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首页> 外文期刊>RSC Advances >Dodecylamine-derived thin carbon-coated single Fe3O4 nanocrystals for advanced lithium ion batteries
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Dodecylamine-derived thin carbon-coated single Fe3O4 nanocrystals for advanced lithium ion batteries

机译：用于高级锂离子电池的十二烷基胺衍生的薄碳涂覆的单氟苯镍纳米晶体

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摘要

Dodecylamine (DDA) was functionalized on Fe2O3 nanocrystals (NCs) by a solvothermal process to allow electrostatic interaction on Bronsted acid sites induced on the surface of NCs, followed by carbonization to convert DDA into a thin layer of carbon on single Fe3O4 NCs. The obtained carbon composite (IOC-Fe3O4) is composed of Fe3O4 NCs a few nanometers in size, each uniformly coated with a thin carbon layer. The carbon coating reduces the resistance at the NC-to-NC interface within the composite and retains a short lithium diffusion length by inhibiting crystal growth, as well as accommodating the volume change of Fe3O4 during charge-discharge. The composite electrode exhibited a high reversible capacity of 1027 mA h g (1) in a lithium ion battery, as well as 100% capacity retention after 300 cycles and rate performance of 563 mA h g(-1) at 3 A g(-1), which was achieved with only 4.2 wt% carbon in the composite. The relationship between the enhanced diffusion kinetics of IOC-Fe3O4 and excellent electrochemical performances is demonstrated through a voltammetric charge technique.
机译：通过溶剂热法在Fe 2 O 3纳米晶体（NCS）上官能化十二烷基胺（DDA），以允许在NCS表面上诱导的抗正囊位点上的静电相互作用，然后碳化将DDA转化为单个Fe 3 O 4 NC上的薄层碳层。所得碳复合物（IOC-Fe3O4）由Fe3O4 NCS尺寸的Fe3O 4 NC组成，每个纳米均匀涂覆有薄碳层。碳涂层降低了在复合材料内的NC到NC界面的电阻，并保留通过抑制结晶生长，以及容纳在充放电的Fe3O4的体积变化很短的锂扩散长度。复合电极在锂离子电池中表现出1027mA Hg（1）的高可逆容量，以及300次循环后的100％容量保持，并且在3A（-1）下为563 mA Hg（-1）的速率性能，在复合材料中只有4.2重量％的碳。通过伏安电荷技术证明了IOC-Fe3O4的增强扩散动力学和优异的电化学性能之间的关系。

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  • 来源
    《RSC Advances》 |2016年第44期|共6页
  • 作者

    Cho Min-Young; Yoon Seung-Beom; Kim Kwang-Bum; Jung Dae Soo; Roh Kwang Chul;

  • 作者单位

    Korea Inst Ceram Engn &

    Technol Div Energy &

    Environm Energy Mat Team 101 Soho Ro Jinju Si 52851 Gyeongsangnam D South Korea;

    Samsung SDI Battery Business 467 Beonyeong Ro Cheonan Si 31086 Chungcheongnam South Korea;

    Yonsei Univ Dept Mat Sci &

    Engn 50 Yonsei Ro Seoul 03722 South Korea;

    Korea Inst Ceram Engn &

    Technol Div Energy &

    Environm Eco Composite Mat Team 101 Soho Ro Jinju Si 52851 Gyongsangnam Do South Korea;

    Korea Inst Ceram Engn &

    Technol Div Energy &

    Environm Energy Mat Team 101 Soho Ro Jinju Si 52851 Gyeongsangnam D South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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