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] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220281307)

语种：英文

外文关键词：Carbon - Doping (additives) - Electric discharges - Electrocatalysis - Electrolytes - Etching - Kinetics - Lithium batteries - Lithium compounds - Nanocrystals - Nanosheets - Polysulfides - Porous materials - Rare earth elements - Structural design - Sulfur compounds

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 kinetics, detrimental "shuttle effect" and reversible self-discharge. In this work, LaCO3OH nanocrystals decorated nitrogen-doped carbon nanosheet arrays (MNCS-La) are fabricated via an etching-embedding method as an advanced sulfur reservoir for Li-S batteries. The hierarchical 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-1 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 to the applications of Li-S batteries and calls more attention to lanthanide metals-based composite materials. ? 2022, The Authors. All rights reserved.