文献类型：期刊文献

英文题名：A novel mesoporous carbon pocket with single atom Cr sites for high performance Lithium-Sulfur battery

作者：Li, Zhenwen[1];Li, Peng[2,3];Huang, Zheng[1];Wang, Dong[2,3];Ma, Dongshen[1];Zheng, Liyu[1];Lu, Shaojie[1];Yue, Qin[1]

机构：[1]Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Peoples R China;[2]East China Univ Sci & Technol, Ctr Computat Chem, State key Lab green Chem Engn & Ind Catalysis, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：496

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20243016755809);WOS:【SCI-EXPANDED(收录号:WOS:001278737700001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2021YFB3501900) , National Natural Science Foundation of China (22273021) , National Youth Topnotch Talent Support Program of China, and Shanghai Science and Technology Development Funds (22QA1402900) .r notch Talent Support Program of China, and Shanghai Science and Technology Development Funds (22QA1402900) .

语种：英文

外文关键词：Carbon - Decay (organic) - Doping (additives) - Lithium batteries - Lithium compounds - Lithium sulfur batteries - Mesoporous materials - Micelles - Morphology - Reaction kinetics

摘要：Lithium-sulfur batteries (LSBs) are considered one of the most promising next-generation energy storage devices. However, their practical application is limited by the sluggish conversion kinetics and shuttle behavior of lithium polysulfides (LiPSs). In this work, we employ a facile salt template and micelle-mediated co-assembly ordered mesoporous caged morphology with a high surface area (843.5 m2/g), large pore volume (0.184 cm3 g- 1), and uniform mesopore size (3.7 nm). The mesoporous structure offers a facilitated pump to promote electron/ion transportation while exposing more catalytic sites. These advantages enable the Cr-mNC pocket modified membrane to facilitate Li+ diffusion, enhance LiPSs adsorption, and accelerate electrochemical reaction kinetics for polysulfide conversion. Consequently, LSBs with Cr-mNC modified separator show a high sulfur utilization (1405 mAh g-1 at 0.2 C), a remarkable rate performance (776 mAh g- 1 at 5 C), a low capacity decay rate of 0.047 % per cycle at 2 C over 1000 cycles, and even remain at 4.47 mAh cm- 2 after 100 cycles with a high sulfur load of 5.0 mg cm- 2.