Particle-size effects on the entropy behavior of a LixFePO 4 electrode

Kazuhiko Kai, Yo Kobayashi, Hajime Miyashiro, Gosuke Oyama, Shin Ichi Nishimura, Masashi Okubo, Atsuo Yamada*

*この研究の対応する著者

研究成果: Article査読

18 被引用数 (Scopus)

抄録

The particle-size effects on the thermodynamic properties and kinetic behavior of a LixFePO4 electrode have a direct influence on the electrode properties. Thus, the development of high-performance Li-ion batteries containing a LixFePO4 cathode requires a complete understanding of the reaction mechanism at the atomic/nano/meso scale. In this work, we report electrochemical calorimetric and potentiometric studies on LixFePO4 electrodes with different particle sizes and clarify the particle-size effect on the reaction mechanism based on the entropy change of (de)lithiation. Electrochemical calorimetry results show that a reduction in particle size shrinks the miscibility gap of Li xFePO4 while potentiometric measurements demonstrate that the LixFePO4 particles equilibrate into either a kinetically metastable state or a thermodynamically stable state depending on the particle size.

本文言語English
ページ(範囲)2156-2161
ページ数6
ジャーナルChemPhysChem
15
10
DOI
出版ステータスPublished - 2014 7 21
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 物理化学および理論化学

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