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11B NMR of boron-doped graphite as the negative electrode of a lithium secondary battery

Title
11B NMR of boron-doped graphite as the negative electrode of a lithium secondary battery
Authors
Lee Y.Han D.-Y.Lee D.Woo A.J.Lee S.H.Kim Y.K.
Ewha Authors
우애자
SCOPUS Author ID
우애자scopus
Issue Date
2002
Journal Title
Carbon
ISSN
0008-6223JCR Link
Citation
vol. 40, no. 3, pp. 403 - 408
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Boron-doped graphite used as a negative electrode for a lithium rechargeable battery is known to have higher discharge capacity than undoped graphite. Herein, the graphites were mixed with 1, 2.5, 5, and 7 wt.% of boron carbide during the graphitizing process. The structural states of boron in those boron-doped graphites were successfully identified by solid-state 11B NMR spectroscopy. For 1 wt.% sample, all boron atoms were at substitutional sites, as evident by the second-order quadrupole broadened 11B NMR line having a quadrupole coupling constant, QCC=3.36(2) MHz. The NMR results show evidence of excess boron atoms recrystallizing as boron carbide during the graphitizing process which is in agreement with XRD data. Agreement of experimental results with computer simulated data indicate that the substitutional sites in boron-doped graphites were observed for the first time. © 2002 Elsevier Science Ltd. All rights reserved.
DOI
10.1016/S0008-6223(01)00120-8
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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