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首页> 外文期刊>Advanced energy materials >An Iodine Quantum Dots Based Rechargeable Sodium-Iodine Battery
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An Iodine Quantum Dots Based Rechargeable Sodium-Iodine Battery

机译：基于碘量子点的可充电钠碘电池

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摘要

Rechargeable sodium-iodine batteries represent a promising scalable electrochemical energy storage alternative as sodium and iodine are both low cost and widely abundant elements. Here, the authors demonstrate a rechargeable sodium-iodine battery that employs free-standing iodine quantum dots (IQDs) decorated reduced graphene oxide (IQDs@RGO) as the cathode. Consistent with the density functional theory the authors find the Na+ ions to intercalate into the I unit cell forming stable NaI, and the battery exhibits high capacity, outstanding cycle stability (with a reversible specific capacity of 141 mA h g(-1) after 500 cycles at current density of 100 mA g(-1)), and high rate performance (170, 146, 127, 112, and 95 mA h g(-1) at current densities of 100, 200, 400, 600, and 1000 mA g(-1), respectively). The reversible reactions, I-2/I-3(-) and I-3(-)/I- redox couples on insertion of Na+ ions, are confirmed via in situ Raman spectroscopy. Notably, even after 500 cycles the morphology and structure of the IQDs exhibit no noticeable change implying their use as a stable cathode material for sodium-iodine batteries. Moreover, the IQDs based flexible full-cells also exhibit high capacity and long cycle life (the capacity with 123 mA h g(-1) at current density of 100 mA g(-1) after 100 cycles).
机译：可充电的钠碘电池代表了一种有前途的可扩展的电化学储能方案，因为钠和碘都是低成本且广泛使用的元素。在这里，作者演示了一种可充电钠碘电池，该电池采用独立的碘量子点（IQDs）装饰的还原氧化石墨烯（IQDs @ RGO）作为阴极。与密度泛函理论一致，作者发现Na +离子可插入I晶胞中形成稳定的NaI，并且该电池表现出高容量，出色的循环稳定性（500次循环后可逆比容量为141 mA hg（-1））在电流密度为100 mA g（-1）时）和高速率性能（170、146、127、112和9​​5 mA hg（-1）在电流密度为100、200、400、600和1000 mA g时） （-1））。通过原位拉曼光谱证实在插入Na +离子时可逆反应I-2 / I-3（-）和I-3（-）/ I-氧化还原对。值得注意的是，即使经过500次循环，IQD的形态和结构也没有显示出明显的变化，这暗示着它们被用作钠碘电池的稳定阴极材料。此外，基于IQD的柔性全电池还具有高容量和长循环寿命（100个循环后在100 mA g（-1）的电流密度下具有123 mA h g（-1）的容量）。

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  • 来源
    《Advanced energy materials》 |2017年第3期|1601885.1-1601885.10|共10页
  • 作者

    Gong Decai; Wang Bin; Zhu Jingyi; Podila Ramakrishna; Rao Apparao M.; Yu Xinzhi; Xu Zhi; Lu Bingan;

  • 作者单位

    Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China|Xinxiang Univ, Phys & Elect Engn Dept, Xinxiang 453003, Peoples R China;

    Clemson Univ, Dept Phys & Astron, Clemson Nanomat Ctr, Clemson, SC 29634 USA|Clemson Univ, COMSET, Clemson, SC 29634 USA;

    Clemson Univ, Dept Phys & Astron, Clemson Nanomat Ctr, Clemson, SC 29634 USA|Clemson Univ, COMSET, Clemson, SC 29634 USA;

    Clemson Univ, Dept Phys & Astron, Clemson Nanomat Ctr, Clemson, SC 29634 USA|Clemson Univ, COMSET, Clemson, SC 29634 USA;

    Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    full-cells; graphene; in situ Raman spectroscopy; iodine quantum dots; sodium-iodine batteries;

    机译：全电池石墨烯原位拉曼光谱碘量子点钠碘电池;

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