Rationalizing the impact of oxygen vacancy on polysulfide conversion kinetics for highly efficient lithium-sulfur batteries

作     者：Ya Song Huan Li Junfeng Li Jinyu An Jiao-Jing Shao Guangmin Zhou Ya Song;Huan Li;Junfeng Li;Jinyu An;Jiao-Jing Shao;Guangmin Zhou

作者机构：School of Materials and MetallurgyGuizhou UniversityGuiyang 550025GuizhouChina School of Chemical Engineering and Advanced MaterialsThe University of AdelaideAdelaideSA 5005Australia Shenzhen Geim Graphene CenterTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina College of Civil EngineeringGuizhou UniversityGuiyang 550025GuizhouChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第87卷第12期

页      面：51-60,I0003页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by National Natural Science Foundation of China(Grant Nos.51972070 and 52062004) Guizhou Provincial High Level Innovative Talents Project(Grant No.QKHPTRC-GCC013-1) Innovation Team for Advanced Electrochemical Energy Storage Devices and Key Materials of Guizhou Provincial Higher Education Institutions(Grant No.QianJiaoJi054) Guizhou Provincial Science and Technology Projects(Grant No.QKHJC1Z042) Cultivation Project of Guizhou University(Grant No.GDPY01) 

主　　题：Shuttl eeffect Oxygen vacancy Interlayer Lithium-sulfur batteries 

摘      要：The“shuttle effectof lithium polysulfides(LiPSs)is a huge challenge for practical use of high-energydensity lithium-sulfur(Li-S)batteries,and one of the main reasons is the sluggish kinetics of sulfur *** oxides are able to expedite the sulfur electrochemistry,and the structural defects enhance the adsorption-conversion ability of metal oxides for ***,a significant research gap still remains regarding the relationship between the oxygen vacancy concentration and the adsorptivecatalytic performance of metal ***,we establish a correlation between oxygen vacancy concentration and adsorptive-catalytic properties by using tungsten oxide(WO_(x))as model *** is revealed that high-concentration oxygen vacancy is beneficial for enhancing the binding between tungsten oxide and LiPSs,reducing the energy barrier of Li_(2)S decomposition,and promoting polysulfide conversion ***,the Li-S batteries using the tungsten oxide with high-concentration oxygen vacancies deliver high initial discharge capacity of 1169 mA h g^(-1)at 0.2 C and 865 mA h g^(-1)at 2 C,low attenuation rate of 0.064%per cycle over 1100 cycles at 2 *** a high sulfur area loading of 5.34 mg cm^(-2),the Li-S batteries still exhibit high initial gravimetric capacity of 982 mA h g^(-1)at 0.1 C and areal capacity of 5.92 mA h cm^(-2).This work promotes the feasibility of defect engineering on metal oxides as an effective mean to enhance the practicality of Li-S batteries.