The insulating nature of sulfur species,sluggish reaction kinetics,and uncontrolled dissolution of lithium polysulfide(LiPS)intermediates during the complex and multiphase sulfur redox process,have severely inhibited the applications of Li-S batteries.In this study,we report a rational strategy to accelerate the polysulfide catalysis via constructing phosphorus modulated porous CeO2(P-CeO2)for advanced Li-S batteries.The morphology and surface analysis demonstrate that the P-CeO2 consists of abundant P-modulated porous CeO2 nanocrystallines.The battery performance reveals that the introduction of P will lead to an improved initial capacity of 1027 mA h g-1 than that of bare CeO2(895.7 mA h g-1)at 0.2 C.In addition,the P-CeO2 cathode can maintain a low capacity decay ratio of 0.10％per cycle after 500 cy-cles at 1.0 C.The coin battery tests suggest that the P-CeO2 cathode presents faster oxidation-reduction kinetics of LiPS and quick diffusion of Li+ions.Meanwhile,the studies of redox processes and chemical interactions of LiPS have demonstrated the P-CeO2 cathode displays stronger adsorption of Li2S6,higher redox peak current,and earlier precipitation of Li2S than the bare CeO2.This study demonstrates for the first time that the P-modulation of metal oxide surface can simultaneously promote the catalytic reaction kinetics and chemical interaction of LiPS.We anticipate that this P-modulation method can be extended to many other nanostructured metal catalytic sites for developing affordable advanced Li-S batteries.

Xuefeng Tao;Zhao Yang;Menghao Cheng;Rui Yan;Fan Chen;Sujiao Cao;Shuang Li;Tian Ma;Chong Cheng;Wei Yang

College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Department of Ultrasound,National Clinical Research Center for Geriatrics,West China Hospital,Sichuan University,Chengdu 610041,China

材料科学技术（英文版）

[1]Xuefeng Tao;Zhao Yang;Menghao Cheng;Rui Yan;Fan Chen;Sujiao Cao;Shuang Li;Tian Ma;Chong Cheng;Wei Yang-.Phosphorus modulated porous CeO2 nanocrystallines for accelerated polysulfide catalysis in advanced Li-S batteries)[J].材料科学技术（英文版）,2022(36):212-220

nanocrystallines,LiPS,Li2S6

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