文献类型：期刊文献

英文题名：Synergistic Effect between Monodisperse Fe3O4Nanoparticles and Nitrogen-Doped Carbon Nanosheets to Promote Polysulfide Conversion in Lithium-Sulfur Batteries

作者：Li, Minhui Ji, Shan Ma, Xianguo Wang, Hui Wang, Xuyun Linkov, Vladimir Wang, Rongfang

第一作者：Li, Minhui

机构：[1] College of Chemical Engineering, Qingdao University of Science and Technology, Shandong, Qingdao, 266042, China; [2] College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, China; [3] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [4] South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town, 7535, South Africa

第一机构：College of Chemical Engineering, Qingdao University of Science and Technology, Shandong, Qingdao, 266042, China

通信机构：College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, China

年份：2022

卷号：14

期号：14

起止页码：16310-16319

外文期刊名：ACS Applied Materials and Interfaces

收录：EI(收录号：20221511961989);Scopus(收录号：2-s2.0-85127888636)

语种：英文

外文关键词：Carbon nanotubes - Nitrogen - Metals - Polysulfides - Doping (additives) - Lithium batteries - Magnetite - Lithium compounds - Electrocatalysts - Lithium sulfur batteries - Metal nanoparticles - Sulfur compounds

摘要：Effective fabrication of electrocatalysts active in anchoring and converting lithium polysulfides is critical for the manufacturing of high-performance lithium-sulfur batteries (LSBs). In this study, original Fe3O4nanospheres with diameters close to 12 nm were finely dispersed over a porous nitrogen-doped carbon matrix by the freeze-drying method to produce a three-dimensional composite material (nano-Fe3O4/PNC) suitable for application as a sulfur host in LSBs. Nano-Fe3O4/PNC loaded with sulfur (S@nano-Fe3O4/PNC) was used as a cathode in a Li-S cell, whose initial discharge specific capacity reached 1256 mA h g-1at a 0.1 C rate. After 100 charge-discharge cycles at a 0.2 C rate, the reversible capacity of S@nano-Fe3O4/PNC remained at 745 mA h g-1, demonstrating a capacity retention rate of 70%. Importantly, a high Coulombic efficiency of more than 99% was achieved, indicating effective inhibition of the polysulfides' "shuttle effect" by nano-Fe3O4/PNC. The use of electrolytes containing lithium nitrate further reduces the "shuttle effect" of polysulfides. This study demonstrates the synergistic effect between metal oxide nanoparticles and N-doped carbon, which plays an important role in promoting the adsorption and conversion of polysulfides in LSBs. ? 2022 American Chemical Society. All rights reserved.