Nano-tube-like surface structure in graphite particles and its formation mechanism: A role in anodes of lithium-ion secondary batteries

K. Moriguchi*, S. Munetoh, M. Abe, M. Yonemura, K. Kamei, A. Shintani, Y. Maehara, A. Omaru, M. Nagamine

*この研究の対応する著者

研究成果: Article査読

37 被引用数 (Scopus)

抄録

Nano-structures on the surface of graphite based carbon particles have been investigated by means of high resolution transmission electron microscopy. The surfaces consist of "closed-edge" structures in a similar manner as carbon nano-tube. That is, they are composed of coaxial carbon tubes consisting of adequate coupling of graphite layer edges. These graphite particles are chemically stable and, therefore, applicable for lithium-ion secondary battery anodes. Molecular dynamics simulations based on the Tersoff potential reveal that the vibrations of the graphite layers at the free edges play an important role in the formation of the closed-edge structures. In lithium-ion secondary batteries, Li ions can intrude into bulk carbon anodes through these closed-edge structures. In order to clarify this intrusion mechanism, we have studied the barrier potentials of Li intrusion through these closed edges using the first-principles cluster calculations. From electrochemical measurements, the carbon anodes composed of these closed-edge structures show actually high battery performance with a large discharge capacity and a small irreversible capacity. This article also implies that we can control these surface structures by choosing some suitable heat treatment conditions and/or pulverization conditions before the final heat treatment process.

本文言語English
ページ(範囲)6369-6377
ページ数9
ジャーナルJournal of Applied Physics
88
11
出版ステータスPublished - 2000 12
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理学および天文学(その他)

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