文献类型：期刊文献

英文题名：Alleviating the self-discharge and enhancing the polysulphides conversion kinetics with LaCO3OH nanocrystals decorated hierarchical porous carbon

作者：Lin, Yuhang[1];Tang, Weiqiang[1];Wu, Siyu[1];Zhang, Yongzheng[1];Kong, Zhenkai[1];Shen, Chunyin[1];Wang, Yanli[1];Zhan, Liang[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：452

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20223812778368);WOS:【SCI-EXPANDED(收录号:WOS:000862875800005)】；

基金：Y. L., W. T. and S. W. contributed equally to this work. This work was financially supported by China Postdoctoral Science Foundation (No. 2021M691008) , National Natural Science Foundation of China (No.22075081, 51472086, 51002051, U1710252, 20806024, 50730003, 50672025 and 22108070) .

语种：英文

外文关键词：Self -discharge; Electrocatalysis; Lithium -sulfur batteries; Carbon nanosheet arrays; Lanthanide metals

摘要：Lithium-sulfur (Li-S) batteries have been recognized as one of the most promising energy storage devices due to their ultrahigh energy density of 2600 Wh kg-1. However, their practical implementation is greatly impeded by the sluggish sulfur conversion kinetics, detrimental "shuttle effect" and severe self-discharge. In this work, LaCO3OH nanocrystals decorated nitrogen-doped carbon nanosheet arrays (MNCS-La) are fabricated via an etching-embedding method, which is further applied as an advanced sulfur reservoir for Li-S batteries. The hi-erarchical porous architecture of carbon nanosheet arrays provides a huge pore volume, which not only buffers the volume fluctuation of active materials during the discharge-charge process, but also facilitates the electrolyte infiltration and ion diffusion. More importantly, the monodispersed LaCO3OH nanocrystals inhibit the shuttle effect and self-discharge by forming a strong La-S bond with lithium polysulfides (LiPSs) and simultaneously enhance the electrochemical conversion kinetics. Attributed to these synergistic features, the sulfur electrodes based on MNCS-La achieve enhanced electrochemical performance, such as an initial discharge capacity of 1230 mAh/g at 0.2 C and a low capacity attenuation of 0.048% per cycle after 1000 cycles at 1 C. This work provides a feasible structural design of host for the applications of Li-S batteries and calls more attention to lanthanide metals-based composite materials.