文献类型：期刊文献

英文题名：Dual-Stage Polyporate Framework with Redox Mediator for High Loading Lithium Sulfur Batteries

作者：Zhang, Yifan[1]; Wang, Wenqiang[1]; Jia, Zhichao[1]; Ding, Jianlong[1]; Hua, Lan[1]; Sun, Ming[1]; Li, Yilin[1]; Wang, Gengchao[1]; Li, Chunzhong[2]

机构：[1] Shanghai Engineering Research Center of Hierarchical Nanomaterials, Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230454434)

语种：英文

外文关键词：Deposition - Electrodes - Lithium batteries - Lithium compounds - Lithium sulfur batteries - Loading - Reaction kinetics

摘要：Realizing a high sulfur loading cathode is a necessary measure for assembling a high actual energy density lithium sulfur battery, which requires consideration of conductivity, reaction interface, confinement of lithium polysulfide, and redox kinetics. Herein, a pomegranate-inspired dual-stage porous graphene foam with large cavity skeletons and submicron small cavity carriers is obtained by combining the bubble-template and the flash-freezing ice-template. Furthermore, the redox mediator of poly (1-aminoanthraquinone) is electropolymerized onto it to obtain a sulfur host with high specific surface area and strong confinement capability. The nanosized sulfur deposition kinetics and the rich electronic relay capability of the sulfur host are analyzed by the independent gradient model combined with in-situ Raman spectroscopy. Besides, a few of electro-depolymerization products of poly (1-aminoanthraquinone) are confirmed to be able to migrate to the anode surface to stabilize lithium deposition. With these merits, the assembled lithium sulfur batteries exhibit a discharge capacity of 1214 mAh g-1 and a high capacity retention rate of 75.1% after 800 cycles at a sulfur loading of 10.0 mg cm-2, and provide an excellent areal capacity of 17.5 mAh cm-2 (867 mAh g-1) even at an ultra-high sulfur loading of 20.1 mg cm-2. ? 2023, The Authors. All rights reserved.