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首页> 外文期刊>Applied Surface Science >Nitrogen-Doped graphene coated FeS_2 microsphere composite as high-performance anode materials for sodium-ion batteries enhanced by the chemical and structural synergistic effect
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Nitrogen-Doped graphene coated FeS_2 microsphere composite as high-performance anode materials for sodium-ion batteries enhanced by the chemical and structural synergistic effect

机译：氮掺杂石墨烯包覆的FeS_2微球复合材料作为钠离子电池的高性能负极材料，具有化学和结构协同作用

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摘要

Developing high-performance anode materials for sodium-ion batteries with high rate capability and long-term cyclability remains challenging. FeS2, one of the most potential candidates, is massively hindered by its intrinsically low electronic conductivity, poor ionic diffusivity, and severe volume change during cycling. Considering these issues, FeS2itrogen-doped graphene composite (FeS2/N-G) has been proposed, where in-situ growth of FeS2 microspheres among N-doped graphene are confined into a diameter of 1-3 mu m and coated with the intact and uniform N-doped graphene decoration. Through the kinetic analysis and first-principles calculations, the heterointerface between FeS2 and N-doped graphene is found to play an essential role in improving electronic conductivity and facilitating Na+ diffusion kinetics. The uniform N-doped graphene coating also helps sustain good structural stability, which is revealed in morphology evolution examination. Because of the chemical and structural synergistic effect, FeS2/N-G can realize the robust and fast sodium-ion storage with delivering a reversible capacity of 251.7 mAh g(-1) over 10,000 cycles at 5 A g(-1). The superior electrochemical performance and simple synthetic procedure of FeS2/N-G demonstrate the feasibility of applying FeS2/N-G as a potential anode material for sodium-ion batteries.
机译：开发具有高倍率能力和长期可循环性的钠离子电池高性能阳极材料仍然具有挑战性。 FeS2是最有潜力的候选物之一，其固有的低电子电导率，较差的离子扩散率以及循环过程中的体积变化严重阻碍了其发展。考虑到这些问题，有人提出了FeS2 /氮掺杂石墨烯复合材料（FeS2 / NG），其中在N掺杂石墨烯中原位生长FeS2微球的直径被限制为1-3微米，并被完整地覆盖。均匀的N掺杂石墨烯装饰。通过动力学分析和第一性原理计算，发现FeS2和N掺杂石墨烯之间的异质界面在提高电子电导率和促进Na +扩散动力学方面起着至关重要的作用。均匀的N掺杂石墨烯涂层还有助于维持良好的结构稳定性，这在形态演变检查中可以看出。由于化学和结构的协同作用，FeS2 / N-G可以实现坚固且快速的钠离子存储，并在5 A g（-1）的10,000个循环中提供251.7 mAh g（-1）的可逆容量。 FeS2 / N-G的优异电化学性能和简单的合成步骤证明了将FeS2 / N-G用作钠离子电池的潜在阳极材料的可行性。

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  • 来源
    《Applied Surface Science》 |2020年第1期|144633.1-144633.10|共10页
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  • 作者单位

    Tianjin Univ Minist Educ Sch Mat Sci & Engn Key Lab Adv Ceram & Machining Technol Tianjin 300072 Peoples R China;

    Univ Calif Santa Barbara Dept Mech Engn Santa Barbara CA 93106 USA;

    Tianjin Univ Minist Educ Sch Mat Sci & Engn Key Lab Adv Ceram & Machining Technol Tianjin 300072 Peoples R China|Univ Calif Santa Barbara Dept Chem & Biochem Santa Barbara CA 93106 USA;

    Tianjin Polytech Univ State Key Lab Separat Membranes & Membrane Proc Sch Environm & Chem Engn Tianjin 300387 Peoples R China|Univ Calif Santa Barbara Dept Chem & Biochem Santa Barbara CA 93106 USA;

    Chinese Acad Sci Inst Proc Engn CAS Key Lab Green Proc & Engn Beijing 100190 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Iron disulfide; Nitrogen-doped graphene; Sodium-ion batteries; Anode materials; Long-term cyclability; Fast sodium-ion storage;

    机译：二硫化铁氮掺杂石墨烯;钠离子电池;阳极材料;长期可循环性;钠离子快速存储;

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