文献类型：期刊文献

英文题名：FeCo/Fe3C-cross-linked N-doped carbon via synergistic confinement and efficient catalyst to enable high-performance Li-S batteries

作者：Li, Minhui Wang, Hui Wang, Xuyun Ma, Xianguo Ren, Jianwei Wang, Rongfang

第一作者：Li, Minhui

机构：[1] State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China; [2] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [3] Department of Mechanical Engineering Science, University of Johannesburg, Cnr Kingsway and University Roads, Johannesburg, Auckland Park, 2092, South Africa

第一机构：State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

年份：2022

卷号：628

起止页码：54-63

外文期刊名：Journal of Colloid and Interface Science

收录：EI(收录号：20223112457290);Scopus(收录号：2-s2.0-85134887738)

语种：英文

外文关键词：Binary alloys - Carbon nanotubes - Cathodes - Cobalt alloys - Doping (additives) - Electrocatalysis - Electronic structure - Iron alloys - Lithium alloys - Lithium batteries - Lithium compounds - Nanoparticles - Polysulfides - Redox reactions - Stability

摘要：Lithium-sulfur batteries (LSB) with high specific energy capacity and low material costs promise to be the next generation of energy storage devices. However, their commercialization is holding back by the poor cycling stability and fast capacity fading resulting from the shuttle effect and slow redox reaction. In this work, the FeCo/Fe3C-CNC composite was prepared by anchoring FeCo/Fe3C nanoparticles onto the crosslinked N-doped Carbon (CNC). The results showed that the addition of Co element improved the electrochemical activity of Co-Fe alloy through tuning the electronic structure of Fe atoms. The carbon nanotubes (CNTs) grown around Co-Fe alloy and Fe3C nanoparticles exhibited a strong affinity to polysulfide species and superior catalytic capability as nano-reactors. The N-doping CNTs/carbon sheets (CS) facilitated the formation of Li2S compound by promoting the Li+ ions transport while hindering the polysulfide shuttle effect. Hence, the issues of slow redox reactions and loss of polysulfide species were effectively rectified. As a result, the composite cathode FeCo/Fe3C-CNC-based LSB delivered a good specific capacity of 1401 mAh g?1 at 0.1C, and a low apacity fading rate of 0.029% per cycle at 1C. Besides, the structural stability of the FeCo/Fe3C-CNC composite confirms its potential for the deployment in LSB applications. ? 2022 Elsevier Inc.