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Fabrication of double core-shell Si-based anode materials with nanostructure for lithium-ion battery

机译：锂离子电池纳米结构的双核 - 壳Si阳极材料的制备

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摘要

Yolk-shell structure is considered to be a well-designed structure of silicon-based anode. However, there is only one point (point-to-point contact) in the contact region between the silicon core and the shell in this structure, which severely limits the ion transport ability of the electrode. In order to solve this problem, it is important that the core and shell of the core-shell structure are closely linked (face-to-face contact), which ensures good ion diffusion ability. Herein, a double core-shell nanostructure (Si@C@SiO2) was designed for the first time to improve the cycling performance of the electrode by utilising the unique advantages of the SiO2 layer and the closely contacted carbon layer. The improved cycling performance was evidenced by comparing the cycling properties of similar yolk-shell structures (Si@void@SiO2) with equal size of the intermediate shell. Based on the comparison and analysis of the experimental data, Si@C@SiO2 had more stable cycling performance and exceeded that of Si@void@SiO2 after the 276th cycle. More interestingly, the electron/ion transport ability of electrode was further improved by combination of Si@C@SiO2 with reduced graphene oxide (RGO). Clearly, at a current density of 500 mA g(-1), the reversible capacity was 753.8 mA h g(-1) after 500 cycles, which was 91% of the specific capacity of the first cycle at this current density.
机译：YOLK-壳结构被认为是硅基阳极的精心设计的结构。然而，在该结构中，在硅芯和壳之间的接触区域中只有一个点（点对点接触），这严重限制了电极的离子传输能力。为了解决这个问题，重要的是核心壳结构的核心和壳体紧密连接（面对面接触），这确保了良好的离子扩散能力。在此，首次设计了一种双核 - 壳纳米结构（Si @ SiO 2）以通过利用SiO 2层和紧密接触的碳层的独特优点来改善电极的循环性能。通过比较具有相同尺寸的中间壳的类似蛋黄壳结构（Si @ Void @ SiO2）的循环性能来证明改进的循环性能。基于对实验数据的比较和分析，Si @ SiO2具有更稳定的循环性能，并在第276个周期之后超过了Si @ Void @ Si2的循环性能。更有趣的是，通过用氧化石墨烯（RGO）的Si-C 2 SiO 2组合进一步改善电极的电子/离子传输能力。显然，在电流密度为500mAg（-1），500次循环后可逆容量为753.8mA Hg（-1），其在该电流密度下为第一循环的比例的91％。

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  • 来源
    《RSC Advances》 |2018年第17期|共9页
  • 作者

    Wu Pengfei; Guo Changqing; Han Jiangtao; Yu Kairui; Dong Xichao; Yue Guanghui; Yue Huijuan; Guan Yan; Liu Anhua;

  • 作者单位

    Xiamen Univ Coll Mat Key Lab High Performance Ceram Fibers Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Mat Key Lab High Performance Ceram Fibers Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Mat Dept Mat Sci &

    Engn Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Mat Fujian Key Lab Adv Mat Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Mat Key Lab High Performance Ceram Fibers Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Mat Dept Mat Sci &

    Engn Xiamen 361005 Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Peking Univ Coll Chem &

    Mol Engn Beijing 100871 Peoples R China;

    Xiamen Univ Coll Mat Key Lab High Performance Ceram Fibers Xiamen 361005 Peoples R China;

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