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Boosting the lithium and sodium storage performance of graphene-based composite via pore engineering and surface protection

机译：通过孔工程和表面保护促进石墨烯复合材料锂和钠储存性能

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摘要

Transition metal oxides with high theoretical capacities are widely investigated as potential anodes for alkali-metal ion batteries. However, the intrinsic conductivity deficiency and large volume changes during cycles result in poor cycling stability and low rate capabilities. Graphene has been widely used to support metal oxide for enhanced performance, but the cycling life is limited by the aggregation/collapse of active materials on graphene surface. Herein, we significantly improve the battery performance of graphene-metal oxide composite via pore engineering and surface protection. In this architecture, the mesoporous NiFe2O4 is designed for fast ion diffusion and volume accommodation, and the outer graphene protection can further enhance the electrical conductivity and prevent the aggregation during cycle. Thus, as-prepared G@p-NiFe2O4@G composite for lithium storage delivers high capacity (1244 mA h g(-1) after 300 cycles at 0.2 A g(-1)), excellent rate performance (563 mA h g(-1) at 4 A g(-1)), and outstanding cycling life up to 1200 cycles at 1.5 A g(-1). For sodium storage, it also displays good cycling stability and superior rate performance. Moreover, the effects of various microstructures on the battery performance, the reaction kinetics of various electrodes, and the reaction mechanism of NiFe2O4 have been systematically investigated in this work.
机译：作为碱金属离子电池的潜在阳极，具有较高理论容量的过渡金属氧化物被广泛研究。然而，固有导电性不足和循环期间的大体积变化导致循环稳定性差和低速率能力。石墨烯被广泛用于支撑金属氧化物以提高性能，但石墨烯表面活性材料的聚集/崩塌限制了其循环寿命。在此，我们通过孔工程和表面保护显著改善了石墨烯-金属氧化物复合材料的电池性能。在这种结构中，介孔NiFe2O4被设计用于快速离子扩散和体积调节，外部石墨烯保护可以进一步增强导电性并防止循环过程中的聚集。因此，正如所准备的那样G@p-NiFe2O4@G用于锂存储的复合材料在0.2 A g（-1）下进行300次循环后可提供高容量（1244 mA h g（-1）），在4 A g（-1）下可提供优异的速率性能（563 mA h g（-1）），在1.5 A g（-1）下可提供高达1200次循环的出色循环寿命。对于钠存储，它还表现出良好的循环稳定性和优越的速率性能。此外，本文还系统地研究了不同微观结构对电池性能的影响、不同电极的反应动力学以及NiFe2O4的反应机理。

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  • 来源
    《Nanotechnology》 |2021年第10期|共13页
  • 作者

    Wu Hefeng; Gan Yanmei; Yao Qianqian; Wang Luyuan Paul; Wang Chaoying; Zhang Qixin; Hou Kun; Zhao Yi; Guan Lunhui;

  • 作者单位

    Fuzhou Univ Coll Chem Fuzhou 350108 Fujian Peoples R China;

    Fuzhou Univ Coll Chem Fuzhou 350108 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

    Nanyang Technol Univ Sch Mat Sci &

    Engn 50 Nanyang Ave Singapore 639798 Singapore;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    NiFe2O4; porous structure; graphene coating; lithium-ion batteries; sodium-ion batteries;

    机译：NiFe2O4;多孔结构;石墨烯涂层;锂离子电池;钠离子电池;

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