The chemical bonding nature and its evolution upon electrochemical cycling in amorphous Si coated-carbon nanotube (Si-CNT) anode has been investigated using comprehensive X-ray absorption spectroscopy (XANES) at Si L- and K-edges along with C and O K-edges. The Si nanolayer on CNT is found to be anchored to CNT via Si-O-C bonding. This bond weakens upon electrochemical cycling accompanied with generation of Li2CO3 on the surface of Si-CNT. Those findings are crucial in designing further improved Si-C composite anode for lithium ion battery.
Revised: May 21, 2014 |
Published: March 11, 2014
Citation
Zhou J., Y. Hu, X. Li, C.M. Wang, and L. Zuin. 2014.Chemical Bonding In Amorphous Si Coated-carbon Nanotube As Anodes For Li ion Batteries: A XANES Study.RSC Advances 4, no. 39:20226-20229.PNNL-SA-101008.doi:10.1039/c4ra01332h