Silicon-Encapsulated Hollow Carbon Nanofiber Networks as Binder-Free Anodes for Lithium Ion Battery

• Main Authors: Ding Nan, Zheng-Hong Huang, Ruitao Lv, Yuxiao Lin, Lu Yang, Xiaoliang Yu, Ling Ye, Wanci Shen, Hongyu Sun, Feiyu Kang
• Format: Article
• Language: English
• Published: Hindawi Limited 2014-01-01
• Series: Journal of Nanomaterials
• Online Access: http://dx.doi.org/10.1155/2014/139639
• ISSN: 1687-4110; 1687-4129

Silicon-encapsulated hollow carbon nanofiber networks with ample space around the Si nanoparticles (hollow Si/C composites) were successfully synthesized by dip-coating phenolic resin onto the surface of electrospun Si/PVA nanofibers along with the subsequent solidification and carbonization. More importantly, the structure and Si content of hollow Si/C composite nanofibers can be effectively tuned by merely varying the concentration of dip solution. As-synthesized hollow Si/C composites show excellent electrochemical performance when they are used as binder-free anodes for Li-ion batteries (LIBs). In particular, when the concentration of resol/ethanol solution is 3.0%, the product exhibits a large capacity of 841 mAh g−1 in the first cycle, prominent cycling stability, and good rate capability. The discharge capacity retention of it was ~90%, with 745 mAh g−1 after 50 cycles. The results demonstrate that the hollow Si/C composites are very promising as alternative anode candidates for high-performance LIBs.