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MoSe_2/N-Doped Carbon as Anodes for Potassium-Ion Batteries

机译：MoSe_2 / N掺杂碳作为钾离子电池的阳极

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摘要

Potassium-ion batteries (PIBs) have attracted considerable attention due to the low redox potential, low price, and abundance, in comparison to lithium and sodium. Herein, a novel potassium MoSe2/N-C battery with a new electrolyte, 1 m potassium bis(fluoro-slufonyl)imide in ethyl methyl carbonate, is reported. The MoSe2/N-C composite, which consists of carbon-coated MoSe2 nanosheets, is synthesized through solvothermal and annealing method. As an anode material for PIBs, it exhibits an outstanding rate performance and long cycling stability. Meanwhile, a reversible capacity of 258.02 mA h g(-1) is achieved after 300 cycles at 100 mA g(-1), obtaining a Coulombic efficiency close to 100%. Even at a high current density, it can maintain 218 and 197 mA h g(-1) at 500 and 1000 mA g(-1), respectively. The charge/discharge mechanism of MoSe2/N-C as the anode material for PIBs is investigated. These results reveal that the insertion and the extraction of K+ will lead to a phase transition of MoSe2. During the charge process, a part of the MoSe2 will transform to Mo15Se19 and the major final discharge product is K5Se3.
机译：与锂和钠相比，钾离子电池（PIB）由于具有较低的氧化还原电位，低廉的价格和丰富的容量而备受关注。在此，报道了一种新型的MoSe2 / N-C钾电池，该电池具有一种新的电解质，即碳酸乙甲酯中的1 m双（氟代-磺酰氟）酰亚胺钾盐。通过溶剂热退火法合成了由碳包覆的MoSe2纳米片组成的MoSe2 / N-C复合材料。作为PIB的负极材料，它具有出色的倍率性能和长循环稳定性。同时，在100 mA g（-1）下经过300次循环后，可逆容量为258.02 mA h g（-1），库仑效率接近100％。即使在高电流密度下，它也可以分别在500和1000 mA g（-1）下保持218和197 mA h g（-1）。研究了MoSe2 / N-C作为PIBs负极材料的充放电机理。这些结果表明，K +的插入和提取将导致MoSe2的相变。在充电过程中，MoSe2的一部分将转变为Mo15Se19，而最终的主要放电产物为K5Se3。

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  • 来源
    《Advanced energy materials》 |2018年第29期|1801477.1-1801477.7|共7页
  • 作者

    Ge JunMin; Fan Ling; Wang Jue; Zhang Qingfeng; Liu Zhaomeng; Zhang Erjin; Liu Qian; Yu Xinzhi; 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;

    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;

    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;

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

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    electrolyte; K5Se3; MoSe2/N-C; N-doped; potassium-ion batteries;

    机译：电解质;K5Se3;MoSe2 / N-C;N掺杂;钾离子电池;

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