C and the accelerated catalytic reduction of insoluble short-chain Li2S by the V-S-O heterostructure. Consequently, the Li-S cells assembled with VSOC-modified separator and normal loaded 1.0 mg cm(-2) KB/S cathode deliver a high first discharge capacity of 1340 mAh g(-1) at 0.2 C with a low-capacity decay rate of 0.03% per cycle during long-term cycling at 1 C. It still achieves a capacity contribution of 501.3 mAh g(-1) even at 5 C. Moreover, under challenging conditions such as high sulfur loading (4.2 mg cm(-2)) and low temperature (0 degrees C), the VSOC-modified separator maintains 89% and 85% capacity retention and stable Coulombic efficiency. This study proposes a novel heterostructure design strategy for optimizing the performance of Li-S batteries.