文献类型：期刊文献

英文题名：2,6-dimethoxy anthraquinone as redox mediator for the reversible deposition-dissolution of Li2S in lithium-sulfur batteries

作者：Gao, Ruili Ji, Shan Wang, Kunpeng Linkov, Vladimir Ma, Xianguo Wang, Hui

第一作者：Gao, Ruili

通信作者：Wang, H[1];Ji, S[2];Ma, XG[3]

机构：[1]Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China;[2]Jiaxing Univ, Coll Biol Chem Sci & Engn, Jiaxing 314001, Peoples R China;[3]Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China;[4]Univ Western Cape, South African Inst Adv Mat Chem, ZA-7535 Cape Town, South Africa;[5]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China

第一机构：Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Peoples R China

通信机构：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;corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2024

卷号：484

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;Scopus(收录号：2-s2.0-85185495111);WOS:【SCI-EXPANDED(收录号:WOS:001186898100001)】；

基金：The authors would like to thank the National Natural Science Foundation of China (51963004) , the Natural Science Foundation of Shandong Province of China (ZR2020MB024) and the Open Project Program of Guangdong Provincial Key Laboratory for Electronic Functional Materials and Devices, Huizhou University (No. EFMD2021001Z) for financially supporting this work.

语种：英文

外文关键词：Lithium-sulfur battery; Redox mediator; 26-Dimethoxy anthraquinone; Kinetics of redox reaction; Cyclic stability

摘要：The deposition and dissolution of Li2S are critical processes for the operation of high energy density lithiumsulfur (Li -S) batteries. In this study, 2,6-dimethoxy anthraquinone (DMAQ) is immobilized on the surface of carbon material (XC-72), to control the three-dimensional deposition of Li2S and reduce the energy barrier for the dissolution of Li2S. According to the density functional theory, DMAQ-Li2Sx has a higher HOMO and a lower LUMO energy, resulting in the promotion of the Li2Sx redox process. Furthermore, DMAQ-Li2Sx can reversibly dissociate and recombine under the influence of relatively moderate interaction forces, causing higher lithium polysulfide conversion. The obtained S@DMAQ/C cathode exhibits notable electrocatalytic performance in Li -S cells and good cycling stability at 1 C over 600 cycles, with the capacity retention rate as high as 77.3 % and a capacity decay rate of only 0.038 % per cycle.