Electrocatalytic and stoichiometric reactivity of 2D layered siloxene for high-energy-dense lithium-sulfur batteries

作     者：Hui-Ju Kang Jae-Woo Park Hyun Jin Hwang Heejin Kim Kwang-Suk Jang Xiulei Ji Hae Jin Kim Won Bin Im Young-Si Jun 

作者机构：Department of Advanced Chemicals&EngineeringChonnam National UniversityGwangjuRepublic of Korea Division of Analytical ScienceKorea Basic Science Institute(KBSI)DaejeonRepublic of Korea Department of Applied ChemistryHanyang UniversityAnsanGyeonggi-doRepublic of Korea Department of ChemistryOregon State UniversityCorvallisOregonUSA Division of Materials Science and EngineeringHanyang UniversitySeoulRepublic of Korea 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2021年第3卷第6期

页      面：976-990页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the R&D Convergence Program of NST(National Research Council of Science&Technology)of the Republic of Korea(CAP-15-02-KBSI) a National Research Foundation of Korea(NRF)grant funded by the Korean Government(MSIT)(no.2019R1C1C1007745) a National Research Foundation of Korea(NRF)grant funded by the Korean Government(Ministry of Science,ICT&Future Planning)(no.2019R1A4A2001527) 

主　　题：2D confinement effects Lewis acid-base interactions lithium-sulfur batteries siloxenes thiosulfate-polythionate redox couple 

摘      要：Lithium-sulfur batteries(LSBs)have emerged as promising power sources for high-performance devices such as electric ***,the poor energy density of LSBs owing to polysulfide shuttling and passivation has limited their further market *** mitigate this challenge,two-dimensional(2D)siloxene(2DSi),a Si-based analog of graphene,is utilized as an additive for sulfur *** 2DSi is fabricated on a large scale by simple solvent extraction of calcium disilicide to form a thin-layered structure of Si planes functionalized with vertically aligned hydroxyl groups in the *** stoichiometric reaction of 2DSi with polysulfides generates a thiosulfate redox mediator,secures the intercalation pathway,and reveals Lewis acidic sites within the siloxene *** 2DSi utilizes the corresponding in-situ-formed electrocatalyst,the 2D confinement effect of the layered structure,and the surface affinity based on Lewis acid-base interaction to improve the energy density of 2DSi-based LSB *** with the commercial carbon-based current collector,2DSi-based LSB cells achieve a volumetric energy density of 612 Wh Lcell^(−1) at 1 mA cm^(−2) with minor degradation of 0.17%per cycle,which rivals those of state-of-the-art *** study presents a method for the industrial production of high-energy-dense LSBs.