Premium
Long‐Cycle Electrochemical Behavior of Multiwall Carbon Nanotubes Synthesized on Stainless Steel in Li Ion Batteries
Author(s) -
Masarapu Charan,
Subramanian Venkatachalam,
Zhu Hongwei,
Wei Bingqing
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200801242
Subject(s) - materials science , carbon nanotube , anode , electrochemistry , lithium (medication) , nanometre , ion , electrode , battery (electricity) , lithium ion battery , chemical engineering , foil method , diffusion , nanotechnology , carbon fibers , composite material , composite number , medicine , power (physics) , chemistry , physics , quantum mechanics , endocrinology , engineering , thermodynamics
Carbon nanotubes (CNTs) are considered to be excellent candidates for high performance electrode materials in Li ion batteries. The nanometer‐sized pore structures of CNTs can provide the hosting sites for storing large numbers of Li ions. A short diffusion distance for the Li ions may bring about a high discharge rate. The long‐cycle performance of aligned multiwalled carbon nanotubes (MWNTs) directly synthesized on stainless‐steel foil as an anode material in lithium battery is demonstrated. An increase in the specific capacity with an increase in the cycle number is observed. Starting at a value of 132 mA hg −1 in the first cycle at a current rate of 1 C, the specific capacity increased about 250% to a value of 460 mA hg −1 after 1 200 cycles. This is an unusual but a welcoming behavior for battery applications. It is found that the morphology of the MWNTs with structural and surface defects and the stainless‐steel substrate play an important role in enhancing the capacity during the cycling process.