Determination of activation energy for Li ion diffusion in electrodes

Masashi Okubo, Yoshinori Tanaka, Haoshen Zhou, Tetsuichi Kudo, Itaru Honma*

*この研究の対応する著者

研究成果: Article査読

63 被引用数 (Scopus)

抄録

Higher power Li ion rechargeable batteries are important in many practical applications. Higher power output requires faster charge transfer reactions in the charge/discharge process. Because lower activation energy directly correlates to faster Li ion diffusion, the activation energy for ionic diffusion throughout the electrode materials is of primary importance. In this study, we demonstrate a simple, versatile electrochemical method to determine the activation energy for ionic diffusion in electrode materials via temperature dependent capacitometry. A generalized form of the temperature dependence of the discharge capacity was derived from the diffusion equation. This method yielded activation energy values for Li ion diffusion in LiCoO2 comparable to those obtained from ab initio calculations.

本文言語English
ページ(範囲)2840-2847
ページ数8
ジャーナルJournal of Physical Chemistry B
113
9
DOI
出版ステータスPublished - 2009 3月 5
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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