文献类型：期刊文献

英文题名：Bifunctional Mo2C-N Sites on a Mo2C-GO-NC Interlayer for High-Performance Lithium-Sulfur Batteries: Suppressing the Shuttle Effect and Enhancing Kinetics

作者：Ma, Yongping[1];Xu, Aihao[1,4];Yu, Xiaolei[3];Liu, Fan[1];Zhang, Yankai[1];Wang, Jitong[1,2,3]

机构：[1]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China;[2]Guangxi Univ, Univ Engn Res Ctr Green Chem New Mat, Sch Chem & Chem Engn, Nanning 530004, Guangxi, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[4]Peoples Hosp Guangxi Zhuang Autonomous Reg, Guangxi Acad Med Sci, Nanning 530021, Peoples R China

年份：2025

卷号：8

期号：33

起止页码：16374

外文期刊名：ACS APPLIED NANO MATERIALS

收录：;EI(收录号：20253519064839);WOS:【SCI-EXPANDED(收录号:WOS:001547355800001)】；

基金：This work is financially supported by the National Natural Science Foundation of China (No. 22178116) and the Natural Science Foundation of Shanghai (No. 22ZR1417400).

语种：英文

外文关键词：lithium-sulfur batteries; interlayer; bifunctional binding sites; transition metal molybdenum; nitrogen-doping; lithium-polysulfide conversion

摘要：The commercialization of lithium-sulfur (Li-S) batteries faces significant challenges due to the shuttle effect of lithium polysulfides and sluggish reaction kinetics. To address these issues, a Mo2C-GO-NC interlayer, decorated with bifunctional Mo2C-N binding sites, is successfully synthesized via a facile one-step complexation method. The combination of transition metal molybdenum and nitrogen doping endows the reduced graphene oxide with a unique porous structure, strong chemisorption capabilities, and exceptional catalytic conversion properties. The Mo2C-GO-NC interlayer effectively traps lithium polysulfides and accelerates their conversion, as confirmed by theoretical calculations and in situ Raman spectroscopy. These studies reveal that the bifunctional Mo2C-N sites promote uniform Li2S deposition and enhance Li+ migration, significantly improving the reaction kinetics. As a result, the Li-S cells assembled by the Mo2C-GO-NC-modified separator exhibit a high initial capacity of 906.1 mAh g-1 at 1 C with a capacity decay rate of only 0.032% per cycle. In addition, a discharge capacity of 832.2 mAh g-1 was still exhibited after 110 cycles at a high sulfur loading of 5 mg cm-2. This work offers a strategic approach for designing advanced interlayers with bifunctional binding sites, paving the way for high-performance Li-S batteries.