Multifunctional SnO_(2) QDs/MXene Heterostructures as Laminar Interlayers for Improved Polysulfide Conversion and Lithium Plating Behavior  

作　　者：Shungui Deng Weiwei Sun Jiawei Tang Mohammad Jafarpour Frank Nüesch Jakob Heier Chuanfang Zhang 

机构地区：[1]College of Materials Science and Engineering,Sichuan University,Chengdu 610065,People’s Republic of China [2]Laboratory for Functional Polymers,Swiss Federal Laboratories for Materials Science and Technology(EMPA),Überlandstrasse 129,8600 Dübendorf,Switzerland [3]Institute of Materials Science and Engineering,Ecole Polytechnique Fédérale de Lausanne(EPFL),Station 12,1015 Lausanne,Switzerland [4]Key Laboratory of Quantum Materials and Devices of Ministry of Education,School of Physics,Southeast University,Nanjing 211189,People’s Republic of China [5]SEU‑FEI Nano‑Pico Center,Key Laboratory of MEMS of Ministry of Education,Southeast University,Nanjing 210096,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第11期156-169,共14页纳微快报（英文版）

基　　金：financial support from the Swiss National Science Foundation via the Southeast Asia–Europe Joint Funding Scheme 2020(Grant No.IZJFZ2_202476);funding from the National Natural Science Foundation of China(Grant Nos.22209118 and 00301054A1073);the Fundamental Research Funds for the Central Universities(Grant Nos.1082204112A26,20826044D3083,and 20822041G4080)。

摘　　要：Poor cycling stability in lithium–sulfur(Li–S)batteries necessitates advanced electrode/electrolyte design and innovative interlayer architectures.Heterogeneous catalysis has emerged as a promising approach,leveraging the adsorption and catalytic performance on lithium polysulfides(LiPSs)to inhibit LiPSs shuttling and improve redox kinetics.In this study,we report an ultrathin and laminar SnO_(2)@MXene heterostructure interlayer(SnO_(2)@MX),where SnO_(2) quantum dots(QDs)are uniformly distributed across the MXene layer.The combined structure of SnO_(2) QDs and MXene,along with the creation of numerous active boundary sites with coordination electron environments,plays a critical role in manipulating the catalytic kinetics of sulfur species.The Li–S cell with the SnO_(2)@MX-modified separator not only demonstrates superior electrochemical performance compared to cells with a bare separator but also induces homogeneous Li deposition during cycling.As a result,an areal capacity of 7.6 mAh cm^(-2) under a sulfur loading of 7.5 mg cm^(-2) and a high stability over 500 cycles are achieved.Our work demonstrates a feasible strategy of utilizing a laminar separator interlayer for advanced Li–S batteries awaiting commercialization and may shed light on the understanding of heterostructure catalysis with enhanced reaction kinetics.

关 键 词：Lithium-sulfur battery Heterogeneous catalysis Heterostructure Redox kinetics Lithium dendrites 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]