Determination of activation energy for Li ion diffusion in electrodes

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

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2840-2847
Number of pages8
JournalJournal of Physical Chemistry B
Volume113
Issue number9
DOIs
Publication statusPublished - 2009 Mar 5
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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