Electrochemical Insertion/extraction of Lithium in Multiwall Carbon Nanotube/Sb and SnSb₀.₅ Nanocomposites
Author(s)Chen, Wei Xiang; Lee, Jim Yang; Liu, Zhaolin
Multiwall carbon nanotubes (CNTs) were synthesized by catalytic chemical vapor deposition of acetylene and used as templates to prepare CNT-Sb and CNT-SnSb₀.₅ nanocomposites via the chemical reduction of SnCl₂ and SbCl₃ precursors. SEM and TEM imagings show that the Sb and SnSb₀.₅ particles were uniformly dispersed in the CNT web and on the outside surface of CNTs. These CNT-metal composites are active anode materials for lithium ion batteries, showing improved cyclability compared to unsupported Sb and SnSb particles; and higher reversible specific capacities than CNTs. The improvement in cyclability may be attributed to the nanoscale dimensions of the metal particles and CNT’s role as a buffer in containing the mechanical stress arising from the volume changes in electrochemical lithium insertion and extraction reactions.
Molecular Engineering of Biological and Chemical Systems (MEBCS);
carbon nanotubes, SnSb alloy, composite, anode materials, Li-ion batteries