Properties of a novel hard-carbon optimized to large size Li ion secondary battery studied by 7Li NMR

Kazuma Gotoh, Mariko Maeda, Aisaku Nagai, Atsushi Goto, Masataka Tansho, Kenjiro Hashi, Tadashi Shimizu, Hiroyuki Ishida

研究成果査読

72 被引用数 (Scopus)

抄録

The state of lithium in a novel hard-carbon optimized to the anode of large size Li ion secondary battery, which has been recently commercialized, was investigated and compared with other existing hard-carbon samples by 7Li NMR method. The new carbon material showed a peak at 85 ppm with a shoulder signal at 7 ppm at room temperature in static NMR spectrum, and the former shifted to 210 ppm at 180 K. The latter at room temperature was attributed to Li doped in small particles contained in the sample. The new carbon sample showed weaker intensity of cluster-lithium signal than the other hard-carbon samples in NMR, which corresponded to a tendency of less "constant voltage" (CV) capacity in charge-discharge curves of electrochemical evaluation. Smaller CV capacity and initial irreversible capacity, which are the features of the novel hard-carbon, are considered to correspond to a blockade of the diffusion of Li into pore of carbon.

本文言語English
ページ(範囲)1322-1328
ページ数7
ジャーナルJournal of Power Sources
162
2 SPEC. ISS.
DOI
出版ステータスPublished - 11月 22 2006
外部発表はい

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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