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Raman study on electrochemical lithium insertion into multiwalled carbon nanotubes
Author(s) -
Kim Yoong Ahm,
Kojima Masashito,
Muramatsu Hiroyuki,
Shimamoto Daisuke,
Hayashi Takuya,
Endo Morinobu,
Terrones Mauricio,
Dresselhaus Mildred S.
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1961
Subject(s) - raman spectroscopy , lithium (medication) , intercalation (chemistry) , graphite , electrochemistry , materials science , carbon nanotube , carbon fibers , phase (matter) , ion , analytical chemistry (journal) , nanotechnology , electrode , chemistry , inorganic chemistry , composite material , composite number , organic chemistry , medicine , physics , optics , endocrinology
We have carried out in situ Raman studies during the electrochemical insertion of lithium ions (Li + ) into pristine and thermally treated multiwalled carbon nanotubes (MWNTs). We found an improved structural integrity as well as the removal of defects in the thermally treated tubes. The different Li + insertion behaviors above 0.5 V in as‐grown and thermally treated tubes could be explained by the presence of defects on the outer surface of the tubes. No change of Raman spectra from 2.8 to 0.8 V is characterized by the coverage of Li + on the outer surface of tubes, whereas the upshift of G band and the absence of a separated G band below 0.75 V indicate the formation of diluted graphite intercalation below the stage‐2 phase (LiC 12 ). Copyright © 2008 John Wiley & Sons, Ltd.
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