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首页> 外文期刊>Advanced Functional Materials >Synergistic Effect between S and Se Enhancing the Electrochemical Behavior of Se_xS_y in Aqueous Zn Metal Batteries
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Synergistic Effect between S and Se Enhancing the Electrochemical Behavior of Se_xS_y in Aqueous Zn Metal Batteries

机译：S和SE之间的协同效应增强SE_XS_Y水溶液中SE_XS_Y的电化学行为

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摘要

Developing high-capacity conversional cathode materials for aqueous Zn batteries is promising to improve their energy densities but challenging as well. In this work, three kinds of selenium-sulfur solid solutions and their composites (denoted as SeS14 @ 3D-NPCF, SeS5.76 @ 3D-NPCF, and SeS2.46 @ 3D-NPCF) are proposed and systematically investigated. Due to the introduction of Se and its synergistic effect with S, their physical and electrochemical properties are manipulated; in particular, by optimizing the Se content in these composites, SeS5.76 @ 3D-NPCF shows a capacity of 1222 mAh g(-1) and flat plateau of 0.71 V at 0.2 A g(-1), reaching an ultrahigh energy density of 867.6 Wh kg(-1) (based on SeS5.76), superior rate capacity of 713 mAh g(-1) at 5 A g(-1), and stable cycling of 75% capacity retention after 500 cycles. In addition, the Zn storage kinetics is determined by the discharge process, during which SeS5.76 @ 3D-NPCF is converted into ZnSe and ZnS. More importantly, theoretical calculations reveal that Se can tailor the electron density difference, band structure, and reaction energy of S, which increase its conductivity and reactivity to facilitate the electrochemical reaction with Zn. This work explores high performance conversional cathode materials for aqueous Zn metal batteries and presents an effective strategy to modify their intrinsic properties.
机译：开发用于锌电池水溶液的高容量交易阴极材料很有希望改善它们的能量密度，而且也是具有挑战性的。在这项工作中，提出了三种硒 - 硫固体溶液及其复合材料（用SES14 @ 3D-NPCF，SES5.76 @ 3D-NPCF和SES2.46 @ 3D-NPCF）提出并系统地研究。由于SE的引入及其对S的协同效应，操纵其物理和电化学性质;特别地，通过优化这些复合材料中的SE含量，SES5.76 @ 3D-NPCF显示了1222mAhg（-1）的容量，平坦的平台为0.2Ag（-1），达到超高能量密度867.6 WH kg（-1）（基于SES5.76），优越的速率容量为713mAhg（-1），5Ag（-1），500次循环后的75％容量保持稳定的循环循环。另外，Zn存储动力学由放电过程确定，在此期间SES5.76 @ 3D-NPCF被转换为ZnSe和ZnS。更重要的是，理论计算揭示SE可以根据SE定制S的电子密度差，带结构和反应能量，这增加了其导电性和反应性，以促进与Zn的电化学反应。这项工作探讨了Zn金属电池水溶液的高性能交易阴极材料，并提出了一种改变其固有特性的有效策略。

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  • 来源
    《Advanced Functional Materials》 |2021年第20期|2101237.1-2101237.11|共11页
  • 作者

    Li Wei; Ma Yongsong; Li Peng; Jing Xiaoyun; Jiang Kai; Wang Dihua;

  • 作者单位

    Wuhan Univ Hubei Int Sci & Technol Cooperat Base Sustainable Sch Resource & Environm Sci Wuhan 430072 Peoples R China;

    Wuhan Univ Hubei Int Sci & Technol Cooperat Base Sustainable Sch Resource & Environm Sci Wuhan 430072 Peoples R China;

    Wuhan Univ Hubei Int Sci & Technol Cooperat Base Sustainable Sch Resource & Environm Sci Wuhan 430072 Peoples R China;

    Wuhan Univ Hubei Int Sci & Technol Cooperat Base Sustainable Sch Resource & Environm Sci Wuhan 430072 Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn Wuhan 430074 Peoples R China;

    Wuhan Univ Hubei Int Sci & Technol Cooperat Base Sustainable Sch Resource & Environm Sci Wuhan 430072 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    aqueous Zn metal batteries; cathodes; conversion mechanism; Se; S-x; (y); synergistic effect;

    机译：Zn金属电池水溶液;阴极;转换机制;SE;S-X;（Y）;协同效应;

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