Carbon fibers as three-dimensional current collectors for silicon/reduced graphene oxide lithium ion battery anodes with improved rate performance and cycle life. (2nd May 2018)

• Record Type: Journal Article
• Authors: Hsu, Chun-Han; Lin, Heng-Han; Liu, Yi-Hung; Lin, Hong-Ping
• Is Part Of: New journal of chemistry. Volume 42:Number 11(2018)
• Page Start: 9058
• Page End: 9064
• Publication Date: 2018-05-02
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj01137k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Carbon fibers as 3D current collectors for Si/r-GO lithium ion battery anodes with improved rate performance were achieved. Abstract : A lithium ion battery (LIB) anode is prepared consisting of silicon and a reduced graphene oxide (Si/r-GO) composite deposited on a three-dimensional (3D) carbon fiber (CF) current collector. The morphology, structure and textural properties of the as-prepared Si, Si/r-GO composite and Si/r-GO/CF electrode are characterized using scanning electron microscopy, X-ray diffraction and N2 adsorption–desorption isotherms, respectively. The reversible capacity of the Si/r-GO/CF electrode (>1000 mA h g −1 at the rate of 0.1C) is found to be significantly higher than that of a Si/r-GO electrode with a traditional 2D copper foil collector. Moreover, the Si/r-GO/CF electrode exhibits an excellent rate performance of 280 mA h g −1 even at a rate of 10C due to the effective conductivity improvement and a capacitor-like behavior offered by the CF networks. In addition, the Si/r-GO/CF coin cell shows a low resistance of 20 Ω in charge transfer. Finally, the CF skeleton serves as a solid scaffold, which inhibits the aggregation of the Si/r-GO composite during usage, and therefore leads to a long cycle life ( i.e., a capacity retention of more than 95% after 100 cycles).