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首页> 外文期刊>Advanced Functional Materials >Rational Design of MXene/1T-2H MoS_2-C Nanohybrids for High-Performance Lithium-Sulfur Batteries
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Rational Design of MXene/1T-2H MoS_2-C Nanohybrids for High-Performance Lithium-Sulfur Batteries

机译：高性能锂硫电池MXene / 1T-2H MoS_2-C纳米混合材料的合理设计

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摘要

Despite high-energy density and low cost of the lithium-sulfur (Li-S) batteries, their commercial success is greatly impeded by their severe capacity decay during long-term cycling caused by polysulfide shuttling. Herein, a new phase engineering strategy is demonstrated for making MXene/1T-2H MoS2-C nanohybrids for boosting the performance of Li-S batteries in terms of capacity, rate ability, and stability. It is found that the plentiful positively charged S-vacancy defects created on MXene/1T-2H MoS2-C, proved by high-resolution transmission electron microscopy and electron paramagnetic resonance, can serve as strong adsorption and activation sites for polar polysulfide intermediates, accelerate redox reactions, and prevent the dissolution of polysulfides. As a consequence, the novel MXene/1T-2H MoS2-C-S cathode delivers a high initial capacity of 1194.7 mAh g(-1) at 0.1 C, a high level of capacity retention of 799.3 mAh g(-1) after 300 cycles at 0.5 C, and reliable operation in soft-package batteries. The present MXene/1T-2H MoS2-C becomes among the best cathode materials for Li-S batteries.
机译：尽管锂硫（Li-S）电池具有高能量密度和低成本，但由于聚硫化物穿梭而导致的长期循环期间其严重的容量衰减严重阻碍了其商业成功。在本文中，展示了一种新的相工程策略，该策略用于制造MXene / 1T-2H MoS2-C纳米杂化物，从而在容量，倍率能力和稳定性方面提高Li-S电池的性能。发现通过高分辨率透射电子显微镜和电子顺磁共振证明，在MXene / 1T-2H MoS2-C上产生的大量带正电的S空位缺陷可作为极性多硫化物中间体的强吸附和活化位点，加速氧化还原反应，并防止多硫化物溶解。结果，新型MXene / 1T-2H MoS2-CS阴极在0.1 C时可提供1194.7 mAh g（-1）的高初始容量，在300次循环下可保持799.3 mAh g（-1）的高容量。 0.5 C，在软包装电池中可靠运行。目前的MXene / 1T-2H MoS2-C成为用于Li-S电池的最佳正极材料之一。

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  • 来源
    《Advanced Functional Materials》 |2018年第38期|1707578.1-1707578.9|共9页
  • 作者

    Zhang Yelong; Mu Zijie; Yang Chao; Xu Zhikun; Zhang Shan; Zhang Xiaoyan; Li Yingjie; Lai Jianping; Sun Zhonghui; Yang Yong; Chao Yuguang; Li Chunji; Ge Xiaoxiao; Yang Wenxiu; Guo Shaojun;

  • 作者单位

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Harbin Normal Univ, Sch Phys & Elect Engn, Minist Educ, Key Lab Photon & Elect Bandgap Mat, Harbin 150025, Heilongjiang, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    lithium-sulfur batteries; MoS2; MXene; nanohybrids; polysulfides;

    机译：锂硫电池MoS2 MXene纳米杂化物多硫化物;

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