能源化学(英文) ›› 2014, Vol. 23 ›› Issue (3): 291-300.DOI: 10.1016/S2095-4956(14)60150-9

• ARTICLES • 上一篇    下一篇

High-performance self-organized Si nanocomposite anode for lithium-ion batteries

Xiuyun Zhaoa, Dingguo Xiaa, Lin Gub, Juncheng Yuea, Biao Lia, Hang Weia, Huijun Yana, Ruqiang Zoua, Yingxia Wangc, Xiayan Wangd, Ze Zhange, Jixue Lie   

  1. a. College of Engineering, Peking University, Beijing 100871, China;
    b. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences, Beijing 100190, China;
    c. College of Chemistry and Molecular, Peking University, Beijing 100871, China;
    d. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;
    e. Center of Electron Microscopy, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • 收稿日期:2013-11-29 修回日期:2014-01-06 出版日期:2014-05-24 发布日期:2014-05-25
  • 通讯作者: Dingguo Xia, Jixue Li
  • 基金资助:

    This work was supported by the Major Program of Beijing Municipal Natural Science Foundation (No. 2110001), the National Natural Science Foundation of China (No. 11179001) and the National High Technology Research and Development Program (No. 2012AA052201).

High-performance self-organized Si nanocomposite anode for lithium-ion batteries

Xiuyun Zhaoa, Dingguo Xiaa, Lin Gub, Juncheng Yuea, Biao Lia, Hang Weia, Huijun Yana, Ruqiang Zoua, Yingxia Wangc, Xiayan Wangd, Ze Zhange, Jixue Lie   

  1. a. College of Engineering, Peking University, Beijing 100871, China;
    b. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences, Beijing 100190, China;
    c. College of Chemistry and Molecular, Peking University, Beijing 100871, China;
    d. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;
    e. Center of Electron Microscopy, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2013-11-29 Revised:2014-01-06 Online:2014-05-24 Published:2014-05-25
  • Supported by:

    This work was supported by the Major Program of Beijing Municipal Natural Science Foundation (No. 2110001), the National Natural Science Foundation of China (No. 11179001) and the National High Technology Research and Development Program (No. 2012AA052201).

摘要: Silicon is being investigated extensively as an anodic material for next-generation lithium ion batteries for portable energy storage and electric vehicles. However, the large changes in volume during cycling lead to the breakdown of the conductive network in Si anodes and the formation of an unstable solid-electrolyte interface, resulting in capacity fading. Here, we demonstrate nanoparticles with a Si@Mn22.6Si5.4C4@C double-shell structure and the formation of self-organized Si-Mn-C nanocomposite anodes during the lithiation/delithiation process. The anode consists of amorphous Si particles less than 10 nm in diameter and separated by an interconnected conductive/buffer network, which exhibits excellent charge transfer kinetics and charge/discharge performances. A stable specific capacity of 1100 mAh·g-1 at 100 mA·g-1 and a coulombic efficiency of 99.2% after 30 cycles are achieved. Additionally, a rate capacity of 343 mAh·g-1 and a coulombic efficiency of 99.4% at 12000 mA·g-1 are also attainable. Owing to its simplicity and applicability, this strategy for improving electrode performance paves a way for the development of high-performance Si-based anodic materials for lithium ion batteries.

关键词: cycling performance, self-organized, Si nanocomposite anode, lithium ion batteries

Abstract: Silicon is being investigated extensively as an anodic material for next-generation lithium ion batteries for portable energy storage and electric vehicles. However, the large changes in volume during cycling lead to the breakdown of the conductive network in Si anodes and the formation of an unstable solid-electrolyte interface, resulting in capacity fading. Here, we demonstrate nanoparticles with a Si@Mn22.6Si5.4C4@C double-shell structure and the formation of self-organized Si-Mn-C nanocomposite anodes during the lithiation/delithiation process. The anode consists of amorphous Si particles less than 10 nm in diameter and separated by an interconnected conductive/buffer network, which exhibits excellent charge transfer kinetics and charge/discharge performances. A stable specific capacity of 1100 mAh·g-1 at 100 mA·g-1 and a coulombic efficiency of 99.2% after 30 cycles are achieved. Additionally, a rate capacity of 343 mAh·g-1 and a coulombic efficiency of 99.4% at 12000 mA·g-1 are also attainable. Owing to its simplicity and applicability, this strategy for improving electrode performance paves a way for the development of high-performance Si-based anodic materials for lithium ion batteries.

Key words: cycling performance, self-organized, Si nanocomposite anode, lithium ion batteries