文献类型：期刊文献

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

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

第一作者：Liang, Yangjie

通信作者：Ma, XG[1];Wang, H[2];Ji, S[3]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;[2]Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China;[3]Jiaxing Univ, Coll Biol Chem Sci & Engn, Jiaxing 314001, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;corresponding author), Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China;corresponding author), Jiaxing Univ, Coll Biol Chem Sci & Engn, Jiaxing 314001, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2025

卷号：139

外文期刊名：JOURNAL OF ENERGY STORAGE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001598910300001)】；

基金：The authors would like to thank the Natural Science Foundation of Gui zhou Province (Grants No. QKHJC-ZK [2023] Key 019, Grants No. QKHJC-ZD [2025] 038) for financially supporting this work.

语种：英文

外文关键词：Chlorinated p-benzoquinone; Cathode deposit layer; Sulfur conversion; Lithium-sulfur battery

摘要：The "shuttle effect," slow sulfur redox kinetics, and low utilization of active materials have become challenges that lithium-sulfur (Li-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-O bonds and C-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.