文献类型：期刊文献

英文题名：Synergistic Effect between Monodisperse Fe3O4 Nanoparticles 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

通信作者：Wang, RF[1];Ji, S[2]

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

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

通信机构：corresponding author), Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Shandong, Peoples R China;corresponding author), Jiaxing Univ, Coll Biol Chem Sci & Engn, Jiaxing 314001, Peoples R China.

年份：2022

卷号：14

期号：14

起止页码：16310-16319

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000800533100040)】；

基金：The authors would like to thank Key Technology Research and Development Program of Shandong Province of China (no. 2019GGX103029) and the Natural Science Foundation of Shandong Province of China (no. ZR2020MB024) for financially supporting this work.

语种：英文

外文关键词：nano-Fe3O4 nanoparticles; N-doped carbon; synergistic effect; cathode; lithium-sulfur battery

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 Fe3O4 nanospheres 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(-1) at 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.