Experimental evaluation of influence of stress on li chemical potential and phase equilibrium in two-phase battery electrode materials

Yuta Kimura, Keita Funayama, Mahunnop Fakkao, Takashi Nakamura, Naoaki Kuwata, Tatsuya Kawada, Junichi Kawamura, Koji Amezawa

研究成果: Article査読

抄録

We experimentally evaluated the influence of stress on the Li chemical potential (μLi) and phase equilibrium in the two-phase battery electrode materials through the emf measurements while applying a mechanical load. In our measurements, we prepared an electrochemical cell by depositing a thin film of a two-phase electrode material (LiFePO4 or LiCoO2 in the two-phase region) on each of the solid electrolyte surfaces. Then we applied a mechanical load to the electrochemical cell through four-point bending, and the resulting μLi variation in the electrode material was measured as the emf between the two thin films. Our results indicated that μLi in the two-phase electrode materials immediately changed just after loading and then gradually changed while maintaining a constant mechanical load. Besides, the loading and unloading led to the μLi variation in the opposite direction. Such characteristic μLi variations could be explained by considering the change in the phase equilibrium between the two phases, which led to the Li content variation in the two phases and the stress relaxation due to the volume fraction variation of the two phases. Our results can provide valuable insights regarding the influence of stress on the performances of energy storage devices with two-phase electrode materials.

本文言語English
ページ(範囲)355-362
ページ数8
ジャーナルElectrochemistry
89
4
DOI
出版ステータスPublished - 2021
外部発表はい

ASJC Scopus subject areas

  • 電気化学

フィンガープリント

「Experimental evaluation of influence of stress on li chemical potential and phase equilibrium in two-phase battery electrode materials」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル