文献类型：期刊文献

英文题名：Lewis Acid-Optimized Hydrolysable Catalytic Binder with Dynamic Hydrogen-Bonded Framework for Durable Lithium-Sulfur Batteries

作者：Chen, Houyang[1,2]; Zhou, Feixiang[1,3]; Mei, Yuhan[1,2]; Wu, Qingping[1,2]; Liu, Jingqiu[1,2]; Chen, Xi[1,2]; Li, Huan[1,2]; Xu, Jun[3]

机构：[1] Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; [2] Chongqing School, University of Chinese Academy of Sciences, Chongqing, 400714, China; [3] School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240480074)

语种：英文

外文关键词：Grafting (chemical) - Hydrogen bonds - Lithium sulfur batteries - Lithium-ion batteries - Photodissociation - Photoionization - Photolysis

摘要：The elaborate design of advanced multifunctional binders for lithium-sulfur (Li-S) batteries with robust mechanical, smooth Li ion/electron conduction, and restrictive polysulfides dissolution in addition to basic adhesion ability remains a challenge. Herein, we propose a hydrolyzable catalytic binder composed of carboxymethyl cellulose (CMC) as matrix and pyridine-3,5-dicarboxylic-cerium (Pdc-Ce) as improving agent through a hydrogen bond driven in-situ grafting preparation strategy, which suitable for tolerant Li-S batteries cathode. The dynamic intermolecular hydrogen bonding in this binder dissipates the stress energy caused by electrode particle volume changes during cycling, maintaining the electrochemical stability of Li-S batteries. The electron cloud distribution and spatial layout of lithiophilic sites (–OH and –COO–) optimized by Lewis acid sites (Pdc-Ce) endow the binder with an effective integrated function of fast Li+ migration and polysulfides adsorption/catalysis. The resulted Li-S batteries deliver ultrahigh initial discharge capacity of 1542.5 mAh g-1 at 0.5 C, excellent rate performance up to 20 C, and long cyclability over 600 cycles even at 5 C. Such a binder that combines excellent mechanical properties, chemical adsorption confinement, and accelerated kinetics of polysulfide conversion reactions has also inspired high-energy density pouch Li-S cell with high sulfur loading and lean electrolyte. ? 2024, The Authors. All rights reserved.