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Graphene reinforced carbon nanofiber engineering enhances Li storage performances of germanium oxide

机译：石墨烯增强碳纳米河工程增强了氧化锗的李储存性能

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摘要

The rational design of electrode materials with high power and energy densities, good operational safety, and long cycle life remains a great challenge for developing advanced battery systems. As a promising electrode material for rechargeable batteries, germanium oxide (GeO2) shows high capacity, but suffers from rapid capacity fading caused by its large volume variation during charge/discharge processes and poor rate performance owing to low intrinsic electronic conductivity. In this study, a novel one-dimensional (1D) carbon/graphene-nanocable-GeO2 nanocomposite (denoted as GeO2/nanocable) is rationally designed and prepared via a facile electrospinning method. Specifically, amorphous carbon and graphene spontaneously construct a nanocable structure, in which graphene acts as the "core" and amorphous carbon as the "shell", and GeO2 nanoparticles are encapsulated in the nanocable. The graphene "core" promises good electrical conductivity while the amorphous carbon "shell" guarantees fast Li ions diffusion. When tested as an anode material for rechargeable lithium ion batteries, the GeO2/nanocable exhibits remarkable Li storage performance, including high reversible capacity (900 mA h g(-1)), high capacity retention (91% after 100 cycles), and good rate performance (595 mA h g(-1) at 5000 mA g(-1)).
机译：具有高功率和能量密度的电极材料的合理设计，良好的操作安全性和长循环寿命仍然是开发先进电池系统的巨大挑战。作为可充电电池的有希望的电极材料，氧化锗（Geo2）显示出高容量，但由于由于内在电子电导率低，因此由于其电荷/放电过程中的大体积变化和差的速率性能而遭受的快速容量衰落。在该研究中，一种新颖的一维（1D）碳/石墨烯 - 纳米可纳米可纳米复合材料（表示为Geo2 /纳米可填充）是合理的设计和制备的，通过容易的静电纺丝法设计和制备。具体地，无定形碳和石墨烯自发地构建纳米可防围结构，其中石墨烯作为“壳”和无定形碳作为“壳”，而Geo2纳米颗粒被包封在纳米可填充中。石墨烯“核心”在无定形碳“壳”的同时承诺良好的导电性，保证快速锂离子扩散。当测试为可充电锂离子电池的阳极材料时，Geo2 /纳米可呈现出色的Li储存性能，包括高可逆容量（900 mA Hg（-1）），高容量保留（100次循环后91％），并且速度良好性能（595 mA hg（-1），5000 mA g（-1））。

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  • 来源
    《RSC Advances》 |2020年第18期|共6页
  • 作者

    Zhang Xu; Wei Wei; Wang Kefeng; Xiao Guoqing; Xu Maotian;

  • 作者单位

    Xian Univ Architecture &

    Technol Coll Mat Sci &

    Engn Xian 710055 Peoples R China;

    Shangqiu Normal Univ Henan Engn Ctr New Energy Battery Mat Henan Key Lab Bimol Reorganizat &

    Sensing Sch Chem &

    Chem Engn Shangqiu 476000 Peoples R China;

    Shangqiu Normal Univ Henan Engn Ctr New Energy Battery Mat Henan Key Lab Bimol Reorganizat &

    Sensing Sch Chem &

    Chem Engn Shangqiu 476000 Peoples R China;

    Xian Univ Architecture &

    Technol Coll Mat Sci &

    Engn Xian 710055 Peoples R China;

    Shangqiu Normal Univ Henan Engn Ctr New Energy Battery Mat Henan Key Lab Bimol Reorganizat &

    Sensing Sch Chem &

    Chem Engn Shangqiu 476000 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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