Experimental Evaluation of Influence of Stress on Li Chemical Potential and Phase Equilibrium in Two-phase Battery Electrode Materials
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- KIMURA Yuta
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- FUNAYAMA Keita
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- FAKKAO Mahunnop
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- NAKAMURA Takashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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- KUWATA Naoaki
- National Institute of Materials Science
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- KAWADA Tatsuya
- Graduate School of Environmental Studies, Tohoku University
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- KAWAMURA Junichi
- Research Administration Center, Tohoku University
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- AMEZAWA Koji
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
Abstract
<p>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.</p>
Journal
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- Electrochemistry
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Electrochemistry 89 (4), 355-362, 2021-07-05
The Electrochemical Society of Japan
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Details 詳細情報について
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- CRID
- 1390007128168211968
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- NII Article ID
- 130008062338
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- ISSN
- 21862451
- 13443542
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Allowed