A Universal Graphene-Selenide Heterostructured Reservoir with Elevated Polysulfide Evolution Efficiency for Pragmatic Lithium-Sulfur Battery

Menglei Wang; Yujie Zhu; Yingjie SunYu ZhaoXianzhong YangXiaojing WangYingze SongHaina CiJingyu Sun

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A Universal Graphene-Selenide Heterostructured Reservoir with Elevated Polysulfide Evolution Efficiency for Pragmatic Lithium-Sulfur Battery

机译：A Universal Graphene-Selenide Heterostructured Reservoir with Elevated Polysulfide Evolution Efficiency for Pragmatic Lithium-Sulfur Battery

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The practical application of lithium-sulfur (Li–S) batteries has been handicappedby the notorious polysulfide shuttling and sluggish sulfur conversionkinetics. Although the functional modification of separator is readily proposedas an effective strategy to optimize the Li–S redox reactions, the excessivematerial dosage and invalid structural design still result in inferior electrocatalystutilization. Herein, generic graphene-metal selenide heterostructures(Gr-M_xSe_y, M = Mo, W, Mn, Cu and Zn) are controllably grown on commercialglass fiber (GF) separator employing a sequential low-temperaturechemical vapor deposition procedure. Such a tailored reservoir can not onlyrender ample active sites but also realize the synergy of polar and catalyticframework, which maximizes the electrochemical functions in alleviatingshuttle effect and guiding Li_2S nucleation/decomposition. The thus-derivedGr-M_xSe_y/GF separator affording favorable heatproof feature endows the Li-Sbattery with an outstanding cycling stability (100% capacity retention over100 cycles at 0.2 C). Furthermore, the flexible Li-S pouch cell based on thisnew separator delivers good device performance (with a capacity decay of0.25% per cycle over 100 cycles). This study offers comprehensive insight intothe reliable separator design toward working Li-S batteries.

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来源
《Advanced functional materials》 |2023年第6期|2211978.1-2211978.8|共8页
作者
Menglei Wang; Yujie Zhu; Yingjie SunYu ZhaoXianzhong YangXiaojing WangYingze SongHaina CiJingyu Sun;
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College of Energy Soochow Institute for Energy and Materials Innovations Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006, P. R. China;

Hebei Key Laboratory of Photoelectric Control on Surface and Interface College of Science Hebei University of Science and Technology Shijiazhuang 050018, P. R. China;

State Key Laboratory of Environment-Friendly Energy Materials Tianfu Institute of Research and Innovation School of Materials and Chemistry Southwest University of Science and Technology Mianyang 621010, P. R. ChinaCollege of Electromechanical Engineering Qingdao University of Science and Technology Qingdao 266061, P. R. China;

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glass fiber separators; graphene-selenide heterostructures; lithium-sulfur batteries; polysulfide evolution; universal;

A Universal Graphene-Selenide Heterostructured Reservoir with Elevated Polysulfide Evolution Efficiency for Pragmatic Lithium-Sulfur Battery

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