Flexible binder-free silicon/silica/carbon nanofiber composites as anode for lithium–ion batteries. (1st July 2015)

• Record Type: Journal Article
• Authors: Dirican, Mahmut; Yildiz, Ozkan; Lu, Yao; Fang, Xiaomeng; Jiang, Han; Kizil, Huseyin; Zhang, Xiangwu
• Is Part Of: Electrochimica acta. Volume 169(2015)
• Page Start: 52
• Page End: 60
• Publication Date: 2015-07-01
• Subjects: Lithium–ion battery -- Flexible electrode -- Carbon nanofiber -- Silicon -- Chemical vapor deposition; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.04.035
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Flexible Si/SiO2 /C composite nanofibers were introduced as Li–ion battery anodes. SiO2 component of composite nanofibers facilitated the high flexibility. Flexible Si/SiO2 /C composite nanofibers were coated with CVD-carbon. CVD carbon coating and SiO2 component led to high capacity retention. Abstract: High-capacity flexible electrode materials for high-energy lithium–ion batteries become critically important with technological improvements on portable and bendable electronic equipment such as rollup displays, implantable medical devices, active radio-frequency identification tags, and wearable devices. Although different types of bendable electrode materials have been introduced, it is very important to fabricate highly-flexible electrode materials with reasonable fabrication technique and high electrochemical performance similar to those of conventional high-capacity electrode materials. Herein, we introduced high-capacity, flexible Si/SiO2 /C nanofiber composite anode materials by simple electrospinning and subsequent heat treatment processes. To further improve the long-term cycling performance, additional nanoscale carbon coating of flexible Si/SiO2 /C nanofibers was performed by CVD technique. Electrochemical performance results showed that CVD carbon-coated flexible Si/SiO2 /C nanofiber composites exhibited high capacity retention of 86.7% and high coulombic efficiency of 96.7% at the 50th cycle. It is, therefore, demonstrated that CVD carbon-coated flexible Si/SiO2 /C nanofiber composites are promising anode material candidate for next-generation flexible and high-energy lithium–ion batteries.