Article Title

Coaxial Si/anodic titanium oxide/Si nanotube arrays for lithium-ion battery anodes

Authors

Jiepeng Rong, Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
Xin Fang, Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
Mingyuan Ge, Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
Haitian Chen, Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA
Jing Xu, Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
Chongwu Zhou, Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA

Keywords

lithium ion battery, anodic titanium oxide, silicon anode

Abstract

Silicon (Si) has the highest known theoretical specific capacity (3,590 mAh/g for Li15Si4, and 4,200 mAh/g for Li22Si4) as a lithium-ion battery anode, and has attracted extensive interest in the past few years. However, its application is limited by poor cyclability and early capacity fading due to significant volume changes during lithiation and delithiation processes. In this work, we report a coaxial silicon/anodic titanium oxide/silicon (Si–ATO–Si) nanotube array structure grown on a titanium substrate demonstrating excellent electrochemical cyclability. The ATO nanotube scaffold used for Si deposition has many desirable features, such as a rough surface for enhanced Si adhesion, and direct contact with the Ti substrate working as current collector. More importantly, our ATO scaffold provides a rather unique advantage in that Si can be loaded on both the inner and outer surfaces, and an inner pore can be retained to provide room for Si volume expansion. This coaxial structure shows a capacity above 1,500 mAh/g after 100 cycles, with less than 0.05% decay per cycle. Simulations show that this improved performance can be attributed to the lower stress induced on Si layers upon lithiation/delithiation compared with some other recently reported Si-based nanostructures.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-013-0294-x

Publisher

Tsinghua University Press

Recommended Citation

Jiepeng Rong,Xin Fang,Mingyuan Ge,Haitian Chen,Jing Xu,Chongwu Zhou, Coaxial Si/anodic titanium oxide/Si nanotube arrays for lithium-ion battery anodes. NanoRes.2013, 6(3): 182–190