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3D MoS_2-Graphene Microspheres Consisting of Multiple Nanospheres with Superior Sodium Ion Storage Properties

机译：3D MoS_2-石墨烯微球，由多个具有优越的钠离子存储特性的纳米球组成

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摘要

A novel anode material for sodium-ion batteries consisting of 3D graphene microspheres divided into several tens of uniform nanospheres coated with few-layered MoS_2 by a one-pot spray pyrolysis process is prepared. The first discharge/charge capacities of the composite microspheres are 797 and 573 mA h g~(-1) at a current density of 0.2 A g~(-1). The 600th discharge capacity of the composite microspheres at a current density of 1.5 A g~(-1) is 322 mA h g~(-1). The Coulombic efficiency during the 600 cycles is as high as 99.98%. The outstanding Na ion storage properties of the 3D MoS_2-graphene composite microspheres may be attributed to the reduced stacking of the MoS_2 layers and to the 3D structure of the porous graphene microspheres. The reduced stacking of the MoS_2 layers relaxes the strain and lowers the barrier for Na~+ insertion. The empty nanospheres of the graphene offer voids for volume expansion and pathways for fast electron transfer during repeated cycling.
机译：制备了一种新颖的钠离子电池负极材料，该材料由3D石墨烯微球组成，该碳纳米球通过一锅法喷雾热解工艺分成几十个均匀的纳米球，并涂覆有很少层的MoS_2。在电流密度为0.2 A g〜（-1）时，复合微球的首次充放电容量为797和573 mA h g〜（-1）。在1.5 A g〜（-1）的电流密度下，复合微球的600放电容量为322 mA h g〜（-1）。 600个循环中的库仑效率高达99.98％。 3D MoS_2-石墨烯复合微球的出色的Na离子存储性能可能归因于MoS_2层的堆积减少和多孔石墨烯微球的3D结构。 MoS_2层堆叠的减少可减轻应变，并降低Na +插入的势垒。石墨烯的空纳米球在重复循环期间提供了用于体积膨胀的空隙和用于快速电子转移的途径。

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  • 来源
    《Advanced Functional Materials》 |2015年第12期|1780-1788|共9页
  • 作者

    Seung Ho Choi; You Na Ko; Jung-Kul Lee; Yun Chan Kang;

  • 作者单位

    Department of Materials Science and Engineering Korea University Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea;

    Department of Materials Science and Engineering Korea University Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea;

    Department of Chemical Engineering Konkuk University 1 Hwayang-Dong Gwangjin-Gu, Seoul 143-701, Republic of Korea;

    Department of Materials Science and Engineering Korea University Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea;

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