High concentration nitrogen doped carbon nanotube anodes with superior Li+ storage performance for lithium rechargeable battery application

A floating catalyst chemical vapor deposition method has been developed to synthesize carbon nanotubes doped with a high concentration of nitrogen. Their electrochemical performance as anodes for lithium ion batteries (LIBs) in comparison to pristine carbon nanotubes (CNTs) has been investigated. X-ray photoelectron spectroscopy results indicated that the nitrogen content reaches as high as 16.4 at.%. Bamboo-like compartments were fabricated as shown by high resolution transmission electron microscopy. High concentration nitrogen doped carbon nanotubes (HN-CNTs) show approximately double reversible capacity of CNTs: 494 mAh g(-1) vs. 260 mAh g(-1), and present a much better rate capability than CNTs. The significantly superior electrochemical performance could be related to the high electrical conductivity and the larger number of defect sites in HN-CNTs for anodes of LIBs. (C) 2011 Elsevier B.V. All rights reserved.