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

Youngil Lee, Duk Young Han, Donghoon Lee, Ae Ja Woo, Sam-Hyeon Lee, Daeho Lee, Young Kyu Kim

Research output: Contribution to journalArticle

14 Citations (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.

Original languageEnglish
Pages (from-to)403-408
Number of pages6
JournalCarbon
Volume40
Issue number3
DOIs
Publication statusPublished - 2002 Mar 1

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Boron
Graphite
Secondary batteries
Lithium
Nuclear magnetic resonance
Electrodes
Boron carbide
Atoms
Nuclear magnetic resonance spectroscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Lee, Youngil ; Han, Duk Young ; Lee, Donghoon ; Woo, Ae Ja ; Lee, Sam-Hyeon ; Lee, Daeho ; Kim, Young Kyu. / 11B NMR of boron-doped graphite as the negative electrode of a lithium secondary battery. In: Carbon. 2002 ; Vol. 40, No. 3. pp. 403-408.
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11B NMR of boron-doped graphite as the negative electrode of a lithium secondary battery. / Lee, Youngil; Han, Duk Young; Lee, Donghoon; Woo, Ae Ja; Lee, Sam-Hyeon; Lee, Daeho; Kim, Young Kyu.

In: Carbon, Vol. 40, No. 3, 01.03.2002, p. 403-408.

Research output: Contribution to journalArticle

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AU - Lee, Youngil

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AB - 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.

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