Abstract
Stacked-cup type multiwall carbon nanotubes (MWCNTs) were synthesized by floating catalyst chemical vapor deposition methods. The materials were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Electrochemical measurements showed that the stacked-cup-type MWCNTs as lithium-ion battery anode materials delivered a stable capacity of ~310 mAh g-1 at a rate of C/2 to 300 cycles. Furthermore, the materials were very stable and the coulombic efficiency exceeded 99.9 % over more than 300 cycles. Stable materials structure and the solid electrolyte interphase films were the main reasons for the durable cycling behavior, as confirmed by ex situ TEM and Raman spectroscopy, as well as electrochemical impedance spectroscopy (EIS). The results indicated that the stacked-cup-type MWCNTs produced in this work are candidate materials for lithium-ion battery anodes.
| Original language | English |
|---|---|
| Pages (from-to) | 179-187 |
| Number of pages | 9 |
| Journal | Journal of Applied Electrochemistry |
| Volume | 44 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2014 |
Bibliographical note
Funding Information:Acknowledgments J.C.L. and Y.T.C. are grateful to financial support from NSF (CMMI #1000726) and General Motors. M.S.M. and A.P.K. wish to thank Dali Qian and Center for Applied Energy Research, University of Kentucky for producing starting CNTs and to thank Dr. Per Askeland and Dr. Doo Young Kim for XPS analysis.
Keywords
- Anode (negative electrode)
- Electrochemical impedance spectroscopy (EIS)
- Lithium-ion battery
- Multiwall carbon nanotubes (MWCNTs)
ASJC Scopus subject areas
- General Chemical Engineering
- Electrochemistry
- Materials Chemistry
