文献类型：期刊文献

英文题名：Shortening sulfur redox pathway via coupled Li[sbnd]O and C[sbnd]S bonds in Li[sbnd]S batteries

作者：Liang, Yangjie Shao, Jiayi Ji, Shan Ma, Xianguo Wang, Xuyun Wang, Hui Wang, Rongfang

第一作者：Liang, Yangjie

机构：[1] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [2] College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China; [3] College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, China

第一机构：贵州理工学院化学工程学院

通信机构：College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, China

年份：2025

卷号：139

外文期刊名：Journal of Energy Storage

收录：EI(收录号：20254119310675);Scopus(收录号：2-s2.0-105018176503)

语种：英文

外文关键词：Additives - Decay (organic) - Efficiency - Electrolytes - Kinetics - Lithium batteries - Lithium compounds - Lithium sulfur batteries - Organic-inorganic materials - Polysulfides - Redox reactions - Sulfur - Sulfur compounds

摘要：The "shuttle effect," slow sulfur redox kinetics, and low utilization of active materials have become challenges that lithium?sulfur (Li[sbnd]S) batteries must currently address. To tackle these issues, this study employs 2-chloro-1,4-benzoquinone (MCBQ) as an electrolyte additive. MCBQ, with its carbonyl oxygen structure and halogen substituents, can react with polysulfides to form a cyclic insoluble organic sulfur intermediate that contains Li[sbnd]O bonds and C[sbnd]S bonds. During discharge, it alters the conversion pathway of sulfur species. Taking Li2S6 as an example, the original path "Li2S6 → Li2S4 → Li2S2 → Li2S" is optimized into a new pathway "MCBQ- Li2S6 → MCBQ-2Li2S3 → MCBQ-2Li2S" simplifying the route to enhance sulfur redox kinetic efficiency. Moreover, MCBQ also forms an organic-inorganic hybrid interfacial protective layer on the lithium anode side, effectively mitigating the corrosion of the lithium anode by polysulfides. The battery with the MCBQ additive maintains a Coulombic efficiency of 100 % at a current density of 0.2C, with an initial discharge capacity reaching 812 mAh g?1; even after 120 cycles, the capacity decay rate per cycle is only 0.42 %. The introduction of MCBQ not only accelerates sulfur redox kinetics but also enhances the utilization of active materials and overall battery stability. ? 2025 Elsevier Ltd