文献类型：期刊文献

英文题名：In situ construction of 3D 1T-VS2/V2C heterostructures for enhanced polysulfide trapping and catalytic conversion in lithium-sulfur batteries

作者：Li, Qi[1];Wang, Jun[1];Zhang, Yongzheng[1];Ma, Cheng[3];Wang, Jitong[1,2];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]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：681

起止页码：106

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20244817432481);WOS:【SCI-EXPANDED(收录号:WOS:001367768600001)】；

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 (No. 22ZR1417400) , the Fundamental Research Funds for the Central Universities (222201817001, 50321041918013, JKA01221601, and JKD01241701) .

语种：英文

外文关键词：1T-VS2; V2C; Heterostructures; Shuttle effect; Lithium-sulfur batteries

摘要：Lithium-sulfur (Li-S) batteries represent a promising next-generation energy storage solution, yet their performance is hindered by the insulating nature of sulfur and the detrimental shuttle effect. This study presents the insitu synthesis of metal-phase 1T-VS2 as a modified separator material on a two-dimensional Mxene substrate V2C (VSC). The synergistic effect of strong adsorption by V2C and highly conductive catalysis provided by 1T-VS2 significantly enhances the transport of ions and electrons between lithium polysulfide and the interface. The combinations of experimental data and density functional theory (DFT) indicate that 1T-VS2, which is characterized by its high density of defective active sites and high conductivity, not only effectively improves the adsorption of lithium polysulfides, but also dramatically lowers the redox energy barrier of Li2S, thereby accelerating the chemical reaction kinetics. As a result, the Li-S cells assembled by the VSC-modified separator exhibit an impressive initial capacity of 1131 mAh/g at 1 C with a capacity decay rate of only 0.05% per cycle. In addition, even after 100 cycles and at a high sulfur loading of 5.6 mg cm- 2 , the cells maintain a discharge capacity of 817 mAh/g. Impressively, the VSC continues to deliver excellent cycling and rate performance even when the environmental temperature is reduced to 0 degrees C. These findings offer valuable insights into the potential for the advancement of highly practical Li-S batteries.