Lithium insertion into chemically etched multi-walled carbon nanotubes

摘要

Lithium insertion (deinsertion) into (from) chemically etched multi-walled carbon nanotubes (c-MWNTs) has been investigated using various electrochemical techniques such as chronopotentiometry,chronoamperometry,and electrochemical impedance spectroscopy.The results indicate that not only the reversible capacity but also the rate capability was improved by a chemical etching (shortening) of the nanotubes.The observed enhancement in capability at high-rate lithium insertion/deinsertion is attributed to the increased electrochemically active area and reduced lithium diffusion length along the nanotubes,resulting from the structural defects and open ends of the c-MWNTs.