Issue 39, 2014

Chemical bonding in amorphous Si-coated carbon nanotubes as anodes for Li ion batteries: a XANES study

Abstract

The nature of the chemical bonding in an amorphous Si-coated carbon nanotube (Si-CNT) anode, and its evolution upon electrochemical cycling, have been investigated using comprehensive X-ray absorption spectroscopy (XANES) at the Si L- and K-edges, along with the C and O K-edges. The Si nanolayer on the CNT is found to be anchored to the CNT via Si–O–C bonding. This bond weakens upon electrochemical cycling, accompanied by the generation of Li2CO3 on the surface of the Si-CNT. These findings are crucial in designing further improved Si–C composite anodes for lithium ion batteries.

Graphical abstract: Chemical bonding in amorphous Si-coated carbon nanotubes as anodes for Li ion batteries: a XANES study

Supplementary files

Article information

Article type
Communication
Submitted
14 2 2014
Accepted
10 3 2014
First published
11 3 2014

RSC Adv., 2014,4, 20226-20229

Author version available

Chemical bonding in amorphous Si-coated carbon nanotubes as anodes for Li ion batteries: a XANES study

J. Zhou, Y. Hu, X. Li, C. Wang and L. Zuin, RSC Adv., 2014, 4, 20226 DOI: 10.1039/C4RA01332H

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