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首页> 外文期刊>Advanced energy materials >Controlling Surface Oxides in Si/C Nanocomposite Anodes for High-Performance Li-Ion Batteries
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Controlling Surface Oxides in Si/C Nanocomposite Anodes for High-Performance Li-Ion Batteries

机译：用于高性能锂离子电池的Si / C纳米复合阳极中的表面氧化物控制

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摘要

Si/C composites represent one promising class of anode materials for next-generation lithium-ion batteries. To achieve high performances of Si-based anodes, it is critical to control the surface oxide of Si particles, so as to harness the chemomechanical confinement effect of surface oxide on the large volume changes of Si particles during lithiation/delithiation. Here a systematic study of Si@SiOx/C nanocomposite electrodes consisting of Si nanoparticles covered by a thin layer of surface oxide with a tunable thickness in the range of 1-10 nm is reported. It is shown that the oxidation temperature and time not only control the thickness of the surface oxide, but also change the structure and valence state of Si in the surface oxide. These factors can have a strong influence on the lithiation/delithiation behavior of Si nanoparticles, leading to different electrochemical performances. By combining experimental and modeling studies, an optimal thickness of about 5 nm for the surface oxide layer of Si nanoparticles is identified, which enables a combination of high capacity and long cycle stability of the Si@SiOx/C nanocomposite anodes. This work provides an in-depth understanding of the effects of surface oxide on the Si/C nanocomposite electrodes. Insights gained are important for the design of high-performance Si/C composite electrodes.
机译：Si / C复合材料代表了下一代锂离子电池阳极材料的一类很有希望的前景。为了获得高性能的硅基阳极，至关重要的是控制硅颗粒的表面氧化物，以便在锂化/脱锂过程中利用表面氧化物对硅颗粒的大体积变化的化学机械限制作用。在这里，对由Si纳米粒子组成的Si @ SiOx / C纳米复合电极的系统研究进行了报道，该纳米粒子被表面氧化物薄层覆盖，厚度可调范围为1-10 nm。结果表明，氧化温度和时间不仅控制着表面氧化物的厚度，而且改变了表面氧化物中Si的结构和价态。这些因素可能会对Si纳米颗粒的锂化/脱锂行为产生重大影响，从而导致不同的电化学性能。通过结合实验和模型研究，确定了Si纳米颗粒表面氧化物层的最佳厚度约为5 nm，这使Si @ SiOx / C纳米复合阳极具有高容量和长循环稳定性。这项工作提供了对表面氧化物对Si / C纳米复合电极的影响的深入理解。获得的见解对于设计高性能Si / C复合电极非常重要。

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  • 来源
    《Advanced energy materials》 |2018年第29期|1801718.1-1801718.12|共12页
  • 作者

    Zheng Guorui; Xiang Yuxuan; Xu Liangfan; Luo Hao; Wang Baolin; Liu Yang; Han Xiang; Zhao Weimin; Chen Shijian; Chen Hailong; Zhang Qiaobao; Zhu Ting; Yang Yong;

  • 作者单位

    Xiamen Univ Xiamen, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat,Dept Chem, Xiamen 361005, Peoples R China;

    Xiamen Univ Xiamen, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat,Dept Chem, Xiamen 361005, Peoples R China;

    Xiamen Univ Xiamen, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat,Dept Chem, Xiamen 361005, Peoples R China;

    Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA;

    North Carolina State Univ, Dept Mat Sci Engn, Raleigh, NC 27695 USA;

    Xiamen Univ, Semicond Photon Res Ctr, Dept Phys, Coll Phys Sci & Technol, Xiamen 361005, Peoples R China;

    Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China;

    Xiamen Univ Xiamen, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat,Dept Chem, Xiamen 361005, Peoples R China;

    Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA;

    Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China;

    Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA;

    Xiamen Univ Xiamen, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat,Dept Chem, Xiamen 361005, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    lithium-ion batteries; nanoparticles; silicon-based composite anodes; solid electrolyte interfaces; surface oxide;

    机译：锂离子电池;纳米粒子;硅基复合阳极;固体电解质界面;表面氧化物;

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