3-Aminopropyltriethoxysilane-Assisted Si@SiO₂/CNTs Hybrid Microspheres as Superior Anode Materials for Li-ion Batteries

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• 作者：Jiyun Wang ; Xianhua Hou ; Miao Zhang ; Yana Li ; Yuping Wu ; Xiang Liu ; Shejun Hu
• 关键词：Silicon ; Composites ; Electronic materials ; Li ; ion batteries
• 刊名：SILICON
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：9
• 期：1
• 页码：97-104
• 全文大小：1,929 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Materials Science
  Organic Chemistry
  Polymer Sciences
  Biomedical Engineering
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1876-9918
• 卷排序：9

文摘

A silicon based composite (Si@SiO₂/CNTs) with outstanding electrochemistry performance has been easily synthesized using a spray drying method; The composite microsphere is mainly made up of carbon nanotubes and the prepared nano silicon particles. With the help of a silane coupling agent, carbon nanotubes tightly intertwined with nano silicon particles and formed microspheres together. On the surface of the prepared nano silicon particles, a layer of oxide film plays a role as a barrier to reduce the rupture of the particles during the lithium intercalation/extraction process. In addition, the added twisted carbon nanotubes can help to maintain the conductive network, thus stabilizing the electrode working environment during the lithium intercalation/extraction process. As a superior anode material, an initial specific discharge capacity of approximately 2846.9 mAh g−1 with a coulombic efficiency of 86 % and a reversible specific capacity of 2035.9 mAh g−1 after 100 cycles at a constant density of 500 mA g−1 are obtained.