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首页> 外文期刊>Advanced energy materials >MoS_2/Graphene Nanosheets from Commercial Bulky MoS_2 and Graphite as Anode Materials for High Rate Sodium-Ion Batteries
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MoS_2/Graphene Nanosheets from Commercial Bulky MoS_2 and Graphite as Anode Materials for High Rate Sodium-Ion Batteries

机译：商业化的块状MoS_2和石墨制成的MoS_2 /石墨烯纳米片作为高速率钠离子电池的阳极材料

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摘要

Tuning heterointerfaces between hybrid phases is a very promising strategy for designing advanced energy storage materials. Herein, a low-cost, high-yield, and scalable two-step approach is reported to prepare a new type of hybrid material containing MoS2/graphene nanosheets prepared from ball-milling and exfoliation of commercial bulky MoS2 and graphite. When tested as an anode material for a sodium-ion battery, the as-prepared MoS2/graphene nanosheets exhibit remarkably high rate capability (284 mA h g(-1) at 20 A g(-1) (approximate to 30C) and 201 mA h g(-1) at 50 A g(-1) (approximate to 75C)) and excellent cycling stability (capacity retention of 95% after 250 cycles at 0.3 A g(-1)). Detailed experimental measurements and density functional theory calculation reveal that the functional groups in 2D MoS2/graphene heterostructures can be well tuned. The impressive rate capacity of the as-prepared MoS2/graphene hybrids should be attributed to the heterostructures with a low degree of defects and residual oxygen containing groups in graphene, which subsequently improve the electronic conductivity of graphene and decrease the Na+ diffusion barrier at the MoS2/graphene interfaces in comparison with the acid treated one.
机译：调整混合相之间的异质界面是设计高级储能材料的非常有前途的策略。在本文中，据报道，低成本，高产量且可扩展的两步法可制备一种新型的杂化材料，该杂化材料包含通过球磨以及商用大块MoS2和石墨的剥离制成的MoS2 /石墨烯纳米片。当作为钠离子电池的阳极材料进行测试时，所制备的MoS2 /石墨烯纳米片表现出极高的倍率能力（在20 A g（-1）（约30C）和201 mA时具有284 mA hg（-1）的能力。 hg（-1）在50 A g（-1）（大约75℃）下具有出色的循环稳定性（在0.3 A g（-1）下250次循环后容量保持率达到95％）。详细的实验测量和密度泛函理论计算表明，二维MoS2 /石墨烯异质结构中的官能团可以很好地调节。所制备的MoS2 /石墨烯杂化体令人印象深刻的速率能力应归因于具有低程度缺陷的异质结构和石墨烯中残留的含氧基团，从而提高了石墨烯的电子电导率并降低了MoS2上的Na +扩散势垒/石墨烯与酸处理过的相比。

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  • 来源
    《Advanced energy materials》 |2018年第10期|1702383.1-1702383.11|共11页
  • 作者

    Sun Dan; Ye Delai; Liu Ping; Tang Yougen; Guo Jun; Wang Lianzhou; Wang Haiyan;

  • 作者单位

    Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

    Univ Queensland, Sch Chem Engn, Nanomat Ctr, Brisbane, Qld 4072, Australia;

    Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

    Guizhou Normal Univ, Sch Chem & Mat Sci, Guiyang 550001, Guizhou, Peoples R China;

    Univ Queensland, Sch Chem Engn, Nanomat Ctr, Brisbane, Qld 4072, Australia;

    Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ball-milling exfoliation; defects; MoS2; Graphene; rate performance; sodium ion batteries;

    机译：球磨剥落;缺陷;MoS2;石墨烯;速率性能;钠离子电池;

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