Electrospun SnO₂-Graphene Composite Nanofibers as High Performance Anode for Lithium Ion Batteries

Abstract:

A promising anode material for lithium ion batteries is reported in this paper. It is one-dimensional SnO₂−graphene composite nanofibers (SnO₂−G nanofibers) fabricated by using electrospinning technique. In the study, X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to characterize its structural and morphological properties. Samples with different ratio of SnO₂ to graphene (wt%) are prepared to investigate its electrochemical performance. Galvanostatic charge/discharge tests reveals that Li-insertion/extraction is carried out through a two-phase reaction mechanism that is supported by galvanostatic charge−discharge profiles. It is found that the optimal proportion of SnO₂ to graphene is 8:1 (wt%) for the electrospun composite materials. Furthermore, micro thin film batteries have been fabricated and tested. The results show that initial discharge capacity is 301.86 mA h g⁻¹ at current density of 50 μA g⁻¹, and battery can retain 63.3% of reversible capacity after 300 cycles, which is 5 times higher than bare SnO₂.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 1207-1213
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.1207
• Online since: May 2015
• Authors: Yu Ling Wu, Jie Lin, Jian Yan Wang, Hang Guo*
• Keywords: Electrospinning, Graphene, SnO₂

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