Lithium cation-doped tungsten oxide as a bidirectional nanocatalyst for lithium-sulfur batteries with high areal capacity  

作　　者：Biying Wang Ke Chen Jieying Liang Zhichun Yu Da-Wei Wang Ruopian Fang 

机构地区：[1]School of Chemical Engineering,The University of New South Wales,Sydney,NSW 2052,Australia [2]Faculty of Materials Science and Energy Engineering,Shenzhen University of Advanced Technology,Shenzhen 518055,Guangdong,China [3]Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第11期406-413,共8页能源化学（英文版）

基　　金：financially Australian Research Council (DE210101157 and FT190100058)。

摘　　要：Lithium-sulfur(Li-S) batteries are promising for high energy-storage applications but suffer from sluggish conversion reaction kinetics and substantial lithium sulfide(Li_(2)S) oxidation barrier,especially under high sulfur loadings.Here,we report a Li cation-doped tungsten oxide(Li_(x)WO_(x)) electrocatalyst that efficiently accelerates the S■HLi_(2)S interconversion kinetics.The incorporation of Li dopants into WO_(x) cationic vacancies enables bidirectional electrocatalytic activity for both polysulfide reduction and Li_(2)S oxidation,along with enhanced Li^(+) diffusion.In conjunction with theoretical calculations,it is discovered that the improved electrocatalytic activity originates from the Li dopant-induced geometric and electronic structural optimization of the Li_(x)WO_(x),which promotes the anchoring of sulfur species at favourable adsorption sites while facilitating the charge transfer kinetics.Consequently,Li-S cells with the Li_(x)WO_(x) bidirectional electrocatalyst show stable cycling performance and high sulfur utilization under high sulfur loadings.Our approach provides insights into cation engineering as an effective electrocatalyst design strategy for advancing high-performance Li-S batteries.

关 键 词：Cation engineering Electrocatalysis Polysulfide conversion Lithium sulfide oxidation Lithium-sulfur batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程] TQ426[化学工程]